diff options
Diffstat (limited to 'trunk/m4/compiler_characteristics.m4')
| -rw-r--r-- | trunk/m4/compiler_characteristics.m4 | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/trunk/m4/compiler_characteristics.m4 b/trunk/m4/compiler_characteristics.m4 new file mode 100644 index 0000000..2b62893 --- /dev/null +++ b/trunk/m4/compiler_characteristics.m4 @@ -0,0 +1,24 @@ +# Check compiler characteristics (e.g. type sizes, PRIxx macros, ...) + +# If types $1 and $2 are compatible, perform action $3 +AC_DEFUN([AC_TYPES_COMPATIBLE], + [AC_TRY_COMPILE([#include <stddef.h>], [$1 v1 = 0; $2 v2 = 0; return (&v1 - &v2)], $3)]) + +define(AC_PRIUS_COMMENT, [printf format code for printing a size_t and ssize_t]) + +AC_DEFUN([AC_COMPILER_CHARACTERISTICS], + [AC_CACHE_CHECK(AC_PRIUS_COMMENT, ac_cv_formatting_prius_prefix, + [AC_TYPES_COMPATIBLE(unsigned int, size_t, + ac_cv_formatting_prius_prefix=; ac_cv_prius_defined=1) + AC_TYPES_COMPATIBLE(unsigned long, size_t, + ac_cv_formatting_prius_prefix=l; ac_cv_prius_defined=1) + AC_TYPES_COMPATIBLE(unsigned long long, size_t, + ac_cv_formatting_prius_prefix=ll; ac_cv_prius_defined=1 + )]) + if test -z "$ac_cv_prius_defined"; then + ac_cv_formatting_prius_prefix=z; + fi + AC_DEFINE_UNQUOTED(PRIuS, "${ac_cv_formatting_prius_prefix}u", AC_PRIUS_COMMENT) + AC_DEFINE_UNQUOTED(PRIxS, "${ac_cv_formatting_prius_prefix}x", AC_PRIUS_COMMENT) + AC_DEFINE_UNQUOTED(PRIdS, "${ac_cv_formatting_prius_prefix}d", AC_PRIUS_COMMENT) +]) |