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cleanup and fix compiling of libunwind

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fix conditional compiling of llvm-libunwind feaure for musl target.
update document of llvm-libunwind feature.
This commit is contained in:
12101111
2021-05-24 17:53:09 +08:00
parent 126561cb31
commit 52a33655be
4 changed files with 105 additions and 75 deletions
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21
library/unwind/src/lib.rs
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@@ -37,9 +37,22 @@ cfg_if::cfg_if! {
}
#[cfg(target_env = "musl")]
#[link(name = "unwind", kind = "static", cfg(target_feature = "crt-static"))]
#[link(name = "gcc_s", cfg(not(target_feature = "crt-static")))]
extern "C" {}
cfg_if::cfg_if! {
if #[cfg(all(feature = "llvm-libunwind", feature = "system-llvm-libunwind"))] {
compile_error!("`llvm-libunwind` and `system-llvm-libunwind` cannot be enabled at the same time");
} else if #[cfg(feature = "llvm-libunwind")] {
#[link(name = "unwind", kind = "static")]
extern "C" {}
} else if #[cfg(feature = "system-llvm-libunwind")] {
#[link(name = "unwind", kind = "static-nobundle", cfg(target_feature = "crt-static"))]
#[link(name = "unwind", cfg(not(target_feature = "crt-static")))]
extern "C" {}
} else {
#[link(name = "unwind", kind = "static", cfg(target_feature = "crt-static"))]
#[link(name = "gcc_s", cfg(not(target_feature = "crt-static")))]
extern "C" {}
}
}
// When building with crt-static, we get `gcc_eh` from the `libc` crate, since
// glibc needs it, and needs it listed later on the linker command line. We
@@ -68,5 +81,5 @@ extern "C" {}
extern "C" {}
#[cfg(all(target_vendor = "fortanix", target_env = "sgx"))]
#[link(name = "unwind", kind = "static-nobundle")]
#[link(name = "unwind", kind = "static")]
extern "C" {}