Bug 933047 - Add a configure check whether the C++ compiler actually is a C++ compiler. r=ted

build/autoconf/compiler-opts.m4

@@ -192,6 +192,18 @@ if test "$CLANG_CXX"; then
     _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} -Wno-unknown-warning-option -Wno-return-type-c-linkage -Wno-mismatched-tags"
 fi
 
+AC_MSG_CHECKING([whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) actually is a C++ compiler])
+AC_LANG_SAVE
+AC_LANG_CPLUSPLUS
+_SAVE_LIBS=$LIBS
+LIBS=
+AC_TRY_LINK([#include <new>], [int *foo = new int;],,
+            AC_MSG_RESULT([no])
+            AC_MSG_ERROR([$CXX $CXXFLAGS $LDFLAGS failed to compile and link a simple C++ source.]))
+LIBS=$_SAVE_LIBS
+AC_LANG_RESTORE
+AC_MSG_RESULT([yes])
+
 if test -z "$GNU_CC"; then
     case "$target" in
     *-mingw*)

js/src/build/autoconf/compiler-opts.m4

@@ -192,6 +192,18 @@ if test "$CLANG_CXX"; then
     _WARNINGS_CXXFLAGS="${_WARNINGS_CXXFLAGS} -Wno-unknown-warning-option -Wno-return-type-c-linkage -Wno-mismatched-tags"
 fi
 
+AC_MSG_CHECKING([whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) actually is a C++ compiler])
+AC_LANG_SAVE
+AC_LANG_CPLUSPLUS
+_SAVE_LIBS=$LIBS
+LIBS=
+AC_TRY_LINK([#include <new>], [int *foo = new int;],,
+            AC_MSG_RESULT([no])
+            AC_MSG_ERROR([$CXX $CXXFLAGS $LDFLAGS failed to compile and link a simple C++ source.]))
+LIBS=$_SAVE_LIBS
+AC_LANG_RESTORE
+AC_MSG_RESULT([yes])
+
 if test -z "$GNU_CC"; then
     case "$target" in
     *-mingw*)