https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97097
Bug ID: 97097 Summary: operator() call from lambda fails to resolve to enclosing class function Product: gcc Version: 11.0 Status: UNCONFIRMED Keywords: wrong-code Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: hstong at ca dot ibm.com Target Milestone: --- In the code below, GCC does not appear to perform the applicable lookup in the appropriate class scope to resolve the reference to the `operator()` in the enclosing class. It seems that, somehow, GCC resolved the `operator()` to the member of the closure class, resulting in infinite recursion. ### SOURCE (<stdin>): extern "C" int printf(const char *, ...); struct A { void f(); void operator()(int) { printf("Hello, world!"); } }; void A::f() { const auto &f = [this](auto x) -> void { operator()(x); }; f(0); } int main(void) { A a; a.f(); } ### COMPILER INVOCATION: g++ -std=c++14 -Wall -Wextra -pedantic-errors -o a.out -xc++ - ### ACTUAL RUN OUTPUT: (program abend) ### EXPECTED RUN OUTPUT: Hello, world! ### COMPILER VERSION INFO (g++ -v): Using built-in specs. COLLECT_GCC=/opt/wandbox/gcc-head/bin/g++ COLLECT_LTO_WRAPPER=/opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/11.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../source/configure --prefix=/opt/wandbox/gcc-head --enable-languages=c,c++ --disable-multilib --without-ppl --without-cloog-ppl --enable-checking=release --disable-nls --enable-lto LDFLAGS=-Wl,-rpath,/opt/wandbox/gcc-head/lib,-rpath,/opt/wandbox/gcc-head/lib64,-rpath,/opt/wandbox/gcc-head/lib32 Thread model: posix Supported LTO compression algorithms: zlib gcc version 11.0.0 20200917 (experimental) (GCC)