diff options
| -rw-r--r-- | source4/build/m4/check_cc.m4 | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/source4/build/m4/check_cc.m4 b/source4/build/m4/check_cc.m4 index 4850ec5504..c15da03637 100644 --- a/source4/build/m4/check_cc.m4 +++ b/source4/build/m4/check_cc.m4 @@ -86,11 +86,28 @@ fi ############################################ # check if the compiler can handle negative enum values +# and don't truncate the values to INT_MAX +# a runtime test is needed here AC_CACHE_CHECK([that the C compiler understands negative enum values],SMB_BUILD_CC_NEGATIVE_ENUM_VALUES, [ - AC_TRY_COMPILE([ -#include <stdio.h>], + AC_TRY_RUN( [ + #include <stdio.h> enum negative_values { NEGATIVE_VALUE = 0xFFFFFFFF }; + int main(void) { + enum negative_values v1 = NEGATIVE_VALUE; + unsigned v2 = NEGATIVE_VALUE; + + if (v1 != 0xFFFFFFFF) { + printf("%u != 0xFFFFFFFF\n", v1); + return 1; + } + if (v2 != 0xFFFFFFFF) { + printf("%u != 0xFFFFFFFF\n", v2); + return 1; + } + + return 0; + } ], SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=yes,SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=no)]) if test x"$SMB_BUILD_CC_NEGATIVE_ENUM_VALUES" != x"yes"; then |