[PATCH] Making CFLAGS compilant with GNU Coding Standards

[Pavel Roskin <proski@gnu.org>]

Hello!

Quoting GNU Coding Standards ("info standards"):

"If there are C compiler options that _must_ be used for proper
compilation of certain files, do not include them in `CFLAGS'.  Users
expect to be able to specify `CFLAGS' freely themselves."

This patch renames COPTS to CFLAGS, because it's COPTS that was user
overridable.  Also, -Wall is moved there because it's optional.  What
was CFLAGS is now ALL_CFLAGS, which users should not override.

Defines are added to DEFINES.  Since ALL_CFLAGS is recursively expanded,
it uses the final value of DEFINES.

Implicit rules are made explicit since the implicit rules use CFLAGS
rather than ALL_CFLAGS.  I believe that serious projects should not rely
on implicit rules anyway.  Percent rules are used because they are used
already and because they don't need the .SUFFIXES target.

Signed-off-by: Pavel Roskin <proski@gnu.org>

diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -34,8 +34,8 @@
 
 GIT_VERSION=0.99.3
 
-COPTS?=-g -O2
-CFLAGS+=$(COPTS) -Wall $(DEFINES)
+CFLAGS ?= -g -O2 -Wall
+ALL_CFLAGS = $(CFLAGS) $(DEFINES)
 
 prefix=$(HOME)
 bindir=$(prefix)/bin
@@ -125,7 +125,7 @@ ifndef NO_OPENSSL
 	LIB_OBJS += epoch.o
 	OPENSSL_LIBSSL=-lssl
 else
-	CFLAGS += '-DNO_OPENSSL'
+	DEFINES += '-DNO_OPENSSL'
 	MOZILLA_SHA1=1
 	OPENSSL_LIBSSL=
 endif
@@ -146,8 +146,8 @@ endif
 endif
 endif
 
-CFLAGS += '-DSHA1_HEADER=$(SHA1_HEADER)'
-CFLAGS += '-DDEFAULT_GIT_TEMPLATE_ENVIRONMENT="$(etcgitdir)/templates"'
+DEFINES += '-DSHA1_HEADER=$(SHA1_HEADER)'
+DEFINES += '-DDEFAULT_GIT_TEMPLATE_ENVIRONMENT="$(etcgitdir)/templates"'
 
 
 
@@ -156,9 +156,15 @@ CFLAGS += '-DDEFAULT_GIT_TEMPLATE_ENVIRO
 all: $(PROG)
 
 
+%.o: %.c
+	$(CC) -c $(ALL_CFLAGS) $<
+
+%.o: %.S
+	$(CC) -c $(ALL_CFLAGS) $<
+
 .PRECIOUS: %.o
 git-%: %.o $(LIB_FILE)
-	$(CC) $(CFLAGS) -o $@ $(filter %.o,$^) $(LIBS)
+	$(CC) $(ALL_CFLAGS) -o $@ $(filter %.o,$^) $(LIBS)
 
 git-http-pull: pull.o
 git-local-pull: pull.o
@@ -185,13 +191,13 @@ test: all
 	$(MAKE) -C t/ all
 
 test-date: test-date.c date.o
-	$(CC) $(CFLAGS) -o $@ test-date.c date.o
+	$(CC) $(ALL_CFLAGS) -o $@ test-date.c date.o
 
 test-delta: test-delta.c diff-delta.o patch-delta.o
-	$(CC) $(CFLAGS) -o $@ $^
+	$(CC) $(ALL_CFLAGS) -o $@ $^
 
 check:
-	for i in *.c; do sparse $(CFLAGS) $(SPARSE_FLAGS) $$i; done
+	for i in *.c; do sparse $(ALL_CFLAGS) $(SPARSE_FLAGS) $$i; done
 
 
 

-- 
Regards,
Pavel Roskin