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Always pass -fno-strict-aliasing during compilation (#714)
The ksh93 codebase is incompatible with strict aliasing, yet currently the default flags enable -fstrict-aliasing via the -Os optimization flag. Additionally, manually passing a higher level optimization flag via CCFLAGS (e.g. -O3) will result in strict aliasing becoming inadvertently enabled unless -fno-strict-aliasing is explicitly passed to disable it (cf. the Fedora and OpenSUSE build scripts for ksh[*]). This commit implements a probe that will detect the existence of -fno-strict-aliasing and use it via ${mam_cc_FLAGS}, bypassing CCFLAGS. [*]: https://src.fedoraproject.org/rpms/ksh/blob/rawhide/f/ksh.spec#_49 https://build.opensuse.org/package/view_file/shells/ksh/ksh.spec?expand=1
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