public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "enolan at alumni dot cmu.edu" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/107255] New: ation and definition of a template function which vary in use of concept auto syntax are interpreted as ambiguous overloadsdeclar Date: Fri, 14 Oct 2022 01:40:39 +0000 [thread overview] Message-ID: <bug-107255-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107255 Bug ID: 107255 Summary: ation and definition of a template function which vary in use of concept auto syntax are interpreted as ambiguous overloadsdeclar Product: gcc Version: 12.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: enolan at alumni dot cmu.edu Target Milestone: --- This is a rejects-valid bug where GCC has trouble determining that a declaration and definition which vary only in their use of concept auto syntax are for the same function and not multiple ambiguous overloads. Compiler explorer link: https://godbolt.org/z/4Tjcz49d9 Minimal reproduction: template <typename T> concept Foo = true; void bar(Foo auto); template <Foo F> void bar(F) {} void baz() { bar(0); } > the exact version of GCC gcc version 12.2.1 20220819 (Red Hat 12.2.1-2) (GCC) > the system type Fedora release 38 (Rawhide) > the options given when GCC was configured/built Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --enable-libstdcxx-backtrace --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-12.2.1-20220819/obj-x86_64-redhat-linux/isl-install --enable-offload-targets=nvptx-none --without-cuda-driver --enable-offload-defaulted --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux --with-build-config=bootstrap-lto --enable-link-serialization=1 > the complete command line that triggers the bug g++ -std=c++20 poc.cpp > the compiler output poc.cpp: In function ‘void baz()’: poc.cpp:10:8: error: call of overloaded ‘bar(int)’ is ambiguous 10 | bar(0); | ~~~^~~ poc.cpp:4:6: note: candidate: ‘void bar(auto:1) [with auto:1 = int]’ 4 | void bar(Foo auto); | ^~~ poc.cpp:7:6: note: candidate: ‘void bar(F) [with F = int]’ 7 | void bar(F) {} | ^~~
next reply other threads:[~2022-10-14 1:40 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-10-14 1:40 enolan at alumni dot cmu.edu [this message] 2022-10-15 7:00 ` [Bug c++/107255] declaration and definition of a template function which vary in use of concept auto syntax are interpreted as ambiguous overloads de34 at live dot cn 2022-10-15 13:33 ` redi at gcc dot gnu.org
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=bug-107255-4@http.gcc.gnu.org/bugzilla/ \ --to=gcc-bugzilla@gcc.gnu.org \ --cc=gcc-bugs@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).