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| author |  Jakub Narebski <jnareb@gmail.com> | 2006-08-04 17:55:57 +0200 |
|---|---|---|
| committer |  Junio C Hamano <junkio@cox.net> | 2006-08-04 11:46:27 -0700 |
| commit | 656517b9ef5cf443f72110dcd56b15825bc7f1ef (patch) | |
| tree | f4a7e6691e3c15be65dd63ebfa08273b0a06c58d | |
| parent | autoconf: Add support for setting PYTHON_PATH or NO_PYTHON (diff) | |
| download | tgif-656517b9ef5cf443f72110dcd56b15825bc7f1ef.tar.xz | |
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>
| -rw-r--r-- | configure.ac | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 0a54b44939..a4becf8fa5 100644 --- a/configure.ac +++ b/configure.ac @@ -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. |