The function alloca (for cygwin/mingw target _alloca) is broken or not
available (for linux64), when using option -fno-builtin.
The linux and win32 targets the symbol alloca isn't present. For windows
targets there is an implementation (_alloca) in gcc/config/i386/cygwin.asm
present. But when using this, the stack layout is broken after calling alloca.
The attached example shows the failure for i?86 and x86_64 windows targets
pretty well.
--
Summary: alloca broken for -fno-builtin
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ktietz at gcc dot gnu dot org
GCC host triplet: x86_64-pc-linux
GCC target triplet: x86_64-*-* i686-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41001
