static inline C functions (mingw's printf and time), macOS libraries that call their host, lld's missing-library message

- a static inline function in a header is called through a pointer a small C file keeps
  (void *finch_inl_f = &f), built with the program's include folders and cached
- --shared on macOS links with -undefined dynamic_lookup, as a .so does on Linux
- "unable to find library -lx" (lld, MinGW) gives the library-not-found advice
- the language server test shows the index records when alias completion fails

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

tests/lsp_test.py

@@ -204,7 +204,12 @@ e3 = src3.replace("    print(", "    pt.\n    print(")
 c.notify("textDocument/didChange", {"textDocument": {"uri": uri3, "version": 2}, "contentChanges": [{"text": e3}]})
 comp = c.request("textDocument/completion", {"textDocument": {"uri": uri3}, "position": {"line": 3, "character": 7}})
 labels = [i["label"] for i in comp["items"]]
-check("completion: a module under another name", "base" in labels and "join" in labels, labels)
+ok3 = "base" in labels and "join" in labels
+if not ok3:  # show what the compiler's index says about the module, to see where the names differ
+    import subprocess
+    idx = subprocess.run([FINCH, "index", path3], capture_output=True, text=True).stdout
+    labels = [l for l in idx.splitlines() if l.startswith("@I") or (l.startswith("@F") and "base" in l)][:6]
+check("completion: a module under another name", ok3, labels)
 
 c.request("shutdown", None)
 c.notify("exit", None)

tests/new/c_unions_macros.fch

@@ -26,4 +26,5 @@ fn main() {
     print(abs(-2.5), abs(-3), min(EV_KEY, 7))     // Finch's abs, not C's int-only one
     bg := RAYWHITE                                  // #define RAYWHITE (Color){ 245, 245, 245, 255 }
     print(bg.r, bg.a, DARK.g, DARK.a, HALF_UP.x, HALF_UP.y)
+    print(twice(21))                                // static inline in the header
 }

tests/new/c_unions_macros.out

@@ -6,3 +6,4 @@ true 32
 0.5
 2.5 3 7
 245 255 20 0 0.5 -1
+42

tests/new/cunion.h

@@ -36,3 +36,6 @@ static inline int fill_key(Event *e, int key) {
     return 1;
 }
 int poll_event(Event *e);
+
+static inline int twice(int x) { return 2 * x; }
+static inline int sum_all(int n, ...) { return n; }