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:
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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)
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All compilation options will be included recursively,
which will be delayed until the compilation options are actually used:
tools/Config.mk:
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define COMPILE
@echo "CC: $1"
$(Q) $(CC) -c $(CFLAGS) $($(strip $1)_CFLAGS) $1 -o $2
endef
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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>
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|---|---|---|
| .. | ||
| configs/nsh | ||
| include | ||
| scripts | ||
| src | ||
| Kconfig | ||
| README.txt | ||
README ====== This README discusses issues unique to NuttX configurations for the Axoloti open source synthesizer board featuring the STM32F427IGH6 MCU. The STM32F427IGH6 has a 180MHz Cortex-M4 core with 1MiB Flash memory and 256KiB of SRAM. The board features: - ADAU1961 24-bit 96 kHz stereo CODEC - 1/4" in/out jacks for analog audio signals - 3.5 mm jack for analog audio signals - 8 MiB of SDRAM (Alliance Memory AS4C4M16SA) - Serial MIDI in/out ports - SD Card slot - Two user LEDs and one (GPIO) push-button - USB OTG FS with Micro-AB connector (USB device mode operation) - USB OTG HS with Type-A connector (USB host mode operation) - Easy access to most IO pins Refer to http://www.axoloti.com/ for further information about this board.