diff options
Diffstat (limited to 'build.rs')
| -rw-r--r-- | build.rs | 28 |
1 files changed, 21 insertions, 7 deletions
@@ -48,15 +48,29 @@ fn is_windows_target() -> bool { } fn use_msvc_asm() -> bool { - // cc assumes if it is passed .asm and targetting MSVC that it can use the - // Microsoft assemblers, which isn't true when we're not on a Windows - // host, but are cross-compiling with clang-cl, so we explicitly check if - // we're on a Windows host (with the assumption they'll have the MSVC - // toolchain installed if they are, though that's not necessarily true) - if env::var("CARGO_CFG_TARGET_ENV").unwrap_or_default() == "gnu" { + const MSVC_NAMES: &[&str] = &["", "cl", "cl.exe"]; + let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap_or_default(); + let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap_or_default(); + let target_windows_msvc = target_os == "windows" && target_env == "msvc"; + let host_triple = env::var("HOST").unwrap_or_default(); + let target_triple = env::var("TARGET").unwrap_or_default(); + let cross_compiling = host_triple != target_triple; + let cc = env::var("CC").unwrap_or_default().to_ascii_lowercase(); + if !target_windows_msvc { + // We are not building for Windows with the MSVC toolchain. false + } else if !cross_compiling && MSVC_NAMES.contains(&&*cc) { + // We are building on Windows with the MSVC toolchain (and not cross-compiling for another architecture or target). + true } else { - env::var("HOST").unwrap_or_default().contains("-windows-") + // We are cross-compiling to Windows with the MSVC toolchain. + let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap_or_default(); + let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap_or_default(); + let cc = env::var(format!("CC_{target_arch}_{target_vendor}_windows_msvc")) + .unwrap_or_default() + .to_ascii_lowercase(); + // Check if we are using the MSVC compiler. + MSVC_NAMES.contains(&&*cc) } } |