[Bug middle-end/55185] New: Error generated on extern inline function which isn't called

[Bug middle-end/55185] New: Error generated on extern inline function which isn't called

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55185

             Bug #: 55185
           Summary: Error generated on extern inline function which isn't
                    called
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hjl.tools@gmail.com


On x86-64:

[hjl@gnu-tools-1 tmp]$ cat y.i
extern double strtod (const char *__restrict __nptr,
        char **__restrict __endptr);

extern __inline double
atof (const char *__nptr)
{
  return strtod (__nptr, (char **) ((void *)0));
}
[hjl@gnu-tools-1 tmp]$ gcc -S -O y.i
[hjl@gnu-tools-1 tmp]$ cat y.s
    .file    "y.i"
    .ident    "GCC: (GNU) 4.7.2 20120921 (Red Hat 4.7.2-2)"
    .section    .note.GNU-stack,"",@progbits
[hjl@gnu-tools-1 tmp]$ gcc -S -O y.i -mno-sse
y.i: In function ‘atof’:
y.i:6:1: error: SSE register return with SSE disabled
[hjl@gnu-tools-1 tmp]$

[Bug middle-end/55185] Error generated on extern inline function which isn't called

[dabler at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55185

--- Comment #1 from DaBler <dabler at gmail dot com> 2012-12-04 20:55:17 UTC ---
I have same problem here:

$  gcc -O3 -mno-sse -xc - <<END
> #include <stdlib.h>
> int main(){return 0;}
> END
In file included from <stdin>:1:0:
/usr/include/stdlib.h: In function ‘atof’:
/usr/include/stdlib.h:280:1: error: SSE register return with SSE disabled

[Bug middle-end/55185] Error generated on extern inline function which isn't called

[markus at trippelsdorf dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55185

Markus Trippelsdorf <markus at trippelsdorf dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |markus at trippelsdorf dot de

--- Comment #2 from Markus Trippelsdorf <markus at trippelsdorf dot de> ---
Ping.

I came across this issue while debugging a python problem.
Trying to compile python with "-mno-sse -mno-sse2 -mno-sse3 -mno-sse4a"
I get during configuration:
...
/usr/include/bits/stdlib-float.h: In function 'atof':
/usr/include/bits/stdlib-float.h:27:1: error: SSE register return with SSE
disabled

[Bug middle-end/55185] Error generated on extern inline function which isn't called

[markus at trippelsdorf dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55185

--- Comment #3 from Markus Trippelsdorf <markus at trippelsdorf dot de> ---
markus@x4 ~ % cat test.i
extern double foo();
void bar() { foo(); }
markus@x4 ~ % gcc -m32 -O2 -mno-sse -c test.i
markus@x4 ~ % gcc -O2 -mno-sse -c test.i
test.i: In function ‘bar’:
test.i:2:17: error: SSE register return with SSE disabled
 void bar() { foo(); }
                 ^
markus@x4 ~ % clang -O2 -mno-sse -c test.i
markus@x4 ~ %
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Subject: [Bug c++/57038] Latest libreoffice compilation fails with enabled LTO
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idW038

--- Comment #15 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Hmm, this still does not seem helpful.
mkdir -p
/home/marxin/Programming/libreoffice/workdir/unxlngx6.pro/Dep/CxxObject/comphelper/source/property/
&& echo
"/home/marxin/Programming/libreoffice/workdir/unxlngx6.pro/CxxObject/comphelper/source/property/propagg.o
: /home/marxin/Programming/libreoffice/workdir/unxlngx6.pro/Misc/PHONY" >
/home/marxin/Programming/libreoffice/workdir/unxlngx6.pro/Dep/CxxObject/comphelper/source/property/propagg.d

is the only occurence of propagg, so apparently it was not rebuilt.  When
producing the preprocessed files, it is necessary to use exactly the same
command line as used to produce the .o (since -D, -march and other options
introduce new defines and they affect preprocessor) and then let me know the
optimization flags...

I will try to reproduce it on mozilla but that one seems to build just fine for
me. Will updat to current tree.