CI: find clang-c/Index.h and libclang where Ubuntu and Homebrew keep them; the language server on Windows paths

CI has failed since the embed merge (2026-10-25):
- Linux: bootstrap/build.sh asks llvm-config for the folder with clang-c/Index.h
- macOS: FINCH_LIBCLANG's -L folders also go to the compiler's own link "clang"
- Windows: the language server turns file:///C:/x into C:/x and back (diagnostics went to /C:/x);
  the -g tests compare without \r; shared.sh (dlopen, -rdynamic) is not run there

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016GzNP6r8dg6WDxUVZy8wjL

bootstrap/build.sh

@@ -27,8 +27,20 @@ case $seed in windows-*) EXE=.exe ;; esac
 CLANG=${FINCH_CLANG:-clang}
 LIBS=${FINCH_LIBCLANG:--lclang}
 INC=
-[ -z "${FINCH_LLVM_INCLUDE:-}" ] || INC="-I $FINCH_LLVM_INCLUDE"        # where clang-c/Index.h is, if clang does not find it itself
+# where clang-c/Index.h is, if clang does not find it itself (Debian and Ubuntu keep it in /usr/lib/llvm-N/include)
+if [ -z "${FINCH_LLVM_INCLUDE:-}" ] && command -v llvm-config > /dev/null 2>&1 \
+   && [ -f "$(llvm-config --includedir)/clang-c/Index.h" ]; then
+    FINCH_LLVM_INCLUDE=$(llvm-config --includedir)
+fi
+[ -z "${FINCH_LLVM_INCLUDE:-}" ] || INC="-I $FINCH_LLVM_INCLUDE"
 export FINCH_RT=$PWD/runtime/finch_rt.c
+# the -L folders of FINCH_LIBCLANG are where the compiler's own link "clang" is found too
+if [ -z "${FINCH_LDFLAGS:-}" ]; then
+    for w in $LIBS; do
+        case $w in -L*) FINCH_LDFLAGS="${FINCH_LDFLAGS:-} $w" ;; esac
+    done
+    [ -z "${FINCH_LDFLAGS:-}" ] || export FINCH_LDFLAGS
+fi
 # Windows: libclang.dll has to sit next to the programs that use it (FINCH_LIBCLANG is then the path of that dll)
 if [ -n "$EXE" ]; then cp "$LIBS" build/; fi
 

src/lsp.fch

@@ -126,13 +126,22 @@ fn uriToPath(str uri) -> str {
             i += 1
         }
     }
-    return str(out)
+    p := str(out)
+    if p.len > 2 && p[0] == '/' && p[2] == ':' {
+        p = p.sub(1, p.len)         // Windows: file:///C:/x -> C:/x
+    }
+    return p
 }
 
 fn pathToUri(str path) -> str {
     digits := "0123456789ABCDEF"
     []str parts = ["file://"]
-    for c in path {
+    p := path.replace("\\", "/")
+    if p.len > 1 && p[1] == ':' {
+        parts.push("/" + p.sub(0, 2))   // Windows: C:/x -> file:///C:/x
+        p = p.sub(2, p.len)
+    }
+    for c in p {
         n := int(c)
         if (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || "/-_.~".contains(str(c)) {
             parts.push(str(c))

tests/lsp_test.py

@@ -84,7 +84,8 @@ init = c.request("initialize", {"processId": None, "rootUri": None, "capabilitie
 check("initialize", init["capabilities"]["hoverProvider"] is True)
 c.notify("initialized", {})
 c.notify("textDocument/didOpen", {"textDocument": {"uri": uri, "languageId": "finch", "version": 1, "text": src}})
-check("no errors in a good file", c.diagnostics(uri) == [])
+first = c.diagnostics(uri)
+check("no errors in a good file", first == [], first)
 
 h = c.request("textDocument/hover", {"textDocument": td, "position": pos(12, "total")})
 check("hover: variable type", h and "int total" in h["contents"]["value"], h)

tests/run.sh

@@ -79,7 +79,7 @@ for f in new/enums.fch new/generics.fch new/std_json.fch run/basics.fch run/meth
          run/defer.fch run/c_structs.fch run/memory.fch; do
     input="${f%.fch}.in"
     [ -f "$input" ] || input=/dev/null
-    if "$FINCH" build "$f" -g -O0 -o "$tmp/progg" > "$tmp/err" 2>&1 && [ "$("$tmp/progg" < "$input" 2>&1)" == "$(cat "${f%.fch}.out")" ]; then
+    if "$FINCH" build "$f" -g -O0 -o "$tmp/progg" > "$tmp/err" 2>&1 && [ "$("$tmp/progg" < "$input" 2>&1 | tr -d '\r')" == "$(tr -d '\r' < "${f%.fch}.out")" ]; then
         pass=$((pass + 1))
     else
         failed=$((failed + 1))
@@ -88,8 +88,12 @@ for f in new/enums.fch new/generics.fch new/std_json.fch run/basics.fch run/meth
     fi
 done
 
-# a library a C program loads (finch build --shared)
+# a library a C program loads (finch build --shared); the test's host uses dlopen and -rdynamic, so not on Windows
-if FINCH="$FINCH" ./shared.sh > "$tmp/shared.out" 2>&1; then
+# (there a DLL can't call functions of the program that loads it without an import library)
+case "$(uname -s)" in MINGW*|MSYS*|CYGWIN*) skip_shared=1 ;; *) skip_shared=0 ;; esac
+if [ $skip_shared = 1 ]; then
+    :
+elif FINCH="$FINCH" ./shared.sh > "$tmp/shared.out" 2>&1; then
     pass=$((pass + 1))
 else
     failed=$((failed + 1))