diff options
| -rw-r--r-- | src/librustc_back/target/cloudabi_base.rs | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/librustc_back/target/cloudabi_base.rs b/src/librustc_back/target/cloudabi_base.rs index 3353e7936f0..4cd52ebb26d 100644 --- a/src/librustc_back/target/cloudabi_base.rs +++ b/src/librustc_back/target/cloudabi_base.rs @@ -27,6 +27,18 @@ pub fn opts() -> TargetOptions { linker_is_gnu: true, pre_link_args: args, position_independent_executables: true, + // As CloudABI only supports static linkage, there is no need + // for dynamic TLS. The C library therefore does not provide + // __tls_get_addr(), which is normally used to perform dynamic + // TLS lookups by programs that make use of dlopen(). Only the + // "local-exec" and "initial-exec" TLS models can be used. + // + // "local-exec" is more efficient than "initial-exec", as the + // latter has one more level of indirection: it accesses the GOT + // (Global Offset Table) to obtain the effective address of a + // thread-local variable. Using a GOT is useful only when doing + // dynamic linking. + tls_model: "local-exec".to_string(), relro_level: RelroLevel::Full, exe_allocation_crate: super::maybe_jemalloc(), .. Default::default() |