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Patches for LTO in the clang toolchain #1139

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Patches for LTO in the clang toolchain #1139

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f3ce171
clang-legacy: Add -ffat-lto-objects to LTO settings
markyang92 Nov 7, 2025
ad35ad0
nonclangable.conf: Disable LTO for bluez5,systemd-boot, zlib
markyang92 Nov 7, 2025
ca4c22b
clang-legacy.bbclass: Remove -fuse-ld=lld from SELECTED_OPTIMIZATION …
markyang92 Nov 7, 2025
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5 changes: 3 additions & 2 deletions classes/clang-legacy.bbclass
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
# Add the necessary override
LTO:toolchain-clang:class-target = "${@bb.utils.contains('DISTRO_FEATURES', 'thin-lto', '-flto=thin', '-flto -fuse-ld=lld', d)}"
LTO:toolchain-clang:class-nativesdk = "${@bb.utils.contains('DISTRO_FEATURES', 'thin-lto', '-flto=thin', '-flto -fuse-ld=lld', d)}"
LTO:toolchain-clang:class-target = "${@bb.utils.contains('DISTRO_FEATURES', 'thin-lto', '-flto=thin -ffat-lto-objects', '-flto -ffat-lto-objects -fuse-ld=lld', d)}"
LTO:toolchain-clang:class-nativesdk = "${@bb.utils.contains('DISTRO_FEATURES', 'thin-lto', '-flto=thin -ffat-lto-objects', '-flto -ffat-lto-objects -fuse-ld=lld', d)}"
SELECTED_OPTIMIZATION:remove:toolchain-clang = "${@bb.utils.contains('DISTRO_FEATURES', 'lto', '-fuse-ld=lld', '', d)}"

# Reconcile some ppc anamolies
TUNE_CCARGS:remove:toolchain-clang:powerpc = "-mhard-float -mno-spe"
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9 changes: 9 additions & 0 deletions conf/nonclangable.conf
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Expand Up @@ -361,6 +361,15 @@ LTO:pn-libidn2:toolchain-clang = ""
#libcairo.so: undefined reference to pthread_mutexattr_init [--no-allow-shlib-undefined]
LTO:pn-cairo:toolchain-clang = ""

# zlib does not build with lld, keep it until https://github.com/madler/zlib/pull/936
# is addressed
# When not using the lld linker and using the bfd linker, the LLVMgold.so plugin must be used, but the gold linker has been deprecated.
LTO:pn-zlib:toolchain-clang = ""

# When not using the lld linker and using the bfd linker, the LLVMgold.so plugin must be used, but the gold linker has been deprecated.
LTO:pn-bluez5:toolchain-clang = ""
LTO:pn-systemd-boot:toolchain-clang = ""

# Subprocess output:mips-yoe-linux-llvm-objcopy: error: Link field value 22 in section .rel.dyn is not a symbol table
# also seen on riscv64 and x86-64
OBJCOPY:pn-linux-variscite:toolchain-clang = "${HOST_PREFIX}objcopy"
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