Nick Desaulniers 904ccb4cd1 kbuild: fix linker feature test macros when cross compiling with Clang ... commit 86a9df597c upstream. I was not seeing my linker flags getting added when using ld-option when cross compiling with Clang. Upon investigation, this seems to be due to a difference in how GCC vs Clang handle cross compilation. GCC is configured at build time to support one backend, that is implicit when compiling. Clang is explicit via the use of `-target <triple>` and ships with all supported backends by default. GNU Make feature test macros that compile then link will always fail when cross compiling with Clang unless Clang's triple is passed along to the compiler. For example: $ clang -x c /dev/null -c -o temp.o $ aarch64-linux-android/bin/ld -E temp.o aarch64-linux-android/bin/ld: unknown architecture of input file `temp.o' is incompatible with aarch64 output aarch64-linux-android/bin/ld: warning: cannot find entry symbol _start; defaulting to 0000000000400078 $ echo $? 1 $ clang -target aarch64-linux-android- -x c /dev/null -c -o temp.o $ aarch64-linux-android/bin/ld -E temp.o aarch64-linux-android/bin/ld: warning: cannot find entry symbol _start; defaulting to 00000000004002e4 $ echo $? 0 This causes conditional checks that invoke $(CC) without the target triple, then $(LD) on the result, to always fail. Suggested-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Matthias Kaehlcke <mka@chromium.org> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> [nc: Fix conflicts due to lack of commit 3298b690b2 in linux-4.4.y Use KBUILD_CFLAGS instead of CC_OPTION_FLAGS because commit d26e941492 that introduced that variable isn't in 4.4 either] Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-11-27 16:07:58 +01:00
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basic
coccinelle
dtc
gdb
genksyms	genksyms: Fix segfault with invalid declarations	2018-02-25 11:03:51 +01:00
kconfig	kconfig: Avoid format overflow warning from GCC 8.1	2018-06-13 16:15:27 +02:00
ksymoops
mod	kbuild: Consolidate header generation from ASM offset information	2018-11-27 16:07:57 +01:00
package	kbuild: pkg: use --transform option to prefix paths in tar	2017-12-16 10:33:54 +01:00
selinux
tracing
.gitignore
analyze_suspend.py
asn1_compiler.c
bloat-o-meter
bootgraph.pl
check_extable.sh
check-lc_ctype.c
checkincludes.pl
checkkconfigsymbols.py
checkpatch.pl
checkstack.pl
checksyscalls.sh
checkversion.pl
cleanfile
cleanpatch
coccicheck
config
conmakehash.c
decode_stacktrace.sh
decodecode
depmod.sh	kbuild: make missing $DEPMOD a Warning instead of an Error	2018-09-15 09:40:40 +02:00
diffconfig
docproc.c
export_report.pl
extract-cert.c
extract-ikconfig
extract-module-sig.pl
extract-sys-certs.pl
extract-vmlinux
gcc-goto.sh
gcc-ld
gcc-version.sh
gcc-x86_32-has-stack-protector.sh
gcc-x86_64-has-stack-protector.sh
gen_initramfs_list.sh
get_maintainer.pl
gfp-translate
headerdep.pl
headers_check.pl
headers_install.sh
headers.sh
kallsyms.c
Kbuild.include	kbuild: fix linker feature test macros when cross compiling with Clang	2018-11-27 16:07:58 +01:00
kernel-doc	scripts/kernel-doc: Don't fail with status != 0 if error encountered with -none	2018-02-25 11:03:39 +01:00
kernel-doc-xml-ref
ld-version.sh
Lindent
link-vmlinux.sh
Makefile
Makefile.asm-generic
Makefile.build	kbuild: Add support to generate LLVM assembly files	2018-11-27 16:07:58 +01:00
Makefile.clean
Makefile.dtbinst
Makefile.extrawarn	kbuild: drop -Wno-unknown-warning-option from clang options	2018-11-27 16:07:57 +01:00
Makefile.fwinst
Makefile.headersinst
Makefile.help
Makefile.host
Makefile.kasan	kasan: don't emit builtin calls when sanitization is off	2018-08-17 20:56:44 +02:00
Makefile.lib	kbuild: fix asm-offset generation to work with clang	2018-11-27 16:07:57 +01:00
Makefile.modbuiltin
Makefile.modinst
Makefile.modpost
Makefile.modsign
makelst
markup_oops.pl
mkcompile_h
mkmakefile
mksysmap
mkuboot.sh
mkversion
module-common.lds
namespace.pl
objdiff
patch-kernel
pnmtologo.c
profile2linkerlist.pl
recordmcount.c
recordmcount.h
recordmcount.pl
setlocalversion
show_delta
sign-file.c
sortextable.c
sortextable.h
spelling.txt
stackdelta
stackusage
tags.sh	tags: honor COMPILED_SOURCE with apart output directory	2018-04-13 19:50:18 +02:00
unifdef.c
ver_linux
xen-hypercalls.sh
xz_wrap.sh