remove allows_weak_linkage target spec flag

compiler/rustc_target/src/spec/base/cygwin.rs

@@ -36,7 +36,6 @@ pub(crate) fn opts() -> TargetOptions {
         families: cvs!["unix"],
         is_like_windows: true,
         binary_format: BinaryFormat::Coff,
-        allows_weak_linkage: false,
         pre_link_args,
         late_link_args,
         abi_return_struct_as_int: true,

compiler/rustc_target/src/spec/base/uefi_msvc.rs

@@ -39,7 +39,6 @@ pub(crate) fn opts() -> TargetOptions {
         linker_flavor: LinkerFlavor::Msvc(Lld::Yes),
         disable_redzone: true,
         exe_suffix: ".efi".into(),
-        allows_weak_linkage: false,
         panic_strategy: PanicStrategy::Abort,
         // LLVM does not emit inline assembly because the LLVM target does not get considered as…
         // "Windows".

compiler/rustc_target/src/spec/base/windows_gnu.rs

@@ -91,7 +91,6 @@ pub(crate) fn opts() -> TargetOptions {
         families: cvs!["windows"],
         is_like_windows: true,
         binary_format: BinaryFormat::Coff,
-        allows_weak_linkage: false,
         pre_link_args,
         pre_link_objects_self_contained: crt_objects::pre_mingw_self_contained(),
         link_self_contained: LinkSelfContainedDefault::InferredForMingw,

compiler/rustc_target/src/spec/base/windows_gnullvm.rs

@@ -36,7 +36,6 @@ pub(crate) fn opts() -> TargetOptions {
         families: cvs!["windows"],
         is_like_windows: true,
         binary_format: BinaryFormat::Coff,
-        allows_weak_linkage: false,
         pre_link_args,
         pre_link_objects_self_contained: pre_mingw_self_contained(),
         link_self_contained: LinkSelfContainedDefault::InferredForMingw,

compiler/rustc_target/src/spec/json.rs

@@ -153,7 +153,6 @@ impl Target {
         forward!(is_like_vexos);
         forward!(binary_format);
         forward!(default_dwarf_version);
-        forward!(allows_weak_linkage);
         forward!(has_rpath);
         forward!(no_default_libraries);
         forward!(position_independent_executables);
@@ -352,7 +351,6 @@ impl ToJson for Target {
         target_option_val!(is_like_vexos);
         target_option_val!(binary_format);
         target_option_val!(default_dwarf_version);
-        target_option_val!(allows_weak_linkage);
         target_option_val!(has_rpath);
         target_option_val!(no_default_libraries);
         target_option_val!(position_independent_executables);
@@ -575,7 +573,6 @@ struct TargetSpecJson {
     is_like_vexos: Option<bool>,
     binary_format: Option<BinaryFormat>,
     default_dwarf_version: Option<u32>,
-    allows_weak_linkage: Option<bool>,
     has_rpath: Option<bool>,
     no_default_libraries: Option<bool>,
     position_independent_executables: Option<bool>,

compiler/rustc_target/src/spec/mod.rs

@@ -2485,13 +2485,6 @@ pub struct TargetOptions {
     /// Default supported version of DWARF on this platform.
     /// Useful because some platforms (osx, bsd) only want up to DWARF2.
     pub default_dwarf_version: u32,
-    /// The MinGW toolchain has a known issue that prevents it from correctly
-    /// handling COFF object files with more than 2<sup>15</sup> sections. Since each weak
-    /// symbol needs its own COMDAT section, weak linkage implies a large
-    /// number sections that easily exceeds the given limit for larger
-    /// codebases. Consequently we want a way to disallow weak linkage on some
-    /// platforms.
-    pub allows_weak_linkage: bool,
     /// Whether the linker support rpaths or not. Defaults to false.
     pub has_rpath: bool,
     /// Whether to disable linking to the default libraries, typically corresponds
@@ -2878,7 +2871,6 @@ impl Default for TargetOptions {
             is_like_vexos: false,
             binary_format: BinaryFormat::Elf,
             default_dwarf_version: 4,
-            allows_weak_linkage: true,
             has_rpath: false,
             no_default_libraries: true,
             position_independent_executables: false,