Bug 1915792

clang fails to build with Python 3.10.0a4.

[341/1638] /usr/bin/g++ -DCLANG_REPOSITORY_STRING="\"Fedora 11.0.1-4.fc34\"" -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Ilib/Lex -I../lib/Lex -I../include -Iinclude -I/include -O2  -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fPIC -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -Wimplicit-fallthrough -Wno-class-memaccess -Wno-redundant-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wno-comment -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -fno-strict-aliasing -pedantic -Wno-long-long -O2 -g -DNDEBUG -std=c++14 -MD -MT lib/Lex/CMakeFiles/obj.clangLex.dir/PPMacroExpansion.cpp.o -MF lib/Lex/CMakeFiles/obj.clangLex.dir/PPMacroExpansion.cpp.o.d -o lib/Lex/CMakeFiles/obj.clangLex.dir/PPMacroExpansion.cpp.o -c ../lib/Lex/PPMacroExpansion.cpp
FAILED: lib/Lex/CMakeFiles/obj.clangLex.dir/PPMacroExpansion.cpp.o 
/usr/bin/g++ -DCLANG_REPOSITORY_STRING="\"Fedora 11.0.1-4.fc34\"" -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Ilib/Lex -I../lib/Lex -I../include -Iinclude -I/include -O2  -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fPIC -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -Wimplicit-fallthrough -Wno-class-memaccess -Wno-redundant-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wno-comment -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -fno-strict-aliasing -pedantic -Wno-long-long -O2 -g -DNDEBUG -std=c++14 -MD -MT lib/Lex/CMakeFiles/obj.clangLex.dir/PPMacroExpansion.cpp.o -MF lib/Lex/CMakeFiles/obj.clangLex.dir/PPMacroExpansion.cpp.o.d -o lib/Lex/CMakeFiles/obj.clangLex.dir/PPMacroExpansion.cpp.o -c ../lib/Lex/PPMacroExpansion.cpp
'
*** WARNING *** there are active plugins, do not report this as a bug unless you can reproduce it without enabling any plugins.
Event                            | Plugins
PLUGIN_FINISH_UNIT               | annobin: Generate final annotations
PLUGIN_START_UNIT                | annobin: Generate global annotations
PLUGIN_ALL_PASSES_START          | annobin: Generate per-function annotations
PLUGIN_ALL_PASSES_END            | annobin: Register per-function end symbols
during GIMPLE pass: uninit
In function 'void EvaluateFeatureLikeBuiltinMacro.constprop(llvm::raw_svector_ostream&, clang::Token&, clang::IdentifierInfo*, clang::Preprocessor&, llvm::function_ref<int(clang::Token&, bool&)>)':
Segmentation fault
 1286 | static void EvaluateFeatureLikeBuiltinMacro(llvm::raw_svector_ostream& OS,
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0x15ff5c9 diagnostic_impl(rich_location*, diagnostic_metadata const*, int, char const*, __va_list_tag (*) [1], diagnostic_t)
	???:0
0xfc93b7 internal_error(char const*, ...)
	???:0
0x937254 crash_signal(int)
	???:0
0x71efe9 print_mem_ref(c_pretty_printer*, tree_node*)
	???:0
0x658ac2 expr_to_string(tree_node*)
	???:0
0x6585c2 cp_printer(pretty_printer*, text_info*, char const*, int, bool, bool, bool, bool*, char const**) [clone .cold]
	???:0
0x1601da0 pp_format(pretty_printer*, text_info*)
	???:0
0x1401e43 diagnostic_report_diagnostic(diagnostic_context*, diagnostic_info*)
	???:0
0x14022cc warning_at(unsigned int, int, char const*, ...)
	???:0
0x12bf475 warn_uninit(opt_code, tree_node*, tree_node*, tree_node*, char const*, void*, unsigned int)
	???:0
0x9ec123 (anonymous namespace)::pass_late_warn_uninitialized::execute(function*) [clone .cold]
	???:0
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://bugzilla.redhat.com/bugzilla> for instructions.
Preprocessed source stored into /tmp/ccXg9jqW.out file, please attach this to your bugreport.
[342/1638] /usr/bin/g++ -DCLANG_REPOSITORY_STRING="\"Fedora 11.0.1-4.fc34\"" -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Ilib/Lex -I../lib/Lex -I../include -Iinclude -I/include -O2  -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fPIC -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -Wimplicit-fallthrough -Wno-class-memaccess -Wno-redundant-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wno-comment -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -fno-strict-aliasing -pedantic -Wno-long-long -O2 -g -DNDEBUG -std=c++14 -MD -MT lib/Lex/CMakeFiles/obj.clangLex.dir/Preprocessor.cpp.o -MF lib/Lex/CMakeFiles/obj.clangLex.dir/Preprocessor.cpp.o.d -o lib/Lex/CMakeFiles/obj.clangLex.dir/Preprocessor.cpp.o -c ../lib/Lex/Preprocessor.cpp
ninja: build stopped: subcommand failed.


According to Koschei, this is not relevant to Python 3.10:

https://koschei.fedoraproject.org/package/clang



For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.10/fedora-rawhide-x86_64/01878539-clang/

For all our attempts to build clang with Python 3.10, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/package/clang/

Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.10:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/

Let us know here if you have any questions.

Python 3.10 will be included in Fedora 35. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.10.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon.
We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.