Implicit include of checked header files (#440)

* Support for implicit and explicit inclusion of checked header files.

* Added comment header.

* Removed redundant blank lines.

* Fix to handle the presence of clang-specific declarations in header files plus
the fix to push/pop checked scopes.

* Modified header files to check for the __checkedc flag and added test cases.

* Some header files like threads.h, unistd.h, arpa/inet.h and sys/socket.h
may not be present in all compilation environments (Ex. Windows).
Therefore, the wrapper header files and the Checked C header files
should guard their inclusion using __has_include_next.
This will also cause changes in the expected output of some test cases.

* Incorporated review comments.

* The Checked-C-specific declarations in assert_checked.h, stdlib_checked.h
and inttypes_checked.h use the type wchar_t, whose definition is available
in stddef.h. The file inttypes_checked.h includes stddef.h but the other
two don't.

include/CMakeLists.txt

@@ -9,18 +9,30 @@
 
 set(files
   assert_checked.h
+  assert.h
   errno_checked.h
+  errno.h
   fenv_checked.h
+  fenv.h
   inttypes_checked.h
+  inttypes_checked_internal.h
   math_checked.h
+  math.h
   signal_checked.h
+  signal.h
   stdchecked.h
   stdio_checked.h
+  stdio.h
   stdlib_checked.h
+  stdlib.h
   string_checked.h
+  string.h
   threads_checked.h
+  threads.h
   time_checked.h
+  time.h
   unistd_checked.h
+  unistd.h
   _builtin_stdio_checked.h
   _builtin_string_checked.h
   _builtin_common.h
@@ -29,10 +41,12 @@ set(files
 
 set(posix_arpa_files
   arpa/inet_checked.h
+  arpa/inet.h
   )
 
 set(posix_sys_files
   sys/socket_checked.h
+  sys/socket.h
 )
 
 # Hack - compute the CLANG version from the LLVM version.  The

include/arpa/inet.h

@@ -0,0 +1,30 @@
+//---------------------------------------------------------------------//
+// Wrapper header file that excludes Checked-C-specific declarations   //
+// if the compilation is not for Checked C, or if is for Checked C     //
+// but the implicit inclusion of checked header files is disabled.     //
+/////////////////////////////////////////////////////////////////////////
+
+
+#if !defined __checkedc || defined NO_IMPLICIT_INCLUDE_CHECKED_HDRS
+
+// The Windows environment may not have arpa/inet.h
+#if defined __has_include_next
+#if __has_include_next(<arpa/inet.h>)
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include_next <arpa/inet.h>
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#endif // has inet.h
+#endif // defined __has_include_next
+
+#else // checkedc && implicit include enabled
+#include <arpa/inet_checked.h>
+#endif

include/arpa/inet_checked.h

@@ -5,28 +5,35 @@
 // These are POSIX-only                                                //
 /////////////////////////////////////////////////////////////////////////
 
-#ifndef __cplusplus
+// The Windows environment may not have arpa/inet.h
+#if defined __has_include_next
+#if __has_include_next(<arpa/inet.h>)
+
+#ifdef __checkedc
 #pragma CHECKED_SCOPE push
 #pragma CHECKED_SCOPE off
 #endif
 
-#include <arpa/inet.h>
+#include_next <arpa/inet.h>
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE pop
 #endif
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #ifndef __INET_CHECKED_H
 #define __INET_CHECKED_H
 
 #pragma CHECKED_SCOPE push
-#pragma CHECKED_SCOPE ON
+#pragma CHECKED_SCOPE on
 
 extern in_addr_t inet_addr (const char *__cp : itype(_Nt_array_ptr<const char>)) __THROW;
 
 
 #pragma CHECKED_SCOPE pop
 
-#endif
-#endif
+#endif // guard
+#endif // Checked C
+
+#endif // has inet.h
+#endif // defined __has_include_next

include/assert.h

@@ -0,0 +1,23 @@
+//---------------------------------------------------------------------//
+// Wrapper header file that excludes Checked-C-specific declarations   //
+// if the compilation is not for Checked C, or if is for Checked C     //
+// but the implicit inclusion of checked header files is disabled.     //
+/////////////////////////////////////////////////////////////////////////
+
+
+#if !defined __checkedc || defined NO_IMPLICIT_INCLUDE_CHECKED_HDRS
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include_next <assert.h>
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#else // checkedc && implicit include enabled
+#include <assert_checked.h>
+#endif

include/assert_checked.h

@@ -4,23 +4,24 @@
 //                                                                     //
 /////////////////////////////////////////////////////////////////////////
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE push
 #pragma CHECKED_SCOPE off
 #endif
 
-#include <assert.h>
+#include_next <assert.h>
+#include <stddef.h> // define wchar_t for wcstoimax and wcstoumax
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE pop
 #endif
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #ifndef __ASSERT_CHECKED_H
 #define __ASSERT_CHECKED_H
 
 #pragma CHECKED_SCOPE push
-#pragma CHECKED_SCOPE ON
+#pragma CHECKED_SCOPE on
 
 #if defined(_WIN32) || defined(_WIN64)
 _ACRTIMP void __cdecl _wassert(_In_z_ wchar_t const *_Message : itype(_Nt_array_ptr<const wchar_t>),
@@ -50,4 +51,4 @@ __THROW __attribute__ ((__noreturn__));
 #pragma CHECKED_SCOPE pop
 
 #endif  // guard
-#endif  // no c++
+#endif  // Checked C

include/checkedc_extensions.h

@@ -4,11 +4,16 @@
 // choose to use these over the default bounds-safe interfaces.             //
 //////////////////////////////////////////////////////////////////////////////
 
+#include <stdlib_checked.h>
+#include <string_checked.h>
+
+#ifdef __checkedc
+
 #ifndef __CHECKED_C_EXTENSIONS_H
 #define __CHECKED_C_EXTENSIONS_H
 
-#include <stdlib_checked.h>
-#include <string_checked.h>
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE on
 
 // default strncmp has a bounds-safe interface nt_array_ptr;
 // this option is for array_ptr
@@ -24,4 +29,7 @@ int snprintf_array_ptr(char * restrict s : itype(restrict _Array_ptr<char>) coun
                        const char * restrict format : itype(restrict _Nt_array_ptr<const char>),
                        ...);
 
-#endif /* __CHECKED_C_EXTENSIONS_H */
+#pragma CHECKED_SCOPE pop
+
+#endif // guard 
+#endif // Checked C 

include/errno.h

@@ -0,0 +1,23 @@
+//---------------------------------------------------------------------//
+// Wrapper header file that excludes Checked-C-specific declarations   //
+// if the compilation is not for Checked C, or if is for Checked C     //
+// but the implicit inclusion of checked header files is disabled.     //
+/////////////////////////////////////////////////////////////////////////
+
+
+#if !defined __checkedc || defined NO_IMPLICIT_INCLUDE_CHECKED_HDRS
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include_next <errno.h>
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#else // checkedc && implicit include enabled
+#include <errno_checked.h>
+#endif

include/errno_checked.h

@@ -3,23 +3,23 @@
 //                                                                    //
 ////////////////////////////////////////////////////////////////////////
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE push
 #pragma CHECKED_SCOPE off
 #endif
 
-#include <errno.h>
+#include_next <errno.h>
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE pop
 #endif
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #ifndef __ERRNO_CHECKED_H
 #define __ERRNO_CHECKED_H
 
 #pragma CHECKED_SCOPE push
-#pragma CHECKED_SCOPE ON
+#pragma CHECKED_SCOPE on
 
 #if defined(_WIN32) || defined(_WIN64)
 __declspec(dllimport) int* __cdecl _errno(void) : itype(_Ptr<int>);
@@ -32,4 +32,4 @@ extern int* __errno_location(void) : itype(_Ptr<int>) __THROW __attribute_const_
 #pragma CHECKED_SCOPE pop
 
 #endif // guards
-#endif // c++
+#endif // Checked C

include/fenv.h

@@ -0,0 +1,23 @@
+//---------------------------------------------------------------------//
+// Wrapper header file that excludes Checked-C-specific declarations   //
+// if the compilation is not for Checked C, or if is for Checked C     //
+// but the implicit inclusion of checked header files is disabled.     //
+/////////////////////////////////////////////////////////////////////////
+
+
+#if !defined __checkedc || defined NO_IMPLICIT_INCLUDE_CHECKED_HDRS
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include_next <fenv.h>
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#else // checkedc && implicit include enabled
+#include <fenv_checked.h>
+#endif

include/fenv_checked.h

@@ -6,23 +6,23 @@
 // specification.                                                     //
 ////////////////////////////////////////////////////////////////////////
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE push
 #pragma CHECKED_SCOPE off
 #endif
 
-#include <fenv.h>
+#include_next <fenv.h>
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE pop
 #endif
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #ifndef __FENV_CHECKED_H
 #define __FENV_CHECKED_H
 
 #pragma CHECKED_SCOPE push
-#pragma CHECKED_SCOPE ON
+#pragma CHECKED_SCOPE on
 
 int fesetexceptflag(const fexcept_t *flagp : itype(_Ptr<const fexcept_t>),
                     int excepts);
@@ -33,5 +33,5 @@ int feupdateenv(const fenv_t *envp : itype(_Ptr<const fenv_t>));
 
 #pragma CHECKED_SCOPE pop
 
-#endif
-#endif
+#endif // guard
+#endif // Checked C

include/inttypes_checked.h

@@ -1,58 +1,11 @@
 //---------------------------------------------------------------------//
-// Bounds-safe interfaces for functions in inttypes.h that             //
-// take pointer arguments.                                             //
-//                                                                     //
-// These are listed in the same order that they occur in the C11       //
-// specification.                                                      //
+// Wrapper header file that includes Checked-C-specific declarations   //
+// explicitly.                                                         //
 /////////////////////////////////////////////////////////////////////////
 
-#ifndef __cplusplus
-#pragma CHECKED_SCOPE push
-#pragma CHECKED_SCOPE off
-#endif
 
-#include <stddef.h> // define wchar_t for wcstoimax and wcstoumax
+// Ensure that clang-specific declarations are included.
 #include <inttypes.h>
-
-#ifndef __cplusplus
-#pragma CHECKED_SCOPE pop
-#endif
-
-#ifndef __cplusplus
-#ifndef __INTTYPES_CHECKED_H
-#define __INTTYPES_CHECKED_H
-
-#pragma CHECKED_SCOPE push
-#pragma CHECKED_SCOPE ON
-
-_Unchecked
-intmax_t strtoimax(const char * restrict nptr :
-                     itype(restrict _Nt_array_ptr<const char>),
-                   char ** restrict endptr :
-                      itype(restrict _Ptr<_Nt_array_ptr<char>>),
-                   int base);
-_Unchecked
-uintmax_t strtoumax(const char * restrict nptr :
-                      itype(restrict _Nt_array_ptr<const char>),
-                    char ** restrict endptr :
-                      itype(restrict _Ptr<_Nt_array_ptr<char >>),
-                    int base);
-
-_Unchecked
-intmax_t wcstoimax(const wchar_t * restrict nptr :
-                     itype(restrict _Nt_array_ptr<const wchar_t>),
-                   wchar_t ** restrict endptr :
-                     itype(restrict _Ptr<_Nt_array_ptr<wchar_t>>),
-                   int base);
-
-_Unchecked
-uintmax_t wcstoumax(const wchar_t * restrict nptr :
-                      itype(restrict _Nt_array_ptr<const wchar_t>),
-                    wchar_t ** restrict endptr :
-                      itype(restrict _Ptr<_Nt_array_ptr<wchar_t>>),
-                    int base);
-
-#pragma CHECKED_SCOPE pop
-
-#endif // guard
-#endif // no c++
+// Ensure that Checked-C-specific declarations are included even if
+// implicit inclusion is disabled.
+#include <inttypes_checked_internal.h>

include/inttypes_checked_internal.h

@@ -0,0 +1,57 @@
+//---------------------------------------------------------------------//
+// Bounds-safe interfaces for functions in inttypes.h that             //
+// take pointer arguments.                                             //
+//                                                                     //
+// These are listed in the same order that they occur in the C11       //
+// specification.                                                      //
+/////////////////////////////////////////////////////////////////////////
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include <stddef.h> // define wchar_t for wcstoimax and wcstoumax
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#ifdef __checkedc
+#ifndef __INTTYPES_CHECKED_H
+#define __INTTYPES_CHECKED_H
+
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE on
+
+_Unchecked
+intmax_t strtoimax(const char * restrict nptr :
+                     itype(restrict _Nt_array_ptr<const char>),
+                   char ** restrict endptr :
+                      itype(restrict _Ptr<_Nt_array_ptr<char>>),
+                   int base);
+_Unchecked
+uintmax_t strtoumax(const char * restrict nptr :
+                      itype(restrict _Nt_array_ptr<const char>),
+                    char ** restrict endptr :
+                      itype(restrict _Ptr<_Nt_array_ptr<char >>),
+                    int base);
+
+_Unchecked
+intmax_t wcstoimax(const wchar_t * restrict nptr :
+                     itype(restrict _Nt_array_ptr<const wchar_t>),
+                   wchar_t ** restrict endptr :
+                     itype(restrict _Ptr<_Nt_array_ptr<wchar_t>>),
+                   int base);
+
+_Unchecked
+uintmax_t wcstoumax(const wchar_t * restrict nptr :
+                      itype(restrict _Nt_array_ptr<const wchar_t>),
+                    wchar_t ** restrict endptr :
+                      itype(restrict _Ptr<_Nt_array_ptr<wchar_t>>),
+                    int base);
+
+#pragma CHECKED_SCOPE pop
+
+#endif // guard
+#endif // Checked C

include/math.h

@@ -0,0 +1,23 @@
+//---------------------------------------------------------------------//
+// Wrapper header file that excludes Checked-C-specific declarations   //
+// if the compilation is not for Checked C, or if is for Checked C     //
+// but the implicit inclusion of checked header files is disabled.     //
+/////////////////////////////////////////////////////////////////////////
+
+
+#if !defined __checkedc || defined NO_IMPLICIT_INCLUDE_CHECKED_HDRS
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include_next <math.h>
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#else // checkedc && implicit include enabled
+#include <math_checked.h>
+#endif

include/math_checked.h

@@ -6,23 +6,23 @@
 // specification.                                                      //
 /////////////////////////////////////////////////////////////////////////
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE push
 #pragma CHECKED_SCOPE off
 #endif
 
-#include <math.h>
+#include_next <math.h>
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE pop
 #endif
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #ifndef __MATH_CHECKED_H
 #define __MATH_CHECKED_H
 
 #pragma CHECKED_SCOPE push
-#pragma CHECKED_SCOPE ON
+#pragma CHECKED_SCOPE on
 
 double frexp(double value, int *exp : itype(_Ptr<int>));
 float frexpf(float value, int *exp : itype(_Ptr<int>));
@@ -43,5 +43,5 @@ long double nanl(const char *t : itype(_Nt_array_ptr<const char>));
 
 #pragma CHECKED_SCOPE pop
 
-#endif //guard
-#endif // no c++
+#endif // guard
+#endif // Checked C

include/signal.h

@@ -0,0 +1,23 @@
+//---------------------------------------------------------------------//
+// Wrapper header file that excludes Checked-C-specific declarations   //
+// if the compilation is not for Checked C, or if is for Checked C     //
+// but the implicit inclusion of checked header files is disabled.     //
+/////////////////////////////////////////////////////////////////////////
+
+
+#if !defined __checkedc || defined NO_IMPLICIT_INCLUDE_CHECKED_HDRS
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include_next <signal.h>
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#else // checkedc && implicit include enabled
+#include <signal_checked.h>
+#endif

include/signal_checked.h

@@ -3,18 +3,18 @@
 // take pointer arguments.                                             //
 /////////////////////////////////////////////////////////////////////////
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE push
 #pragma CHECKED_SCOPE off
 #endif
 
-#include <signal.h>
+#include_next <signal.h>
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE pop
 #endif
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #ifndef __SIGNAL_CHECKED_H
 #define __SIGNAL_CHECKED_H
 
@@ -30,5 +30,5 @@ void (*signal(int sig,
 
 #pragma CHECKED_SCOPE pop
 
-#endif
-#endif
+#endif // guard
+#endif // Checked C

include/stdio.h

@@ -0,0 +1,23 @@
+//---------------------------------------------------------------------//
+// Wrapper header file that excludes Checked-C-specific declarations   //
+// if the compilation is not for Checked C, or if is for Checked C     //
+// but the implicit inclusion of checked header files is disabled.     //
+/////////////////////////////////////////////////////////////////////////
+
+
+#if !defined __checkedc || defined NO_IMPLICIT_INCLUDE_CHECKED_HDRS
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include_next <stdio.h>
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#else // checkedc && implicit include enabled
+#include <stdio_checked.h>
+#endif

include/stdio_checked.h

@@ -8,18 +8,18 @@
 // TODO: Better Support for _FORTIFY_SOURCE > 0                        //
 /////////////////////////////////////////////////////////////////////////
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE push
 #pragma CHECKED_SCOPE off
 #endif
 
-#include <stdio.h>
+#include_next <stdio.h>
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE pop
 #endif
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #ifndef __STDIO_CHECKED_H
 #define __STDIO_CHECKED_H
 
@@ -205,4 +205,4 @@ void perror(const char *s : itype(_Nt_array_ptr<const char>));
 #pragma CHECKED_SCOPE pop
 
 #endif // guard
-#endif // no C++
+#endif // Checked C

include/stdlib.h

@@ -0,0 +1,23 @@
+//---------------------------------------------------------------------//
+// Wrapper header file that excludes Checked-C-specific declarations   //
+// if the compilation is not for Checked C, or if is for Checked C     //
+// but the implicit inclusion of checked header files is disabled.     //
+/////////////////////////////////////////////////////////////////////////
+
+
+#if !defined __checkedc || defined NO_IMPLICIT_INCLUDE_CHECKED_HDRS
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include_next <stdlib.h>
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#else // checkedc && implicit include enabled
+#include <stdlib_checked.h>
+#endif

include/stdlib_checked.h

@@ -6,18 +6,19 @@
 // specification.                                                      //
 /////////////////////////////////////////////////////////////////////////
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE push
 #pragma CHECKED_SCOPE off
 #endif
 
-#include <stdlib.h>
+#include_next <stdlib.h>
+#include <stddef.h> // define wchar_t for wcstoimax and wcstoumax
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE pop
 #endif
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #ifndef __STDLIB_CHECKED_H
 #define __STDLIB_CHECKED_H
 
@@ -125,4 +126,4 @@ size_t wcstombs(char * restrict output : count(n),
 #pragma CHECKED_SCOPE pop
 
 #endif  // guard
-#endif  // no c++
+#endif  // Checked C

include/string.h

@@ -0,0 +1,23 @@
+//---------------------------------------------------------------------//
+// Wrapper header file that excludes Checked-C-specific declarations   //
+// if the compilation is not for Checked C, or if is for Checked C     //
+// but the implicit inclusion of checked header files is disabled.     //
+/////////////////////////////////////////////////////////////////////////
+
+
+#if !defined __checkedc || defined NO_IMPLICIT_INCLUDE_CHECKED_HDRS
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include_next <string.h>
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#else // checkedc && implicit include enabled
+#include <string_checked.h>
+#endif

include/string_checked.h

@@ -11,24 +11,24 @@
 // TODO: Better Support for _FORTIFY_SOURCE > 0                        //
 /////////////////////////////////////////////////////////////////////////
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE push
 #pragma CHECKED_SCOPE off
 #endif
 
-#include <string.h>
+#include_next <string.h>
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE pop
 #endif
 
-#ifndef __cplusplus
+#ifdef __checkedc
 
 #ifndef __STRING_CHECKED_H
 #define __STRING_CHECKED_H
 
 #pragma CHECKED_SCOPE push
-#pragma CHECKED_SCOPE ON
+#pragma CHECKED_SCOPE on
 
 // GCC has macros that it uses as part of its string implementation to optimize cases
 // where one or both strings are compile-time constants.  I'm not sure
@@ -173,4 +173,4 @@ char *strdup(const char *s : itype(_Nt_array_ptr<const char>)) : itype(_Nt_array
 #pragma CHECKED_SCOPE pop
 
 #endif // guard
-#endif // no C++
+#endif // Checked C 

include/sys/socket.h

@@ -0,0 +1,30 @@
+//---------------------------------------------------------------------//
+// Wrapper header file that excludes Checked-C-specific declarations   //
+// if the compilation is not for Checked C, or if is for Checked C     //
+// but the implicit inclusion of checked header files is disabled.     //
+/////////////////////////////////////////////////////////////////////////
+
+
+#if !defined __checkedc || defined NO_IMPLICIT_INCLUDE_CHECKED_HDRS
+
+// The Windows environment may not have sys/socket.h
+#if defined __has_include_next
+#if __has_include_next(<sys/socket.h>)
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include_next <sys/socket.h>
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#endif // has socket.h
+#endif // defined __has_include_next
+
+#else // checkedc && implicit include enabled
+#include <sys/socket_checked.h>
+#endif

include/sys/socket_checked.h

@@ -4,23 +4,27 @@
 //                                                                     //
 /////////////////////////////////////////////////////////////////////////
 
-#ifndef __cplusplus
+// The Windows environment may not have sys/socket.h
+#if defined __has_include_next
+#if __has_include_next(<sys/socket.h>)
+
+#ifdef __checkedc
 #pragma CHECKED_SCOPE push
 #pragma CHECKED_SCOPE off
 #endif
 
-#include <sys/socket.h>
+#include_next <sys/socket.h>
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE pop
 #endif
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #ifndef __SOCKET_CHECKED_H
 #define __SOCKET_CHECKED_H
 
 #pragma CHECKED_SCOPE push
-#pragma CHECKED_SCOPE ON
+#pragma CHECKED_SCOPE on
 
 #ifdef __APPLE__
 // Seems not to be a thing for Mac
@@ -134,4 +138,7 @@ extern int accept4 (
 #pragma CHECKED_SCOPE pop
 
 #endif // guard
-#endif // C++
+#endif // Checked C
+
+#endif // has socket.h
+#endif // defined __has_include_next

include/threads.h

@@ -0,0 +1,31 @@
+//---------------------------------------------------------------------//
+// Wrapper header file that excludes Checked-C-specific declarations   //
+// if the compilation is not for Checked C, or if is for Checked C     //
+// but the implicit inclusion of checked header files is disabled.     //
+/////////////////////////////////////////////////////////////////////////
+
+
+#if !defined __checkedc || defined NO_IMPLICIT_INCLUDE_CHECKED_HDRS
+
+// C implementations may not support the C11 threads package or even the
+// macro that says C11 threads are not supported.
+#if defined __has_include_next
+#if __has_include_next(<threads.h>)
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include_next <threads.h>
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#endif // has threads.h
+#endif // defined __has_include_next
+
+#else // checkedc && implicit include enabled
+#include <threads_checked.h>
+#endif

include/threads_checked.h

@@ -23,23 +23,34 @@ typedef void (tss_dtor_t)(void *);
 struct timespec;
 #else
 
-#ifndef __cplusplus
+#if defined __has_include_next
+#if __has_include_next(<threads.h>)
+
+#ifdef __checkedc
 #pragma CHECKED_SCOPE push
 #pragma CHECKED_SCOPE off
 #endif
-#include <threads.h>
 
-#ifndef __cplusplus
+#include_next <threads.h>
+
+#ifdef __checkedc
 #pragma CHECKED_SCOPE pop
 #endif
-#endif
 
-#ifndef __cplusplus
+#endif // has threads.h
+#endif // defined __has_include_next
+#endif // _CHECKEDC_MOCKUP_THREADS
+
+
+#if defined _CHECKEDC_MOCKUP_THREADS || \
+    (defined __has_include_next && __has_include_next(<threads.h>))
+
+#ifdef __checkedc
 #ifndef __THREADS_CHECKED_H
 #define __THREADS_CHECKED_H
 
 #pragma CHECKED_SCOPE push
-#pragma CHECKED_SCOPE ON
+#pragma CHECKED_SCOPE on
 
 void call_once(once_flag *flag : itype(_Ptr<once_flag>),
                void ((*fn)(void)) : itype(_Ptr<void (void)>));
@@ -82,4 +93,6 @@ int tss_set(tss_t key, void *value : itype(_Ptr<void>));
 #pragma CHECKED_SCOPE pop
 
 #endif // guard
-#endif // no C++
+#endif // Checked C 
+
+#endif

include/time.h

@@ -0,0 +1,23 @@
+//---------------------------------------------------------------------//
+// Wrapper header file that excludes Checked-C-specific declarations   //
+// if the compilation is not for Checked C, or if is for Checked C     //
+// but the implicit inclusion of checked header files is disabled.     //
+/////////////////////////////////////////////////////////////////////////
+
+
+#if !defined __checkedc || defined NO_IMPLICIT_INCLUDE_CHECKED_HDRS
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include_next <time.h>
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#else // checkedc && implicit include enabled
+#include <time_checked.h>
+#endif

include/time_checked.h

@@ -6,23 +6,23 @@
 // specification.                                                      //
 /////////////////////////////////////////////////////////////////////////
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE push
 #pragma CHECKED_SCOPE off
 #endif
 
-#include <time.h>
+#include_next <time.h>
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE pop
 #endif
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #ifndef __TIME_CHECKED_H
 #define __TIME_CHECKED_H
 
 #pragma CHECKED_SCOPE push
-#pragma CHECKED_SCOPE ON
+#pragma CHECKED_SCOPE on
 
 time_t mktime(struct tm *timeptr : itype(_Ptr<struct tm>));
 
@@ -49,5 +49,5 @@ size_t strftime(char * restrict output : count(maxsize),
 
 #pragma CHECKED_SCOPE pop
 
-#endif
-#endif
+#endif // guard
+#endif // Checked C

include/unistd.h

@@ -0,0 +1,32 @@
+//---------------------------------------------------------------------//
+// Wrapper header file that excludes Checked-C-specific declarations   //
+// if the compilation is not for Checked C, or if is for Checked C     //
+// but the implicit inclusion of checked header files is disabled.     //
+/////////////////////////////////////////////////////////////////////////
+
+
+#if !defined __checkedc || defined NO_IMPLICIT_INCLUDE_CHECKED_HDRS
+
+// Uses clang-specific __has_include macro to detect unistd.h
+// which is required by Posix Standard.
+// The Windows environment also may not have unistd.h
+#if defined __has_include_next
+#if __has_include_next(<unistd.h>)
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE push
+#pragma CHECKED_SCOPE off
+#endif
+
+#include_next <unistd.h>
+
+#ifdef __checkedc
+#pragma CHECKED_SCOPE pop
+#endif
+
+#endif // has unistd.h
+#endif // defined __has_include_next
+
+#else // checkedc && implicit include enabled
+#include <unistd_checked.h>
+#endif

include/unistd_checked.h

@@ -5,18 +5,25 @@
 // These are POSIX-only                                                //
 /////////////////////////////////////////////////////////////////////////
 
-#ifndef __cplusplus
+
+// Uses clang-specific __has_include macro to detect unistd.h
+// which is required by Posix Standard.
+// The Windows environment also may not have unistd.h
+#if defined __has_include_next
+#if __has_include_next(<unistd.h>)
+
+#ifdef __checkedc
 #pragma CHECKED_SCOPE push
 #pragma CHECKED_SCOPE off
 #endif
 
-#include <unistd.h>
+#include_next <unistd.h>
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #pragma CHECKED_SCOPE pop
 #endif
 
-#ifndef __cplusplus
+#ifdef __checkedc
 #ifndef __UNISTD_CHECKED_H
 #define __UNISTD_CHECKED_H
 
@@ -44,5 +51,8 @@ extern ssize_t write (int __fd, const void *__buf : byte_count(__n), size_t __n)
 
 #pragma CHECKED_SCOPE pop
 
-#endif
-#endif
+#endif // guard
+#endif // Checked C
+
+#endif // has unistd.h
+#endif // defined __has_include_next

tests/typechecking/redeclare_libraries.c

@@ -1,56 +0,0 @@
-// Feature tests of typechecking bounds-safe
-// interfaces for the C standard library.
-//
-// The following lines are for the LLVM test harness:
-//
-// Test include files in an unchecked scope
-//
-// RUN: %clang -fsyntax-only %s
-// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=0 %s
-// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=1 %s
-// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=2 %s
-//
-// Test include files in a checked scope.
-//
-// RUN: %clang -fsyntax-only  -DCHECKED_SCOPE=1 %s
-// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=0 -DCHECKED_SCOPE=1 %s
-// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=1 -DCHECKED_SCOPE=1 %s
-// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=2 -DCHECKED_SCOPE=1 %s
-
-#if CHECKED_SCOPE
-#pragma CHECKED_SCOPE on
-#endif
-
-// C Standard
-#include "../../include/assert_checked.h"
-#include "../../include/errno_checked.h"
-#include "../../include/fenv_checked.h"
-#include "../../include/inttypes_checked.h"
-#include "../../include/math_checked.h"
-#include "../../include/signal_checked.h"
-#include "../../include/stdio_checked.h"
-#include "../../include/stdlib_checked.h"
-#include "../../include/string_checked.h"
-#define _CHECKEDC_MOCKUP_THREADS 1
-#include "../../include/threads_checked.h"
-#include "../../include/time_checked.h"
-#include "../../include/checkedc_extensions.h"
-
-// Posix Headers
-//
-// Uses clang-specific __has_include macro to detect unistd.h
-// which is required by Posix Standard.
-#if defined(__has_include)
-#if __has_include(<unistd.h>)
-#include "../../include/unistd_checked.h"
-#endif
-
-#if __has_include(<sys/socket.h>)
-#include "../../include/sys/socket_checked.h"
-#endif
-
-#if __has_include(<arpa/inet.h>)
-#include "../../include/arpa/inet_checked.h"
-#endif
-
-#endif

tests/typechecking/redeclare_libs_explicit.c

@@ -0,0 +1,120 @@
+// Feature tests of typechecking bounds-safe
+// interfaces for the C standard library.
+//
+// The following lines are for the LLVM test harness:
+//
+// Test include files in an unchecked scope
+//
+// RUN: %clang -fsyntax-only %s
+// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=0 %s
+// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=1 %s
+// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=2 %s
+//
+// Test include files in a checked scope.
+//
+// RUN: %clang -fsyntax-only  -DCHECKED_SCOPE=1 %s
+// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=0 -DCHECKED_SCOPE=1 %s
+// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=1 -DCHECKED_SCOPE=1 %s
+// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=2 -DCHECKED_SCOPE=1 %s
+//
+// Test include files for all combinations of Checked C enabled/disabled,
+// and implicit inclusion of checked headers enabled/disabled. By default, both
+// are enabled.
+//
+// Checked headers are disabled for no Checked C.
+// RUN: %clang -fno-checkedc-extension -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+// RUN: %clang -fno-checkedc-extension -DNO_IMPLICIT_INCLUDE_CHECKED_HDRS -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+//
+// Checked headers are enabled for Checked C and implicit inclusion.
+// RUN: %clang -E %s | FileCheck %s --check-prefix CHECK_ENABLED
+//
+// Checked headers are enabled because explicit inclusion overrides the
+// disabling of implicit inclusion.
+// RUN: %clang -DNO_IMPLICIT_INCLUDE_CHECKED_HDRS -E %s | FileCheck %s --check-prefix CHECK_ENABLED
+
+
+#if CHECKED_SCOPE
+#pragma CHECKED_SCOPE on
+#endif
+
+// C Standard
+#include <assert_checked.h>
+// CHECK_ENABLED: assert_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: assert_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <errno_checked.h>
+// CHECK_ENABLED: errno_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: errno_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <fenv_checked.h>
+// CHECK_ENABLED: fenv_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: fenv_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <inttypes_checked.h>
+// CHECK_ENABLED: inttypes_checked_internal.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: inttypes_checked_internal.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <math_checked.h>
+// CHECK_ENABLED: math_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: math_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <signal_checked.h>
+// CHECK_ENABLED: signal_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: signal_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <stdio_checked.h>
+// CHECK_ENABLED: stdio_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: stdio_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <stdlib_checked.h>
+// CHECK_ENABLED: stdlib_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: stdlib_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <string_checked.h>
+// CHECK_ENABLED: string_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: string_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#define _CHECKEDC_MOCKUP_THREADS 1
+#include <threads_checked.h>
+// CHECK_ENABLED: threads_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: threads_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <time_checked.h>
+// CHECK_ENABLED: time_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: time_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <checkedc_extensions.h>
+// CHECK_ENABLED: checkedc_extensions.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: checkedc_extensions.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+
+
+// Posix Headers
+// These header files may or may not be present in all environments.
+#include <unistd_checked.h>
+#include <sys/socket_checked.h>
+#include <arpa/inet_checked.h>

tests/typechecking/redeclare_libs_explicit_linux.c

@@ -0,0 +1,42 @@
+// UNSUPPORTED: system-windows
+//
+// Test include files for all combinations of Checked C enabled/disabled,
+// and implicit inclusion of checked headers enabled/disabled. By default, both
+// are enabled.
+//
+// Checked headers are disabled for no Checked C.
+// RUN: %clang -fno-checkedc-extension -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+// RUN: %clang -fno-checkedc-extension -DNO_IMPLICIT_INCLUDE_CHECKED_HDRS -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+//
+// Checked headers are enabled for Checked C and implicit inclusion.
+// RUN: %clang -E %s | FileCheck %s --check-prefix CHECK_ENABLED
+//
+// Checked headers are enabled because explicit inclusion overrides the
+// disabling of implicit inclusion.
+// RUN: %clang -DNO_IMPLICIT_INCLUDE_CHECKED_HDRS -E %s | FileCheck %s --check-prefix CHECK_ENABLED
+
+
+#if CHECKED_SCOPE
+#pragma CHECKED_SCOPE on
+#endif
+
+
+// Posix Headers
+// These header files are not present in the Windows compilation environment.
+#include <unistd_checked.h>
+// CHECK_ENABLED: unistd_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: unistd_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <sys/socket_checked.h>
+// CHECK_ENABLED: socket_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: socket_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <arpa/inet_checked.h>
+// CHECK_ENABLED: inet_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED: inet_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on

tests/typechecking/redeclare_libs_implicit.c

@@ -0,0 +1,113 @@
+// Feature tests of typechecking bounds-safe
+// interfaces for the C standard library.
+//
+// The following lines are for the LLVM test harness:
+//
+// Test include files in an unchecked scope
+//
+// RUN: %clang -fsyntax-only %s
+// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=0 %s
+// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=1 %s
+// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=2 %s
+//
+// Test include files in a checked scope.
+//
+// RUN: %clang -fsyntax-only  -DCHECKED_SCOPE=1 %s
+// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=0 -DCHECKED_SCOPE=1 %s
+// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=1 -DCHECKED_SCOPE=1 %s
+// RUN: %clang -fsyntax-only -D_FORTIFY_SOURCE=2 -DCHECKED_SCOPE=1 %s
+//
+// Test include files for all combinations of Checked C enabled/disabled,
+// and implicit inclusion of checked headers enabled/disabled. By default, both
+// are enabled.
+//
+// Checked headers are disabled for no Checked C.
+// RUN: %clang -fno-checkedc-extension -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+// RUN: %clang -fno-checkedc-extension -DNO_IMPLICIT_INCLUDE_CHECKED_HDRS -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+//
+// Checked headers are enabled for Checked C and implicit inclusion.
+// RUN: %clang -E %s | FileCheck %s --check-prefix CHECK_ENABLED
+//
+// Checked headers are disabled because implicit inclusion is disabled.
+// RUN: %clang -DNO_IMPLICIT_INCLUDE_CHECKED_HDRS -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+
+
+#if CHECKED_SCOPE
+#pragma CHECKED_SCOPE on
+#endif
+
+// C Standard
+#include <assert.h>
+// CHECK_ENABLED: assert_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: assert_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <errno.h>
+// CHECK_ENABLED: errno_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: errno_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <fenv.h>
+// CHECK_ENABLED: fenv_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: fenv_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <inttypes.h>
+// CHECK_ENABLED: inttypes_checked_internal.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: inttypes_checked_internal.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <math.h>
+// CHECK_ENABLED: math_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: math_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <signal.h>
+// CHECK_ENABLED: signal_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: signal_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <stdio.h>
+// CHECK_ENABLED: stdio_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: stdio_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <stdlib.h>
+// CHECK_ENABLED: stdlib_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: stdlib_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <string.h>
+// CHECK_ENABLED: string_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: string_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#define _CHECKEDC_MOCKUP_THREADS 1
+#include <threads.h>
+// CHECK_ENABLED: threads_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: threads_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <time.h>
+// CHECK_ENABLED: time_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: time_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+
+
+// Posix Headers
+// These header files may or may not be present in all environments.
+#include <unistd.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>

tests/typechecking/redeclare_libs_implicit_linux.c

@@ -0,0 +1,36 @@
+// UNSUPPORTED: system-windows
+//
+// Test include files for all combinations of Checked C enabled/disabled,
+// and implicit inclusion of checked headers enabled/disabled. By default, both
+// are enabled.
+//
+// Checked headers are disabled for no Checked C.
+// RUN: %clang -fno-checkedc-extension -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+// RUN: %clang -fno-checkedc-extension -DNO_IMPLICIT_INCLUDE_CHECKED_HDRS -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+//
+// Checked headers are enabled for Checked C and implicit inclusion.
+// RUN: %clang -E %s | FileCheck %s --check-prefix CHECK_ENABLED
+//
+// Checked headers are disabled because implicit inclusion is disabled.
+// RUN: %clang -DNO_IMPLICIT_INCLUDE_CHECKED_HDRS -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+
+
+// Posix Headers
+// These header files are not present in the Windows compilation environment.
+#include <unistd.h>
+// CHECK_ENABLED: unistd_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: unistd_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <sys/socket.h>
+// CHECK_ENABLED: socket_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: socket_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on
+
+#include <arpa/inet.h>
+// CHECK_ENABLED: inet_checked.h
+// CHECK_ENABLED: #pragma CHECKED_SCOPE on
+// CHECK_DISABLED-NOT: inet_checked.h
+// CHECK_DISABLED-NOT: #pragma CHECKED_SCOPE on

tests/typechecking/redeclare_libs_mixed.c

@@ -0,0 +1,77 @@
+// Feature tests of typechecking bounds-safe
+// interfaces for the C standard library.
+//
+// Test include files for all combinations of Checked C enabled/disabled,
+// and implicit inclusion of checked headers enabled/disabled. By default, both
+// are enabled.
+//
+// Checked headers are disabled for no Checked C.
+// Already tested in redeclare_libs_explicit.c and redeclare_libs_implicit.c.
+//    %clang -fno-checkedc-extension -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+//    %clang -fno-checkedc-extension -DNO_IMPLICIT_INCLUDE_CHECKED_HDRS -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+//
+// Checked headers are enabled for Checked C and implicit inclusion.
+// Already tested in redeclare_libs_explicit.c and redeclare_libs_implicit.c.
+//    %clang -E %s | FileCheck %s --check-prefix CHECK_ENABLED
+//
+// Checked headers are enabled/disabled depending on whether foo.h or
+// foo_checked.h is included for a system header file foo.h.
+// RUN: %clang -DNO_IMPLICIT_INCLUDE_CHECKED_HDRS -E %s | FileCheck %s --check-prefix CHECK_MIXED
+
+
+// C Standard
+#include <assert_checked.h>
+// CHECK_MIXED: assert_checked.h
+// CHECK_MIXED: #pragma CHECKED_SCOPE on
+
+#include <errno.h>
+// CHECK_MIXED-NOT: errno_checked.h
+// CHECK_MIXED-NOT: #pragma CHECKED_SCOPE on
+
+#include <fenv_checked.h>
+// CHECK_MIXED: fenv_checked.h
+// CHECK_MIXED: #pragma CHECKED_SCOPE on
+
+#include <inttypes.h>
+// CHECK_MIXED-NOT: inttypes_checked_internal.h
+// CHECK_MIXED-NOT: #pragma CHECKED_SCOPE on
+
+#include <math_checked.h>
+// CHECK_MIXED: math_checked.h
+// CHECK_MIXED: #pragma CHECKED_SCOPE on
+
+#include <signal.h>
+// CHECK_MIXED-NOT: signal_checked.h
+// CHECK_MIXED-NOT: #pragma CHECKED_SCOPE on
+
+#include <stdio_checked.h>
+// CHECK_MIXED: stdio_checked.h
+// CHECK_MIXED: #pragma CHECKED_SCOPE on
+
+#include <stdlib.h>
+// CHECK_MIXED-NOT: stdlib_checked.h
+// CHECK_MIXED-NOT: #pragma CHECKED_SCOPE on
+
+#include <string_checked.h>
+// CHECK_MIXED: string_checked.h
+// CHECK_MIXED: #pragma CHECKED_SCOPE on
+
+#define _CHECKEDC_MOCKUP_THREADS 1
+#include <threads.h>
+// CHECK_MIXED-NOT: threads_checked.h
+// CHECK_MIXED-NOT: #pragma CHECKED_SCOPE on
+
+#include <time_checked.h>
+// CHECK_MIXED: time_checked.h
+// CHECK_MIXED: #pragma CHECKED_SCOPE on
+
+#include <checkedc_extensions.h>
+// CHECK_MIXED: checkedc_extensions.h
+// CHECK_MIXED: #pragma CHECKED_SCOPE on
+
+
+// Posix Headers
+// These header files may or may not be present in all environments.
+#include <unistd_checked.h>
+#include <sys/socket.h>
+#include <arpa/inet_checked.h>

tests/typechecking/redeclare_libs_mixed_linux.c

@@ -0,0 +1,33 @@
+// UNSUPPORTED: system-windows
+//
+// Test include files for all combinations of Checked C enabled/disabled,
+// and implicit inclusion of checked headers enabled/disabled. By default, both
+// are enabled.
+//
+// Checked headers are disabled for no Checked C.
+// Already tested in redeclare_libs_explicit.c and redeclare_libs_implicit.c.
+//    %clang -fno-checkedc-extension -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+//    %clang -fno-checkedc-extension -DNO_IMPLICIT_INCLUDE_CHECKED_HDRS -E %s | FileCheck %s --check-prefix CHECK_DISABLED
+//
+// Checked headers are enabled for Checked C and implicit inclusion.
+// Already tested in redeclare_libs_explicit.c and redeclare_libs_implicit.c.
+//    %clang -E %s | FileCheck %s --check-prefix CHECK_ENABLED
+//
+// Checked headers are enabled/disabled depending on whether foo.h or
+// foo_checked.h is included for a system header file foo.h.
+// RUN: %clang -DNO_IMPLICIT_INCLUDE_CHECKED_HDRS -E %s | FileCheck %s --check-prefix CHECK_MIXED
+
+
+// Posix Headers
+// These header files are not present in the Windows compilation environment.
+#include <unistd_checked.h>
+// CHECK_MIXED: unistd_checked.h
+// CHECK_MIXED: #pragma CHECKED_SCOPE on
+
+#include <sys/socket.h>
+// CHECK_MIXED-NOT: socket_checked.h
+// CHECK_MIXED-NOT: #pragma CHECKED_SCOPE on
+
+#include <arpa/inet_checked.h>
+// CHECK_MIXED: inet_checked.h
+// CHECK_MIXED: #pragma CHECKED_SCOPE on