Add JEMALLOC_FORMAT_PRINTF().
Replace JEMALLOC_ATTR(format(printf, ...). with
JEMALLOC_FORMAT_PRINTF(), so that configuration feature tests can
omit the attribute if it would cause extraneous compilation warnings.
diff --git a/configure.ac b/configure.ac
index c6388f7..f7e6d08 100644
--- a/configure.ac
+++ b/configure.ac
@@ -438,6 +438,26 @@
if test "x${je_cv_alloc_size}" = "xyes" ; then
AC_DEFINE([JEMALLOC_HAVE_ATTR_ALLOC_SIZE], [ ])
fi
+dnl Check for format(gnu_printf, ...) attribute support.
+SAVED_CFLAGS="${CFLAGS}"
+JE_CFLAGS_APPEND([-Werror])
+JE_COMPILABLE([format(gnu_printf, ...) attribute], [#include <stdlib.h>],
+ [void *foo(const char *format, ...) __attribute__((format(gnu_printf, 1, 2)));],
+ [je_cv_format_gnu_printf])
+CFLAGS="${SAVED_CFLAGS}"
+if test "x${je_cv_format_gnu_printf}" = "xyes" ; then
+ AC_DEFINE([JEMALLOC_HAVE_ATTR_FORMAT_GNU_PRINTF], [ ])
+fi
+dnl Check for format(printf, ...) attribute support.
+SAVED_CFLAGS="${CFLAGS}"
+JE_CFLAGS_APPEND([-Werror])
+JE_COMPILABLE([format(printf, ...) attribute], [#include <stdlib.h>],
+ [void *foo(const char *format, ...) __attribute__((format(printf, 1, 2)));],
+ [je_cv_format_printf])
+CFLAGS="${SAVED_CFLAGS}"
+if test "x${je_cv_format_printf}" = "xyes" ; then
+ AC_DEFINE([JEMALLOC_HAVE_ATTR_FORMAT_PRINTF], [ ])
+fi
dnl Support optional additions to rpath.
AC_ARG_WITH([rpath],