on MacOS llvm is not installed by default, add a test for that. Before this fix
the make run proceeded, producing meaningless error messages.
diff --git a/llvm_mode/Makefile b/llvm_mode/Makefile
index 8c76936..d5dfe7c 100644
--- a/llvm_mode/Makefile
+++ b/llvm_mode/Makefile
@@ -35,7 +35,7 @@
LLVM_CONFIG ?= llvm-config
endif
-LLVMVER = $(shell $(LLVM_CONFIG) --version 2>/dev/null)
+LLVMVER = $(shell $(LLVM_CONFIG) --version 2>/dev/null )
LLVM_UNSUPPORTED = $(shell $(LLVM_CONFIG) --version 2>/dev/null | egrep -q '^[12]|^3\.0|^1[0-9]' && echo 1 || echo 0 )
LLVM_NEW_API = $(shell $(LLVM_CONFIG) --version 2>/dev/null | egrep -q '^1[0-9]' && echo 1 || echo 0 )
LLVM_MAJOR = $(shell $(LLVM_CONFIG) --version 2>/dev/null | sed 's/\..*//')
@@ -43,8 +43,12 @@
LLVM_STDCXX = gnu++11
LLVM_APPLE = $(shell clang -v 2>&1 | grep -iq apple && echo 1 || echo 0)
+ifeq "$(LLVMVER)" ""
+ $(error llvm_mode needs llvm-config, which was not found)
+endif
+
ifeq "$(LLVM_UNSUPPORTED)" "1"
- $(warn llvm_mode only supports versions 3.8.0 up to 9)
+ $(warn llvm_mode only supports llvm versions 3.8.0 up to 9)
endif
ifeq "$(LLVM_MAJOR)" "9"
