Hello, I am aware that lto bugs are not supported but I would like to request a (masked) use flag for link-time optimization in Libreoffice. According to the LO mailing list[1] lto support was/began_to_be added in August of 2011, and was working with lto even on gcc 4.5. Configure requires "--enable-lto" and atm this requires an environment set up for libreoffice consisting of EXTRA_ECONF="--enable-lto" as I described here[2]. [1]http://lists.freedesktop.org/archives/libreoffice/2011-August/016826.html [2]http://forums.gentoo.org/viewtopic-p-7221652.html#7221652 Reproducible: Always Steps to Reproduce: 1. CFLAGS="${CFLAGS} -flto" CXXFLAGS="${CXXFLAGS} -flto" LDFLAGS="${LDFLAGS} -flto" 2. emerge libreoffice Actual Results: checking whether to use link-time optimization... no Followed by build failing early on in the build. Expected Results: checking whether to use link-time optimization... yes checking whether to use link-time optimization... yes Is achieved when EXTRA_ECONF="--enable-lto" is in place.
with -lto and -mergedlib you get to 6gb of mem consumed during buildtime, is such behaviour ever desired? I would say it is best to be kept to the EXTRA_ECONF variable which is designed specially for this purpose. Also you don't have to export this prior build, you can create file /etc/portage/env/tlo.conf which contains the line and ldflags/cflags settings and then just add linke like this to /etc/portage/package.env app-office/libreoffice lto.conf Let me know if such solution is enough for you or not (as I would rather close this bug as wontfix until the lto matures enough to be viable option everywhere :-)).
I too noticed that large memory use, to be expected, some people may desire it if they are serious about lto and its output. I don't desire it personally. Thanks for the tip, I think I get what you mean, I use such a method for keeping the gold linker default in binutils. Anyway, I agree with WONTFIX until lto mature and that EXTRA_ECONF is sufficient for now. I was hoping for masked USE purely to be there on the back-burner and as a reminder for the future if anything :) Thanks for taking the time to test and reply.
