fix build system (pt 2; electric boogaloo) (#13)

Author: fmbearmf

Makefile

@@ -3,6 +3,9 @@
 # Works on Linux, macOS, and Windows
 # ============================================================
 
+# Define target executable (must be defined before config.mk is included)
+BIN       := luma
+
 # Include default config
 include config.default.mk
 
@@ -15,8 +18,6 @@ endif
 # Paths & Files
 # ------------------------------------------------------------
 
-BIN       := luma
-
 # Detect OS and set appropriate commands
 ifeq ($(OS),Windows_NT)
     # Windows commands
@@ -152,4 +153,4 @@ help:
 	@echo   run-llvm        - Run generated bitcode with lli
 	@echo   compile-native  - Compile LLVM IR to native executable
 	@echo   clean           - Remove all build artifacts
-	@echo   help            - Show this help
+	@echo   help            - Show this help

config.mk.in

@@ -1,4 +1,4 @@
-CC = @CXX@
+CC = @CC@
 CFLAGS += @CXXFLAGS@
 LDFLAGS += @LDFLAGS@
 PREFIX = @prefix@

configure.ac

@@ -3,9 +3,9 @@ AC_PREREQ([2.69])
 AC_CONFIG_SRCDIR([src/main.c]) # sanity check to make sure someone didn't pass a garbage --srcdir
 #AM_INIT_AUTOMAKE([foreign 1.16 dist-bzip2])
 
-AC_PROG_CXX
-AC_LANG(C++)
-AC_SUBST(CXX)
+AC_PROG_CC
+AC_LANG(C)
+AC_SUBST(CC)
 # connor, i have no idea why you're expecting CC to be a C++ compiler.
 # that's what CXX is for.