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build(windows): add support for gnullvm targets #399

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Jul 17, 2024
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build(windows): add support for gnullvm targets #399

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8 changes: 6 additions & 2 deletions build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -74,7 +74,7 @@ fn is_big_endian() -> bool {
endianness() == "big"
}

// Windows targets may be using the MSVC toolchain or the GNU toolchain. The
// Windows targets may be using the MSVC toolchain or the MinGW toolchain. The
// right compiler flags to use depend on the toolchain. (And we don't want to
// use flag_if_supported, because we don't want features to be silently
// disabled by old compilers.)
Expand All @@ -85,11 +85,15 @@ fn is_windows_msvc() -> bool {
&& target_components()[3] == "msvc"
}

// MinGW toolchain uses 2 different targets depending on the main compiler.
// Target for a general MinGW toolchain ends with `-gnu` (GCC is used as C
// compiler). Target for a LLVM-MinGW toolchain (Clang is used as C compiler)
// ends with `-gnullvm`.
fn is_windows_gnu() -> bool {
// Some targets are only two components long, so check in steps.
target_components()[1] == "pc"
&& target_components()[2] == "windows"
&& target_components()[3] == "gnu"
&& target_components()[3] != "msvc"
}

fn new_build() -> cc::Build {
Expand Down