migrate build system from BSD make (pmake) to GNU make

- Replace BSD make != shell assignment with $(shell ...) idiom
- Replace static $(OBJS): rule + sed hack with %.o: %.c pattern rule
- Use $(MAKE) for all recursive make invocations
- Update CLAUDE.md to document GNU make instead of pmake
- Build verified clean on Fedora (GCC 15, all 14 examples pass)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 50 insertions, 17 deletions

diff --git a/Makefile b/Makefile
index a9b6b31..99875d3 100644
--- a/Makefile
+++ b/Makefile
@@ -1,35 +1,42 @@
-# THIS MAKEFILE ONLY WORKS WITH (NET)BSD MAKE AKA PMAKE!
+# Works with GNU Make on Linux (Fedora and similar).
 
 BIN=fype
-SRCS!=find ./src -name '*.c'
+# Use $(shell ...) for command substitution (GNU make idiom)
+SRCS=$(shell find ./src -name '*.c')
 OBJS=$(SRCS:.c=.o)
 CC?=cc
-#CC=mingw32-gcc
 DEBUG=-g3 -ggdb3
 CFLAGS+=-c -Wall -std=c99 -pedantic $(DEBUG)
 LDADD+=
 HEADER?=docs/header.txt
-OSYSTEM!=uname
+# Detect the OS name for updating build.h
+OSYSTEM=$(shell uname)
 PREFIX=/usr/local
-all: build $(OBJS) newline stats-tofile	
-	@$(CC) -lm -o $(BIN) $(OBJS) $(LDADD) 	
-	@if test -z '$(DEBUG)'; then strip $(BIN) ; fi	
+
+all: build $(OBJS) newline stats-tofile
+	@$(CC) -lm -o $(BIN) $(OBJS) $(LDADD)
+	@if test -z '$(DEBUG)'; then strip $(BIN); fi
 	@awk '$$2 == "BUILDNR" { printf("===> Fype build number % 13s :% 6s%d\n", \
 		"", "", $$3); exit(0); }' src/build.h
-	@echo "===> Fype binary size			:     `du -hs $(BIN)`"	
+	@echo "===> Fype binary size			:     `du -hs $(BIN)`"
 	@#echo "===> `./$(BIN) -v | sed 's/Build .*//'`"
 	@./fype -v > ./docs/version.txt
 	@./fype -h > ./docs/help.txt
 	@./fype -s > ./docs/synopses.txt
 	@echo
-$(OBJS):
-	$(CC) $(LDADD) $(CFLAGS) `echo $@ | sed 's/\.o/\.c/'` -o $@
+
+# Compile each .c to its .o using a GNU make pattern rule; $< is the source file
+%.o: %.c
+	$(CC) $(CFLAGS) $< -o $@
+
 clean:
 	find ./ -name 1 -exec rm -f {} \;
 	find ./ -name '*.o' -exec rm -f {} \;
 	find ./ -name '*.bin' -exec rm -f {} \;
 	find . -name '*.core' -exec rm -f {} \;
 	if [ -f $(BIN) ]; then rm -f $(BIN); fi
+
+# Increment BUILDNR and update the OS_ define in build.h before compiling
 build: ctags
 	@awk '{ \
 		if ($$2 == "BUILDNR") print $$1,$$2,$$3+1; \
@@ -37,22 +44,29 @@ build: ctags
 			toupper("$(OSYSTEM)")); \
 		else print }' \
 			src/build.h  >.tmp && mv -f .tmp src/build.h
+
 printbuild:
 	@awk '$$2 == "BUILDNR" { printf("%d\n", \
 		$$3); exit(0); }' src/build.h
+
+# Generate ctags for editor navigation
 ctags:
-	@# Generating Source-Tags for Vim 
 	ctags `find . -name '*.c'`
+
 style: astyle check
 astyle:
 	find ./src -name '*.[ch]' -exec sh -c 'astyle -s3 {}; rm -f {}.orig' \;
+
+# Check for source lines exceeding 80 characters
 check:
 	for f in `find ./src -name '*.[ch]'`; do awk -v f=$$f \
 		'{ if (length($$0) > 80) { \
 		printf "Max line length reached @ %s:%d => %d\n", \
 		f, NR, length($$0) } }' $$f; done
+
 touch:
 	find ./src -name '*.c' -exec touch {} \;
+
 stats:
 	@sh -c 'wc=`find ./src -name "*.[ch]" | xargs wc -l`; \
 		echo "===> Num of C source files		: `echo \"$$wc\" | \
@@ -64,22 +78,31 @@ stats:
 		grep -E \"\\.fy$$\" | wc -l`"; \
 		echo "===> Num of Fype source lines		: `echo \"$$wc\" | \
 		tail -n 1 | sed s/total//`"'
+
+# Use $(MAKE) for recursive invocations so the correct make binary is always used
 stats-tofile:
-	make stats | tee ./docs/stats.txt
+	$(MAKE) stats | tee ./docs/stats.txt
+
 testrun:
 	cat ./test.fy > ./test.out
 	./$(BIN) -V ./test.fy | tee -a ./test.out
+
 tr: testrun
 test: all testrun
 t: test
+
 run:
 	./$(BIN) ./test.fy
+
 core:
 	gdb $(BIN) $(BIN).core
+
 gdb:
 	gdb --args $(BIN) .//test.fy
+
 newline:
-	@echo 
+	@echo
+
 examples: all
 	echo > ./examples/all-examples.txt
 	for i in ./examples/*.fy; do \
@@ -88,28 +111,38 @@ examples: all
 		cat $$i >> ./examples/all-examples.txt; \
 		echo >> ./examples/all-examples.txt; \
 	done
+
 replace:
 	find ./src -name '*.[ch]' -exec sh -c 'sed -n "s/$(FROM)/$(INTO)/g; \
 		w .tmp" {} && mv -f .tmp {}' \;
+
 headers:
 	@find ./src -name '*.[ch]' -exec sh -c 'export FILE={}; \
-		make header' \;
+		$(MAKE) header' \;
+
 header:
 	@echo "===> Processing $(FILE)"
-	@sed -n '/*:/d; w .tmp' $(FILE) 
+	@sed -n '/*:/d; w .tmp' $(FILE)
 	@header=`sed 's/\(.*\)/ echo " \*: \1"/' $(HEADER)`; \
 		echo '/*:*' > $(FILE); eval "$$header" >> $(FILE); \
 		echo ' *:*/' >> $(FILE); cat .tmp >> $(FILE); rm -f .tmp
+
+# Create a release tarball; use $(MAKE) to call printbuild correctly
 tar: clean
-	sh -c 'build=`make printbuild`;cd ../;\
+	sh -c 'build=`$(MAKE) -s printbuild`;cd ../;\
 		tar cvjf $(BIN)-$$build.tar.bz2 $(BIN)'
+
 install: all
 	cp ./$(BIN) $(PREFIX)/bin
 	cp ./docs/pod/fype.1.gz $(PREFIX)/man/man1
+
 deinstall:
 	rm $(PREFIX)/bin/$(BIN)
 	rm $(PREFIX)/man/man1/fype.1.gz
+
 uninstall: deinstall
+
+# Build man page from POD source
 pod:
-	@cd ./docs/pod; make clean all
+	@cd ./docs/pod; $(MAKE) clean all
 	@cp ./docs/pod/fype.pod README.pod