emcc/em++ are detected as ToolFamily::Msvc

[meowtec]

introduced by: #1015
https://github.com/rust-lang/cc-rs/blob/main/src/tool.rs#L173-L174

For Msvc family, it will add -nologo as default flags., but emcc or em++ does not accept this.

[NobodyXu]

Thanks.

Does it define any macro that we could use to identify it?

We have a c source file for it, if there's a macro then we could use it.

https://github.com/rust-lang/cc-rs/blob/main/src/detect_compiler_family.c

[meowtec]

Thanks.

Does it define any macro that we could use to identify it?

We have a c source file for it, if there's a macro then we could use it.

https://github.com/rust-lang/cc-rs/blob/main/src/detect_compiler_family.c

Yes, it is __EMSCRIPTEN__.

I modified detect_compiler_family.c to this:

#ifdef __clang__
#pragma message "clang"
#endif

#ifdef __GNUC__
#pragma message "gcc"
#endif

+ #ifdef __EMSCRIPTEN__
+ #pragma message "emscripten"
+ #endif

And the stdout is:

# 1 "/path/todetect_compiler_family.c"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 413 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "path/to/detect_compiler_family.c" 2

#pragma message("clang")



#pragma message("gcc")



#pragma message("emscripten")

Hope this helps.