target spec: add an asm-args field to pass arguments to the external .. #38463
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assembler
The main use case is the (still out of tree) msp430 target. For that target we use an external assembler,
mps430-elf-gcc
, to produce object files from the assembly rustc/llvm outputs. The problem is that by defaultmsp430-elf-gcc
produces object files for the MSP430X ABI but we want to use produce objects using the MSP430 (note: no X) ABI. To do that we have to pass-mcpu=msp430
to the assembler and that's what this flag is for.r? @alexcrichton
cc @pftbest