# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
#
+# make nano-doc
+# FOO = bar -- recursively expanded variable. Value is remebered verbatim.
+# If it contains references to other variables, these references
+# are expanded whenever this variable is _substituted_.
+# FOO := bar -- simply expanded variable. Right hand is expanded when
+# the variable is _defined_. Therefore faster than =.
+# FOO ?= bar -- set a value only if it is not already set
+# (behaves as =, not :=).
+# FOO += bar -- append; if FOO is not defined, acts like = (not :=).
+
+
# check for proper make version
ifneq ($(findstring x3.7,x$(MAKE_VERSION)),)
$(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
STRIP_FLAGS ?= -x -R .note -R .comment
-UNIFDEF := $(top_builddir)extra/scripts/unifdef -UUCLIBC_INTERNAL
+## unused? if yes, remove after 0.9.31
+## UNIFDEF := $(top_builddir)extra/scripts/unifdef -UUCLIBC_INTERNAL
# Select the compiler needed to build binaries for your development system
HOSTCC = gcc
-BUILD_CFLAGS = -O2 -Wall
+BUILD_CFLAGS = -Os -Wall
export ARCH := $(shell uname -m | $(SED) -e s/i.86/i386/ \
-e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
-e s/arm.*/arm/ -e s/sa110/arm/ \
# mortals. Unless you hang out with the gods, you should
# probably leave all this stuff alone.
+
# Pull in the user's uClibc configuration
ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
-include $(top_builddir).config
ARFLAGS:=cr
+
# Flags in OPTIMIZATION are used only for non-debug builds
+
OPTIMIZATION:=
# Use '-Os' optimization if available, else use -O2, allow Config to override
OPTIMIZATION+=$(call check_gcc,-Os,-O2)
OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)
endif
+
+# CPU_CFLAGS-y contain options which are not warnings,
+# not include or library paths, and not optimizations.
+
+# Why -funsigned-char: I hunted a bug related to incorrect
+# sign extension of 'char' type for 10 hours straight. Not fun.
+CPU_CFLAGS-y := -funsigned-char -fno-builtin
+
+CPU_CFLAGS-y += $(call check_gcc,-fno-asm,)
+
+LDADD_LIBFLOAT=
+ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
+# If -msoft-float isn't supported, we want an error anyway.
+# Hmm... might need to revisit this for arm since it has 2 different
+# soft float encodings.
+ifneq ($(TARGET_ARCH),nios)
+ifneq ($(TARGET_ARCH),nios2)
+ifneq ($(TARGET_ARCH),sh)
+CPU_CFLAGS-y += -msoft-float
+endif
+endif
+endif
+ifeq ($(TARGET_ARCH),arm)
+# No longer needed with current toolchains, but leave it here for now.
+# If anyone is actually still using gcc 2.95 (say), they can uncomment it.
+# LDADD_LIBFLOAT=-lfloat
+endif
+endif
+
+CPU_CFLAGS-y += $(call check_gcc,-std=gnu99,)
+
CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
# NB: this may make SSE insns segfault!
# -O1 -march=pentium3, -Os -msse etc are known to be affected.
# See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
- OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
+ # -m32 is needed if host is 64-bit
+ OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
else
OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=4,)
endif
# Keep the check_gcc from being needlessly executed
ifndef PIEFLAG
-ifneq ($(UCLIBC_BUILD_PIE),y)
-export PIEFLAG:=
-else
export PIEFLAG:=$(call check_gcc,$(PIEFLAG_NAME),$(PICFLAG))
endif
-endif
# We need to keep track of both the CC PIE flag (above) as
# well as the LD PIE flag (below) because we can't rely on
-# gcc passing -pie if we used -fPIE
+# gcc passing -pie if we used -fPIE. We need to directly use -pie
+# instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
ifndef LDPIEFLAG
-ifneq ($(UCLIBC_BUILD_PIE),y)
-export LDPIEFLAG:=
-else
-export LDPIEFLAG:=$(shell $(LD) --help 2>/dev/null | grep -q -- -pie && echo "-Wl,-pie")
+export LDPIEFLAG:=$(shell $(LD) --help 2>/dev/null | grep -q -- -pie && echo "-pie")
+endif
+
+# Check for --as-needed support in linker
+ifndef LD_FLAG_ASNEEDED
+_LD_FLAG_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -- --as-needed)
+ifneq ($(_LD_FLAG_ASNEEDED),)
+export LD_FLAG_ASNEEDED:=--as-needed
+endif
+endif
+ifndef LD_FLAG_NO_ASNEEDED
+ifdef LD_FLAG_ASNEEDED
+export LD_FLAG_NO_ASNEEDED:=--no-as-needed
+endif
+endif
+ifndef CC_FLAG_ASNEEDED
+ifdef LD_FLAG_ASNEEDED
+export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
+endif
+endif
+ifndef CC_FLAG_NO_ASNEEDED
+ifdef LD_FLAG_NO_ASNEEDED
+export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
endif
endif
+link.asneeded = $(if $(and $(CC_FLAG_ASNEEDED),$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
# Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
ifndef ASNEEDED
XWARNINGS+=-Wnested-externs -Wshadow -Wmissing-noreturn -Wmissing-format-attribute -Wformat=2
XWARNINGS+=-Wmissing-prototypes -Wmissing-declarations
XWARNINGS+=-Wnonnull -Wundef
-# works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
+# Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
#XWARNINGS+=-Wdeclaration-after-statement
endif
+# Seems to be unused (no ARCH_CFLAGS anywhere), delete?
+# if yes, remove after 0.9.31
XARCH_CFLAGS=$(subst ",, $(strip $(ARCH_CFLAGS)))
CPU_CFLAGS=$(subst ",, $(strip $(CPU_CFLAGS-y)))
endif
NOSTDLIB_CFLAGS:=$(call check_gcc,-nostdlib,)
-# Some nice CFLAGS to work with
+
+# Collect all CFLAGS components
CFLAGS := -include $(top_builddir)include/libc-symbols.h \
$(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
- -fno-builtin -nostdinc -I$(top_builddir)include -I. \
+ -nostdinc -I$(top_builddir)include -I. \
-I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
-
-# Make sure that we can be built with non-C99 compilers, too.
-# Use __\1__ instead.
-CFLAGS += $(call check_gcc,-fno-asm,)
ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
CFLAGS += $(subst ",, $(UCLIBC_EXTRA_CFLAGS))
endif
-LDADD_LIBFLOAT=
-ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
-# If -msoft-float isn't supported, we want an error anyway.
-# Hmm... might need to revisit this for arm since it has 2 different
-# soft float encodings.
-ifneq ($(TARGET_ARCH),nios)
-ifneq ($(TARGET_ARCH),nios2)
-ifneq ($(TARGET_ARCH),sh)
-CFLAGS += -msoft-float
-endif
-endif
-endif
-ifeq ($(TARGET_ARCH),arm)
-# No longer needed with current toolchains, but leave it here for now.
-# If anyone is actually still using gcc 2.95 (say), they can uncomment it.
-# LDADD_LIBFLOAT=-lfloat
-endif
-endif
-
# Please let us see private headers' parts
+# Deprecated: _LIBC serves the same purpose
CFLAGS += -DUCLIBC_INTERNAL
# We need this to be checked within libc-symbols.h
CFLAGS += -DSTATIC
endif
-CFLAGS += $(call check_gcc,-std=gnu99,)
-
LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -Wl,-shared \
-Wl,--warn-common -Wl,--warn-once -Wl,-z,combreloc
# binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
# Be sure that binutils support it
LDFLAGS_GNUHASH:=$(call check_ld,--hash-style=gnu)
ifeq ($(LDFLAGS_GNUHASH),)
+ifneq ($(filter-out install_headers,$(MAKECMDGOALS)),)
$(error Your binutils don't support --hash-style option, while you want to use it)
+endif
else
LDFLAGS_NOSTRIP += -Wl,$(LDFLAGS_GNUHASH)
endif
CFLAGS += -I$(KERNEL_HEADERS)
#CFLAGS += -iwithprefix include-fixed -iwithprefix include
-CC_IPREFIX:=$(shell $(CC) --print-file-name=include)
-CFLAGS += -I$(dir $(CC_IPREFIX))/include-fixed -I$(CC_IPREFIX)
+CC_IPREFIX := $(shell $(CC) --print-file-name=include)
+CC_INC := -I$(dir $(CC_IPREFIX))include-fixed -I$(CC_IPREFIX)
+CFLAGS += $(CC_INC)
ifneq ($(DOASSERTS),y)
CFLAGS+=-DNDEBUG
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