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CMake: Feature-detect __builtin_{add,sub}_overflow

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This commit is contained in:
Justin M. Keyes 2019-01-08 22:00:52 +01:00
parent 596f020e90
commit fc4ca5bdd8
2 changed files with 15 additions and 4 deletions
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10
CMakeLists.txt
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@ -248,6 +248,16 @@ int main(void)
}
" HAVE_EXECINFO_BACKTRACE)
check_c_source_compiles("
int main(void)
{
int a;
__builtin_add_overflow(a, a, &a);
__builtin_sub_overflow(a, a, &a);
return 0;
}
" HAVE_BUILTIN_ADD_OVERFLOW)
if(MSVC)
# XXX: /W4 gives too many warnings. #3241
add_definitions(/W3 -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_DEPRECATE)

9
src/nvim/assert.h
View File

@ -122,6 +122,7 @@
#endif
/// @def STRICT_ADD
/// @brief Adds (a + b) and stores result in `c`. Aborts on overflow.
///
/// Requires GCC 5+ and Clang 3.8+
/// https://clang.llvm.org/docs/LanguageExtensions.html
@ -132,8 +133,7 @@
///
/// @param MAX Maximum value of the narrowest type of operand.
/// Not used if compiler supports __builtin_add_overflow.
#if (defined(__clang__) && __has_builtin(__builtin_add_overflow)) \
|| (__GNUC__ >= 5)
#if HAVE_BUILTIN_ADD_OVERFLOW
# define STRICT_ADD(a, b, c, t) \
do { if (__builtin_add_overflow(a, b, c)) { abort(); } } while (0)
#else
@ -141,8 +141,9 @@
do { *(c) = (t)(a + b); } while (0)
#endif
#if (defined(__clang__) && __has_builtin(__builtin_sub_overflow)) \
|| (__GNUC__ >= 5)
/// @def STRICT_SUB
/// @brief Subtracts (a - b) and stores result in `c`. Aborts on overflow.
#if HAVE_BUILTIN_ADD_OVERFLOW
# define STRICT_SUB(a, b, c, t) \
do { if (__builtin_sub_overflow(a, b, c)) { abort(); } } while (0)
#else