On Sun, 1 Apr 2018, Pali Rohár wrote: > Command line option -Werror is dangerous as it could cause problems for > compiling applications in future. Once gcc introduces a new warning or > change logic for existing warnings then compilation of existing > application via gcc could throw a new warning. > > As -Werror makes all warnings fatal, it makes applications not > compilable. -Werror makes sense only for specific gcc versions against > which was application tested to compile correctly.
I've been hit by that, when people thought they were clever and then caused breakage down the line with new versions of GCC. + if (value) + warning_at (loc, 0, "command line option %qs is dangerous; " + "in future newly introduced non-fatal warnings " + "can cause fatal errors", "-Werror"); "command-line" > Attached patch adds a new warning when -Werror command line option is > enabled. It warns user that usage of -Werror can be dangerous. I'm not sure this is going to make a material difference, though I agree that -Werror is one that should be used less (at least when providing source code to others). Gerald
