[Bug gcov-profile/55734] [4.8 Regression] gcov-io.c uses builtins not available in non-GCC compilers

[tejohnson at google dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55734

--- Comment #9 from Teresa Johnson <tejohnson at google dot com> 2012-12-18 16:31:08 UTC ---
On Tue, Dec 18, 2012 at 8:25 AM, aldyh at gcc dot gnu.org
<gcc-bugzilla@gcc.gnu.org> wrote:
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55734
>
> Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
>
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>   Attachment #28999|0                           |1
>         is obsolete|                            |
>
> --- Comment #8 from Aldy Hernandez <aldyh at gcc dot gnu.org> 2012-12-18 16:25:49 UTC ---
> Created attachment 29000
>   --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29000
> proposed patch
>
> Duh, they're always available.  Like this?

Things will build, but you will presumably get an undefined symbol in
your libgcov.a, which would result in an undefined trying to build
with -fprofile-generate. Can you verify that this works. I just
checked with a similar change, which yields:

$ nm gcc/libgcov.a | grep popc
                 U popcount_hwi

/home/tejohnson/extra/gcc_trunk_5_validate/bld-gcc/gcc/libgcov.a(_gcov.o):
In function `__gcov_read_summary':
libgcov.c:(.text+0x7f3): undefined reference to `popcount_hwi'
collect2: error: ld returned 1 exit status

Teresa

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--
Teresa Johnson | Software Engineer | tejohnson@google.com | 408-460-2413