GCC Bugzilla Bug 19232

When running the testsuite with mainline on i686-pc-linux-gnu with -fpic or -
fPIC, I get the following additional failures:

FAIL: gcc.dg/assign-warn-3.c  (test for warnings, line 9)
FAIL: gcc.dg/assign-warn-3.c  (test for warnings, line 13)

The expected warnings simply fail to appear with the extra flag.  Warning 
output should not be affected by this.

I cannot reproduce this with a cross from a couple of days ago.

With today's mainline I get the following results which confirm
Kaveh's observations:

gcc -c -O assign-warn-3.c:         no warning       
gcc -c -O2 assign-warn-3.c:        no warning
gcc -c -O3 assign-warn-3.c:        warning
gcc -c -O assign-warn-3.c -fpic:   no warning
gcc -c -O2 assign-warn-3.c -fpic:  no warning
gcc -c -O3 assign-warn-3.c -fpic:  no warning !!!

That no warning is emitted with -O and -O2 is expected since no
inlining takes place.

Just for curiosity I marked f0 and f1 in the test as inline and
got the following results:

gcc -c -O assign-warn-3.c:         no warning !!!
gcc -c -O2 assign-warn-3.c:        warning
gcc -c -O3 assign-warn-3.c:        warning
gcc -c -O assign-warn-3.c -fpic:   warning
gcc -c -O2 assign-warn-3.c -fpic:  warning
gcc -c -O3 assign-warn-3.c -fpic:  warning

Here I'd expect a warning in all six cases.

(In reply to comment #2)
> With today's mainline I get the following results which confirm
> Kaveh's observations:
> 
> gcc -c -O assign-warn-3.c:         no warning       
> gcc -c -O2 assign-warn-3.c:        no warning
> gcc -c -O3 assign-warn-3.c:        warning
> gcc -c -O assign-warn-3.c -fpic:   no warning
> gcc -c -O2 assign-warn-3.c -fpic:  no warning
> gcc -c -O3 assign-warn-3.c -fpic:  no warning !!!

To repsond to this one, with -fpic/PIC we don't inline functions which can be overridden by other TUs.

(In reply to comment #3)
> To repsond to this one, with -fpic/PIC we don't inline functions which can be overridden by other TUs.

More to the point, this testcase is only testing when inlining which means with
-fPIC it does not inline at all.

Nathan Froyd checked in a patch for this.