Uhm, may I ask for some pointers to Altera/Stawberry cygwins -- what is it?
On Tue, Jun 18, 2013 at 4:06 PM, J.B.W.Webber <j.b.w.web...@kent.ac.uk> wrote:
>
>
> -----Original Message-----
> Subject: Re: What is a good profiling tool ? - problem with gprof
>
> On Jun 18 12:11, Corinna Vinschen wrote:
>> On Jun 17 12:52, Larry Hall (Cygwin) wrote:
>> > On 6/17/2013 12:19 PM, J.B.W.Webber wrote:
>> > >Hi, I am trying to find in which function call the most time is being
>> > >spent.
>> > >
>> > >I am using gcc and trying to compile and link with -g and -pg.
>> > >i.e. for a trivial test :
>> > >
>> > >$ cat helloworld.c
>> > >/* Hello World program */
>> > >#include<stdio.h>
>> > >main()
>> > >{
>> > > printf("Hello World\n");
>> > >}
>> > >
>> > >$ gcc -g -pg -c helloworld.c
>> > >$ gcc -pg helloworld.o
>> > >helloworld.o: In function `main':
>> > >helloworld.c:6: undefined reference to `_mcount'
>> > >collect2: ld returned 1 exit status
>> > >
>> > >Any ideas ? Am I missing a .h call ? Or do I need to link to something ?
>> >
>> > Worked for me. Perhaps your Strawberry gcc installation is interfering.
>>
>> I don't know how you succeeed to build that, Larry. I could easily
>> reproduce the problem. It was a build problem in Cygwin. I fixed
>> that now and at the same time made the 64 bit profiling workable,
>> curtesy the
>> Mingw-w64 project, which already did the required work. The original
>> profiling code was created within the Cygwin project ages ago, so I
>> could included the latest Mingw-w64 profiling code (almost) verbatim
>> into Cygwin and now it seems to work fine again for 32 and 64 bit.
>>
>> I'm just about to create a 2013-06-18 32 bit snapshot on
>> http://cygwin.com/snapshots/ and a 64 bit test release 1.7.12-5, which
>> both should be ready in an hour.
>
> Uploaded. Please note that it's *not* enough to install the snapshot Cygwin
> DLL. The important items here are gcrt0.o and libgmon.a.
>
>
> Corinna
>
> --
> Corinna Vinschen Please, send mails regarding Cygwin to
> Cygwin Maintainer cygwin AT cygwin DOT com
> Red Hat
>
> _____________________________________________
>
> Really thanks to all. That now works.
>
> Sorry for the slow reply, I did the install with the snapshot as suggested
> - no difference, at first, but I had been given the clues I needed.
>
> I used find to track all libgmon.a on my laptop :
>
> C:/Altera/12.0sp2/quartus/bin/cygwin/lib/libgmon.a
> C:/Altera/12.0sp2/quartus/bin/cygwin/lib/mingw/libgmon.a
> C:/Altera/12.0sp2/quartus/bin/cygwin/usr/i686-pc-mingw32/lib/libgmon.a
> C:/Applications/Strawberry/c/x86_64-w64-mingw32/lib/libgmon.a
> C:/cygwin/lib/libgmon.a
> C:/cygwin/usr/i686-pc-mingw32/sys-root/mingw/lib/libgmon.a
> C:/cygwin/usr/lib/libgmon.a
>
> I blocked access to the Altera and Strawberry Cygwins, which made no
> difference, (no, XMOS does not use Cygwin)
> But the answer was the version C:/cygwin/lib/libgmon.a
> I copied the new gcrt0.o and libgmon.a into C:/cygwin/lib/
> and all now works fine. I have the answer I needed.
>
> I do thank you all,
> Cheers,
> Beau
>
>
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