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Make sure alloca is called even when optimizing, fully init _REENT

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Signed-off by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2016-07-27 13:52:10 +02:00
parent d7281b92ab
commit 8f1378b19f
1 changed files with 7 additions and 3 deletions
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10
winsup/cygwin/init.cc
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@ -70,6 +70,10 @@ munge_threadfunc ()
void dll_crt0_0 (); void dll_crt0_0 ();
/* Non-static fake variable so GCC doesn't second-guess if we *really*
need the alloca'd space in the DLL_PROCESS_ATTACH case below... */
void *alloca_dummy;
extern "C" BOOL WINAPI extern "C" BOOL WINAPI
dll_entry (HANDLE h, DWORD reason, void *static_load) dll_entry (HANDLE h, DWORD reason, void *static_load)
{ {
@ -85,12 +89,12 @@ dll_entry (HANDLE h, DWORD reason, void *static_load)
/* Starting with adding the POSIX-1.2008 per-thread locale functionality, /* Starting with adding the POSIX-1.2008 per-thread locale functionality,
we need an initalized _REENT area even for the functions called from we need an initalized _REENT area even for the functions called from
dll_crt0_0. In fact, we only need the _REENT->_locale pointer dll_crt0_0. Most importantly, we need the _REENT->_locale pointer
initialized to NULL, so subsequent calls to locale-specific functions initialized to NULL, so subsequent calls to locale-specific functions
will always fall back to __global_locale, rather then crash due to will always fall back to __global_locale, rather then crash due to
_REENT->_locale having an arbitrary value. */ _REENT->_locale having an arbitrary value. */
(void) alloca (CYGTLS_PADSIZE); alloca_dummy = alloca (CYGTLS_PADSIZE);
_REENT->_locale = NULL; memcpy (_REENT, _GLOBAL_REENT, sizeof (struct _reent));
dll_crt0_0 (); dll_crt0_0 ();
_my_oldfunc = TlsAlloc (); _my_oldfunc = TlsAlloc ();