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merbanan / rtl_433

Program to decode radio transmissions from devices on the ISM bands (and other frequencies)
GNU General Public License v2.0
6.14k stars 1.33k forks source link

FYI - Error building latest on ancient Raspbian Jessie -- can't find -lpthreads #1981

Closed rct closed 4 months ago

rct commented 2 years ago

Just an FYI - I have an ancient RPI 1B+ that is still running Jessie, building rtl_433 used to work, now fails due to cannot find -lpthreads when trying to build the pthreads_create test. The last time I updated, 21.05 code from 2021-08-26 built without error..

There is a /usr/lib/arm-linux-gnueabihf/libpthread.so and /usr/lib/arm-linux-gnueabihf/libpthread.a, but ld through CMake doesn't seem to find it for some reason.

I realize this is a self inflicted problem and I should rebuild^Wreplace that system. Posting this in case it helps anyone else

Determining if the function pthread_create exists in the pthreads failed with the following output:
Change Dir: /home/rct/proj/rtlsdr/merbanan/rtl_433/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTryCompileExec865147291/fast"
/usr/bin/make -f CMakeFiles/cmTryCompileExec865147291.dir/build.make CMakeFiles/cmTryCompileExec865147291.dir/build
make[1]: Entering directory '/home/rct/proj/rtlsdr/merbanan/rtl_433/build/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report /home/rct/proj/rtlsdr/merbanan/rtl_433/build/CMakeFiles/CMakeTmp/CMakeFiles 1
Building C object CMakeFiles/cmTryCompileExec865147291.dir/CheckFunctionExists.c.o
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=pthread_create   -o CMakeFiles/cmTryCompileExec865147291.dir/CheckFunctionExists.c.o   -c /usr/share/cmake-3.0/Modules/CheckFunctionExists.c
Linking C executable cmTryCompileExec865147291
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTryCompileExec865147291.dir/link.txt --verbose=1
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=pthread_create    CMakeFiles/cmTryCompileExec865147291.dir/CheckFunctionExists.c.o  -o cmTryCompileExec865147291 -rdynamic -lpthreads 
/usr/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
CMakeFiles/cmTryCompileExec865147291.dir/build.make:88: recipe for target 'cmTryCompileExec865147291' failed
zuckschwerdt commented 2 years ago

Yes, that should be -pthread, not -lpthread. I guess it comes from ${CMAKE_THREAD_LIBS_INIT}, needs some investigation why Cmake thinks pthreads needs linking as a lib?

zuckschwerdt commented 2 years ago

Oh wait, that's not actually our build failing but the Cmake threads test from find_package(Threads) which is a Cmake built-in module...

gdt commented 1 year ago

Still valid?

gdt commented 4 months ago

A bug from 2022 about raspbian that was ancient then.... Please feel free to start over if git master rtl_433 fails on any OS receiving maintainance, or file a PR to make it work on any OS regardless of upstream status.