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Until recently 'native' was implicitly included via 'orcjit', but a change
included in LLVM 11 (not yet released) removed a number of such indirect
component references.
Reported-By: Fabien COELHO <coelho@cri.ensmp.fr>
Reported-By: Andres Freund <andres@anarazel.de>
Reported-By: Thomas Munro <thomas.munro@gmail.com>
Author: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20201201064949.mex6kvi2kygby3ni@alap3.anarazel.de
Backpatch: 11-, where jit support was added
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The comment marker "#" is copied to the output, so it's only
appropriate for comments that make sense in the shell output. For
comments about the Autoconf language, "dnl" should be used.
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Calling AC_CHECK_DECLS before we've finished setting up the compiler's
CFLAGS seems like a pretty risky proposition, especially now that the
first use of that macro will result in a test to see whether the compiler
gives warning or error for undeclared built-in functions. That answer
could very easily get changed later than where PGAC_LLVM_SUPPORT is
called; furthermore, it's hardly unlikely that flags such as -D_GNU_SOURCE
could change visibility of declarations. Hence, be a little less cavalier
about where to do LLVM-related tests. This results in v11 and HEAD doing
the warning-or-error check at the same place in the script as older
branches are doing it, which seems like a good thing.
Per further thought about commits 0b59b0e8b and 16fbac39f.
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Before this commit LLVM 7 was supported, but only if one explicitly
provided LLVM_CONFIG= and CLANG= paths. As LLVM 7 is the first
version that includes our upstreamed debugging and profiling features,
and as debian is planning to default to 7 due to wider architecture
support, it seems good to support auto-detecting that version.
Author: Christoph Berg
Discussion: https://postgr.es/m/20180912124517.GD24584@msg.df7cb.de
Backpatch: 11, where LLVM was introduced
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Noticed thanks to buildfarm animal seawasp.
Author: Andres Freund
Backpatch: v11-, where LLVM based JIT compliation was introduced.
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During the work of upstreaming my previous patches for gdb and perf
support the API changed. Adapt. Normally this wouldn't necessarily be
something to backpatch, but the previous API wasn't upstream, and at
least the gdb support is quite useful for debugging.
Author: Andres Freund
Backpatch: 11, where LLVM based JIT support was added.
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LLVM will be used for *optional* Just-in-time compilation
support. This commit just adds the configure infrastructure that
detects LLVM.
No documentation has been added for the --with-llvm flag, that'll be
added after the actual supporting code has been added.
Author: Andres Freund
Discussion: https://postgr.es/m/20170901064131.tazjxwus3k2w3ybh@alap3.anarazel.de
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