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rustc_session: default to -Z plt=yes on non-x86_64

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Per the discussion in #106380 plt=no isn't a great default, and
rust-lang/compiler-team#581 decided that the default should be PLT=yes
for everything except x86_64. Not everyone agrees about the x86_64 part
of this change, but this at least is an improvement in the state of
things without changing the x86_64 situation, so I've attempted making
this change in the name of not letting the perfect be the enemy of the
good.
This commit is contained in:
Augie Fackler 2023-04-05 15:02:57 -04:00
parent 2efe091705
commit dfc5218dc8
2 changed files with 2 additions and 2 deletions
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2
compiler/rustc_session/src/options.rs
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@ -1613,7 +1613,7 @@ pub(crate) fn parse_proc_macro_execution_strategy(
plt: Option<bool> = (None, parse_opt_bool, [TRACKED],
"whether to use the PLT when calling into shared libraries;
only has effect for PIC code on systems with ELF binaries
(default: PLT is disabled if full relro is enabled)"),
(default: PLT is disabled if full relro is enabled on x86_64)"),
polonius: bool = (false, parse_bool, [TRACKED],
"enable polonius-based borrow-checker (default: no)"),
polymorphize: bool = (false, parse_bool, [TRACKED],

2
compiler/rustc_session/src/session.rs
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@ -1013,7 +1013,7 @@ pub fn rust_2024(&self) -> bool {
pub fn needs_plt(&self) -> bool {
// Check if the current target usually needs PLT to be enabled.
// The user can use the command line flag to override it.
let needs_plt = self.target.needs_plt;
let needs_plt = self.target.arch != "x86_64";
let dbg_opts = &self.opts.unstable_opts;