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Diffstat (limited to 'meta/conf/distro/include/lto.inc')
| -rw-r--r-- | meta/conf/distro/include/lto.inc | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/meta/conf/distro/include/lto.inc b/meta/conf/distro/include/lto.inc new file mode 100644 index 0000000000..b8193725a1 --- /dev/null +++ b/meta/conf/distro/include/lto.inc @@ -0,0 +1,51 @@ +# To enable LTO, add following in local.conf +# require conf/distro/include/lto.inc +# DISTRO_FEATURES:append = " lto" +# + +# Disable LTO for following packages +LTO:pn-glibc = "" +LTO:pn-gcc-runtime = "" +LTO:pn-libgcc-initial = "" +LTO:pn-libgcc = "" +LTO:pn-libaio = "" +LTO:pn-libpam = "" +LTO:pn-elfutils = "" +LTO:pn-perl = "" +LTO:pn-busybox = "" +LTO:pn-libxcrypt = "" +LTO:pn-curl = "" +LTO:pn-libcap = "" +LTO:pn-libproxy = "" +LTO:pn-libbsd = "" +LTO:pn-perf = "" +# webkit is not linking properly with LTO, disable until next time +LTO:pn-webkitgtk = "" +LTO:pn-xserver-xorg = "" +LTO:pn-grub = "" +LTO:pn-grub-efi = "" + +# Custom LTO flags +# disable partitioning/streaming algorithm since its uses ASM +# constructs not compatible with lto +LTOEXTRA:pn-alsa-lib = "-flto-partition=none" + +LTOEXTRA ?= "" + +# Override it for additional or different options if needed e.g. +# with clang thin-lto might be better for compile speed +# +# ffat-lto-objects +# object files that contain both the intermediate +# language and the object code. This makes them +# usable for both LTO linking and normal linking +# +# -fuse-linker-plugin +# ensures that libraries participate in LTO by supplying intermediate +# code from .a files to linker +LTO ?= "-flto -ffat-lto-objects -fuse-linker-plugin ${LTOEXTRA}" + +SELECTED_OPTIMIZATION:append = "${@bb.utils.contains('DISTRO_FEATURES', 'lto', ' ${LTO}', '', d)}" +TARGET_LDFLAGS:append:class-target = "${@bb.utils.contains('DISTRO_FEATURES', 'lto', ' ${LTO}', '', d)}" + +SELECTED_OPTIMIZATION[vardeps] += "LTO LTOEXTRA" |