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@@ -5,6 +5,17 @@
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# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
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#
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+# make nano-doc
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+# FOO = bar -- recursively expanded variable. Value is remebered verbatim.
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+# If it contains references to other variables, these references
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+# are expanded whenever this variable is _substituted_.
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+# FOO := bar -- simply expanded variable. Right hand is expanded when
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+# the variable is _defined_. Therefore faster than =.
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+# FOO ?= bar -- set a value only if it is not already set
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+# (behaves as =, not :=).
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+# FOO += bar -- append; if FOO is not defined, acts like = (not :=).
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+
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+
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# check for proper make version
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ifneq ($(findstring x3.7,x$(MAKE_VERSION)),)
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$(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
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@@ -66,6 +77,7 @@ export ARCH := $(shell uname -m | $(SED) -e s/i.86/i386/ \
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# mortals. Unless you hang out with the gods, you should
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# probably leave all this stuff alone.
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+
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# Pull in the user's uClibc configuration
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ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
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-include $(top_builddir).config
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@@ -148,7 +160,9 @@ check_ld=$(shell \
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ARFLAGS:=cr
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+
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# Flags in OPTIMIZATION are used only for non-debug builds
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+
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OPTIMIZATION:=
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# Use '-Os' optimization if available, else use -O2, allow Config to override
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OPTIMIZATION+=$(call check_gcc,-Os,-O2)
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@@ -168,6 +182,37 @@ OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
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OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)
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endif
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+
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+# CPU_CFLAGS-y contain options which are not warnings,
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+# not include or library paths, and not optimizations.
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+
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+# Why -funsigned-char: I hunted a bug related to incorrect
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+# sign extension of 'char' type for 10 hours straight. Not fun.
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+CPU_CFLAGS-y := -funsigned-char -fno-builtin
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+
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+CPU_CFLAGS-y += $(call check_gcc,-fno-asm,)
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+
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+LDADD_LIBFLOAT=
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+ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
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+# If -msoft-float isn't supported, we want an error anyway.
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+# Hmm... might need to revisit this for arm since it has 2 different
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+# soft float encodings.
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+ifneq ($(TARGET_ARCH),nios)
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+ifneq ($(TARGET_ARCH),nios2)
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+ifneq ($(TARGET_ARCH),sh)
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+CPU_CFLAGS-y += -msoft-float
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+endif
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+endif
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+endif
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+ifeq ($(TARGET_ARCH),arm)
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+# No longer needed with current toolchains, but leave it here for now.
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+# If anyone is actually still using gcc 2.95 (say), they can uncomment it.
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+# LDADD_LIBFLOAT=-lfloat
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+endif
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+endif
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+
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+CPU_CFLAGS-y += $(call check_gcc,-std=gnu99,)
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+
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CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
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CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
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@@ -468,9 +513,11 @@ ifeq ($(EXTRA_WARNINGS),y)
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XWARNINGS+=-Wnested-externs -Wshadow -Wmissing-noreturn -Wmissing-format-attribute -Wformat=2
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XWARNINGS+=-Wmissing-prototypes -Wmissing-declarations
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XWARNINGS+=-Wnonnull -Wundef
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-# works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
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+# Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
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#XWARNINGS+=-Wdeclaration-after-statement
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endif
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+# Seems to be unused (no ARCH_CFLAGS anywhere), delete?
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+# if yes, remove after 0.9.31
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XARCH_CFLAGS=$(subst ",, $(strip $(ARCH_CFLAGS)))
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CPU_CFLAGS=$(subst ",, $(strip $(CPU_CFLAGS-y)))
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@@ -484,41 +531,18 @@ SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
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endif
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NOSTDLIB_CFLAGS:=$(call check_gcc,-nostdlib,)
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-# Some nice CFLAGS to work with
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-# Why -funsigned-char: I hunted a bug related to incorrect
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-# sign extension of 'char' type for 10 hours straight. Not fun.
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+
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+# Collect all CFLAGS components
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CFLAGS := -include $(top_builddir)include/libc-symbols.h \
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$(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
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- -funsigned-char -fno-builtin -nostdinc -I$(top_builddir)include -I. \
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+ -nostdinc -I$(top_builddir)include -I. \
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-I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
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-
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-# Make sure that we can be built with non-C99 compilers, too.
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-# Use __\1__ instead.
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-CFLAGS += $(call check_gcc,-fno-asm,)
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ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
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CFLAGS += $(subst ",, $(UCLIBC_EXTRA_CFLAGS))
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endif
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-LDADD_LIBFLOAT=
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-ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
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-# If -msoft-float isn't supported, we want an error anyway.
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-# Hmm... might need to revisit this for arm since it has 2 different
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-# soft float encodings.
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-ifneq ($(TARGET_ARCH),nios)
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-ifneq ($(TARGET_ARCH),nios2)
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-ifneq ($(TARGET_ARCH),sh)
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-CFLAGS += -msoft-float
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-endif
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-endif
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-endif
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-ifeq ($(TARGET_ARCH),arm)
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-# No longer needed with current toolchains, but leave it here for now.
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-# If anyone is actually still using gcc 2.95 (say), they can uncomment it.
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-# LDADD_LIBFLOAT=-lfloat
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-endif
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-endif
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-
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# Please let us see private headers' parts
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+# Deprecated: _LIBC serves the same purpose
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CFLAGS += -DUCLIBC_INTERNAL
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# We need this to be checked within libc-symbols.h
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@@ -526,8 +550,6 @@ ifneq ($(HAVE_SHARED),y)
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CFLAGS += -DSTATIC
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endif
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-CFLAGS += $(call check_gcc,-std=gnu99,)
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-
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LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -Wl,-shared \
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-Wl,--warn-common -Wl,--warn-once -Wl,-z,combreloc
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# binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
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@@ -638,8 +660,9 @@ endif
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CFLAGS += -I$(KERNEL_HEADERS)
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#CFLAGS += -iwithprefix include-fixed -iwithprefix include
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-CC_IPREFIX:=$(shell $(CC) --print-file-name=include)
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-CFLAGS += -I$(dir $(CC_IPREFIX))/include-fixed -I$(CC_IPREFIX)
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+CC_IPREFIX := $(shell $(CC) --print-file-name=include)
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+CC_INC := -I$(dir $(CC_IPREFIX))include-fixed -I$(CC_IPREFIX)
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+CFLAGS += $(CC_INC)
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ifneq ($(DOASSERTS),y)
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CFLAGS+=-DNDEBUG
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Denis Vlasenko