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)
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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:
--------------------------------------------------------------------------------
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>
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| .. | ||
| configs | ||
| include | ||
| scripts | ||
| src | ||
| Kconfig | ||
| README.txt | ||
Nucleo-144 Boards: ================ The Nucleo-F303ZE is a member of the Nucleo-144 board family. The Nucleo-144 is a standard board for use with several STM32 parts in the LQFP144 package. Variants include Order code Targeted STM32 ------------- -------------- NUCLEO-F207ZG STM32F207ZGT6 NUCLEO-F303ZE STM32F303ZET6 NUCLEO-F412ZG STM32F412ZGT6 NUCLEO-F413ZH STM32F413ZHT6 NUCLEO-F429ZI STM32F429ZIT6 NUCLEO-F439ZI STM32F439ZIT6 NUCLEO-F446ZE STM32F446ZET6 NUCLEO-F722ZE STM32F722ZET6 NUCLEO-F746ZG STM32F746ZGT6 NUCLEO-F756ZG STM32F756ZGT6 NUCLEO-F767ZI STM32F767ZIT6 NUCLEO-H743ZI STM32H743ZIT6 NUCLEO-L496ZG STM32L496ZGT6 NUCLEO-L496ZG-P STM32L496ZGT6P NUCLEO-L4A6ZG STM32L4A6ZGT6 NUCLEO-L4R5ZI STM32L4R5ZIT6 NUCLEO-L4R5ZI-P STM32L4R5ZIT6-P