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cord
Guru
Joined: 28 Apr 2007
Posts: 304
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 Posted: Mon Apr 24, 2017 11:44 am Post subject: What flags do you suggest for two CPUs? |
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Hello, I have two hosts at LAN. First is:
| Code: | Intel(R) Core(TM) i5-2410M
CPU_FLAGS_X86="avx mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" |
and the second is:
| Code: | Intel(R) Celeron(R) CPU N3050
CPU_FLAGS_X86="aes mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" |
I want portage to use binary packages from the first host for the second. So I need some "shared" values for CFLAGS and CPU_FLAGS_X86, right?
Which do you suggest? |
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Perfect Gentleman
l33t
Joined: 18 May 2014
Posts: 881
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| Posted: Mon Apr 24, 2017 12:03 pm Post subject: |
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| Code: | | CPU_FLAGS_X86="mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" |
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cord
Guru
Joined: 28 Apr 2007
Posts: 304
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| Posted: Mon Apr 24, 2017 1:58 pm Post subject: |
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| Ok, what about CFLAGS ? I mean '-march' |
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Jaglover
Watchman
Joined: 29 May 2005
Posts: 7328
Location: Saint Amant, Acadiana
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| Posted: Mon Apr 24, 2017 2:24 pm Post subject: |
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| Code: | | gcc -march=native -E -v - </dev/null 2>&1 | grep cc1 |
Leave out everything that is not supported by second CPU.
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fedeliallalinea
Bodhisattva
Joined: 08 Mar 2003
Posts: 22668
Location: here
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| Posted: Mon Apr 24, 2017 2:37 pm Post subject: |
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| cord wrote: | | Ok, what about CFLAGS ? |
Not sure but I think (never tested)
| man gcc wrote: | | Where none of -mtune=, -mcpu= or -march= are specified, the code is tuned to perform well across a range of target processors. |
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