Merge branch 'ab/makefile-help-devs-more'

CFLAGS now can be tweaked when invoking Make while using
DEVELOPER=YesPlease; this did not work well before.

* ab/makefile-help-devs-more:
  Makefile: allow for combining DEVELOPER=1 and CFLAGS="..."
  Makefile: move the setting of *FLAGS closer to "include"
  Makefile: Move *_LIBS assignment into its own section
  Makefile: add/remove comments at top and tweak whitespace
  Makefile: move "strip" assignment down from flags
  Makefile: remove an out-of-date comment

Author: gitster

Makefile

@@ -479,7 +479,11 @@ all::
 #
 # Define DEVELOPER to enable more compiler warnings. Compiler version
 # and family are auto detected, but could be overridden by defining
-# COMPILER_FEATURES (see config.mak.dev)
+# COMPILER_FEATURES (see config.mak.dev). You can still set
+# CFLAGS="..." in combination with DEVELOPER enables, whether that's
+# for tweaking something unrelated (e.g. optimization level), or for
+# selectively overriding something DEVELOPER or one of the DEVOPTS
+# (see just below) brings in.
 #
 # When DEVELOPER is set, DEVOPTS can be used to control compiler
 # options.  This variable contains keywords separated by
@@ -506,17 +510,8 @@ GIT-VERSION-FILE: FORCE
 	@$(SHELL_PATH) ./GIT-VERSION-GEN
 -include GIT-VERSION-FILE
 
-# CFLAGS and LDFLAGS are for the users to override from the command line.
-
-CFLAGS = -g -O2 -Wall
-LDFLAGS =
-ALL_CFLAGS = $(CPPFLAGS) $(CFLAGS)
-ALL_LDFLAGS = $(LDFLAGS)
-STRIP ?= strip
-
-# Create as necessary, replace existing, make ranlib unneeded.
-ARFLAGS = rcs
-
+# Set our default configuration.
+#
 # Among the variables below, these:
 #   gitexecdir
 #   template_dir
@@ -561,6 +556,7 @@ perllibdir_relative = $(patsubst $(prefix)/%,%,$(perllibdir))
 
 export prefix bindir sharedir sysconfdir gitwebdir perllibdir localedir
 
+# Set our default programs
 CC = cc
 AR = ar
 RM = rm -f
@@ -573,29 +569,14 @@ TCLTK_PATH = wish
 XGETTEXT = xgettext
 MSGFMT = msgfmt
 CURL_CONFIG = curl-config
-PTHREAD_LIBS = -lpthread
-PTHREAD_CFLAGS =
 GCOV = gcov
+STRIP = strip
 SPATCH = spatch
 
 export TCL_PATH TCLTK_PATH
 
-# user customisation variable for 'sparse' target
-SPARSE_FLAGS ?=
-# internal/platform customisation variable for 'sparse'
-SP_EXTRA_FLAGS =
-
-SPATCH_FLAGS = --all-includes --patch .
-
-
-
-### --- END CONFIGURATION SECTION ---
-
-# Those must not be GNU-specific; they are shared with perl/ which may
-# be built by a different compiler. (Note that this is an artifact now
-# but it still might be nice to keep that distinction.)
-BASIC_CFLAGS = -I.
-BASIC_LDFLAGS =
+# Set our default LIBS variables
+PTHREAD_LIBS = -lpthread
 
 # Guard against environment variables
 BUILTIN_OBJS =
@@ -1177,6 +1158,25 @@ ifeq ($(wildcard sha1collisiondetection/lib/sha1.h),sha1collisiondetection/lib/s
 DC_SHA1_SUBMODULE = auto
 endif
 
+# Set CFLAGS, LDFLAGS and other *FLAGS variables. These might be
+# tweaked by config.* below as well as the command-line, both of
+# which'll override these defaults.
+CFLAGS = -g -O2 -Wall
+LDFLAGS =
+BASIC_CFLAGS = -I.
+BASIC_LDFLAGS =
+
+# library flags
+ARFLAGS = rcs
+PTHREAD_CFLAGS =
+
+# For the 'sparse' target
+SPARSE_FLAGS ?=
+SP_EXTRA_FLAGS =
+
+# For the 'coccicheck' target
+SPATCH_FLAGS = --all-includes --patch .
+
 include config.mak.uname
 -include config.mak.autogen
 -include config.mak
@@ -1185,6 +1185,9 @@ ifdef DEVELOPER
 include config.mak.dev
 endif
 
+ALL_CFLAGS = $(DEVELOPER_CFLAGS) $(CPPFLAGS) $(CFLAGS)
+ALL_LDFLAGS = $(LDFLAGS)
+
 comma := ,
 empty :=
 space := $(empty) $(empty)

config.mak.dev

@@ -1,48 +1,48 @@
 ifeq ($(filter no-error,$(DEVOPTS)),)
-CFLAGS += -Werror
+DEVELOPER_CFLAGS += -Werror
 endif
 ifneq ($(filter pedantic,$(DEVOPTS)),)
-CFLAGS += -pedantic
+DEVELOPER_CFLAGS += -pedantic
 # don't warn for each N_ use
-CFLAGS += -DUSE_PARENS_AROUND_GETTEXT_N=0
-endif
-CFLAGS += -Wall
-CFLAGS += -Wdeclaration-after-statement
-CFLAGS += -Wformat-security
-CFLAGS += -Wno-format-zero-length
-CFLAGS += -Wold-style-definition
-CFLAGS += -Woverflow
-CFLAGS += -Wpointer-arith
-CFLAGS += -Wstrict-prototypes
-CFLAGS += -Wunused
-CFLAGS += -Wvla
+DEVELOPER_CFLAGS += -DUSE_PARENS_AROUND_GETTEXT_N=0
+endif
+DEVELOPER_CFLAGS += -Wall
+DEVELOPER_CFLAGS += -Wdeclaration-after-statement
+DEVELOPER_CFLAGS += -Wformat-security
+DEVELOPER_CFLAGS += -Wno-format-zero-length
+DEVELOPER_CFLAGS += -Wold-style-definition
+DEVELOPER_CFLAGS += -Woverflow
+DEVELOPER_CFLAGS += -Wpointer-arith
+DEVELOPER_CFLAGS += -Wstrict-prototypes
+DEVELOPER_CFLAGS += -Wunused
+DEVELOPER_CFLAGS += -Wvla
 
 ifndef COMPILER_FEATURES
 COMPILER_FEATURES := $(shell ./detect-compiler $(CC))
 endif
 
 ifneq ($(filter clang4,$(COMPILER_FEATURES)),)
-CFLAGS += -Wtautological-constant-out-of-range-compare
+DEVELOPER_CFLAGS += -Wtautological-constant-out-of-range-compare
 endif
 
 ifneq ($(or $(filter gcc6,$(COMPILER_FEATURES)),$(filter clang4,$(COMPILER_FEATURES))),)
-CFLAGS += -Wextra
+DEVELOPER_CFLAGS += -Wextra
 # if a function is public, there should be a prototype and the right
 # header file should be included. If not, it should be static.
-CFLAGS += -Wmissing-prototypes
+DEVELOPER_CFLAGS += -Wmissing-prototypes
 ifeq ($(filter extra-all,$(DEVOPTS)),)
 # These are disabled because we have these all over the place.
-CFLAGS += -Wno-empty-body
-CFLAGS += -Wno-missing-field-initializers
-CFLAGS += -Wno-sign-compare
-CFLAGS += -Wno-unused-parameter
+DEVELOPER_CFLAGS += -Wno-empty-body
+DEVELOPER_CFLAGS += -Wno-missing-field-initializers
+DEVELOPER_CFLAGS += -Wno-sign-compare
+DEVELOPER_CFLAGS += -Wno-unused-parameter
 endif
 endif
 
 # uninitialized warnings on gcc 4.9.2 in xdiff/xdiffi.c and config.c
 # not worth fixing since newer compilers correctly stop complaining
 ifneq ($(filter gcc4,$(COMPILER_FEATURES)),)
 ifeq ($(filter gcc5,$(COMPILER_FEATURES)),)
-CFLAGS += -Wno-uninitialized
+DEVELOPER_CFLAGS += -Wno-uninitialized
 endif
 endif