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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"-pedantic -Werror in cmakelist causes error when compiling on ubuntu18.04","articleBody":"I am building on **Ubuntu 18.04.4 LTS** with **gcc Version 10.3.0**. The following warning\r\n```shell\r\n2021-07-09@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]\r\n2021-07-09@12:00:17:DEBUG:O2-full-system-test:DataDistribution:0:   377 |       nice(+10);\r\n2021-07-09@12:00:17:DEBUG:O2-full-system-test:DataDistribution:0:       |       ~~~~^~~~~\r\n```\r\ncauses a crash on my system and I can only build succesfully when removing \r\n``` bash\r\nif(NOT APPLE)\r\n  set(CMAKE_CXX_FLAGS \"${CMAKE_CXX_FLAGS} -pedantic -Werror\")\r\nendif()\r\n```\r\nfrom 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.\r\n\r\nIn addition the build failed on my system due to:\r\n```bash\r\nUndefined reference to 'dlsym'\r\n```\r\nwhich I could fix by adding \r\n```bash\r\n-Wl,--no-as-needed -ldl\r\n```\r\nto the cxx flags. However this might be an unrelated issue with my system, just wanted to leave this info here for future reference\r\n","author":{"url":"https://github.com/fjonasALICE","@type":"Person","name":"fjonasALICE"},"datePublished":"2021-07-09T10:20:27.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/102/DataDistribution/issues/102"}