-pedantic -Werror in cmakelist causes error when compiling on ubuntu18.04 #102
Description
I am building on Ubuntu 18.04.4 LTS with gcc Version 10.3.0. The following warning
2021-07-09@12:00:17:DEBUG:O2-full-system-test:DataDistribution:0: /software/flo/alice/sw/SOURCES/DataDistribution/heads-v1.0.0/0/src/common/base/DataDistLogger.h:377:11: warning: ignoring return value of 'int nice(int)' declared with attribute 'warn_unused_result' [-Wunused-result]
2021-07-09@12:00:17:DEBUG:O2-full-system-test:DataDistribution:0: 377 | nice(+10);
2021-07-09@12:00:17:DEBUG:O2-full-system-test:DataDistribution:0: | ~~~~^~~~~causes a crash on my system and I can only build succesfully when removing
if(NOT APPLE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic -Werror")
endif()from the cmakelist. Since I do not fully understand what was the original purpose using these specific compiler flags for none apple systems, I just open this issue and leave it up to the maintainers.
In addition the build failed on my system due to:
Undefined reference to 'dlsym'which I could fix by adding
-Wl,--no-as-needed -ldlto the cxx flags. However this might be an unrelated issue with my system, just wanted to leave this info here for future reference
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