all: use compiler-rt from the llvm-project directory

We don't need the separate submodule: compiler-rt is already included in
the llvm-project repository.

This should hopefully make CI slightly faster too.

.gitmodules

@@ -10,7 +10,3 @@
 [submodule "lib/cmsis-svd"]
 	path = lib/cmsis-svd
 	url = https://github.com/tinygo-org/cmsis-svd
-[submodule "lib/compiler-rt"]
-	path = lib/compiler-rt
-	url = https://github.com/llvm-mirror/compiler-rt.git
-	branch = release_80

Makefile

@@ -258,9 +258,9 @@ release: tinygo gen-device
 	@cp -p $(abspath $(CLANG_SRC))/lib/Headers/*.h build/release/tinygo/lib/clang/include
 	@cp -rp lib/CMSIS/CMSIS/Include                build/release/tinygo/lib/CMSIS/CMSIS
 	@cp -rp lib/CMSIS/README.md                    build/release/tinygo/lib/CMSIS
-	@cp -rp lib/compiler-rt/lib/builtins build/release/tinygo/lib/compiler-rt/lib
+	@cp -rp llvm-project/compiler-rt/lib/builtins  build/release/tinygo/lib/compiler-rt/lib
-	@cp -rp lib/compiler-rt/LICENSE.TXT  build/release/tinygo/lib/compiler-rt
+	@cp -rp llvm-project/compiler-rt/LICENSE.TXT   build/release/tinygo/lib/compiler-rt
-	@cp -rp lib/compiler-rt/README.txt   build/release/tinygo/lib/compiler-rt
+	@cp -rp llvm-project/compiler-rt/README.txt    build/release/tinygo/lib/compiler-rt
 	@cp -rp lib/nrfx/*                             build/release/tinygo/lib/nrfx
 	@cp -rp src                                    build/release/tinygo/src
 	@cp -rp targets                                build/release/tinygo/targets

builder/builtins.go

@@ -166,6 +166,12 @@ func builtinFiles(target string) []string {
 
 // builtinsDir returns the directory where the sources for compiler-rt are kept.
 func builtinsDir() string {
+	// Path from within the development directory.
+	path := filepath.Join(goenv.Get("TINYGOROOT"), "llvm-project", "compiler-rt", "lib", "builtins")
+	if _, err := os.Stat(path); err == nil {
+		return path
+	}
+	// Path from within an installation directory (bundled in the release tarball).
 	return filepath.Join(goenv.Get("TINYGOROOT"), "lib", "compiler-rt", "lib", "builtins")
 }
 

lib/compiler-rt

@@ -1 +0,0 @@
-Subproject commit 5bc79797e1f9184f39e1bd30fac75d995b72cea3