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bors 54508a26eb Auto merge of #78924 - bjorn3:less_sysroot_build_scripts, r=Mark-Simulacrum 
Make the libstd build script smaller

Of all sysroot crates currently only compiler_builtins, miniz_oxide and std require a build script. compiler_builtins uses to conditionally enable certain features and possibly compile a C version ([source](63ccaf11f0/build.rs)), miniz_oxide only uses it to detect if liballoc is supported as the MSRV is 1.34.0 instead of the 1.36.0 which stabilized liballoc ([source](28514ec09f/miniz_oxide/build.rs)). std now only uses it to enable `freebsd12` when the `RUST_STD_FREEBSD_12_ABI` env var is set, to determine if `restricted-std` should be set, to set the `STD_ENV_ARCH` env var identical to `CARGO_CFG_TARGET_ARCH`, and to unconditionally enable `backtrace_in_libstd`.

If all build scripts were to be removed, it would be possible for rustc to completely compile it's own sysroot. It currently requires a rustc version that already has an available libstd to compile the build scripts. If rustc can completely compile it's own sysroot, rustbuild could be simplified to not forcefully use the bootstrap compiler for build scripts.

`@rustbot` modify labels: +T-compiler +libs-impl
2020-11-17 06:37:59 +00:00
..
alloc Rollup merge of #78903 - ssomers:btree_order_chaos_testing, r=Mark-Simulacrum 2020-11-16 17:26:33 +01:00
backtrace@8b8ea53b56 Bump backtrace-rs to enable Mach-O support on iOS. 2020-10-23 13:47:09 +02:00
core Rollup merge of #78769 - est31:remove_lifetimes, r=KodrAus 2020-11-16 17:26:29 +01:00
panic_abort Rollup merge of #76866 - est31:master, r=lcnr 2020-09-20 15:51:50 +02:00
panic_unwind Fix even more URLs 2020-11-05 20:11:29 +01:00
proc_macro Rollup merge of #78465 - est31:proc_macro_to_string, r=jyn514 2020-11-05 10:29:42 +01:00
profiler_builtins Fix warning whe building profiler_builtins crate 2020-09-04 15:10:29 +02:00
rtstartup
rustc-std-workspace-alloc
rustc-std-workspace-core
rustc-std-workspace-std
std Auto merge of #78924 - bjorn3:less_sysroot_build_scripts, r=Mark-Simulacrum 2020-11-17 06:37:59 +00:00
stdarch@3c3664355e Update stdarch submodule 2020-10-01 13:06:22 -04:00
term
test Merge set_panic and set_print into set_output_capture. 2020-11-10 21:58:13 +01:00
unwind allow using the system-wide llvm-libunwind as the unwinder 2020-10-21 14:45:58 +02:00