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authorDenys Vlasenko <vda.linux@googlemail.com>2010-11-02 07:24:50 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2010-11-02 07:24:50 +0100
commitfff9dae7eb2e9e9a81f73a955d921e7f0e1e9bb5 (patch)
treedb2dbfe3566ae8e0efa217702e346ccbc43362d9 /docs/wchar_and_locale.txt
parent4d537e8547b8d623e1847cd80d3da455dc52ff85 (diff)
ldouble_wrappers: remove i386-specific optimization
It is deemed too unsafe. Quoting Timo: If I'm building with "-fPIC -pg" it instruments all C functions with profiler stuff which is called via PLT and causes EBX reloads --> crash -fno-omit-frame-pointer is sometimes useful for profiling too --> crash Also the upcoming -fsplit-stack will be broken by this too (that might need additional uclibc support though). And I'm pretty sure there's also other similar compiler features. There's no predefined #defines in gcc for any of these. What I'm trying to say that there are *numerous* situations when the compiler can create stack frame for you without you ever knowing it. And if you want to do a tail jump, you really should be doing it from .S file where you control fully the prologue/epilogue code. (GCC naked attribute does not seem to work on x86.) Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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