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Use CARGO_CFG_TARGET_FEATURE to detect CRT linkage on MSVC #1915

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Use CARGO_CFG_TARGET_FEATURE to detect CRT linkage on MSVC #1915

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5 changes: 4 additions & 1 deletion build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -804,7 +804,10 @@ fn print_link_flags() {
if target_env == "msvc" {
// On Windows, including libcpmt[d]/msvcprt[d] explicitly links the C++
// standard library, which libc++ needs for exception_ptr internals.
if env::var("CARGO_FEATURE_CRT_STATIC").is_ok() {
let crt_static = env::var("CARGO_CFG_TARGET_FEATURE")
.unwrap_or_default()
.contains("crt-static");
if crt_static {
println!("cargo:rustc-link-lib=libcpmt");
} else {
println!("cargo:rustc-link-lib=dylib=msvcprt");
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