On 15/6/22 7:56 pm, Richard Biener wrote: > On Wed, Jun 15, 2022 at 11:27 AM Chris Johns <ch...@contemporary.net.au> > wrote: >> >> Hi, >> >> I am trying to build a cross-compiler on FreeBSD with --enable-lto because a >> chip vendor is using it when building controller software that is part of a >> system. >> >> The build I am using symlinks gmp, mpfr etc as source so they are built as >> part >> of the gcc build. >> >> The mpfr package is reporting ... >> >> build/mpfr/config.log:configure:17408: error: Link Time Optimisation is not >> supported (see config.log for details). >> >> Should the enable option be passed to these packages? > > You shouldn't need --enable-lto, it's effect (adding lto to the set of > compiled > languages) is already the default. You can use --enable-languages=default,lto > to achieve the same effect without getting the mpfr side-effect.
Oh that is great and I had no idea this is how it is controlled. I have rebuilt my compiler and it is now building. Nice. >> I have assumed the enable option for LTO is for the cross compiler and not >> the >> host gcc? > > it's for the built GCC, enabling LTO support (but not for enabling > building GCC itself > with LTO). It now makes sense. I will also update the RTEMS tools builds. Thanks Chris
