11.0 -r300944 buildworld attempt failed [amd64 targeting powerpc via system clang use]

[It may well be that powerpc is not an intended cross compile target via clang since clang is insufficient for an FreeBSD/powerpc ABI compliant buildworld as stands. Still I use this to illustrate the more general points for clang use in cross builds.]

The failure:

> --- libc.so.7.full ---
> /usr/bin/ld: unrecognised emulation mode: elf32ppc_fbsd
> Supported emulations: elf_x86_64_fbsd elf_i386_fbsd
> clang: error: linker command failed with exit code 1 (use -v to see invocation)
> *** [libc.so.7.full] Error code 1
> 
> make[4]: stopped in /usr/src/lib/libc
> 1 error
> 
> make[4]: stopped in /usr/src/lib/libc
> *** [lib/libc__L] Error code 2

Note the /usr/bin/ld use: the host (amd64) linker for a powerpc link operation.

The log shows the ld command was via clang’s front end as far as what the build did directly (just a prefix shown):

> --- libc.so.7.full ---
> /usr/bin/clang -target powerpc-unknown-freebsd11.0 --sysroot=/usr/obj/clang/powerpc.powerpc/usr/src/tmp -B/usr/obj/clang/powerpc.powerpc/usr/src/tmp/usr/bin  -nodefaultlibs -Wl,--version-script=Version.map  -shared -Wl,-x -Wl,--fatal-warnings -Wl,--warn-shared-textrel  -o libc.so.7.full -Wl,-soname,libc.so.7  `NM='nm' NMFLAGS='' lorder trivial-vdso_tc.So bt_close.So bt_conv.So bt_debug.So bt_delete.So bt_get.So bt_open.So bt_overflow.So bt_page.So
. . .

The -B does not point to a place with a powerpc specific ld command:

> # ls -lt /usr/obj/clang/powerpc.powerpc/usr/src/tmp/usr/bin
> total 1395
> -rwxr-xr-x   1 root  wheel  827248 May 29 22:20 ctfmerge
> -rwxr-xr-x   1 root  wheel  534712 May 29 22:20 sysinit
> -rwxr-xr-x   1 root  wheel  960784 May 29 22:20 ctfconvert

As far as I can tell a potentially proper path would have been:

/usr/local/powerpc-freebsd/bin/ld

if a devel/powerpc-binutils port existed and was installed. (No such port exists.)

I do not know if other TARGET_ARCH’s have similar problems or not (even if they have a binutils port).


This was not a WITH_META_MODE=yes context.


make.conf was empty and src.conf was:

TO_TYPE=powerpc
#
KERNCONF=GENERICvtsc-NODEBUG
TARGET=${TO_TYPE}
.if ${.MAKE.LEVEL} == 0
TARGET_ARCH=${TO_TYPE}
.export TARGET_ARCH
.endif
#
WITHOUT_CROSS_COMPILER=
WITH_SYSTEM_COMPILER=
#
WITH_LIBCPLUSPLUS=
WITH_BINUTILS_BOOTSTRAP=
WITH_CLANG=
WITH_CLANG_IS_CC=
WITH_CLANG_FULL=
WITH_CLANG_EXTRAS=
# lldb requires missing atomic 8-byte operations for powerpc (non-64)
WITHOUT_LLDB=
#
WITH_BOOT=
WITHOUT_LIB32=
#
WITHOUT_GCC_BOOTSTRAP=
WITHOUT_GCC=
WITHOUT_GCC_IS_CC=
WITHOUT_GNUCXX=
#
NO_WERROR=
#WERROR=
MALLOC_PRODUCTION=
#
WITH_DEBUG_FILES=


===
Mark Millard
markmi at dsl-only.net