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Revert "Avoid using TARGET_ARCH in llvm.build.mk"

This reverts commit 8534e6be81, and adds
a cautionary note that there are dragons about that should be considered
when changing it.

PR:		267026
Reviewed by:	dim, imp
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D36981
This commit is contained in:
Kyle Evans 2022-10-13 22:04:47 -05:00
parent 2e0e273927
commit ed7910fbac

View File

@ -30,21 +30,26 @@ CFLAGS+= -DHAVE_VCS_VERSION_INC
CFLAGS+= -DNDEBUG
.endif
# Note that using TARGET_ARCH here is essential for a functional native-xtools
# build! For native-xtools, we're building binaries that will work on the
# *host* machine (MACHINE_ARCH), but they should default to producing binaries
# for the *target* machine (TARGET_ARCH).
TARGET_ARCH?= ${MACHINE_ARCH}
BUILD_ARCH?= ${MACHINE_ARCH}
# Armv6 and armv7 uses hard float abi, unless the CPUTYPE has soft in it.
# arm (for armv4 and armv5 CPUs) always uses the soft float ABI.
# For all other targets, we stick with 'unknown'.
.if ${MACHINE_ARCH:Marmv[67]*} && (!defined(CPUTYPE) || ${CPUTYPE:M*soft*} == "")
.if ${TARGET_ARCH:Marmv[67]*} && (!defined(CPUTYPE) || ${CPUTYPE:M*soft*} == "")
TARGET_TRIPLE_ABI= -gnueabihf
.elif ${MACHINE_ARCH:Marm*}
.elif ${TARGET_ARCH:Marm*}
TARGET_TRIPLE_ABI= -gnueabi
.else
TARGET_TRIPLE_ABI=
.endif
VENDOR= unknown
LLVM_TARGET_TRIPLE?= ${MACHINE_ARCH:C/amd64/x86_64/:C/[hs]f$//:S/mipsn32/mips64/}-${VENDOR}-freebsd${OS_REVISION}${TARGET_TRIPLE_ABI}
LLVM_TARGET_TRIPLE?= ${TARGET_ARCH:C/amd64/x86_64/:C/[hs]f$//:S/mipsn32/mips64/}-${VENDOR}-freebsd${OS_REVISION}${TARGET_TRIPLE_ABI}
LLVM_BUILD_TRIPLE?= ${BUILD_ARCH:C/amd64/x86_64/:C/[hs]f$//:S/mipsn32/mips64/}-${VENDOR}-freebsd${OS_REVISION}
CFLAGS+= -DLLVM_DEFAULT_TARGET_TRIPLE=\"${LLVM_TARGET_TRIPLE}\"