https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81717
Bug ID: 81717
Summary: [c++ concepts] - simple "define function if not
defined" code doesn't compile, no errors generated
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jordok at wp dot pl
Target Milestone: ---
Created attachment 41925
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41925&action=edit
Minimal code to reproduce
Simple usage of keyword `requires` (C++ concepts) to define a function only if
it's not already defined causes compilation failure.
Code attached is a minimal example of situation in which compilation fails, but
no error is generated.
g++ --version: g++.exe (MinGW.org GCC-6.3.0-1) 6.3.0
OS : Windows 7 (x64)
Compiling with command: g++ -Wall -fconcepts source.cpp
Which generates no text output and no files. Are generated.
Checked also here: http://coliru.stacked-crooked.com/a/16466d6c732d9f21
Same source code compiled with:
g++ -std=c++17 -fconcepts -Wall -Wextra main.cpp && ./a.out
main.cpp: In function 'bool foo(A)':
main.cpp:6:12: warning: unused parameter 'a' [-Wunused-parameter]
bool foo(A a) {
^
g++: internal compiler error: Segmentation fault (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
In this IDE (Coliru), g++ --version gives:
g++ (GCC) 7.1.0
