1.4.5 build fails on fedora with "dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]"

[ingvarha]

1.4.5 build fails on fedora with

"dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]"

Environment: Fedora 25 on x86_64, gcc (GCC) 6.3.1 20161221 (Red Hat 6.3.1-1)

Build log at https://paste.fedoraproject.org/paste/8zWK0hi8sMwc8xB1zbyzW15M1UNdIGYhyRLivL9gydE=

[ingvarha]

or here
build.log.txt

[daghf]

Thanks for spotting this. Could you try adding -Wno-error=strict-aliasing to your CFLAGS as a workaround until we fix the code?

[ingvarha]

adding -Wno-error=strict-aliasing hides the problem

[daghf]

This was due to the libev library's use of casts in its header file that don't quite comply with gcc's understanding of strict aliasing.

I've reverted a previous change and it's back to using -fno-strict-aliasing in place of -Wno-strict-aliasing now, which fixes the build for epel6/7.