Bug: -pg not working

### Contact Details brad@bradhutchings.com ### What happened? `-pg` is supposed to instruct gcc compiler and linker to generate a `gmon.out` file containing execution timings that can be processed by `gprof` to profile your app. I have not gotten it to work with `cosmocc` (and platform specific tools) while building [llamafile](https://github.com/Mozilla-Ocho/llamafile) or [Mmojo Server](https://github.com/BradHutchings/Mmojo-Server). After digging into Cosmo source to see if I could figure out what was going on, I made a simple example based on the instructions in the main [README.md](https://github.com/jart/cosmopolitan/blob/master/README.md). Start by downloading the latest release: ``` mkdir -p cosmocc cd cosmocc wget https://cosmo.zip/pub/cosmocc/cosmocc.zip unzip cosmocc.zip ``` Let's make a c++ app that runs long enough to generate a good `gmon.out` file: ``` cat << EOF > hello.cpp #include <iostream> #include <thread> // For std::this_thread::sleep_for #include <chrono> // For std::chrono::seconds, milliseconds, etc. int main() { std::cout << "Starting..." << std::endl; // Sleep for 2 seconds std::this_thread::sleep_for(std::chrono::seconds(2)); std::cout << "Resuming after 2 seconds." << std::endl; // Sleep for 500 milliseconds std::this_thread::sleep_for(std::chrono::milliseconds(500)); std::cout << "Resuming after 500 milliseconds." << std::endl; return 0; } EOF ``` Let's compile it with the `-pg` flag: ``` g++ -o hello_cpp hello.cpp -pg ``` Run it: ``` ./hello_cpp ``` Verify that `gmon.out` was generated: ``` ls -al gmon.out ``` Delete everything we built: ``` rm hello_cpp* gmon.out ``` Set the $BUILDLOG variable to current directory and build with `cosmocc`: ``` BUILDLOG=$(pwd)/build.log bin/cosmocc -o hello_cpp hello.cpp -Iinclude/third_party/libcxx -pg ``` Verify that `-pg` was passed to build commands: ``` grep "\-pg" build.log ``` Run it: ``` ./hello_cpp ``` Verify that `gmon.out` **was not** generated: ``` ls -al gmon.out ``` ### Version cosmocc (GCC) 14.1.0 ### What operating system are you seeing the problem on? Linux ### Relevant log output ```shell `build.log` shows `cosmocc` passing `-pg` along. mmojo@mmojo:~/cosmocc $ grep "\-pg" build.log # bin/cosmocc -o hello_cpp hello.cpp -Iinclude/third_party/libcxx -pg (cd /home/mmojo/cosmocc; bin/x86_64-linux-cosmo-gcc -o/tmp/fatcosmocc.5dz0b8pewwvi3.o -D__COSMOPOLITAN__ -D__COSMOCC__ -D__FATCOSMOCC__ -include libc/integral/normalize.inc -fportcosmo -fno-semantic-interposition -fno-optimize-sibling-calls -mno-omit-leaf-frame-pointer -fno-schedule-insns2 -Wno-implicit-int -mno-tls-direct-seg-refs -fpatchable-function-entry=18,16 -fno-inline-functions-called-once -DFTRACE -DSYSDEBUG -fno-pie -nostdinc -isystem bin/../include -Iinclude/third_party/libcxx -pg -c hello.cpp -fno-omit-frame-pointer) (cd /home/mmojo/cosmocc; bin/aarch64-linux-cosmo-gcc -o/tmp/fatcosmocc.7cgk59iyxay31.o -D__COSMOPOLITAN__ -D__COSMOCC__ -D__FATCOSMOCC__ -include libc/integral/normalize.inc -fportcosmo -fno-semantic-interposition -fno-optimize-sibling-calls -mno-omit-leaf-frame-pointer -fno-schedule-insns2 -Wno-implicit-int -ffixed-x18 -ffixed-x28 -fpatchable-function-entry=7,6 -fno-inline-functions-called-once -DFTRACE -DSYSDEBUG -fno-pie -nostdinc -isystem bin/../include -fsigned-char -Iinclude/third_party/libcxx -pg -c hello.cpp -fno-omit-frame-pointer) (cd /home/mmojo/cosmocc; bin/x86_64-linux-cosmo-gcc -o/tmp/fatcosmocc.qj1z2n0q94fj0.com.dbg bin/../x86_64-linux-cosmo/lib/ape.o bin/../x86_64-linux-cosmo/lib/crt.o -static -nostdlib -no-pie -fuse-ld=bfd -Wl,-z,noexecstack -Wl,-z,norelro -Wl,--gc-sections -Lbin/../x86_64-linux-cosmo/lib -Lbin/../x86_64-linux-cosmo/lib -Wl,-T,bin/../x86_64-linux-cosmo/lib/ape.lds -Wl,-z,common-page-size=4096 -Wl,-z,max-page-size=16384 /tmp/fatcosmocc.5dz0b8pewwvi3.o -Iinclude/third_party/libcxx -pg -lcosmo) (cd /home/mmojo/cosmocc; bin/aarch64-linux-cosmo-gcc -o/tmp/fatcosmocc.hdxwmenicjw91.aarch64.elf bin/../aarch64-linux-cosmo/lib/crt.o -static -nostdlib -no-pie -fuse-ld=bfd -Wl,-z,noexecstack -Wl,-z,norelro -Wl,--gc-sections -Lbin/../aarch64-linux-cosmo/lib -Lbin/../aarch64-linux-cosmo/lib -Wl,-T,bin/../aarch64-linux-cosmo/lib/aarch64.lds -Wl,-z,common-page-size=16384 -Wl,-z,max-page-size=16384 /tmp/fatcosmocc.7cgk59iyxay31.o -Iinclude/third_party/libcxx -pg -lcosmo) ```