hai shi <shihai1...@126.com> added the comment:

After `CFLAGS` replcaced by `CFLAGS_NODIST`, some extension module built 
failed, some info like:
*** WARNING: renaming "_struct" since importing it failed: 
build/lib.linux-x86_64-3.9/_struct.cpython-39-x86_64-linux-gnu.so: undefined 
symbol: __gcov_merge_add

the possible reason:
building '_struct' extension
gcc -pthread -fPIC -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 
-Wall -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter 
-Wno-missing-field-initializers -Werror=implicit-function-declaration 
-fvisibility=hidden -O0 -pg --coverage -I./Include/internal -I./Include -I. 
-I/usr/local/include -I/temp/shihai/cpython/Include -I/temp/shihai/cpython -c 
/temp/shihai/cpython/Modules/_struct.c -o 
build/temp.linux-x86_64-3.9/temp/shihai/cpython/Modules/_struct.o
gcc -pthread -shared (xxxxxxxxxxlacking --coverage in here xxxxxxxxx) 
build/temp.linux-x86_64-3.9/temp/shihai/cpython/Modules/_struct.o 
-L/usr/local/lib -o 
build/lib.linux-x86_64-3.9/_struct.cpython-39-x86_64-linux-gnu.so

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40237>
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