Makefile: clang: fail non-sandbox LLVM builds early

For the reasons outlines in aaea175ad00f
("Makefile: clang: fail non-sandbox LLVM builds early"), restore
sandbox-only clang support.

The code that has been imported here is wrong anyway, because it doesn't
account for the fact that SRCARCH in barebox is never arm64, even for
CONFIG_ARM64. This is not trivially fixable either as this file is
included before CONFIG_ options are available, so we can't actually know
whether it's arm64 or arm32...

Signed-off-by: Ahmad Fatoum <[email protected]>
---
 scripts/Makefile.clang | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/scripts/Makefile.clang b/scripts/Makefile.clang
index e93ffb77aa10..4e4b620e1645 100644
--- a/scripts/Makefile.clang
+++ b/scripts/Makefile.clang
@@ -2,15 +2,7 @@
 # Individual arch/{arch}/Makefiles should use -EL/-EB to set intended
 # endianness and -m32/-m64 to set word size based on Kconfigs instead of
 # relying on the target triple.
-CLANG_TARGET_FLAGS_arm         := arm-linux-gnueabi
-CLANG_TARGET_FLAGS_arm64       := aarch64-linux-gnu
-CLANG_TARGET_FLAGS_mips                := mipsel-linux-gnu
-CLANG_TARGET_FLAGS_powerpc     := powerpc64le-linux-gnu
-CLANG_TARGET_FLAGS_riscv       := riscv64-linux-gnu
-CLANG_TARGET_FLAGS_x86         := x86_64-linux-gnu
-# This is only for i386 UM builds, which need the 32-bit target not -m32
-CLANG_TARGET_FLAGS_i386                := i386-linux-gnu
-CLANG_TARGET_FLAGS_sandbox     := $(CLANG_TARGET_FLAGS_$(SUBARCH))
+CLANG_TARGET_FLAGS_sandbox     := $(shell $(CC) -print-target-triple)
 CLANG_TARGET_FLAGS             := $(CLANG_TARGET_FLAGS_$(SRCARCH))
 
 ifeq ($(CLANG_TARGET_FLAGS),)
-- 
2.47.3


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