b88561299b
In the current compilation environment, the recursive assignment(=) for compile
flags will be delayed until every file is actually need to be compile.
For example:
--------------------------------------------------------------------------------
arch/arm/src/Makefile:
INCLUDES += ${shell $(INCDIR) "$(CC)" $(ARCH_SRCDIR)$(DELIM)chip}
INCLUDES += ${shell $(INCDIR) "$(CC)" $(ARCH_SRCDIR)$(DELIM)common}
INCLUDES += ${shell $(INCDIR) "$(CC)" $(ARCH_SRCDIR)$(DELIM)$(ARCH_SUBDIR)}
INCLUDES += ${shell $(INCDIR) "$(CC)" $(TOPDIR)$(DELIM)sched}
CPPFLAGS += $(INCLUDES) $(EXTRAFLAGS)
CFLAGS += $(INCLUDES) $(EXTRAFLAGS)
CXXFLAGS += $(INCLUDES) $(EXTRAFLAGS)
AFLAGS += $(INCLUDES) $(EXTRAFLAGS)
--------------------------------------------------------------------------------
All compilation options will be included recursively,
which will be delayed until the compilation options are actually used:
tools/Config.mk:
--------------------------------------------------------------------------------
define COMPILE
@echo "CC: $1"
$(Q) $(CC) -c $(CFLAGS) $($(strip $1)_CFLAGS) $1 -o $2
endef
--------------------------------------------------------------------------------
All compile flags to be reexecuted $(INCDIR) as long as one file needs to be compiled,
but in fact, the compilation options have not changed in the current directory.
So the we recommand to change the syntax of assignment
From
Recursive (=)
To
Simple (:=)
In this way, we can ensure that all compilation options are expanded only once and reducing repeated works.
Signed-off-by: chao.an <anchao@xiaomi.com>
100 lines
3.4 KiB
Plaintext
100 lines
3.4 KiB
Plaintext
############################################################################
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# boards/arm/stm32/stm32f4discovery/scripts/Make.defs
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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include $(TOPDIR)/.config
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include $(TOPDIR)/tools/Config.mk
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include $(TOPDIR)/arch/arm/src/armv7-m/Toolchain.defs
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LDSCRIPT = ld.script
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ifeq ($(CONFIG_CYGWIN_WINTOOL),y)
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ARCHSCRIPT = -T "${shell cygpath -w $(BOARD_DIR)$(DELIM)scripts$(DELIM)$(LDSCRIPT)}"
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else
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ARCHSCRIPT = -T$(BOARD_DIR)$(DELIM)scripts$(DELIM)$(LDSCRIPT)
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endif
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ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
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ARCHOPTIMIZATION = -g
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endif
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ifneq ($(CONFIG_DEBUG_NOOPT),y)
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ARCHOPTIMIZATION += $(MAXOPTIMIZATION) -fno-strict-aliasing -fomit-frame-pointer
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endif
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ARCHCFLAGS = -fno-builtin
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ARCHCXXFLAGS = -fno-builtin -fno-exceptions -fcheck-new
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ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -Wundef
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ARCHWARNINGSXX = -Wall -Wshadow -Wundef
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ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10
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ifeq ($(CONFIG_ARMV7M_TOOLCHAIN_CLANGL),y)
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ARCHCFLAGS += -nostdlib -ffreestanding
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ARCHCXXFLAGS += -nostdlib -ffreestanding
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else
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ARCHCFLAGS += -funwind-tables
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ARCHCXXFLAGS += -fno-rtti -funwind-tables
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ifneq ($(CONFIG_DEBUG_NOOPT),y)
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ARCHOPTIMIZATION += -fno-strength-reduce
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endif
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endif
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CFLAGS := $(ARCHCFLAGS) $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
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CPICFLAGS = $(ARCHPICFLAGS) $(CFLAGS)
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CXXFLAGS := $(ARCHCXXFLAGS) $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
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CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
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CPPFLAGS := $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS)
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AFLAGS := $(CFLAGS) -D__ASSEMBLY__
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NXFLATLDFLAGS1 = -r -d -warn-common
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NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-pcrel.ld -no-check-sections
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LDNXFLATFLAGS = -e main -s 2048
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# Loadable module definitions
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CMODULEFLAGS = $(CFLAGS) -mlong-calls # --target1-abs
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LDMODULEFLAGS = -r -e module_initialize
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ifeq ($(CONFIG_CYGWIN_WINTOOL),y)
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LDMODULEFLAGS += -T "${shell cygpath -w $(TOPDIR)/libs/libc/modlib/gnu-elf.ld}"
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else
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LDMODULEFLAGS += -T $(TOPDIR)/libs/libc/modlib/gnu-elf.ld
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endif
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# ELF module definitions
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CELFFLAGS = $(CFLAGS) -mlong-calls # --target1-abs
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CXXELFFLAGS = $(CXXFLAGS) -mlong-calls # --target1-abs
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LDELFFLAGS = -r -e main
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ifeq ($(CONFIG_CYGWIN_WINTOOL),y)
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LDELFFLAGS += -T "${shell cygpath -w $(BOARD_DIR)$(DELIM)scripts$(DELIM)gnu-elf.ld}"
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else
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LDELFFLAGS += -T $(BOARD_DIR)$(DELIM)scripts$(DELIM)gnu-elf.ld
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endif
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ifneq ($(CROSSDEV),arm-nuttx-elf-)
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LDFLAGS += -nostartfiles -nodefaultlibs
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endif
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ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
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LDFLAGS += -g
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endif
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