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authorJames Morris <jmorris@namei.org>2015-08-26 08:24:23 +1000
committerJames Morris <james.l.morris@oracle.com>2015-08-26 08:24:23 +1000
commitf062bcaa2579af077313e989fc7dec777965a057 (patch)
tree8932ae4d98868dbb592c04cc18ca300dc4d4203f /scripts
parent3e5f206c00f73f535c914eedc8b91f424c5a14ab (diff)
parent3ee550f12c1529a023f71c9b5becb3351911047b (diff)
downloadlinux-f062bcaa2579af077313e989fc7dec777965a057.tar.gz
Merge tag 'modsign-pkcs7-20150814' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs into ra-next
Diffstat (limited to 'scripts')
-rw-r--r--scripts/Kbuild.include51
1 files changed, 51 insertions, 0 deletions
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index d3437b82ac25..608ac65c61e3 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -303,3 +303,54 @@ why = \
echo-why = $(call escsq, $(strip $(why)))
endif
+
+###############################################################################
+#
+# When a Kconfig string contains a filename, it is suitable for
+# passing to shell commands. It is surrounded by double-quotes, and
+# any double-quotes or backslashes within it are escaped by
+# backslashes.
+#
+# This is no use for dependencies or $(wildcard). We need to strip the
+# surrounding quotes and the escaping from quotes and backslashes, and
+# we *do* need to escape any spaces in the string. So, for example:
+#
+# Usage: $(eval $(call config_filename,FOO))
+#
+# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
+# transformed as described above to be suitable for use within the
+# makefile.
+#
+# Also, if the filename is a relative filename and exists in the source
+# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
+# be prefixed to *both* command invocation and dependencies.
+#
+# Note: We also print the filenames in the quiet_cmd_foo text, and
+# perhaps ought to have a version specially escaped for that purpose.
+# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
+# enough. It'll strip the quotes in the common case where there's no
+# space and it's a simple filename, and it'll retain the quotes when
+# there's a space. There are some esoteric cases in which it'll print
+# the wrong thing, but we don't really care. The actual dependencies
+# and commands *do* get it right, with various combinations of single
+# and double quotes, backslashes and spaces in the filenames.
+#
+###############################################################################
+#
+space_escape := %%%SPACE%%%
+#
+define config_filename
+ifneq ($$(CONFIG_$(1)),"")
+$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
+ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
+else
+ifeq ($$(wildcard $$($(1)_FILENAME)),)
+ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
+$(1)_SRCPREFIX := $(srctree)/
+endif
+endif
+endif
+endif
+endef
+#
+###############################################################################