From 656517b9ef5cf443f72110dcd56b15825bc7f1ef Mon Sep 17 00:00:00 2001 From: Jakub Narebski Date: Fri, 4 Aug 2006 17:55:57 +0200 Subject: [PATCH] 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 Signed-off-by: Junio C Hamano --- configure.ac | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/configure.ac b/configure.ac index 0a54b4493..a4becf8fa 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 ]) +# +# 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. -- 2.26.2