[ccache] Support for -fprofile-generate, -fprofile-use, -fprofile-arcs

[Chris AtLee]

On Mon, Aug 15, 2011 at 7:49 AM, Jonathan Martens <jonathan at snetram.nl> wrote:
> This commit brakes compilation on windows with the following errror:
>
>    gcc -g -O2 -Wall -W  -o ccache.exe main.o ccache.o mdfour.o hash.o
> execute.o util.o args.o stats.o version.o cleanup.o snprintf.o unify.o
> manifest.o hashtable.o hashtable_itr.o murmurhashneutral2.o hashutil.o
> getopt_long.o exitfn.o lockfile.o counters.o language.o compopt.o -Lzlib
>  -lzccache.o: In function `cc_process_args':
>    D:\MinGW\msys\1.0\home\bb.mythtv\ccache-jrosdahl/ccache.c:1610: undefined
> reference to `x_realpath'
>    collect2: ld returned 1 exit status
>    make: *** [ccache.exe] Error 1
>
> This seems to be because x_realpath is defined inside a #ifndef _WIN32 block
> in util.c however it is referenced without such a clause in ccache.c like
> this:
>
> ```c
> /* Convert to absolute path. */
> arg_profile_dir = x_realpath(arg_profile_dir + 1);
> ```
>
> I am not sure if the code needs to be in an ifndef construct, as I have not
> looked at it too much.

Assuming -fprofile-generate/-fprofile-use also work on windows, that
code shouldn't be ifdef'ed out. Instead I need an equivalent to
x_realpath for windows (or windows support for x_realpath).

Cheers,
Chris