Use an extensionless x script for non-Windows

src/bootstrap/mk/Makefile.in

@@ -80,7 +80,7 @@ TESTS_IN_MINGW_2 := \
 	src/test/ui
 
 ci-mingw-subset-1:
-	$(Q)$(CFG_SRC_DIR)/x.sh test --stage 2 $(TESTS_IN_MINGW_2:%=--exclude %)
+	$(Q)$(CFG_SRC_DIR)/x test --stage 2 $(TESTS_IN_MINGW_2:%=--exclude %)
 ci-mingw-subset-2:
 	$(Q)$(BOOTSTRAP) test --stage 2 $(TESTS_IN_MINGW_2)
 

src/ci/docker/host-x86_64/x86_64-gnu-llvm-12/Dockerfile

@@ -44,15 +44,15 @@ ENV RUST_CONFIGURE_ARGS \
       --enable-llvm-link-shared \
       --set rust.thin-lto-import-instr-limit=10
 
-# NOTE: intentionally uses all of `x.py`, `x.sh`, and `x.ps1` to make sure they all work on Linux.
+# NOTE: intentionally uses all of `x.py`, `x`, and `x.ps1` to make sure they all work on Linux.
 ENV SCRIPT ../x.py --stage 2 test --exclude src/tools/tidy && \
            # Run the `mir-opt` tests again but this time for a 32-bit target.
            # This enforces that tests using `// EMIT_MIR_FOR_EACH_BIT_WIDTH` have
            # both 32-bit and 64-bit outputs updated by the PR author, before
            # the PR is approved and tested for merging.
            # It will also detect tests lacking `// EMIT_MIR_FOR_EACH_BIT_WIDTH`,
            # despite having different output on 32-bit vs 64-bit targets.
-           ../x.sh --stage 2 test src/test/mir-opt \
+           ../x --stage 2 test src/test/mir-opt \
                              --host='' --target=i686-unknown-linux-gnu && \
            # Run the UI test suite again, but in `--pass=check` mode
            #

src/tools/tidy/src/bins.rs

@@ -98,7 +98,7 @@ mod os_impl {
     pub fn check(path: &Path, bad: &mut bool) {
         use std::ffi::OsStr;
 
-        const ALLOWED: &[&str] = &["configure"];
+        const ALLOWED: &[&str] = &["configure", "x"];
 
         crate::walk_no_read(
             path,

x.ps1

@@ -1,6 +1,6 @@
 #!/usr/bin/env pwsh
 
-# See x.sh for why these scripts exist.
+# See ./x for why these scripts exist.
 
 $xpy = Join-Path $PSScriptRoot x.py
 # Start-Process for some reason splits arguments on spaces. (Isn't powershell supposed to be simpler than bash?)

x.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 # Some systems don't have `python3` in their PATH. This isn't supported by x.py directly;
-# they should use `x.sh` or `x.ps1` instead.
+# they should use `x` or `x.ps1` instead.
 
 # This file is only a "symlink" to bootstrap.py, all logic should go there.