[cfe-dev] Clang accepts x86 specific options when cross compiling for arm

[Craig Topper via cfe-dev]

You should have gotten an "argument unused during compilation" warning that
you can promote to an error.

~Craig

On Wed, Jul 26, 2017 at 5:41 PM, Khem Raj via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hi
>
> I am compiling a package which pokes at compiler for -msse4.2 option and
> if compiler accepts it then it happily adds the intel specific
> intrinsics to code path. This works fine in cross compile environment
> with gcc since gcc when configure for cross compiling for arm targets
> rejects this option however with clang, configured for multiple targets
>
> LLVM_TARGETS_TO_BUILD = "AArch64;ARM;Mips;PowerPC;X86"
>
> it happily accepts -msse4.2 when called to cross compile for arm.
>
> arm-bec-linux-gnueabi-clang -mthumb -mfpu=neon-vfpv4 -mfloat-abi=hard
> -mcpu=cortex-a7 -mlittle-endian -march=armv7a
> --sysroot=/mnt/a/oe/build/tmp/work/cortexa7t2hf-neon-vfpv4-
> bec-linux-gnueabi/leveldb/1.20+gitAUTOINC+a53934a3ae-r0/recipe-sysroot
>  -O2 -msse4.2
> clang-5.0: error: no input files
>
> I believe it would be better if clang could cross check for target
> options and error out and flag these kind of incompatible combinations
>
> may be there is already an option to do so, I would be happy to know
> since this would fix my issue once for all.
>
> Thanks
> -Khem
>
>
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