New macro GNUC_PREREQ for GCC version

* src/conf_post.h (GNUC_PREREQ): New macro.
Change uses of __GNUC_MINOR__ and __GNUC_PATCHLEVEL__ to use this
macro instead, for clarity and consistency.
(PRINTF_ARCHETYPE): New macro.  Define it to __gnu_printf__ only
if glibc, since non-GNU platforms don’t necessarily support GNU
printf formats.
(ATTRIBUTE_FORMAT_PRINTF): Use it.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/process.c b/src/process.c
index 4d287d8cc51..e669278f6e3 100644
--- a/src/process.c
+++ b/src/process.c
@@ -130,10 +130,10 @@ extern int sys_select (int, fd_set *, fd_set *, fd_set *,
                        struct timespec *, void *);
 #endif
 
-/* Work around GCC 4.7.0 bug with strict overflow checking; see
+/* Work around GCC 4.3.0 bug with strict overflow checking; see
    <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52904>.
    This bug appears to be fixed in GCC 5.1, so don't work around it there.  */
-#if __GNUC__ == 4 && __GNUC_MINOR__ >= 3
+#if GNUC_PREREQ (4, 3, 0) && ! GNUC_PREREQ (5, 1, 0)
 # pragma GCC diagnostic ignored "-Wstrict-overflow"
 #endif