[Bug gcov-profile/113157] New: compilation error in PGO

[Bug gcov-profile/113157] New: compilation error in PGO

[jiahaoxiang.hust at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113157

            Bug ID: 113157
           Summary: compilation error in PGO
           Product: gcc
           Version: 11.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jiahaoxiang.hust at gmail dot com
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

I tried to compile these programs with PGO compilation, but the compilation
unexpectedly resulted in an error.

# gcov -v
gcov (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/11/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
11.4.0-1ubuntu1~22.04' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-11
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib
--enable-libphobos-checking=release --with-target-system-zlib=auto
--enable-objc-gc=auto --enable-multiarch --disable-werror --enable-cet
--with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none=/build/gcc-11-XeT9lY/gcc-11-11.4.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-11-XeT9lY/gcc-11-11.4.0/debian/tmp-gcn/usr
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
--with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04)

# cat 1.c
extern int e;
int a;
int b;
void test(int c, _Bool d) {
  if (c)
    e = d ? b : a;
}

# cat 2.c
int e;
void test(int c, _Bool d);
void main() { test(1,1); }

# gcc --coverage -o test 1.c 2.c
# ./test
# gcc -O3 -fprofile-use -o test 1.c 2.c
1.c: In function 'test':
1.c:7:1: error: corrupted profile info: profile data is not flow-consistent
    7 | }
      | ^
1.c:7:1: error: corrupted profile info: number of executions for edge 2-3
thought to be 2
1.c:7:1: error: corrupted profile info: number of executions for edge 2-7
thought to be -1

[Bug gcov-profile/113157] compilation error in PGO

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113157

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>1.c:7:1: error: corrupted profile info: profile data is not flow-consistent


This is because you different options while compiling the 2 versions of the
applications.  Yes the diagnostic should be better though.

[Bug gcov-profile/113157] compilation error in PGO

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113157

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
That is this works:
[apinski@xeond2 pr113157]$ gcc --coverage -o test 1.c 2.c -O3
[apinski@xeond2 pr113157]$ ./test
[apinski@xeond2 pr113157]$ gcc -O3 -fprofile-use -o test 1.c 2.c