On 2014.03.04 at 13:00 +0100, Richard Biener wrote: > > The following patch addresses the common (?) issue of people > omitting -flto from the linker command-line which gets more > severe with GCC 4.9 where slim LTO objects are emitted by > default. The patch simply _always_ arranges for the linker > plugin to be used, so if there are any (slim) LTO objects > on the link LTO will be done on them. Similarly the > non-linker-plugin path in collect2 is adjusted. > > You can still disable this by specifying -fno-lto on the > linker command-line. > > One side-effect of enabling the linker-plugin by default > (for HAVE_LTO_PLUGIN == 2) is that collect2 will then > use the configured plugin ld rather than the default ld. > Not sure if that is desired. > > Comments?
I've been using a similar patch (without the collect2.c hunks) locally for the past few month without any problems. What is missing is a big fat warning in http://gcc.gnu.org/gcc-4.9/changes.html that one should use the gcc binutils wrappers (gcc-ar, etc.) when building projects with LTO. -- Markus
