I've noticed that if you run gprof with -z (unused functions) you'll see
it provides all the expected functions but with 0 measures for
everything (even _mcount_private).
- David
On 4/29/2021 7:46 PM, [email protected] wrote:
Yeah, that matches up with what I've experienced using Mingw64-Builds
8.1.0 release as well.
I need the newer C++ features of 10.2 for the project I was originally
trying to profile though.
I've raised an issue 8503 on the MSYS2 github for this.
https://github.com/msys2/MINGW-packages/issues/8503
Though I don't know if that's the best place to raise it?
- David
-------- Original message --------
From: DAVID MAY <[email protected]>
Date: Thu, 29 Apr 2021, 19:16
To: [email protected], David Murphy
<[email protected]>
Subject: Re: [Mingw-w64-public] Compiling with -pg and executable's
gmon.out has empty gprof results
Some more information on this issue:
I looked at one of my old C++ projects developed using MSYS2 last year
and reran the current gprof program using the old project profiled
executable and its gmon.out file created on 10 November 2020. A
correct
report was generated.
On 28/04/2021 10:41 am, David Murphy wrote:
> There's lots of detail in my question here
>
https://stackoverflow.com/questions/67240792/gprof-producing-no-output-for-a-program-that-takes-reasonable-time-to-execute
>
>
> To summarise:
>
> 1. I'm using Mingw64 latest packages from MSYS2
> 2. Program is compiled and linked with -g -pg
> 3. Program, when executed, produces gmon.out
> 4. Parsing gmon.out through gprof gives empty results
>
> I've checked:
>
> 1. Program exits normally
> 2. I've tested two different programs (code below) in an attempt to
> ensure there's enough time spent in the functions to generate
results.
> Both programs take a long time to execute.
> 3. I've compiled with and without -no-pie
> 4. I've tried both 32bit and 64bit releases
> 5. Tried both GCC and G++
>
> In the stack overflow question I've also provided additional
info from
> VTune (that I don't fully understand).
>
> Everyone else who's compiled and tested the programs gives them a
> gmon.out and gprof gives them output. I'm not sure what else I
can do to
> figure out why I'm unable to profile code. I've asked MSYS2 devs but
> they've not responded. Considering MSYS2 is pretty much just
packaging
> Mingw64 I was hoping someone in this mailing list might be able
to help,
> or at least point me in the right direction.
>
>
> Program for Primes:
>
> #include <iostream>
>
> bool is_prime(const int& number)
> {
> if(number == 0 || number == 1)
> return false;
> else
> {
> for(int i = 2; i <= number / 2; ++i)
> {
> if(number % i == 0)
> {
> return false;
> }
> }
> }
>
> return true;
> }
>
> int main()
> {
> int low = 0;
> int high = 1000000;
>
> while(low < high)
> {
> if(is_prime(low))
> std::cout << low << ", ";
>
> ++low;
> }
>
> std::cout << std::endl;
>
> return 0;
> }
>
>
> Program for long function calls:
>
> //test_gprof.c
> #include<stdio.h>
>
> void new_func1(void)
> {
> printf("\n Inside new_func1()\n");
> int i = 0;
>
> for(;i<0xffffffff;i++);
>
> return;
> }
>
> void func1(void)
> {
> printf("\n Inside func1 \n");
> int i = 0;
>
> for(;i<0xffffffff;i++);
> new_func1();
>
> return;
> }
>
> static void func2(void)
> {
> printf("\n Inside func2 \n");
> int i = 0;
>
> for(;i<0xffffffff;i++);
> return;
> }
>
> int main(void)
> {
> printf("\n Inside main()\n");
> int i = 0;
>
> for(;i<0xffffff;i++);
> func1();
> func2();
> func1();
> func2();
>
> return 0;
> }
>
> Any help would be greatly appreciated.
>
> Cheers,
> David
>
>
>
> _______________________________________________
> Mingw-w64-public mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
--
David May
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