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configure --enable-optimizations with clang *12* fails to detect llvm-profdata #91296

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OfekShilon mannequin opened this issue Mar 28, 2022 · 2 comments
Open

configure --enable-optimizations with clang *12* fails to detect llvm-profdata #91296

OfekShilon mannequin opened this issue Mar 28, 2022 · 2 comments
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3.11 only security fixes build The build process and cross-build

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@OfekShilon
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OfekShilon mannequin commented Mar 28, 2022

BPO 47140
Nosy @OfekShilon

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2022-03-28.10:46:47.543>
labels = ['build', '3.11']
title = 'configure --enable-optimizations with clang *12* fails to detect llvm-profdata'
updated_at = <Date 2022-03-28.10:46:47.543>
user = 'https://github.com/OfekShilon'

bugs.python.org fields:

activity = <Date 2022-03-28.10:46:47.543>
actor = 'ofekshilon'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build']
creation = <Date 2022-03-28.10:46:47.543>
creator = 'ofekshilon'
dependencies = []
files = []
hgrepos = []
issue_num = 47140
keywords = []
message_count = 1.0
messages = ['416156']
nosy_count = 1.0
nosy_names = ['ofekshilon']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue47140'
versions = ['Python 3.11']
@OfekShilon
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OfekShilon mannequin commented Mar 28, 2022

Working on 3/228/2022 github trunk in Ubuntu20. If I use the shipped clang10 :
$ ./configure --enable-optimizations
succeeds. If however I -
$ export CC=clang-12
configure starts to fail with symptoms identical to https://bugs.python.org/issue36002:

checking for --enable-optimizations... yes
checking for --with-lto... no
checking for -llvm-profdata... no
configure: error: llvm-profdata is required for a --enable-optimizations build but could not be found.

Manually setting LLVM_PROFDATA is still a valid workaround.

@OfekShilon OfekShilon mannequin added 3.11 only security fixes build The build process and cross-build labels Mar 28, 2022
@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
@acepaceNS
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This shows with with llvm-ar as well, fixed with LLVM_AR.
It seems it searches only for the default binary names.

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