New submission from marxin:
I've just tried to build Python with {C,CXX,LD}FLAGS set to '-flto'.
Unfortunately following conftest source file is fragile:
cat /tmp/mc.c
int
main ()
{
unsigned int fpcr;
__asm__ __volatile__ (fmove.l %%fpcr,%0 : =g (fpcr));
__asm__ __volatile__ (fmove.l %0,%%fpcr : : g (fpcr));
;
return 0;
}
gcc --version:
gcc (GCC) 5.1.1 20150424 (prerelease)
gcc -c /tmp/mc.c
/tmp/mc.c: Assembler messages:
/tmp/mc.c:6: Error: no such instruction: `fmove.l %fpcr,%eax'
/tmp/mc.c:7: Error: no such instruction: `fmove.l -4(%rbp),%fpcr'
gcc -flto -c /tmp/mc.c
As GCC does not produce assembly with -flto and -c (unless you append
-ffat-lto-objects), the compilation success.
Can you please write more robust configuration.
Thanks,
Martin
--
messages: 246034
nosy: mli...@suse.cz
priority: normal
severity: normal
status: open
title: Configure script wrongly detects mc68881 with -flto option passed
versions: Python 3.5
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