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For arm and armv6, only enable LLVM target support for arm by default,

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to shrink libllvm.a.

This is a workaround for "relocation truncated to fit" errors with BFD
ld 2.17.50 on arm and armv6, when linking executables against it.

The required range extensions are not yet supported by this very old
version of BFD ld.  When arm and armv6 userland can be successfully
linked by lld, this workaround can be removed.
This commit is contained in:
Dimitry Andric 2018-12-11 06:45:53 +00:00
parent 67350cb56a
commit 12401698f6
1 changed files with 4 additions and 0 deletions
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4
share/mk/src.opts.mk
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@ -269,6 +269,10 @@ __LLVM_TARGET_FILT= C/(amd64|i386)/x86/:S/sparc64/sparc/:S/arm64/aarch64/
# Default the given TARGET's LLVM_TARGET support to the value of MK_CLANG.
.if ${__TT:${__LLVM_TARGET_FILT}} == ${__llt}
__DEFAULT_DEPENDENT_OPTIONS+= LLVM_TARGET_${__llt:${__LLVM_TARGET_FILT}:tu}/CLANG
# Disable other targets for arm and armv6, to work around "relocation truncated
# to fit" errors with BFD ld, since libllvm.a will get too large to link.
.elif ${__T} == "arm" || ${__T} == "armv6"
__DEFAULT_NO_OPTIONS+=LLVM_TARGET_${__llt:tu}
# aarch64 needs arm for -m32 support.
.elif ${__TT} == "arm64" && ${__llt} == "arm"
__DEFAULT_DEPENDENT_OPTIONS+= LLVM_TARGET_ARM/LLVM_TARGET_AARCH64