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a7762efa03
With gcc 11.1, compiling grub with LTO causes an internal compiler error (ICE), and with gcc 10.2, files under /usr/lib/grub/i386-pc/*.mod are not binary reproducible. [YOCTO #14490] (gcc 11.1 ICE) [YOCTO #14481] (LTO and binary reproducibility) (From OE-Core rev: d1fd3693411d83214f0f88b2f9d7aef12ecd6e02) Signed-off-by: Tony Battersby <tonyb@cybernetics.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
52 lines
1.5 KiB
PHP
52 lines
1.5 KiB
PHP
# To enable LTO, add following in local.conf
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# require conf/distro/include/lto.inc
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# DISTRO_FEATURES:append = " lto"
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#
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# Disable LTO for following packages
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LTO:pn-glibc = ""
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LTO:pn-gcc-runtime = ""
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LTO:pn-libgcc-initial = ""
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LTO:pn-libgcc = ""
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LTO:pn-libaio = ""
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LTO:pn-libpam = ""
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LTO:pn-elfutils = ""
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LTO:pn-perl = ""
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LTO:pn-busybox = ""
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LTO:pn-libxcrypt = ""
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LTO:pn-curl = ""
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LTO:pn-libcap = ""
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LTO:pn-libproxy = ""
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LTO:pn-libbsd = ""
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LTO:pn-perf = ""
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# webkit is not linking properly with LTO, disable until next time
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LTO:pn-webkitgtk = ""
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LTO:pn-xserver-xorg = ""
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LTO:pn-grub = ""
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LTO:pn-grub-efi = ""
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# Custom LTO flags
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# disable partitioning/streaming algorithm since its uses ASM
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# constructs not compatible with lto
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LTOEXTRA:pn-alsa-lib = "-flto-partition=none"
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LTOEXTRA ?= ""
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# Override it for additional or different options if needed e.g.
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# with clang thin-lto might be better for compile speed
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#
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# ffat-lto-objects
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# object files that contain both the intermediate
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# language and the object code. This makes them
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# usable for both LTO linking and normal linking
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#
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# -fuse-linker-plugin
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# ensures that libraries participate in LTO by supplying intermediate
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# code from .a files to linker
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LTO ?= "-flto -ffat-lto-objects -fuse-linker-plugin ${LTOEXTRA}"
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SELECTED_OPTIMIZATION:append = "${@bb.utils.contains('DISTRO_FEATURES', 'lto', ' ${LTO}', '', d)}"
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TARGET_LDFLAGS:append:class-target = "${@bb.utils.contains('DISTRO_FEATURES', 'lto', ' ${LTO}', '', d)}"
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SELECTED_OPTIMIZATION[vardeps] += "LTO LTOEXTRA"
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