[Bug gcov-profile/95348] GCC records zero functions and modules in the profiling data file, ICC does NOT

[qinzhao at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95348

--- 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 
GCC=/GCC-install-dir/bin/gcc 
opt="-O0 " 
opt="$opt -fno-inline" 
opt_gen="-fprofile-generate" 
opt_gen="$opt_gen -fprofile-dir=gcc_prof_dir" 
tf1="five.c" 
tf2="ten.c" 
libf="lib.c" 

rm -rf gcc_prof_dir 

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

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

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

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

[qinzhao@localhost small_gcc]$ sh build_it_gcc
/home/qinzhao/Install/latest-821/bin/gcc -O0 -fno-inline -fprofile-generate
-fprofile-dir=gcc_prof_dir -c lib.c
/home/qinzhao/Install/latest-821/bin/gcc -O0 -fno-inline -fprofile-generate
-fprofile-dir=gcc_prof_dir five.c
/home/qinzhao/Install/latest-821/bin/gcc -O0 -fno-inline -fprofile-generate
-fprofile-dir=gcc_prof_dir ten.c
/home/qinzhao/Install/latest-821/bin/gcc -O0 -fno-inline -fprofile-generate
-fprofile-dir=gcc_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