Ensure user defined LLVM_CONFIG is respected

build_odin.sh

@@ -5,7 +5,7 @@ set -eu
 : ${CXX=clang++}
 : ${CXXFLAGS=}
 : ${LDFLAGS=}
-: ${LLVM_CONFIG=llvm-config}
+: ${LLVM_CONFIG=}
 
 CPPFLAGS="$CPPFLAGS -DODIN_VERSION_RAW=\"dev-$(date +"%Y-%m")\""
 CXXFLAGS="$CXXFLAGS -std=c++14"
@@ -14,7 +14,12 @@ LDFLAGS="$LDFLAGS -pthread -lm -lstdc++"
 OS_ARCH="$(uname -m)"
 OS_NAME="$(uname -s)"
 
-if [ -z "$(command -v llvm-config)" ]; then
+error() {
+	printf "ERROR: %s\n" "$1"
+	exit 1
+}
+
+if [ -z "$LLVM_CONFIG" ]; then
 	if [ -n "$(command -v llvm-config-17)" ]; then
 		LLVM_CONFIG="llvm-config-17"
 	elif [ -n "$(command -v llvm-config-14)" ]; then
@@ -25,6 +30,10 @@ if [ -z "$(command -v llvm-config)" ]; then
 		LLVM_CONFIG="llvm-config-12"
 	elif [ -n "$(command -v llvm-config-11)" ]; then
 		LLVM_CONFIG="llvm-config-11"
+	elif [ -n "$(command -v llvm-config)" ]; then
+		LLVM_CONFIG="llvm-config"
+	else
+		error "No supported llvm-config version found. Set LLVM_CONFIG to proceed."
 	fi
 fi
 
@@ -33,11 +42,6 @@ LLVM_VERSION_MAJOR="$(echo $LLVM_VERSION | awk -F. '{print $1}')"
 LLVM_VERSION_MINOR="$(echo $LLVM_VERSION | awk -F. '{print $2}')"
 LLVM_VERSION_PATCH="$(echo $LLVM_VERSION | awk -F. '{print $3}')"
 
-error() {
-	printf "ERROR: %s\n" "$1"
-	exit 1
-}
-
 if [ -d ".git" ] && [ -n "$(command -v git)" ]; then
 	GIT_SHA=($(git show --pretty='%h'--no-patch --no-notes HEAD))
 	CPPFLAGS="$CPPFLAGS -DGIT_SHA=\"$GIT_SHA\""