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tools.mk: Define CC if not set to 'default'

Browse source 
FOO ?= bar

is equivalent to

	ifeq ($(origin FOO), undefined)
	FOO = bar
	endif

However, when CC is not set its value is 'default' rather than
'undefined'.

>From [1]:

'undefined': if variable was never defined.

'default': if variable has a default definition, as is usual with CC
and so on. See Variables Used by Implicit Rules. Note that if you have
redefined a default variable, the origin function will return the
origin of the later definition.

[1] https://www.gnu.org/software/make/manual/make.html

Signed-off-by: Radostin Stoyanov <rstoyanov1@gmail.com>
Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
This commit is contained in:
Radostin Stoyanov 2019-04-12 09:04:43 +01:00 • committed by Andrei Vagin
parent 69e3536285
commit 59930e5afb
1 changed files with 6 additions and 2 deletions
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8
scripts/nmk/scripts/tools.mk
View file

@ -4,9 +4,13 @@ ifndef ____nmk_defined__tools
# System tools shorthands
RM := rm -f
HOSTLD ?= ld
LD ?= $(CROSS_COMPILE)$(HOSTLD)
ifeq ($(origin LD), default)
LD := $(CROSS_COMPILE)$(HOSTLD)
endif
HOSTCC ?= gcc
CC ?= $(CROSS_COMPILE)$(HOSTCC)
ifeq ($(origin CC), default)
CC := $(CROSS_COMPILE)$(HOSTCC)
endif
CPP := $(CC) -E
AS := $(CROSS_COMPILE)as
AR := $(CROSS_COMPILE)ar