std: Set has_reliable_f16 to false for MIPS targets in build.rs

To avoid this linker error: $ sudo apt install libc6-mips-cross gcc-mips-linux-gnu $ CC_mips_unknown_linux_gnu=mips-linux-gnu-gcc \ CARGO_TARGET_MIPS_UNKNOWN_LINUX_GNU_LINKER=mips-linux-gnu-gcc \ ./x test library/std --target mips-unknown-linux-gnu undefined reference to `__gnu_f2h_ieee' You get the same linker error also with mipsel, mips64 and mips64el toolchains.

Author: Martin Nordholts

std/build.rs

@@ -100,6 +100,8 @@ fn main() {
  ("x86" | "x86_64", _) => false,
  // Missing `__gnu_h2f_ieee` and `__gnu_f2h_ieee`
  ("powerpc" | "powerpc64", _) => false,
+ // Missing `__gnu_h2f_ieee` and `__gnu_f2h_ieee`
+ ("mips" | "mips32r6" | "mips64" | "mips64r6", _) => false,
  // Missing `__extendhfsf` and `__truncsfhf`
  ("riscv32" | "riscv64", _) => false,
  // Most OSs are missing `__extendhfsf` and `__truncsfhf`