https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111008
Bug ID: 111008
Summary: '>' in a lambda as a template argument causes a syntax
error
Product: gcc
Version: 13.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: shin1_morita at yahoo dot co.jp
Target Milestone: ---
Created attachment 55732
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55732&action=edit
Complete code for reproducing the bug
The following code (a lambda as a template argument) produces a syntax error,
which is compiled successfully by clang or msvc:
return F<[](auto x)
{
return x > 0 ? x : 0;
}>()(0);
'>' in the lambda seems to cause the error.
A workaround is surrounding it with parentheses:
return (x > 0) ? x : 0;
See the attachment for complete code.
$ g++ -std=c++20 lambda.cc
lambda.cc: In lambda function:
lambda.cc:14:17: error: expected ';' before '>' token
14 | return x > 0 ? x : 0;
| ^~
| ;
lambda.cc:14:18: error: expected primary-expression before '>' token
14 | return x > 0 ? x : 0;
| ^
$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/13.2.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure
--enable-languages=ada,c,c++,d,fortran,go,lto,objc,obj-c++ --enable-bootstrap
--prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/
--with-build-config=bootstrap-lto --with-linker-hash-style=gnu
--with-system-zlib --enable-__cxa_atexit --enable-cet=auto
--enable-checking=release --enable-clocale=gnu --enable-default-pie
--enable-default-ssp --enable-gnu-indirect-function --enable-gnu-unique-object
--enable-libstdcxx-backtrace --enable-link-serialization=1
--enable-linker-build-id --enable-lto --enable-multilib --enable-plugin
--enable-shared --enable-threads=posix --disable-libssp --disable-libstdcxx-pch
--disable-werror
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.2.1 20230801 (GCC)
