[gcc r13-8849] libstdc++: Fix declaration of posix_memalign for freestanding

[Jonathan Wakely]

https://gcc.gnu.org/g:24dbdd20dcbd4c560f852cce51aa0754464476f5

commit r13-8849-g24dbdd20dcbd4c560f852cce51aa0754464476f5
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Jun 14 12:10:48 2024 +0100

    libstdc++: Fix declaration of posix_memalign for freestanding
    
    Thanks to Jérôme Duval for noticing this.
    
    libstdc++-v3/ChangeLog:
    
            * libsupc++/new_opa.cc [!_GLIBCXX_HOSTED]: Fix declaration of
            posix_memalign.
    
    (cherry picked from commit 161efd677458f20d13ee1018a4d5e3964febd508)

Diff:
---
 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 29767c1cfaad..3c06b5c0bcf3 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