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autoconf: Check for ll hh j z t size specifiers introduced by C99 

Add custom test for checking whether formatted IO functions
(printf/scanf et.al.) support 'size specifiers' introduced by C99,
namely ll, hh, j, z, t. (representing long long int, char, intmax_t,
size_t, ptrdiff_t).

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Jakub Narebski 2006-08-04 17:55:57 +02:00 committed by Junio C Hamano
parent eb858c56cb
commit 656517b9ef
1 changed files with 21 additions and 0 deletions
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21
configure.ac
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@ -189,6 +189,27 @@ AC_CHECK_MEMBER(struct dirent.d_type,[],
AC_CHECK_TYPE(struct sockaddr_storage,[],
[GIT_CONF_APPEND_LINE(NO_SOCKADDR_STORAGE=YesPlease)],
[#include <netinet/in.h>])
#
# Define NO_C99_FORMAT if your formatted IO functions (printf/scanf et.al.)
# do not support the 'size specifiers' introduced by C99, namely ll, hh,
# j, z, t. (representing long long int, char, intmax_t, size_t, ptrdiff_t).
# some C compilers supported these specifiers prior to C99 as an extension.
AC_CACHE_CHECK(whether IO functions support %ll %hh %j %z %t size specifiers,
ac_cv_c_c99_format,
[# Actually git uses only %z (%zu) in alloc.c, and %t (%td) in mktag.c
AC_RUN_IFELSE(
[AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
[[char buf[64];
if (sprintf(buf, "%lld%hhd%jd%zd%td", (long long int)1, (char)2, (intmax_t)3, (size_t)4, (ptrdiff_t)5) != 5)
exit(1);
else if (strcmp(buf, "12345"))
exit(2);]])],
[ac_cv_c_c99_format=yes],
[ac_cv_c_c99_format=no])
])
if test $ac_cv_c_c99_format = no; then
GIT_CONF_APPEND_LINE(NO_C99_FORMAT=YesPlease)
fi
## Checks for library functions.