fix: add Windows .exe compat to E2E tests 02, 35, 36; remove from WINDOWS_SKIP

Tests 02_new_build_run, 35_workspace, and 36_llvm_toolchain were skipped
on Windows solely because they searched for binaries without the .exe
suffix. Fix each by detecting MINGW/MSYS at runtime and searching for
the .exe variant instead.

Additional changes in 36_llvm_toolchain:
- Detect LLVM root via USERPROFILE on Windows (HOME is not set)
- Use clang++.exe for the availability check
- Emit [toolchain] windows = "llvm@20.1.7" on Windows instead of linux

Remove all three tests from WINDOWS_SKIP in run_all.sh so they run in
Windows CI.

Author: Sunrisepeak

tests/e2e/02_new_build_run.sh

@@ -19,7 +19,13 @@ grep -q "std::println"          src/main.cpp || { echo "main.cpp missing 'std::p
 # Build
 "$MCPP" build > build.log 2>&1
 [[ -d target ]] || { cat build.log; echo "no target/ dir"; exit 1; }
-binary="$(find target -name hello -type f | head -1)"
+# On Windows (MINGW/MSYS) the binary has a .exe suffix
+OS="$(uname -s)"
+if [[ "$OS" == MINGW* || "$OS" == MSYS* || "$OS" == CYGWIN* ]]; then
+    binary="$(find target -name hello.exe -type f | head -1)"
+else
+    binary="$(find target -name hello -type f | head -1)"
+fi
 [[ -n "$binary" ]] || { echo "binary not produced"; exit 1; }
 [[ -x "$binary" ]] || { echo "binary not executable"; exit 1; }
 

tests/e2e/35_workspace.sh

@@ -94,7 +94,13 @@ echo "workspace build: ok"
 
 # ── Verify the binary runs correctly ────────────────────
 # target/ is created in the member dir (apps/hello/target/), not workspace root.
-BIN=$(find apps/hello/target -type f -name hello | head -1)
+# On Windows (MINGW/MSYS) the binary has a .exe suffix
+OS="$(uname -s)"
+if [[ "$OS" == MINGW* || "$OS" == MSYS* || "$OS" == CYGWIN* ]]; then
+    BIN=$(find apps/hello/target -type f -name hello.exe | head -1)
+else
+    BIN=$(find apps/hello/target -type f -name hello | head -1)
+fi
 test -n "$BIN" || { echo "FAIL: hello binary not found"; exit 1; }
 OUT=$("$BIN" 2>&1)
 echo "output: $OUT"

tests/e2e/36_llvm_toolchain.sh

@@ -2,8 +2,16 @@
 # 36_llvm_toolchain.sh — build a non-module C/C++ package with xlings LLVM.
 set -e
 
-LLVM_ROOT="${HOME}/.mcpp/registry/data/xpkgs/xim-x-llvm/20.1.7"
-if [[ ! -x "$LLVM_ROOT/bin/clang++" ]]; then
+OS="$(uname -s)"
+# On Windows the clang++ binary has a .exe suffix
+if [[ "$OS" == MINGW* || "$OS" == MSYS* || "$OS" == CYGWIN* ]]; then
+    LLVM_ROOT="${USERPROFILE}/.mcpp/registry/data/xpkgs/xim-x-llvm/20.1.7"
+    CLANGPP_BIN="$LLVM_ROOT/bin/clang++.exe"
+else
+    LLVM_ROOT="${HOME}/.mcpp/registry/data/xpkgs/xim-x-llvm/20.1.7"
+    CLANGPP_BIN="$LLVM_ROOT/bin/clang++"
+fi
+if [[ ! -x "$CLANGPP_BIN" ]]; then
     echo "SKIP: xlings llvm@20.1.7 is not installed"
     exit 0
 fi
@@ -16,7 +24,13 @@ source "$(dirname "$0")/_inherit_toolchain.sh"
 mkdir -p "$TMP/proj/src"
 cd "$TMP/proj"
 
-cat > mcpp.toml <<'EOF'
+if [[ "$OS" == MINGW* || "$OS" == MSYS* || "$OS" == CYGWIN* ]]; then
+    TC_KEY="windows"
+else
+    TC_KEY="linux"
+fi
+
+cat > mcpp.toml <<EOF
 [package]
 name    = "hello_llvm"
 version = "0.1.0"
@@ -25,7 +39,7 @@ version = "0.1.0"
 import_std = false
 
 [toolchain]
-linux = "llvm@20.1.7"
+${TC_KEY} = "llvm@20.1.7"
 EOF
 
 cat > src/main.cpp <<'EOF'
@@ -63,7 +77,11 @@ grep -q 'Finished' "$TMP/build.log" || {
     exit 1
 }
 
-binary=$(find target -type f -path '*/bin/hello_llvm' | head -1)
+if [[ "$OS" == MINGW* || "$OS" == MSYS* || "$OS" == CYGWIN* ]]; then
+    binary=$(find target -type f -path '*/bin/hello_llvm.exe' | head -1)
+else
+    binary=$(find target -type f -path '*/bin/hello_llvm' | head -1)
+fi
 [[ -n "$binary" && -x "$binary" ]] || {
     find target -maxdepth 5 -type f
     echo "FAIL: hello_llvm binary missing"

tests/e2e/run_all.sh

@@ -64,8 +64,6 @@ MACOS_SKIP=(
 # additional Windows-specific exclusions.
 WINDOWS_SKIP=(
     "${MACOS_SKIP[@]}"
-    # new/build/run checks for binary without .exe suffix
-    02_new_build_run.sh
     # Symlinks (ln -sf) not available in Git Bash without elevated perms
     10_env_command.sh
     # test_failing expects non-zero exit but mcpp test returns 0 on Windows
@@ -86,10 +84,6 @@ WINDOWS_SKIP=(
     31_pack_publish_dry_run.sh
     # Semver merge uses path dependencies
     32_semver_merge.sh
-    # Workspace test checks for binary without .exe suffix
-    35_workspace.sh
-    # LLVM toolchain test checks for binary without .exe suffix
-    36_llvm_toolchain.sh
     # LLVM tests that need libc++ std.cppm (not available on Windows)
     37_llvm_import_std.sh
     38_llvm_std_compat.sh