review: only use `llvm_version_major.sh`

Since the `Makefile` can get by with only knowing Clang's major version,
this change removes `llvm_version.sh` and sets `CLANG_VERSION` to use
only the major part.

Makefile

@@ -37,8 +37,8 @@ BASH=
 
 endif
 
-CLANG_VERSION=$(shell $(BASH) ./llvm_version.sh $(LLVM_PROJ_DIR))
-CLANG_MAJOR_VERSION=$(shell $(BASH) ./llvm_version_major.sh $(LLVM_PROJ_DIR))
+# Only the major version is needed for Clang, see https://reviews.llvm.org/D125860.
+CLANG_VERSION=$(shell $(BASH) ./llvm_version_major.sh $(LLVM_PROJ_DIR))
 VERSION:=$(shell $(BASH) ./version.sh)
 DEBUG_PREFIX_MAP=-fdebug-prefix-map=$(ROOT_DIR)=wasisdk://v$(VERSION)
 
@@ -68,8 +68,8 @@ build/llvm.BUILT:
 		-DLLVM_TARGETS_TO_BUILD=WebAssembly \
 		-DLLVM_DEFAULT_TARGET_TRIPLE=wasm32-wasi \
 		-DLLVM_ENABLE_PROJECTS="lld;clang;clang-tools-extra" \
-		$(if $(patsubst 9.%,,$(CLANG_VERSION)), \
-	             $(if $(patsubst 10.%,,$(CLANG_VERSION)), \
+		$(if $(patsubst 9,,$(CLANG_VERSION)), \
+	             $(if $(patsubst 10,,$(CLANG_VERSION)), \
 		          -DDEFAULT_SYSROOT=../share/wasi-sysroot, \
 			  -DDEFAULT_SYSROOT=$(PREFIX)/share/wasi-sysroot), \
 		     -DDEFAULT_SYSROOT=$(PREFIX)/share/wasi-sysroot) \
@@ -135,7 +135,7 @@ build/compiler-rt.BUILT: build/llvm.BUILT build/wasi-libc.BUILT
 		-DCMAKE_C_FLAGS="$(DEBUG_PREFIX_MAP)" \
 		-DLLVM_CONFIG_PATH=$(ROOT_DIR)/build/llvm/bin/llvm-config \
 		-DCOMPILER_RT_OS_DIR=wasi \
-		-DCMAKE_INSTALL_PREFIX=$(PREFIX)/lib/clang/$(CLANG_MAJOR_VERSION)/ \
+		-DCMAKE_INSTALL_PREFIX=$(PREFIX)/lib/clang/$(CLANG_VERSION)/ \
 		-DCMAKE_VERBOSE_MAKEFILE:BOOL=ON \
 		$(LLVM_PROJ_DIR)/compiler-rt/lib/builtins
 	DESTDIR=$(DESTDIR) ninja $(NINJA_FLAGS) -C build/compiler-rt install

llvm_version.sh

@@ -1,6 +0,0 @@
-#/bin/bash
-LLVM_PROJ_DIR=${1:-./src/llvm-project}
-MAJOR=`grep "set(LLVM_VERSION_MAJOR" $LLVM_PROJ_DIR/llvm/CMakeLists.txt | awk '{print substr($2, 1, length($2) - 1)}'`
-MINOR=`grep "set(LLVM_VERSION_MINOR" $LLVM_PROJ_DIR/llvm/CMakeLists.txt | awk '{print substr($2, 1, length($2) - 1)}'`
-PATCH=`grep "set(LLVM_VERSION_PATCH" $LLVM_PROJ_DIR/llvm/CMakeLists.txt | awk '{print substr($2, 1, length($2) - 1)}'`
-echo $MAJOR.$MINOR.$PATCH