https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101628
Bug ID: 101628
Summary: Preprocessor errors on extended characters in #if 0
code block
Product: gcc
Version: 10.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: david.post at ohyonghao dot com
Target Milestone: ---
In a #if 0 code block, the presence of characters outside the extended
character set being used as an identifier still gets passed to the C++ compiler
and errors out with the message:
error: extended character ∂ is not valid in an identifier
Sample code:
int main(int argc, char **argv){
#if 0
Q_∂(false)
#endif
return 0;
}
The code within the #if 0 block should never be compiled which is the behavior
of other compilers such as clang++ which gleefully ignores bad code within #if
0 block.
To clarify, with clang++ the code errors without the #if 0 block, which is
expected behavior, and compiles with the #if 0 block around the bad code. g++
errors in both cases.
