[I experiment with targeting powerpc family members with
modern tool chains. In this case trying to use
devel/xtoolchain-llvm60 . This was indirectly reached via
commenting on a bugzilla entry for something else powerpc
family related.]
BEGIN setup notes:
Because of (at least) lld problems for targeting powerpc family members,
the following is based on an alternate toolchains/*.mk :
# diff /usr/local/share/toolchains/llvm60.mk
/usr/local/share/toolchains/llvm60_altbinutils.mk
4,5c4,5
< XLD=/usr/local/llvm60/bin/ld.lld
< CROSS_BINUTILS_PREFIX=/var/empty
---
> #XLD=/usr/local/llvm60/bin/ld.lld
> #CROSS_BINUTILS_PREFIX=/var/empty
This is to allow setting up the use of:
CROSS_BINUTILS_PREFIX=/usr/local/powerpc64-unknown-freebsd12.0/bin/
END Setup notes.
The below is from adding a -v to what the .meta file showed for the failing
command.
Note the "-cc1as -triple i386-portbld-freebsd12.0" and "-target-cpu i486" that
results
from buildworld’s lib32 related command that tries to compile assembly source
for
powerpc.
# /usr/local/bin/clang60 -v -DCOMPAT_32BIT -mcpu=powerpc -m32
-L/usr/obj/powerpc64vtsc_xtoolchain-llvm/powerpc.powerpc64/usr/src/powerpc.powerpc64/obj-lib32/tmp/usr/lib32
tosysroot=/usr/obj/powerpc64vtsc_xtoolchain-llvm/powerpc.powerpc64/usr/src/powerpc.powerpc64/obj-lib32/tmp
-B/usr/local/powerpc64-unknown-freebsd12.0/bin -B/usr/obj/powerpc64vtsc_x
-Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes
-Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings
-Wswitch -Wshadow -Wunused-parameter -Wcast-align -Wchar-subscripts -Winline
-Wnested-externs -Wredundant-decls -Wold-style-definition -Wno-pointer-sign
-Wthread-safety -Wno-empty-body -Wno-string-plus-int -Wno-unused-const-variable
-Qunused-arguments -c /usr/src/lib/csu/powerpc/crtn.S -o
crtn.ole-definition -Wno-pointer-sign -Wthread-safety -Wno-empty-body
-Wno-string-plus-int -Wno-unus
clang version 6.0.0 (tags/RELEASE_600/final)/usr/src/lib/csu/powerpc/crtn.S -o
crtn.o
Target: i386-portbld-freebsd12.0
Thread model: posix
InstalledDir: /usr/local/llvm60/bin
"/usr/local/llvm60/bin/clang-6.0" -cc1 -triple i386-portbld-freebsd12.0 -E
-disable-free -main-file-name crtn.S -mrelocation-model static -mthread-model
posix -mdisable-fp-elim -masm-verbose -mconstructor-aliases -target-cpu i486
-dwarf-column-info -debug-info-kind=standalone -dwarf-version=2
-debugger-tuning=gdb -v -coverage-notes-file /usr/src/crtn.gcno -resource-dir
/usr/local/llvm60/lib/clang/6.0.0 -D COMPAT_32BIT -I /usr/src/lib/csu/common -I
/usr/src/lib/libc/include -isysroot
/usr/obj/powerpc64vtsc_xtoolchain-llvm/powerpc.powerpc64/usr/src/powerpc.powerpc64/obj-lib32/tmp
-O2 -Wsystem-headers -Wall -Wno-format-y2k -W -Wno-unused-parameter
-Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type
-Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wunused-parameter -Wcast-align
-Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls
-Wold-style-definition -Wno-pointer-sign -Wthread-safety -Wno-empty-body
-Wno-string-plus-int -Wno-unused-const-variable -std=gnu99 -fconst-strings
-fdebug-compilation-dir /usr/src -ferror-limit 19 -fmessage-length 180
-fobjc-runtime=gnustep -fdiagnostics-show-option -vectorize-loops
-vectorize-slp -o /tmp/crtn-d80df9.s -x assembler-with-cpp
/usr/src/lib/csu/powerpc/crtn.S
clang -cc1 version 6.0.0 based upon LLVM 6.0.0 default target
x86_64-portbld-freebsd12.0
#include "..." search starts here:
#include <...> search starts here:
/usr/src/lib/csu/common
/usr/src/lib/libc/include
/usr/local/llvm60/lib/clang/6.0.0/include
/usr/obj/powerpc64vtsc_xtoolchain-llvm/powerpc.powerpc64/usr/src/powerpc.powerpc64/obj-lib32/tmp/usr/include
End of search list.
"/usr/local/llvm60/bin/clang-6.0" -cc1as -triple i386-portbld-freebsd12.0
-filetype obj -main-file-name crtn.S -target-cpu i486 -I
/usr/src/lib/csu/common -I /usr/src/lib/libc/include -fdebug-compilation-dir
/usr/src -dwarf-debug-producer clang version 6.0.0 (tags/RELEASE_600/final) -I
/usr/src/lib/csu/common -I /usr/src/lib/libc/include -debug-info-kind=limited
-dwarf-version=2 -mrelocation-model static -o crtn.o /tmp/crtn-d80df9.s
/usr/src/lib/csu/powerpc/crtn.S:29:2: warning: DWARF2 only supports one section
per compilation unit
.section .init,"ax",@progbits
^
/usr/src/lib/csu/powerpc/crtn.S:30:11: error: unexpected token in memory operand
lwz 11,0(1)
^
/usr/src/lib/csu/powerpc/crtn.S:31:10: error: unexpected token in memory operand
lwz 0,4(11)
^
/usr/src/lib/csu/powerpc/crtn.S:32:2: error: invalid instruction mnemonic 'mtlr'
mtlr 0
^~~~
. . .
It would appear that a -triple may be missing in the /usr/local/bin/clang60
command line that would specify the specific ABI to target. It appears that
the -mcpu=powerpc is not enough to even get the cpu family right as far as
what assembler notation to process.
I do not know if an appropriate -triple addition would currently be
sufficient for things to start working.
Something needs to cause the right assembler notation to be processed for
lib32 if WITH_LIB32= is to be supported for cross builds.
===
Mark Millard
marklmi26-fbsd at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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