[committed] libstdc++: Fix declaration of posix_memalign for freestanding

[Jonathan Wakely]

Tested x86_64-linux with --disable-hosted-libstdcxx where it is needed
to fix the build.

Pushed to trunk, backports needed too.

-- >8 --

Thanks to Jérôme Duval for noticing this.

libstdc++-v3/ChangeLog:

        * libsupc++/new_opa.cc [!_GLIBCXX_HOSTED]: Fix declaration of
        posix_memalign.
---
 libstdc++-v3/libsupc++/new_opa.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/libsupc++/new_opa.cc 
b/libstdc++-v3/libsupc++/new_opa.cc
index 35606e1c1b3..c7c7e794623 100644
--- a/libstdc++-v3/libsupc++/new_opa.cc
+++ b/libstdc++-v3/libsupc++/new_opa.cc
@@ -47,7 +47,7 @@ using std::size_t;
 extern "C"
 {
 # if _GLIBCXX_HAVE_POSIX_MEMALIGN
-  void *posix_memalign(void **, size_t alignment, size_t size);
+  int posix_memalign(void **, size_t alignment, size_t size);
 # elif _GLIBCXX_HAVE_ALIGNED_ALLOC
   void *aligned_alloc(size_t alignment, size_t size);
 # elif _GLIBCXX_HAVE__ALIGNED_MALLOC
-- 
2.45.1