https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71637
Bug ID: 71637
Summary: -Wmisleading-indentation only triggered when using
integrated cpp
Product: gcc
Version: 6.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: megahallon at gmail dot com
Target Milestone: ---
The following program:
---
#define m(x) ({ int y; if (x) y=0; else y=1; y; })
int main()
{
int x =
m(0);
return x;
}
---
compiled with:
gcc -ftrack-macro-expansion=0 -Wmisleading-indentation test.c
Gives a warning:
test.c:6:5: warning: this ‘else’ clause does not guard...
[-Wmisleading-indentation]
m(0);
^
Which is possibly as expected given no macro expansion tracking, however when
trying to check the output with -save-temps (or using -no-integrated-cpp) the
warning is not issued making it difficult to understand what is going on.
This is extra confusing when using ccache (or similar system working on
preprocessed files) and -Werror as a ccache build will work, while not using
ccache will fail. By the way, ccache is also the reason to use
-ftrack-macro-expansion=0, see bug 60014.
gcc version 6.1.1 20160620 (Debian 6.1.1-7)
