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buildflags.md: Document downstream build flags 

Related: #2005080
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Florian Weimer 2021-11-16 17:57:16 +01:00
parent 4358269192
commit 4e35bb887b
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@ -438,14 +438,15 @@ tuning in the `gcc` package. These settings are:
point math to avoid excess precision issues. `-mstackrealign` point math to avoid excess precision issues. `-mstackrealign`
avoids relying on the stack alignment guaranteed by the current avoids relying on the stack alignment guaranteed by the current
version of the i386 ABI. version of the i386 ABI.
* **ppc64le**: `-mcpu=power8 -mtune=power8` selects a minimum supported * **ppc64le**: `-mcpu=power9 -mtune=power9` selects a minimum supported
CPU level of POWER8 (the first CPU with ppc64le support) and tunes CPU level of POWER9.
for POWER8. * **s390x**: `-march=z14 -mtune=z15` specifies a minimum supported CPU
* **s390x**: `-march=zEC12 -mtune=z13` specifies a minimum supported CPU level of z14, while optimizing for a subsequent CPU generation
level of zEC12, while optimizing for a subsequent CPU generation (z15).
(z13). * **x86_64**: `-march=x86-64-v2 -mtune=generic` builds for the
* **x86_64**: `-mtune=generic` selects tuning which is expected to [x86-64-v2 micro-architecture level](https://gitlab.com/x86-psABIs/x86-64-ABI/-/blob/master/x86-64-ABI/low-level-sys-info.tex)
beneficial for a broad range of current CPUs. and selects tuning which is expected to beneficial for a broad range
of current CPUs.
* **aarch64** does not have any architecture-specific tuning. * **aarch64** does not have any architecture-specific tuning.
# Individual linker flags # Individual linker flags