CMake, Makefile: pass the location of arch_flags to the makefile, this way the…

CMake, Makefile: pass the location of arch_flags to the makefile, this way the cmake build does not write to the soruce directory

CMakeLists.txt

@@ -53,6 +53,7 @@ execute_process(
     make
         ${ABC_READLINE_FLAGS}
         ${ABC_USE_NAMESPACE}
+        ARCHFLAGS_EXE=${CMAKE_CURRENT_BINARY_DIR}/abc_arch_flags_program.exe
         ABC_MAKE_NO_DEPS=1
         CC=${CMAKE_C_COMPILER}
         CXX=${CMAKE_CXX_COMPILER}

Makefile

@@ -34,12 +34,14 @@ MODULES := \
 all: $(PROG)
 default: $(PROG)
 
-arch_flags : arch_flags.c
-	$(CC) arch_flags.c -o arch_flags
+ARCHFLAGS_EXE ?= ./arch_flags
+
+$(ARCHFLAGS_EXE) : arch_flags.c
+	$(CC) arch_flags.c -o $(ARCHFLAGS_EXE)
 
 INCLUDES += -Isrc
 
-ARCHFLAGS ?= $(shell $(CC) arch_flags.c -o arch_flags && ./arch_flags)
+ARCHFLAGS ?= $(shell $(CC) arch_flags.c -o $(ARCHFLAGS_EXE) && $(ARCHFLAGS_EXE))
 ARCHFLAGS := $(ARCHFLAGS)
 
 OPTFLAGS  ?= -g -O