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* [Bug c++/111008] New: '>' in a lambda as a template argument causes a syntax error @ 2023-08-13 22:10 shin1_morita at yahoo dot co.jp 2023-08-13 22:12 ` [Bug c++/111008] " pinskia at gcc dot gnu.org ` (5 more replies) 0 siblings, 6 replies; 7+ messages in thread From: shin1_morita at yahoo dot co.jp @ 2023-08-13 22:10 UTC (permalink / raw) To: gcc-bugs 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) ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/111008] '>' in a lambda as a template argument causes a syntax error 2023-08-13 22:10 [Bug c++/111008] New: '>' in a lambda as a template argument causes a syntax error shin1_morita at yahoo dot co.jp @ 2023-08-13 22:12 ` pinskia at gcc dot gnu.org 2023-08-13 22:17 ` pinskia at gcc dot gnu.org ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-08-13 22:12 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111008 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |rejects-valid --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- The most obvious workaround is to add parentheses around `x > 0`. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/111008] '>' in a lambda as a template argument causes a syntax error 2023-08-13 22:10 [Bug c++/111008] New: '>' in a lambda as a template argument causes a syntax error shin1_morita at yahoo dot co.jp 2023-08-13 22:12 ` [Bug c++/111008] " pinskia at gcc dot gnu.org @ 2023-08-13 22:17 ` pinskia at gcc dot gnu.org 2023-08-13 22:22 ` pinskia at gcc dot gnu.org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-08-13 22:17 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111008 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Status|UNCONFIRMED |NEW Last reconfirmed| |2023-08-13 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Confirmed reduced testcase: template<bool f()>struct F{}; F<[]() { return (1 > 0); }> a; F<[]() { return 1 > 0; }> a0; The line containing a0 is rejected. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/111008] '>' in a lambda as a template argument causes a syntax error 2023-08-13 22:10 [Bug c++/111008] New: '>' in a lambda as a template argument causes a syntax error shin1_morita at yahoo dot co.jp 2023-08-13 22:12 ` [Bug c++/111008] " pinskia at gcc dot gnu.org 2023-08-13 22:17 ` pinskia at gcc dot gnu.org @ 2023-08-13 22:22 ` pinskia at gcc dot gnu.org 2023-08-13 22:44 ` pinskia at gcc dot gnu.org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-08-13 22:22 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111008 --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- A related non-lambda testcase: ``` struct b{int a;}; template<b>struct F1{}; F1<b{(1>0)}> a; F1<b{1>0}> a0; ``` ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/111008] '>' in a lambda as a template argument causes a syntax error 2023-08-13 22:10 [Bug c++/111008] New: '>' in a lambda as a template argument causes a syntax error shin1_morita at yahoo dot co.jp ` (2 preceding siblings ...) 2023-08-13 22:22 ` pinskia at gcc dot gnu.org @ 2023-08-13 22:44 ` pinskia at gcc dot gnu.org 2023-08-13 22:46 ` pinskia at gcc dot gnu.org 2023-08-14 18:13 ` pinskia at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-08-13 22:44 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111008 --- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Here is a C++11 testcase that also fails in a similar way: ``` typedef int b; template<b>struct F1{}; F1<b{(1>0)}> a; F1<b{1>0}> a0; ``` ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/111008] '>' in a lambda as a template argument causes a syntax error 2023-08-13 22:10 [Bug c++/111008] New: '>' in a lambda as a template argument causes a syntax error shin1_morita at yahoo dot co.jp ` (3 preceding siblings ...) 2023-08-13 22:44 ` pinskia at gcc dot gnu.org @ 2023-08-13 22:46 ` pinskia at gcc dot gnu.org 2023-08-14 18:13 ` pinskia at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-08-13 22:46 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111008 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- See Also| |https://gcc.gnu.org/bugzill | |a/show_bug.cgi?id=33744 --- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- I suspect the fix will look similar to the fix of PR 33744 . ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/111008] '>' in a lambda as a template argument causes a syntax error 2023-08-13 22:10 [Bug c++/111008] New: '>' in a lambda as a template argument causes a syntax error shin1_morita at yahoo dot co.jp ` (4 preceding siblings ...) 2023-08-13 22:46 ` pinskia at gcc dot gnu.org @ 2023-08-14 18:13 ` pinskia at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-08-14 18:13 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111008 --- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Here is another valid C++20 which is also causing issues, this time with `>>` rather than `>`: ``` typedef int b; template<b>struct F1{}; template<auto>struct F2{}; F1<b{(1>0)}> a; constexpr int t = 3; F2<F1<b{t>>0}>{}> a0; ``` ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2023-08-14 18:13 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-08-13 22:10 [Bug c++/111008] New: '>' in a lambda as a template argument causes a syntax error shin1_morita at yahoo dot co.jp 2023-08-13 22:12 ` [Bug c++/111008] " pinskia at gcc dot gnu.org 2023-08-13 22:17 ` pinskia at gcc dot gnu.org 2023-08-13 22:22 ` pinskia at gcc dot gnu.org 2023-08-13 22:44 ` pinskia at gcc dot gnu.org 2023-08-13 22:46 ` pinskia at gcc dot gnu.org 2023-08-14 18:13 ` pinskia at gcc dot gnu.org
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