[PATCH 2/4] 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>
---
 configure.ac |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index 178220f..1796cf4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -189,6 +189,27 @@ # sockaddr_storage.
 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.
-- 
1.4.1.1

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