A gnulib testdir produces a compilation error on Solaris 11 OmniOS:
In file included from /usr/include/sys/time.h:489,
from ../gllib/sys/time.h:39,
from /usr/include/sys/select.h:53,
from ../gllib/sys/select.h:36,
from /usr/include/sys/types.h:640,
from ../gllib/sys/types.h:39,
from /usr/include/malloc.h:31,
from ../gllib/malloc.h:27,
from ../../gltests/test-malloc-h-c++.cc:22:
../gllib/stdlib.h:782:1: error: 'aligned_alloc' was not declared in this scope
782 | _GL_CXXALIASWARN (aligned_alloc);
| ^~~~~~~~~~~~~~~~
../gllib/stdlib.h:782:1: note: suggested alternatives:
In file included from /usr/include/stdlib.h:42,
from /opt/gcc-9/include/c++/9.3.0/cstdlib:75,
from /opt/gcc-9/include/c++/9.3.0/stdlib.h:36,
from ../gllib/stdlib.h:36,
from ../gllib/malloc.h:35,
from ../../gltests/test-malloc-h-c++.cc:22:
/usr/include/iso/stdlib_c11.h:60:14: note: 'std::aligned_alloc'
60 | extern void *aligned_alloc(size_t, size_t);
| ^~~~~~~~~~~~~
In file included from /usr/include/sys/time.h:489,
from ../gllib/sys/time.h:39,
from /usr/include/sys/select.h:53,
from ../gllib/sys/select.h:36,
from /usr/include/sys/types.h:640,
from ../gllib/sys/types.h:39,
from /usr/include/malloc.h:31,
from ../gllib/malloc.h:27,
from ../../gltests/test-malloc-h-c++.cc:22:
../gllib/stdlib.h:769:1: note: 'gnulib::aligned_alloc'
769 | _GL_CXXALIAS_RPL (aligned_alloc, void *, (size_t alignment, size_t
size));
| ^~~~~~~~~~~~~~~~
The reason is that aligned_alloc is not declared in C++ mode, only in ISO C11
mode. This patch fixes the error:
2022-09-02 Bruno Haible <br...@clisp.org>
aligned_alloc: Fix compilation error in C++ mode on Solaris 11.
* lib/stdlib.in.h (aligned_alloc): Enable the C++ alias warning only on
glibc systems.
diff --git a/lib/stdlib.in.h b/lib/stdlib.in.h
index a86643c3ca..010875803c 100644
--- a/lib/stdlib.in.h
+++ b/lib/stdlib.in.h
@@ -226,7 +226,7 @@ _GL_FUNCDECL_SYS (aligned_alloc, void *,
_GL_CXXALIAS_SYS (aligned_alloc, void *, (size_t alignment, size_t size));
# endif
# endif
-# if @HAVE_ALIGNED_ALLOC@
+# if (__GLIBC__ >= 2) && @HAVE_ALIGNED_ALLOC@
_GL_CXXALIASWARN (aligned_alloc);
# endif
#else
