Auto merge of #115120 - icedrocket:ignore-strip-on-msvc, r=michaelwoerister

Ignore `-C strip` on MSVC

tl;dr - Define `-Cstrip` to only ever affect the binary; no other build artifacts.

This is necessary to improve cross-platform behavior consistency: if someone wanted debug information to be contained only in separate files on all platforms, they would set `-Cstrip=symbols` and `-Csplit-debuginfo=packed`, but this would result in no PDB files on MSVC.

Resolves #114215

tests/ui/debuginfo/msvc-strip-debuginfo.rs

@@ -0,0 +1,26 @@
+//@ compile-flags: -C strip=debuginfo
+//@ only-msvc
+//@ run-pass
+
+use std::path::Path;
+
+pub fn is_related_pdb<P: AsRef<Path>>(path: &P, exe: &P) -> bool {
+    let (exe, path) = (exe.as_ref(), path.as_ref());
+
+    path.extension()
+        .map(|x| x.to_ascii_lowercase())
+        .is_some_and(|x| x == "pdb")
+        && path.file_stem() == exe.file_stem()
+}
+
+pub fn main() {
+    let curr_exe = std::env::current_exe().unwrap();
+    let curr_dir = curr_exe.parent().unwrap();
+
+    let entries = std::fs::read_dir(curr_dir).unwrap();
+
+    assert!(entries
+        .map_while(|x| x.ok())
+        .find(|x| is_related_pdb(&x.path(), &curr_exe))
+        .is_some());
+}

tests/ui/debuginfo/msvc-strip-symbols.rs

@@ -0,0 +1,26 @@
+//@ compile-flags: -C strip=symbols
+//@ only-msvc
+//@ run-pass
+
+use std::path::Path;
+
+pub fn is_related_pdb<P: AsRef<Path>>(path: &P, exe: &P) -> bool {
+    let (exe, path) = (exe.as_ref(), path.as_ref());
+
+    path.extension()
+        .map(|x| x.to_ascii_lowercase())
+        .is_some_and(|x| x == "pdb")
+        && path.file_stem() == exe.file_stem()
+}
+
+pub fn main() {
+    let curr_exe = std::env::current_exe().unwrap();
+    let curr_dir = curr_exe.parent().unwrap();
+
+    let entries = std::fs::read_dir(curr_dir).unwrap();
+
+    assert!(entries
+        .map_while(|x| x.ok())
+        .find(|x| is_related_pdb(&x.path(), &curr_exe))
+        .is_some());
+}