---
doc/extern-inline.texi | 5 +++++
m4/extern-inline.m4 | 10 ++++++----
2 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/doc/extern-inline.texi b/doc/extern-inline.texi
index 89e603ff18..c0c5142d80 100644
--- a/doc/extern-inline.texi
+++ b/doc/extern-inline.texi
@@ -97,6 +97,11 @@ extern inline
Use @code{AAA_FOO_INLINE} for the functions defined in @file{aaa-foo.c},
and use @code{AAA_BAR_INLINE} for the functions defined in @file{aaa-bar.c}.
+Functions defined in this way should not refer to identifiers with
+static linkage, as C99 through C23 prohibit this.
+Although a future C standard will likely relax this restriction,
+it is still an issue on many practical platforms.
+
@findex _GL_INLINE
@code{_GL_INLINE} is a portable alternative to C99 plain @code{inline}.
diff --git a/m4/extern-inline.m4 b/m4/extern-inline.m4
index 0ebcba3475..820fbda5dd 100644
--- a/m4/extern-inline.m4
+++ b/m4/extern-inline.m4
@@ -1,5 +1,5 @@
# extern-inline.m4
-# serial 1
+# serial 2
dnl Copyright 2012-2025 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -43,9 +43,11 @@ AC_DEFUN([gl_EXTERN_INLINE]
functions or macros in standard C headers like <ctype.h>. For example,
if isdigit is mistakenly implemented via a static inline function,
a program containing an extern inline function that calls isdigit
- may not work since the C standard prohibits extern inline functions
- from calling static functions (ISO C 99 section 6.7.4.(3).
- This bug is known to occur on:
+ may not work since C99 through C23 prohibit extern inline functions
+ from calling static functions (ISO C 23 section 6.7.5.(2)).
+ Although a future C standard will likely relax this restriction
+ <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3622.txt>,
+ respect it for now. This bug is known to occur on:
OS X 10.8 and earlier; see:
https://lists.gnu.org/r/bug-gnulib/2012-12/msg00023.html
--
2.51.0
