Building a testdir for 'isalnum_l' on CentOS 5, I see this link error:
g++ -Wno-error -g -O2 -o test-stdlib-h-c++ test-stdlib-h-c++.o
test-stdlib-h-c++2.o libtests.a ../gllib/libgnu.a libtests.a ../gllib/libgnu.a
libtests.a
test-stdlib-h-c++.o: In function `__static_initialization_and_destruction_0':
/home/bruno/testdir1/build-64/gltests/../../gltests/test-stdlib-h-c++.cc:166:
undefined reference to `rpl_realloc(void*, unsigned long)'
collect2: ld returned 1 exit status
make[4]: *** [test-stdlib-h-c++] Error 1
The cause is that test-stdlib-h-c++.o needs the symbol rpl_realloc with C++
linkage; however, realloc.o defines the symbol rpl_realloc with C linkage.
This patch fixes it.
2025-02-16 Bruno Haible <br...@clisp.org>
realloc: Fix link error in C++ mode on CentOS 5 (regression 2024-11-04).
* lib/stdlib.in.h (rpl_realloc): Ensure C linkage, not C++ linkage, in
C++ mode.
diff --git a/lib/stdlib.in.h b/lib/stdlib.in.h
index 11d337a18a..2077a63fc6 100644
--- a/lib/stdlib.in.h
+++ b/lib/stdlib.in.h
@@ -1473,11 +1473,17 @@ _GL_WARN_ON_USE (setstate_r, "setstate_r is unportable
- "
# if @REPLACE_REALLOC_FOR_REALLOC_POSIX@
# if @REPLACE_REALLOC_FOR_REALLOC_POSIX@ == 2
# define _GL_INLINE_RPL_REALLOC 1
+# ifdef __cplusplus
+extern "C" {
+# endif
_GL_REALLOC_INLINE void *
rpl_realloc (void *ptr, size_t size)
{
return realloc (ptr, size ? size : 1);
}
+# ifdef __cplusplus
+}
+# endif
# endif
# if !((defined __cplusplus && defined GNULIB_NAMESPACE) \
|| _GL_USE_STDLIB_ALLOC)
