startHEADmaster

1 files changed, 49 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..e0a55cd
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,49 @@
+CC = musl-gcc
+DBGCFLAGS = -Wall -ansi -Wpedantic -static -g
+RELCFLAGS = -Wall -ansi -Wpedantic -static -O2
+# Wildcard expansion does not happen in variable definitions, this fails:
+#SRCS = *.c
+# But can be forced:
+SRCS = $(filter-out main.c,$(wildcard *.c))
+OUT_DIR = /tmp/build
+TMP_OBJS = $(SRCS:.c=.o)
+OBJS = $(addprefix $(OUT_DIR)/,$(TMP_OBJS))
+# llist_double_ptr.o: target name (not file name)
+# $< name of the first prerequisite = llist_double_ptr.c
+# $@ current target name, reused as filename in CC invocation
+#llist_double_ptr.o: llist_double_ptr.c llist_double_ptr.h
+	#$(CC) $(CFLAGS) -c $< -o $@
+# $^ space-separated names of all prerequisites
+# default goal because defined first
+debug: main.c $(OBJS) | $(OUT_DIR)/deps.mk
+	$(CC) $(DBGCFLAGS) $^ -o $(OUT_DIR)/$@
+# Order-only dependency - create OUT_DIR before building
+$(OBJS): | $(OUT_DIR)
+# generalized target to build obj files for all .c + .h pairs
+# OBJS var fails here
+#mkdir $(OUT_DIR) > /dev/null 2>&1
+$(OUT_DIR)/%.o: %.c %.h
+	$(CC) $(DBGCFLAGS) -c $< -o $@
+#include file into this Makefile, '-' = don't error if doesn't exit
+ifneq (clean, $(MAKECMDGOALS))
+  -include $(OUT_DIR)/deps.mk
+endif
+#generate list of .h dependencies for all .c files in SRCS
+#-MM is gcc facility specifically for GNU Make
+#this generates:
+#$ gcc -MM functions_ptrs.c llist_double_ptr.c
+#functions_ptrs.o: functions_ptrs.c functions_ptrs.h
+#llist_double_ptr.o: llist_double_ptr.c llist_double_ptr.h
+# ^ 2 targets that don't do anything, only define dependencies
+$(OUT_DIR)/deps.mk: $(SRCS) | $(OUT_DIR)
+	$(CC) -MM $^ > $@
+#[ -f $(OUT_DIR)/deps.mk ] || $(CC) -MM $^ > $@
+$(OUT_DIR):
+	mkdir $(OUT_DIR)
+indent:
+	indent --linux-style *.c *.h
+	rm *~
+#Tell Make that "clean" is not a filename
+.PHONY : clean
+clean:
+	-rm -rv $(OUT_DIR)