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Prevent internal aligned_alloc clashing with libc version

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If configure fails to detect aligned_alloc we will try to define our
own in new_opa.cc but that could clash with the libcversion in
<stdlib.h>. Use a namespace to keep them distinct.

	* libsupc++/new_opa.cc (aligned_alloc): Declare inside namespace to
	avoid clashing with an ::aligned_alloc function that was not detected
	by configure.

From-SVN: r263409
This commit is contained in:
Jonathan Wakely 2018-08-08 16:16:43 +01:00 committed by Jonathan Wakely
parent 8e09a12f01
commit a801991954
2 changed files with 24 additions and 10 deletions
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4
libstdc++-v3/ChangeLog
View File

@ -1,5 +1,9 @@
2018-08-08 Jonathan Wakely <jwakely@redhat.com>
* libsupc++/new_opa.cc (aligned_alloc): Declare inside namespace to
avoid clashing with an ::aligned_alloc function that was not detected
by configure.
* doc/xml/manual/using.xml: Fix markup for empty table entry.
* doc/html/*: Regenerate.

30
libstdc++-v3/libsupc++/new_opa.cc
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@ -25,15 +25,30 @@
#include <bits/c++config.h>
#include <stdlib.h>
#include <stdint.h>
#include <bits/exception_defines.h>
#include "new"
#if !_GLIBCXX_HAVE_ALIGNED_ALLOC && !_GLIBCXX_HAVE__ALIGNED_MALLOC \
&& !_GLIBCXX_HAVE_POSIX_MEMALIGN && _GLIBCXX_HAVE_MEMALIGN
# if _GLIBCXX_HOSTED && __has_include(<malloc.h>)
// Some C libraries declare memalign in <malloc.h>
# include <malloc.h>
# else
extern "C" void *memalign(std::size_t boundary, std::size_t size);
# endif
#endif
using std::new_handler;
using std::bad_alloc;
#if !_GLIBCXX_HAVE_ALIGNED_ALLOC
#if _GLIBCXX_HAVE__ALIGNED_MALLOC
#define aligned_alloc(al,sz) _aligned_malloc(sz,al)
namespace __gnu_cxx {
#if _GLIBCXX_HAVE_ALIGNED_ALLOC
using ::aligned_alloc;
#elif _GLIBCXX_HAVE__ALIGNED_MALLOC
static inline void*
aligned_alloc (std::size_t al, std::size_t sz)
{ return _aligned_malloc(sz, al); }
#elif _GLIBCXX_HAVE_POSIX_MEMALIGN
static inline void*
aligned_alloc (std::size_t al, std::size_t sz)
@ -49,11 +64,6 @@ aligned_alloc (std::size_t al, std::size_t sz)
return nullptr;
}
#elif _GLIBCXX_HAVE_MEMALIGN
#if _GLIBCXX_HOSTED
#include <malloc.h>
#else
extern "C" void *memalign(std::size_t boundary, std::size_t size);
#endif
static inline void*
aligned_alloc (std::size_t al, std::size_t sz)
{
@ -66,7 +76,6 @@ aligned_alloc (std::size_t al, std::size_t sz)
return memalign (al, sz);
}
#else // !HAVE__ALIGNED_MALLOC && !HAVE_POSIX_MEMALIGN && !HAVE_MEMALIGN
#include <stdint.h>
// The C library doesn't provide any aligned allocation functions, define one.
// This is a modified version of code from gcc/config/i386/gmm_malloc.h
static inline void*
@ -87,7 +96,7 @@ aligned_alloc (std::size_t al, std::size_t sz)
return aligned_ptr;
}
#endif
#endif
} // namespace __gnu_cxx
_GLIBCXX_WEAK_DEFINITION void *
operator new (std::size_t sz, std::align_val_t al)
@ -116,6 +125,7 @@ operator new (std::size_t sz, std::align_val_t al)
sz += align - rem;
#endif
using __gnu_cxx::aligned_alloc;
while (__builtin_expect ((p = aligned_alloc (align, sz)) == 0, false))
{
new_handler handler = std::get_new_handler ();