[Bug preprocessor/69391] New: Incorrect __LINE__ expansion with -ftrack-macro-expansion=0
mail at bobah dot net
gcc-bugzilla@gcc.gnu.org
Wed Jan 20 16:24:00 GMT 2016
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69391
Bug ID: 69391
Summary: Incorrect __LINE__ expansion with
-ftrack-macro-expansion=0
Product: gcc
Version: 5.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: mail at bobah dot net
Target Milestone: ---
The below test program
- incorrectly prints "83" on g++ 5.2 with '-ftrack-macro-expansion=0'
- correctly prints "88" on g++ 5.2 with '-ftrack-macro-expansion=1'
- correctly prints "88" on g++ 4.9 regardless of '-ftrack-macro-expansion' flag
#define STR_I(X) #X
#define STR(X) STR_I(X)
#define LINE STR(__LINE__) STR(__LINE__)
#include <iostream>
int main()
{
std::cout << LINE << "\n";
return 0;
}
More information about the Gcc-bugs
mailing list