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Fix libunwind build: Define __LITTLE_ENDIAN__ for LE targets

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If __LITTLE_ENDIAN__ is missing, libunwind assumes big endian
and reads unwinding instructions wrong on ARM EHABI.

Fix #65765
This commit is contained in:
Vojtech Kral 2019-10-30 17:51:43 +01:00 • committed by Vojtech Kral
parent c553e8e881
commit e9e4836532
1 changed files with 6 additions and 0 deletions
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6
src/libunwind/build.rs
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@ -56,12 +56,18 @@ mod llvm_libunwind {
pub fn compile() {
let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap();
let target_endian_little = env::var("CARGO_CFG_TARGET_ENDIAN").unwrap() != "big";
let cfg = &mut cc::Build::new();
cfg.cpp(true);
cfg.cpp_set_stdlib(None);
cfg.warnings(false);
// libunwind expects a __LITTLE_ENDIAN__ macro to be set for LE archs, cf. #65765
if target_endian_little {
cfg.define("__LITTLE_ENDIAN__", Some("1"));
}
if target_env == "msvc" {
// Don't pull in extra libraries on MSVC
cfg.flag("/Zl");