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From: "qinzhao at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/95348] GCC records zero functions and modules in
 the profiling data file, ICC does NOT
Date: Mon, 15 Jun 2020 19:54:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95348

--- Comment #36 from qinzhao at gcc dot gnu.org ---
I found a bug with this proposed patch:
when doing automatic merging, the following error message is emitted:
Merge mismatch for function 1.

the bug can be repeated with the small testing case I added in the comment =
#1
and the following script:

#!/bin/bash=20
GCC=3D/GCC-install-dir/bin/gcc=20
opt=3D"-O0 "=20
opt=3D"$opt -fno-inline"=20
opt_gen=3D"-fprofile-generate"=20
opt_gen=3D"$opt_gen -fprofile-dir=3Dgcc_prof_dir"=20
tf1=3D"five.c"=20
tf2=3D"ten.c"=20
libf=3D"lib.c"=20

rm -rf gcc_prof_dir=20

echo $GCC $opt $opt_gen -c $libf=20
$GCC $opt $opt_gen -c $libf -o lib.o=20

echo $GCC $opt $opt_gen $tf1=20
$GCC $opt $opt_gen -c $tf1 -o five.o=20

echo $GCC $opt $opt_gen $tf2=20
$GCC $opt $opt_gen -c $tf2 -o ten.o=20
echo $GCC $opt $opt_gen ten.o five.o lib.o -o ten=20
$GCC $opt $opt_gen ten.o five.o lib.o -o ten=20

./ten 12=20
./ten 11
echo "Done"=20

[qinzhao@localhost small_gcc]$ sh build_it_gcc
/home/qinzhao/Install/latest-821/bin/gcc -O0 -fno-inline -fprofile-generate
-fprofile-dir=3Dgcc_prof_dir -c lib.c
/home/qinzhao/Install/latest-821/bin/gcc -O0 -fno-inline -fprofile-generate
-fprofile-dir=3Dgcc_prof_dir five.c
/home/qinzhao/Install/latest-821/bin/gcc -O0 -fno-inline -fprofile-generate
-fprofile-dir=3Dgcc_prof_dir ten.c
/home/qinzhao/Install/latest-821/bin/gcc -O0 -fno-inline -fprofile-generate
-fprofile-dir=3Dgcc_prof_dir ten.o five.o lib.o -o ten
12 is greater than ten
11 is greater than ten
profiling:gcc_prof_dir/#home#qinzhao#Bugs#profile#small_gcc#lib.gcda:Merge
mismatch for function 1
profiling:gcc_prof_dir/#home#qinzhao#Bugs#profile#small_gcc#five.gcda:Merge
mismatch for function 0
Done=