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std: Add an option to disable ELF based TLS

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This commit adds a ./configure option called `--disable-elf-tls` which disables
ELF based TLS (that which is communicated to LLVM) on platforms which already
support it. OSX 10.6 does not support this form of TLS, and some users of Rust
need to target 10.6 and are unable to do so due to the usage of TLS. The
standard library will continue to use ELF based TLS on OSX by default (as the
officially supported platform is 10.7+), but this adds an option to compile the
standard library in a way that is compatible with 10.6.
This commit is contained in:
Alex Crichton 2015-05-27 23:24:27 -07:00
parent efcc1d1bcb
commit 1b5f9cb1f1
4 changed files with 80 additions and 27 deletions
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@ -593,6 +593,7 @@ valopt musl-root "/usr/local" "MUSL root installation directory"
opt_nosave manage-submodules 1 "let the build manage the git submodules"
opt_nosave clang 0 "prefer clang to gcc for building the runtime"
opt_nosave jemalloc 1 "build liballoc with jemalloc"
opt elf-tls 1 "elf thread local storage on platforms where supported"
valopt_nosave prefix "/usr/local" "set installation prefix"
valopt_nosave local-rust-root "/usr/local" "set prefix for local rust binary"