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nuttx/boards/arm/sama5/sama5d4-ek/configs
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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
..
at25boot libc/stdio: Allocate file_struct dynamically 2020-09-11 17:58:17 +08:00
bridge libc/stdio: Allocate file_struct dynamically 2020-09-11 17:58:17 +08:00
dramboot libc/stdio: Allocate file_struct dynamically 2020-09-11 17:58:17 +08:00
elf libc/stdio: Allocate file_struct dynamically 2020-09-11 17:58:17 +08:00
ipv6 libc/stdio: Allocate file_struct dynamically 2020-09-11 17:58:17 +08:00
knsh make/expression: improving up asm/C/C++ compile times 2020-11-02 07:53:53 -08:00
nsh libc/stdio: Allocate file_struct dynamically 2020-09-11 17:58:17 +08:00
nxwm libc/stdio: Allocate file_struct dynamically 2020-09-11 17:58:17 +08:00
ramtest libc/stdio: Allocate file_struct dynamically 2020-09-11 17:58:17 +08:00