[Interest] Qt 5 LTO build on OS X 10.9 (and earlier)
René J. V. Bertin
rjvbertin at gmail.com
Fri Sep 11 21:48:32 CEST 2015
Thiago Macieira wrote:
> No, just like Qt won't pick up gcc-4.8, clang-3.5 or gcc-ar-4.9. You must
> provide a PATH entry that contains the binaries without suffix or you'll have
> to tinker with the mkspec (QMAKE_AR).
QMAKE_AR_LTCG in fact (and QMAKE_NM_LTCG, QMAKE_RANLIB_LTCG). On OS X that also
means tinkering with mac/sdk.prf to ensure that xcrun isn't used to undo any
compiler selection you'd make in one of "the usual ways".
About using alternate compilers: I haven't yet figured out how to get qmake to
build using the compiler of choice, as well as the config tests. For qmake the
compiler choice probably doesn't make a lot of difference, but the config tests
probably best be done with the compiler that's used to do the actual build,
don't you think?
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