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Merge branch 'clang-wno-profile-instr-unprofile'

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Daniel Eklöf 2020-12-21 13:01:11 +01:00
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9
INSTALL.md
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@ -142,6 +142,10 @@ optimization.
In addition to being faster, PGO builds also tend to be smaller than
regular `-O3` builds.
**Note**: if you are packaging foot, you should probably remove
`-march=native`, as that may cause gcc/clang to emit instructions that
may not be available on other computers.
#### Size optimized
@ -186,7 +190,10 @@ later have a regression where PGO with `-O2` is **much** slower.
If you are using Clang instead of GCC, use the following `CFLAGS` instead:
```sh
export CFLAGS="$CFLAGS -O3 -march=native -Wno-ignored-optimization-argument -Wno-profile-instr-out-of-date"
export CFLAGS="$CFLAGS -O3 -march=native \
-Wno-ignored-optimization-argument \
-Wno-profile-instr-out-of-date \
-Wno-profile-instr-unprofiled"
```
Then, tell meson we want to _generate_ profiling data, and build: