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if you're using an intel core2 processor, the proper -march setting is |
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-march=nocona |
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On Tue, 01 Dec 2009 14:26:28 +0100, Roger Mason <rmason@×××.ca> wrote: |
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|
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> Hello, |
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> |
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> I need to build gcc 4.2 on a core 2 duo system. The only 4.2.x version |
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> is 4.2.4, which is masked by ~. When I try to build it fails: |
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> |
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> ... |
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> /var/tmp/portage/sys-devel/gcc-4.2.4-r1/work/build/./gcc/xgcc |
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> -B/var/tmp/portage/sys-devel/gcc-4.2.4-r1/work/build/./gcc/ |
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> -B/usr/x86_64-pc-linux-gnu/bin/ -B/usr/x86_64-pc-linux-gnu/lib/ -isystem |
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> /usr/x86_64-pc-linux-gnu/include -isystem |
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> /usr/x86_64-pc-linux-gnu/sys-include -O2 -O2 -O2 -march=core2 -pipe |
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> -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes |
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> -Wmissing-prototypes -Wold-style-definition -isystem ./include -fPIC |
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> -g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -msse -c \ |
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> /var/tmp/portage/sys-devel/gcc-4.2.4-r1/work/gcc-4.2.4/gcc/config/i386/crtfastmath.c |
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> \ |
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> -o crtfastmath.o |
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> /var/tmp/portage/sys-devel/gcc-4.2.4-r1/work/gcc-4.2.4/gcc/config/i386/crtfastmath.c:1: |
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> error: bad value (core2) for -march= switch |
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> /var/tmp/portage/sys-devel/gcc-4.2.4-r1/work/gcc-4.2.4/gcc/config/i386/crtfastmath.c:1: |
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> error: bad value (core2) for -mtune= switch |
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> |
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> I do indeed have -march=core2 in /etc/make.conf. I suppose I could |
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> change -march= to something else and try again - but what should I |
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> change it to? gcc-4.2.4 would only be used for non-portage compiling |
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> so, am I right in thinking that after it is built it would be safe to |
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> revert to -march=core2? |
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> |
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> Thanks, |
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> Roger |
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> |
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