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flex: Keep it at C17 with clang

Message ID 20260409055617.917253-1-khem.raj@oss.qualcomm.com
State Accepted, archived
Commit 2f9a3af45b8ec821b6cd64a3758592d4e76e7bc3
Headers show
Series flex: Keep it at C17 with clang | expand

Commit Message

Khem Raj April 9, 2026, 5:56 a.m. UTC 
autoconf 2.73 enforces C23 and adds -std=gnu23 but it leaks it into
CC_FOR_BUILD as well, which bites on systems with GCC < 14 where this
option does not exist.

Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>
---
 meta/recipes-devtools/flex/flex_2.6.4.bb | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/meta/recipes-devtools/flex/flex_2.6.4.bb b/meta/recipes-devtools/flex/flex_2.6.4.bb
index fa8c0fb6fd..0507d4e300 100644
--- a/meta/recipes-devtools/flex/flex_2.6.4.bb
+++ b/meta/recipes-devtools/flex/flex_2.6.4.bb
@@ -36,6 +36,11 @@  inherit autotools gettext texinfo ptest github-releases
 M4 = "${bindir}/m4"
 M4:class-native = "${STAGING_BINDIR_NATIVE}/m4"
 EXTRA_OECONF += "ac_cv_path_M4=${M4} ac_cv_func_reallocarray=no"
+# Don't let autoconf smarts to detect C standard, flex code does not need C23
+# which is what it will enforce see
+# https://savannah.gnu.org/support/index.php?111401
+CACHED_CONFIGUREVARS:append:toolchain-clang = " CFLAGS='${CFLAGS} -std=gnu17'"
+
 EXTRA_OEMAKE += "m4=${STAGING_BINDIR_NATIVE}/m4"
 
 EXTRA_OEMAKE += "${@bb.utils.contains('PTEST_ENABLED', '1', 'FLEX=${STAGING_BINDIR_NATIVE}/flex', '', d)}"