Fix configure.ac : unused command line argument triggers erros #214
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As mentionned in a previous comment, unused arguments trigger errors in the configure script :
This makes detection of some features (
-fstack-clash-protectionon macOS) fail even if they are available.This is even worst in 4.x (in the yet-to-be-merged batch), as it fails to detect "gcc pointer sign", which causes many testsuite failures.
This PR simply adds
-Wno-unused-command-line-argumentto the CFLAGS under gcc and Clang (and removes if from the CI workflow). Not sure if this should come earlier in the configure file ?Should be merged in 4.x once upstream in 3.x.