Raise the minimum required gcc version to 4.6
Various architectures fail to build properly with older versions of the gcc compiler. An example from Guenter Roeck in thread [1]: > > In file included from ./include/linux/mm.h:17:0, > from ./include/linux/pid_namespace.h:7, > from ./include/linux/ptrace.h:10, > from arch/openrisc/kernel/asm-offsets.c:32: > ./include/linux/mm_types.h:497:16: error: flexible array member in otherwise empty struct > > This is just an example with gcc 4.5.1 for or32. I have seen the problem > with gcc 4.4 (for unicore32) as well. So update the minimum required version of gcc to 4.6. [1] https://lore.kernel.org/lkml/20180814170904.GA12768@roeck-us.net/ Miscellanea: - Update Documentation/process/changes.rst - Remove and consolidate version test blocks in compiler-gcc.h for versions lower than 4.6 Signed-off-by: Joe Perches <joe@perches.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Joe Perches
Linus Torvalds
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cc26ebbebd
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cafa0010cd
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@ -29,7 +29,7 @@ you probably needn't concern yourself with isdn4k-utils.
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====================== =============== ========================================
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Program Minimal version Command to check the version
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====================== =============== ========================================
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GNU C 3.2 gcc --version
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GNU C 4.6 gcc --version
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GNU make 3.81 make --version
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binutils 2.20 ld -v
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flex 2.5.35 flex --version
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@ -10,6 +10,10 @@
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+ __GNUC_MINOR__ * 100 \
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+ __GNUC_PATCHLEVEL__)
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#if GCC_VERSION < 40600
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# error Sorry, your compiler is too old - please upgrade it.
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#endif
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/* Optimization barrier */
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/* The "volatile" is due to gcc bugs */
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@ -58,6 +62,12 @@
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#define OPTIMIZER_HIDE_VAR(var) \
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__asm__ ("" : "=r" (var) : "0" (var))
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/*
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* A trick to suppress uninitialized variable warning without generating any
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* code
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*/
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#define uninitialized_var(x) x = x
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#ifdef __CHECKER__
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#define __must_be_array(a) 0
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#else
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@ -91,7 +101,7 @@
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* A lot of inline functions can cause havoc with function tracing.
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*/
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#if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \
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!defined(CONFIG_OPTIMIZE_INLINING) || (__GNUC__ < 4)
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!defined(CONFIG_OPTIMIZE_INLINING)
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#define inline \
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inline __attribute__((always_inline, unused)) notrace __gnu_inline
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#else
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@ -147,47 +157,13 @@
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#define __always_unused __attribute__((unused))
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#define __mode(x) __attribute__((mode(x)))
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/* gcc version specific checks */
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#if GCC_VERSION < 30200
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# error Sorry, your compiler is too old - please upgrade it.
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#endif
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#if GCC_VERSION < 30300
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# define __used __attribute__((__unused__))
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#else
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# define __used __attribute__((__used__))
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#endif
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#ifdef CONFIG_GCOV_KERNEL
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# if GCC_VERSION < 30400
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# error "GCOV profiling support for gcc versions below 3.4 not included"
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# endif /* __GNUC_MINOR__ */
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#endif /* CONFIG_GCOV_KERNEL */
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#if GCC_VERSION >= 30400
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#define __must_check __attribute__((warn_unused_result))
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#define __malloc __attribute__((__malloc__))
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#endif
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#if GCC_VERSION >= 40000
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/* GCC 4.1.[01] miscompiles __weak */
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#ifdef __KERNEL__
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# if GCC_VERSION >= 40100 && GCC_VERSION <= 40101
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# error Your version of gcc miscompiles the __weak directive
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# endif
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#endif
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#define __used __attribute__((__used__))
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#define __compiler_offsetof(a, b) \
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__builtin_offsetof(a, b)
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#if GCC_VERSION >= 40100
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# define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
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#endif
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#if GCC_VERSION >= 40300
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/* Mark functions as cold. gcc will assume any path leading to a call
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* to them will be unlikely. This means a lot of manual unlikely()s
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* are unnecessary now for any paths leading to the usual suspects
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@ -206,24 +182,19 @@
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#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
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#ifndef __CHECKER__
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# define __compiletime_warning(message) __attribute__((warning(message)))
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# define __compiletime_error(message) __attribute__((error(message)))
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#endif /* __CHECKER__ */
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#endif /* GCC_VERSION >= 40300 */
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#if GCC_VERSION >= 40400
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#define __optimize(level) __attribute__((__optimize__(level)))
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#define __nostackprotector __optimize("no-stack-protector")
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#endif /* GCC_VERSION >= 40400 */
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#if GCC_VERSION >= 40500
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#define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
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#ifndef __CHECKER__
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#define __compiletime_warning(message) __attribute__((warning(message)))
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#define __compiletime_error(message) __attribute__((error(message)))
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#ifdef LATENT_ENTROPY_PLUGIN
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#define __latent_entropy __attribute__((latent_entropy))
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#endif
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#endif
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#endif /* __CHECKER__ */
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/*
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* calling noreturn functions, __builtin_unreachable() and __builtin_trap()
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@ -261,10 +232,6 @@
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#define randomized_struct_fields_end } __randomize_layout;
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#endif
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#endif /* GCC_VERSION >= 40500 */
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#if GCC_VERSION >= 40600
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/*
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* When used with Link Time Optimization, gcc can optimize away C functions or
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* variables which are referenced only from assembly code. __visible tells the
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@ -273,8 +240,7 @@
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*/
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#define __visible __attribute__((externally_visible))
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#endif /* GCC_VERSION >= 40600 */
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/* gcc version specific checks */
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#if GCC_VERSION >= 40900 && !defined(__CHECKER__)
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/*
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@ -308,10 +274,8 @@
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* folding in __builtin_bswap*() (yet), so don't set these for it.
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*/
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#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) && !defined(__CHECKER__)
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#if GCC_VERSION >= 40400
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#define __HAVE_BUILTIN_BSWAP32__
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#define __HAVE_BUILTIN_BSWAP64__
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#endif
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#if GCC_VERSION >= 40800
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#define __HAVE_BUILTIN_BSWAP16__
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#endif
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@ -340,10 +304,9 @@
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* https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html
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*/
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#define __designated_init __attribute__((designated_init))
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#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
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#endif
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#endif /* gcc version >= 40000 specific checks */
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#if !defined(__noclone)
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#define __noclone /* not needed */
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#endif
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@ -352,16 +315,6 @@
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#define __no_sanitize_address
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#endif
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/*
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* A trick to suppress uninitialized variable warning without generating any
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* code
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*/
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#define uninitialized_var(x) x = x
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#if GCC_VERSION >= 50100
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#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
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#endif
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/*
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* Turn individual warnings and errors on and off locally, depending
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* on version.
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@ -374,12 +327,9 @@
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#define __diag_GCC_warn warning
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#define __diag_GCC_error error
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/* Compilers before gcc-4.6 do not understand "#pragma GCC diagnostic push" */
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#if GCC_VERSION >= 40600
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#define __diag_str1(s) #s
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#define __diag_str(s) __diag_str1(s)
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#define __diag(s) _Pragma(__diag_str(GCC diagnostic s))
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#endif
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#if GCC_VERSION >= 80000
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#define __diag_GCC_8(s) __diag(s)
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