| msg274984 - (view) |
Author: Gregory P. Smith (gregory.p.smith) *  |
Date: 2016-09-08 07:45 |
| The error message you will see when building may look something like: clang -pthread -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fprofile-instr-generate -flto Parser/acceler.o Parser/grammar1.o Parser/listnode.o Parser/node.o Parser/parser.o Parser/bitset.o Parser/metagrammar.o Parser/firstsets.o Parser/grammar.o Parser/pgen.o Objects/obmalloc.o Python/dynamic_annotations.o Python/mysnprintf.o Python/pyctype.o Parser/tokenizer_pgen.o Parser/printgrammar.o Parser/parsetok_pgen.o Parser/pgenmain.o -lpthread -ldl -lutil -o Parser/pgen /usr/bin/ld: /usr/lib/llvm-3.8/bin/../lib/LLVMgold.so: error loading plugin: /usr/lib/llvm-3.8/bin/../lib/LLVMgold.so: cannot open shared object file: No such file or directory clang: error: linker command failed with exit code 1 (use -v to see invocation) Makefile:793: recipe for target 'Parser/pgen' failed make[2]: *** [Parser/pgen] Error 1 as seen on ubuntu 16.04. Related to https://bugs.launchpad.net/ubuntu/+source/llvm-toolchain-snapshot/+bug/1254970 which suggests we also need -B/usr/lib/gold-ld in our LDFLAGS and/or CFLAGS when using clang on Linux with LTO. testing with it set in both still runs into errors; someone with clang LTO experience will need to untangle this. (is this related to why --with-lto doesn't work on MacOS as well?) |
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| msg327816 - (view) |
Author: (serge-sans-paille) * |
Date: 2018-10-16 09:36 |
| Looks like a package dependency issue: installing ``llvm-dev`` package should fix the problem. Or in that particular case ``llvm-3.8-dev``. |
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| msg327817 - (view) |
Author: STINNER Victor (vstinner) * |
Date: 2018-10-16 09:41 |
| I confirm that it's currently broken. Test on Fedora 28, clang version 6.0.1 (tags/RELEASE_601/final): $ ./configure --with-pydebug CC=clang --with-lto && make (...) checking for x64 gcc inline assembler... yes checking whether float word ordering is bigendian... unknown configure: error: Unknown float word ordering. You need to manually preset ax_cv_c_float_words_bigendian=no (or yes) according to your system. |
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| msg328403 - (view) |
Author: STINNER Victor (vstinner) * |
Date: 2018-10-24 23:54 |
| New changeset 5ad36f9b21a3aa3b2265b1b43d73522cc3322df2 by Victor Stinner (serge-sans-paille) in branch 'master': bpo-28015: Support LTO build with clang (GH-9908) https://github.com/python/cpython/commit/5ad36f9b21a3aa3b2265b1b43d73522cc3322df2 |
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| msg328405 - (view) |
Author: miss-islington (miss-islington) |
Date: 2018-10-25 00:32 |
| New changeset 69a3f153a92fd8c86080e8da477ee50df18fc0d1 by Miss Islington (bot) in branch '3.7': bpo-28015: Support LTO build with clang (GH-9908) https://github.com/python/cpython/commit/69a3f153a92fd8c86080e8da477ee50df18fc0d1 |
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| msg328826 - (view) |
Author: STINNER Victor (vstinner) * |
Date: 2018-10-29 13:39 |
| The issue has been fixed in Python 3.7 and master. If someone is volunteer to backport it to older version, please go ahead :-) But according to serge-sans-paille, it's non trivial and I'm not sure that it's worth it. Sorry, usually we focus on the master branch for "new features". https://github.com/python/cpython/pull/9908#issuecomment-433896161 So I close the issue. Thanks serge-sans-paille for this nice enhancement! |
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| msg329002 - (view) |
Author: Charalampos Stratakis (cstratak) * |
Date: 2018-10-31 17:45 |
| The issue with the 3.6 branch is https://bugs.python.org/issue31625 which hasn't been backported to 3.6. Would it make sense to backport it? I have the backports ready locally but not sure if pushing https://bugs.python.org/issue31625 to 3.6 is desirable. |
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| msg329042 - (view) |
Author: Benjamin Peterson (benjamin.peterson) * |
Date: 2018-11-01 04:39 |
| Probably that's fine, but can #31625 be easily worked around by, e.g., using make AR=llvm-ar RANLIB=llvm-ranlib? |
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| msg329421 - (view) |
Author: Charalampos Stratakis (cstratak) * |
Date: 2018-11-07 15:55 |
| The workaround indeed works. |
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| msg331414 - (view) |
Author: Ned Deily (ned.deily) * |
Date: 2018-12-09 08:08 |
| New changeset f83ee476d48dbeb90ddf3526b04936a49a87973a by Ned Deily (stratakis) in branch '3.6': bpo-28015: Support LTO build with clang (GH-9908) (GH-10922) https://github.com/python/cpython/commit/f83ee476d48dbeb90ddf3526b04936a49a87973a |
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| msg331415 - (view) |
Author: Ned Deily (ned.deily) * |
Date: 2018-12-09 08:14 |
| See also Issue31354, Issue35351, and Issue35257. |
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