diff options
Diffstat (limited to 'Rules.mak')
| -rw-r--r-- | Rules.mak | 87 |
1 files changed, 55 insertions, 32 deletions
@@ -5,6 +5,17 @@ # 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) @@ -66,6 +77,7 @@ export ARCH := $(shell uname -m | $(SED) -e s/i.86/i386/ \ # mortals. Unless you hang out with the gods, you should # probably leave all this stuff alone. + # Pull in the user's uClibc configuration ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),) -include $(top_builddir).config @@ -148,7 +160,9 @@ check_ld=$(shell \ 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+=$(call check_gcc,-Os,-O2) @@ -168,6 +182,37 @@ OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,) 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-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data @@ -468,9 +513,11 @@ ifeq ($(EXTRA_WARNINGS),y) 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))) @@ -484,41 +531,18 @@ SSP_CFLAGS := $(SSP_DISABLE_FLAGS) endif NOSTDLIB_CFLAGS:=$(call check_gcc,-nostdlib,) -# Some nice CFLAGS to work with -# Why -funsigned-char: I hunted a bug related to incorrect -# sign extension of 'char' type for 10 hours straight. Not fun. + +# Collect all CFLAGS components CFLAGS := -include $(top_builddir)include/libc-symbols.h \ $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \ - -funsigned-char -fno-builtin -nostdinc -I$(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 @@ -526,8 +550,6 @@ ifneq ($(HAVE_SHARED),y) 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 @@ -638,8 +660,9 @@ 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 |