STRLCPY/criu

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

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 <[email protected]>
Acked-by: Cyrill Gorcunov <[email protected]>
Signed-off-by: Andrei Vagin <[email protected]>

Radostin Stoyanov committed with Andrei Vagin 5 years ago

59930e5a

1 parent 69e35362

Revision indexing in progress... (symbol navigation in revisions will be accurate after indexed)

Total 1 files

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scripts/nmk/scripts/tools.mk

		skipped 3 lines
4	4		# System tools shorthands
5	5		RM := rm -f
6	6		HOSTLD ?= ld
7		-	LD ?= $(CROSS_COMPILE)$(HOSTLD)
	7	+	ifeq ($(origin LD), default)
	8	+	LD := $(CROSS_COMPILE)$(HOSTLD)
	9	+	endif
8	10		HOSTCC ?= gcc
9		-	CC ?= $(CROSS_COMPILE)$(HOSTCC)
	11	+	ifeq ($(origin CC), default)
	12	+	CC := $(CROSS_COMPILE)$(HOSTCC)
	13	+	endif
10	14		CPP := $(CC) -E
11	15		AS := $(CROSS_COMPILE)as
12	16		AR := $(CROSS_COMPILE)ar
		skipped 26 lines