Created attachment 917117 [details, diff] mrustc-0.11.2-compiler_is_gcc.patch dev-lang/mrustc requires CC=gcc when building Rust code. A quick and dirty patch (attached) prevents mrustc from passing GCC-specific arguments to Clang, however Clang fails to compile the transpiled `compiler_builtins` rust sources when building the mrustc stdlib: ``` output-1.74.0/libcompiler_builtins-0_1_101_H10c.rlib.c:14350:84: error: invalid input constraint '0' in asm 14350 | __asm__ __volatile__("div %2;\n " : "+r" (asm_rax), "+r" (asm_rdx) : "r" (var48), "0" (asm_rax), "1" (... | ^ output-1.74.0/libcompiler_builtins-0_1_101_H10c.rlib.c:14400:83: error: invalid input constraint '0' in asm 14400 | __asm__ __volatile__("div %2;\n " : "+r" (asm_rax), "+r" (asm_rdx) : "r" (var3), "0" (asm_rax), "1" (a... | . . . ``` This is not really unexpected - GCC is the supported upstream compiler. Still, we can see if there's an easy win here, or someone that knows compilers better than I can have a go at making CC=clang work.
