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dependencies: check minimal make version early on

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Although support/dependencies/dependencies.sh checks for the version of make,
this script doesn't get a chance to run if make encounters a syntax error as a
result of being too old.

For example, the following syntax is only supported from make 3.81 onwards:

ifeq ($(BR2_TOOLCHAIN_BUILDROOT),y)
include toolchain/toolchain-buildroot.mk
else ifeq ($(BR2_TOOLCHAIN_EXTERNAL),y)
include toolchain/toolchain-external.mk
else ifeq ($(BR2_TOOLCHAIN_CTNG),y)
include toolchain/toolchain-crosstool-ng.mk
endif

This patch adds a check for the version of make very early in the Makefile, so
that old make versions are handled gracefully.

[Peter: simplify check]
Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Thomas De Schampheleire 2012-02-08 17:22:17 +01:00 committed by Peter Korsgaard
parent a792668b58
commit 0edfb24c38
1 changed files with 6 additions and 0 deletions
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6
Makefile
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@ -26,6 +26,12 @@
# Set and export the version string
export BR2_VERSION:=2012.02-git
# Check for minimal make version (note: this check will break at make 10.x)
MIN_MAKE_VERSION=3.81
ifeq ($(firstword $(sort $(MAKE_VERSION) $(MIN_MAKE_VERSION))),$(MAKE_VERSION))
$(error You have make '$(MAKE_VERSION)' installed. GNU make >= $(MIN_MAKE_VERSION) is required)
endif
# This top-level Makefile can *not* be executed in parallel
.NOTPARALLEL: