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** [issues:#5618] configure: Fix tests for compiler warning flags.**
**Status:** Started
**Created:** Sat Nov 23, 2019 09:03 PM UTC by Werner LEMBERG
**Last Updated:** Sat Nov 23, 2019 09:03 PM UTC
**Owner:** nobody
`AC_LANG_PROGRAM` ignores compiler warnings. This behaviour made the tests
always true and thus without any effect. We now add `-Werror` to enforce an
error in case the warning flag is not known.
To make that work it is also necessary to compile `confdefs.h` without
warnings; we add a hack to undefine macro `PACKAGE_NAME`, which gets defined
twice for historical reasons.
https://codereview.appspot.com/551210043
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