[PATCH 01/22] c: adjust _Noreturn to pedantic clang

[Akim Demaille]

Reported by Joe Nelson <j...@begriffs.com>.
https://lists.gnu.org/r/help-bison/2021-01/msg00004.html
Fixed by Paul Eggert in gnulib.
https://lists.gnu.org/r/bug-gnulib/2021-01/msg00156.html

* data/skeletons/c.m4 (b4_attribute_define): Adjust _Noreturn to
pedantic clang.
---
 data/skeletons/c.m4 | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/data/skeletons/c.m4 b/data/skeletons/c.m4
index 14a16a9d7..8c08b0a57 100644
--- a/data/skeletons/c.m4
+++ b/data/skeletons/c.m4
@@ -378,14 +378,16 @@ dnl use C' _Noreturn in C++, to avoid -Wc11-extensions 
warnings.
       && ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
           || (defined _MSC_VER && 1900 <= _MSC_VER)))
 #  define _Noreturn [[noreturn]]
-# elif (!defined __cplusplus                     \
-        && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0)  \
-            || 4 < __GNUC__ + (7 <= __GNUC_MINOR__) \
-            || (defined __apple_build_version__ \
-                ? 6000000 <= __apple_build_version__ \
-                : 3 < __clang_major__ + (5 <= __clang_minor__))))
+# elif ((!defined __cplusplus || defined __clang__) \
+        && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) \
+            || (!defined __STRICT_ANSI__ \
+                && (__4 < __GNUC__ + (7 <= __GNUC_MINOR__) \
+                    || (defined __apple_build_version__ \
+                        ? 6000000 <= __apple_build_version__ \
+                        : 3 < __clang_major__ + (5 <= __clang_minor__))))))
    /* _Noreturn works as-is.  */
-# elif 2 < __GNUC__ + (8 <= __GNUC_MINOR__) || 0x5110 <= __SUNPRO_C
+# elif (2 < __GNUC__ + (8 <= __GNUC_MINOR__) || defined __clang__ \
+        || 0x5110 <= __SUNPRO_C)
 #  define _Noreturn __attribute__ ((__noreturn__))
 # elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
 #  define _Noreturn __declspec (noreturn)
-- 
2.30.0