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| author | Paul Eggert <eggert@cs.ucla.edu> | 2021-01-21 13:40:16 -0800 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2021-01-21 17:09:58 -0800 |
| commit | 605e20a698d3f7296cda18ac7dd84b1a8f388b50 (patch) | |
| tree | 1e175acc33337e6fb6f29e8e0e7c2eb310c340a7 /m4 | |
| parent | 65f62234c816cae5a0f42fc02c9edb94b5a2f72a (diff) | |
| download | gnulib-605e20a698d3f7296cda18ac7dd84b1a8f388b50.tar.gz | |
Port FALLTHROUGH to clang 3.4 and earlier
Problem reported by Akim Demaille in:
https://lists.gnu.org/r/bug-gnulib/2021-01/msg00241.html
* lib/cdefs.h (__glibc_has_attribute):
* m4/gnulib-common.m4 (gl_COMMON_BODY):
Do not trust __has_attribute in clang 3.4 and earlier, as
<https://releases.llvm.org/3.5.0/tools/clang/docs/ReleaseNotes.html>
says that __has_attribute is unreliable in these old versions.
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/gnulib-common.m4 | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/m4/gnulib-common.m4 b/m4/gnulib-common.m4 index 3d87fd840a..f2eff10de6 100644 --- a/m4/gnulib-common.m4 +++ b/m4/gnulib-common.m4 @@ -67,7 +67,9 @@ AC_DEFUN([gl_COMMON_BODY], [ #endif]) AH_VERBATIM([attribute], [/* Attributes. */ -#ifdef __has_attribute +#if (defined __has_attribute \ + && (!defined __clang_minor__ \ + || 3 < __clang_major__ + (5 <= __clang_minor__))) # define _GL_HAS_ATTRIBUTE(attr) __has_attribute (__##attr##__) #else # define _GL_HAS_ATTRIBUTE(attr) _GL_ATTR_##attr |