diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 17db0b053f..d24a7b5cee 100644 --- a/configure.ac +++ b/configure.ac @@ -911,6 +911,25 @@ if test "x${have_backtrace}" = "xyes"; then fi AC_SUBST(HAVE_BACKTRACE) +dnl Old (before C11) compiler can compile (but not link) this: +dnl +dnl int main () { +dnl _Static_assert(1, "True"); +dnl return 0; +dnl } +dnl +dnl assuming that _Static_assert is an implicitly declared function. So +dnl we're trying to link just to make sure that this is not the case. + +AC_MSG_CHECKING([whether $CC supports C11 _Static_assert]) +AC_TRY_LINK([], [_Static_assert(1, "True");], + [STATIC_ASSERT=yes], [STATIC_ASSERT=no]) + +AC_MSG_RESULT([$STATIC_ASSERT]) +if test x$STATIC_ASSERT = "xyes"; then + AC_DEFINE(HAVE_STATIC_ASSERT, 1, [Define if C11 _Static_assert is supported.]) +fi + if test "x${have_backtrace}" != "xyes"; then AC_TRY_COMPILE([#include <math.h>], [double x=0.0; x=ceil(0.0);], [], |