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authorGravatar Yann E. MORIN <yann.morin.1998@free.fr>2016-10-14 16:39:22 +0200
committerGravatar Peter Korsgaard <peter@korsgaard.com>2016-10-16 13:01:02 +0200
commit339e1c9500cd1057118576c51be4953c23bc7a40 (patch)
tree739bc3410c4368d806fd0adcfd7d2d8afefd2ee3 /support/misc
parent1b496d40e3457e42fcf35004c677af4dc91dd935 (diff)
downloadbuildroot-339e1c9500cd1057118576c51be4953c23bc7a40.tar.gz
buildroot-339e1c9500cd1057118576c51be4953c23bc7a40.tar.bz2
core: allow a br2-external tree to override a defconfig
Currently, it is not possible for a br2-external tree to override a defconfig bundled in Buildroot, nor is it possible to override one from a previous br2-external tree in the stack. However, it is interesting that a latter br2-external tree be able to override a defconfig: - the ones bundled in Buildroot are minimalist, and almost always build a toolchain, so a br2-external tree may want to provide a "better" defconfig (better, in the sense "suited for the project"); - similarly for a defconfig from a previous br2-external tree. But we can't do that, as the rules for the defconfigs are generated in the order the br2-external trees are specified, all after the bundled defconfigs. Those rule are patten-matching rules, which means that the first one to match is used, and the following ones are ignored. Add a new utility macro, 'reverse', inspired from GMSL, that does what it says: reverse a list of words. Use that macro to reverse the list of br2-external trees, so that the latters win over the formers, and even over bundled ones. Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Arnout Vandecappelle <arnout@mind.be> Cc: Samuel Martin <s.martin49@gmail.com> Cc: Romain Naour <romain.naour@openwide.fr> Cc: Julien CORJON <corjon.j@ecagroup.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Diffstat (limited to 'support/misc')
-rw-r--r--support/misc/utils.mk4
1 files changed, 4 insertions, 0 deletions
diff --git a/support/misc/utils.mk b/support/misc/utils.mk
index 990a3d1fd6..c44319338e 100644
--- a/support/misc/utils.mk
+++ b/support/misc/utils.mk
@@ -46,6 +46,10 @@ endef
$(eval $(call caseconvert-helper,UPPERCASE,$(join $(addsuffix :,$([FROM])),$([TO]))))
$(eval $(call caseconvert-helper,LOWERCASE,$(join $(addsuffix :,$([TO])),$([FROM]))))
+# Reverse the orders of words in a list. Again, inspired by the gmsl
+# 'reverse' macro.
+reverse = $(if $(1),$(call reverse,$(wordlist 2,$(words $(1)),$(1))) $(firstword $(1)))
+
# Sanitize macro cleans up generic strings so it can be used as a filename
# and in rules. Particularly useful for VCS version strings, that can contain
# slashes, colons (OK in filenames but not in rules), and spaces.