Rollup merge of #142179 - folkertdev:min-global-align-parse, r=workingjubilee

store `target.min_global_align` as an `Align`

Parse the alignment properly when the target is defined/parsed, and error out on invalid alignment values. That means this work doesn't need to happen for every global in each backend.

messages.ftl

@@ -2,9 +2,6 @@ codegen_gcc_unknown_ctarget_feature_prefix =
     unknown feature specified for `-Ctarget-feature`: `{$feature}`
     .note = features must begin with a `+` to enable or `-` to disable it
 
-codegen_gcc_invalid_minimum_alignment =
-    invalid minimum global alignment: {$err}
-
 codegen_gcc_forbidden_ctarget_feature =
     target feature `{$feature}` cannot be toggled with `-Ctarget-feature`: {$reason}
 

src/consts.rs

@@ -18,7 +18,6 @@ use rustc_span::def_id::DefId;
 
 use crate::base;
 use crate::context::CodegenCx;
-use crate::errors::InvalidMinimumAlignment;
 use crate::type_of::LayoutGccExt;
 
 fn set_global_alignment<'gcc, 'tcx>(
@@ -29,13 +28,8 @@ fn set_global_alignment<'gcc, 'tcx>(
     // The target may require greater alignment for globals than the type does.
     // Note: GCC and Clang also allow `__attribute__((aligned))` on variables,
     // which can force it to be smaller. Rust doesn't support this yet.
-    if let Some(min) = cx.sess().target.min_global_align {
-        match Align::from_bits(min) {
-            Ok(min) => align = align.max(min),
-            Err(err) => {
-                cx.sess().dcx().emit_err(InvalidMinimumAlignment { err: err.to_string() });
-            }
-        }
+    if let Some(min_global) = cx.sess().target.min_global_align {
+        align = Ord::max(align, min_global);
     }
     gv.set_alignment(align.bytes() as i32);
 }

src/errors.rs

@@ -47,12 +47,6 @@ pub(crate) struct UnwindingInlineAsm {
     pub span: Span,
 }
 
-#[derive(Diagnostic)]
-#[diag(codegen_gcc_invalid_minimum_alignment)]
-pub(crate) struct InvalidMinimumAlignment {
-    pub err: String,
-}
-
 #[derive(Diagnostic)]
 #[diag(codegen_gcc_copy_bitcode)]
 pub(crate) struct CopyBitcode {