CodingGuidelines: update for C99
Since 7bc341e21b5 (git-compat-util: add a test balloon for C99
support, 2021-12-01) we've had a hard dependency on C99, but the prose
in CodingGuidelines was written under the assumption that we were
using C89 with a few C99 features.
As the updated prose notes we'd still like to hold off on novel C99
features, but let's make it clear that we target that C version, and
then enumerate new C99 features that are safe to use.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
index 9fca21c..386ca0a 100644
--- a/Documentation/CodingGuidelines
+++ b/Documentation/CodingGuidelines
@@ -204,10 +204,14 @@
by e.g. "echo DEVELOPER=1 >>config.mak".
- We try to support a wide range of C compilers to compile Git with,
- including old ones. You should not use features from newer C
+ including old ones. As of Git v2.35.0 Git requires C99 (we check
+ "__STDC_VERSION__"). You should not use features from a newer C
standard, even if your compiler groks them.
- There are a few exceptions to this guideline:
+ New C99 features have been phased in gradually, if something's new
+ in C99 but not used yet don't assume that it's safe to use, some
+ compilers we target have only partial support for it. These are
+ considered safe to use:
. since early 2012 with e1327023ea, we have been using an enum
definition whose last element is followed by a comma. This, like
