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On GCC C++20, formatting std::string using core.h, then including format.h, causes partial specialization error #2769
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nyanpasu64
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Feb 16, 2022
Fixed in a1ea3e0, thanks for reporting. |
Out of curiosity, why does the error only occur on GCC C++20 mode? |
I'm not sure why it only happens in C++20. |
facebook-github-bot
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Summary: Workaround a compilation issue on C++20 by switching from `fmt::string_view` to `boost::string_view`. A proper fix (fmtlib/fmt#2769) will be backported separately. Differential Revision: D37076763 fbshipit-source-id: d8001bdcd65ee9edf1f265e3aaf281c196e4d155
facebook-github-bot
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Summary: Backport a fix to fmtlib/fmt#2769. Reviewed By: aandreyeu Differential Revision: D37077479 fbshipit-source-id: 6f9d716c47784717c4aa36eba89498639eb3503a
EduardoCostaom
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Summary: Backport a fix to fmtlib/fmt#2769. Reviewed By: aandreyeu Differential Revision: D37077479 fbshipit-source-id: 6f9d716c47784717c4aa36eba89498639eb3503a
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After upgrading from fmtlib 7.1.3 to 8.1.1, I started getting a mysterious compilation error on Arch Linux GCC 11.2.0 C++20 (but no error on Clang 13.0.1):
Annoyingly, this error doesn't point to where the concrete formatter was instantiated.
A minimal test case for this behavior is as follows:
The error can be reproduced using
g++ -std=gnu++20 fmt-err.cpp
andc++20
, but notgnu++17
and below, and not usingclang++
withgnu++20
orgnu++17
.Is this intended to function properly? (I should probably stop using fmtlib in my headers... it's rather sloppy on my part.)
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