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>
|
||
|---|---|---|
| .. | ||
| configs/nsh | ||
| include | ||
| scripts | ||
| src | ||
| Kconfig | ||
| README-qemu.txt | ||
| README.txt | ||
1. Download and install toolchain $ curl https://static.dev.sifive.com/dev-tools/riscv64-unknown-elf-gcc-8.3.0-2019.08.0-x86_64-linux-ubuntu14.tar.gz 2. Download and install J-Link Software Documentation Pack https://www.segger.com/downloads/jlink/ $ sudo apt install JLink_Linux_V656b_x86_64.deb 3. Configure and build NuttX $ mkdir ./nuttx; cd ./nuttx $ git clone https://bitbucket.org/nuttx/nuttx.git $ git clone https://bitbucket.org/nuttx/apps.git $ cd nuttx $ make distclean $ ./tools/configure.sh hifive1-revb:nsh $ make V=1 4. Flash the nuttx with J-Link and run $ picocom -b 115200 /dev/ttyACM0 $ /opt/SEGGER/JLink_V656b/JLinkGDBServer -device FE310 $ riscv64-unknown-elf-gdb ./nuttx (gdb) target extended-remote:2331 (gdb) load nuttx (gdb) c 5. TODO Support GPIO/SPI/I2C/RTC/WDT/PWM Support RISC-V User mode