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nuttx/boards/arm/stm32/nucleo-f103rb
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chao.an b88561299b make/expression: improving up asm/C/C++ compile times 
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>
2020-11-02 07:53:53 -08:00
..
configs libc/stdio: Allocate file_struct dynamically 2020-09-11 17:58:17 +08:00
include Fix nxstyle warnings 2020-10-10 12:24:28 -06:00
scripts make/expression: improving up asm/C/C++ compile times 2020-11-02 07:53:53 -08:00
src Fix nxstyle warnings 2020-10-10 12:24:28 -06:00
Kconfig
README.txt

README.txt 

Nucleo-64 Boards
================

The Nucleo-F103RB is a member of the Nucleo-64 board family.  The Nucleo-64
is a standard board for use with several STM32 parts in the LQFP64 package.
Variants include

  Order code    Targeted STM32
  ------------- --------------
  NUCLEO-F030R8 STM32F030R8T6
  NUCLEO-F070RB STM32F070RBT6
  NUCLEO-F072RB STM32F072RBT6
  NUCLEO-F091RC STM32F091RCT6
  NUCLEO-F103RB STM32F103RBT6
  NUCLEO-F302R8 STM32F302R8T6
  NUCLEO-F303RE STM32F303RET6
  NUCLEO-F334R8 STM32F334R8T6
  NUCLEO-F401RE STM32F401RET6
  NUCLEO-F410RB STM32F410RBT6
  NUCLEO-F411RE STM32F411RET6
  NUCLEO-F446RE STM32F446RET6
  NUCLEO-L053R8 STM32L053R8T6
  NUCLEO-L073RZ STM32L073RZT6
  NUCLEO-L152RE STM32L152RET6
  NUCLEO-L452RE STM32L452RET6
  NUCLEO-L476RG STM32L476RGT6