Targeting arm-unknown-linux-gnueabihf fails, …-gnueabi works

[ion1]

I am trying to compile rust (HEAD at 7cda0d4) using --target-triples=x86_64-unknown-linux-gnu,arm-unknown-linux-gnueabihf. The compilation fails with:

compile_and_link: x86_64-unknown-linux-gnu/stage2/lib/rustc/arm-unknown-linux-gnueabihf/lib/libstd.so
error: linking with `arm-linux-gnueabihf-gcc` failed with code 1
note: arm-linux-gnueabihf-gcc arguments: -L/home/ion/nobackup/src/rust/rust/x86_64-unknown-linux-gnu/stage2/lib/rustc/arm-unknown-linux-gnueabihf/lib -marm -o x86_64-unknown-linux-gnu/stage2/lib/rustc/arm-unknown-linux-gnueabihf/lib/libstd-6c65cf4b443341b1-0.8-pre.so x86_64-unknown-linux-gnu/stage2/lib/rustc/arm-unknown-linux-gnueabihf/lib/std.o -lrustrt -lrt -lpthread -L/home/ion/nobackup/src/rust/rust/.rust -L/home/ion/nobackup/src/rust/rust -shared -lrt -ldl -lm -lmorestack -lrustrt -Wl,-rpath,$ORIGIN/. -Wl,-rpath,/home/ion/nobackup/src/rust/rust/x86_64-unknown-linux-gnu/stage2/lib/rustc/arm-unknown-linux-gnueabihf/lib -Wl,-rpath,/usr/local/lib/rustc/arm-unknown-linux-gnueabihf/lib
note: /usr/lib/gcc-cross/arm-linux-gnueabihf/4.7/../../../../arm-linux-gnueabihf/bin/ld: error: x86_64-unknown-linux-gnu/stage2/lib/rustc/arm-unknown-linux-gnueabihf/lib/libstd-6c65cf4b443341b1-0.8-pre.so uses VFP register arguments, x86_64-unknown-linux-gnu/stage2/lib/rustc/arm-unknown-linux-gnueabihf/lib/std.o does not
/usr/lib/gcc-cross/arm-linux-gnueabihf/4.7/../../../../arm-linux-gnueabihf/bin/ld: failed to merge target specific data of file x86_64-unknown-linux-gnu/stage2/lib/rustc/arm-unknown-linux-gnueabihf/lib/std.o
collect2: error: ld returned 1 exit status

(Full log)

Compilation succeeds with a non-hf gnueabi target.

[emberian]

/cc @yichoi @sanxiyn @luqmana

[pnkfelix]

I have replicated this. (I had not previously tried building gnueabi instead of gnueabihf.)

[yichoi]

I've tested with ubuntu packages arm-linux-gnueabi-* and arm-linux-gnueabihf-*.
As tilted, gnueabi works and gnueabihf fails.

In case of gnueabihf, readelf results are

File: librustrt.so
Attribute Section: aeabi
File Attributes
  Tag_CPU_name: "7-A"
  Tag_CPU_arch: v7
  Tag_CPU_arch_profile: Application
  Tag_ARM_ISA_use: Yes
  Tag_THUMB_ISA_use: Thumb-2
  Tag_FP_arch: VFPv3-D16
  Tag_ABI_PCS_wchar_t: 4
  Tag_ABI_FP_rounding: Needed
  Tag_ABI_FP_denormal: Needed
  Tag_ABI_FP_exceptions: Needed
  Tag_ABI_FP_number_model: IEEE 754
  Tag_ABI_align_needed: 8-byte
  Tag_ABI_enum_size: int
  Tag_ABI_HardFP_use: SP and DP
  Tag_ABI_VFP_args: VFP registers <------------------ VFP!
  Tag_CPU_unaligned_access: v6

File: std.o
Attribute Section: aeabi
File Attributes
  Tag_CPU_arch: v7
  Tag_CPU_arch_profile: Application
  Tag_ARM_ISA_use: Yes
  Tag_THUMB_ISA_use: Thumb-2
  Tag_ABI_FP_denormal: Needed
  Tag_ABI_FP_exceptions: Needed
  Tag_ABI_FP_number_model: IEEE 754
  Tag_ABI_align_needed: 8-byte
  Tag_ABI_align_preserved: 8-byte, except leaf SP

std.o for libstd.so is not armhf binary.
At least, llvm should be triggered to generate armhf code

[luqmana]

Yep, seems like LLVM defaults to soft floats on ARM.