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Add/update comments about MinGW late_link_args #73241

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Jun 13, 2020
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Add/update comments about MinGW late_link_args #73241

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7 changes: 4 additions & 3 deletions src/librustc_target/spec/windows_gnu_base.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,8 @@ pub fn opts() -> TargetOptions {
let mut late_link_args = LinkArgs::new();
let mut late_link_args_dynamic = LinkArgs::new();
let mut late_link_args_static = LinkArgs::new();
// Order of `late_link_args*` was found through trial and error to work with various
// mingw-w64 versions (not tested on the CI). It's expected to change from time to time.
late_link_args.insert(
LinkerFlavor::Gcc,
vec![
Expand All @@ -27,10 +29,9 @@ pub fn opts() -> TargetOptions {
// And it seems that the linker fails to use import symbols from msvcrt
// that are required from functions in msvcrt in certain cases. For example
// `_fmode` that is used by an implementation of `__p__fmode` in x86_64.
// Listing the library twice seems to fix that, and seems to also be done
// by mingw's gcc (Though not sure if it's done on purpose, or by mistake).
// The library is purposely listed twice to fix that.
//
// See https://github.com/rust-lang/rust/pull/47483
// See https://github.com/rust-lang/rust/pull/47483 for some more details.
"-lmsvcrt".to_string(),
"-luser32".to_string(),
"-lkernel32".to_string(),
Expand Down