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Re: [PATCH 2/5] build: add new make pattern for making file from file.src
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Fri, 14 Nov 2025 07:18:54 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 14 Nov 2025 06:19:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.11.25 17:49, Jan Beulich wrote:
On 11.11.2025 17:19, Juergen Gross wrote:
--- a/Config.mk
+++ b/Config.mk
@@ -159,6 +159,20 @@ define move-if-changed
if ! cmp -s $(1) $(2); then mv -f $(1) $(2); else rm -f $(1); fi
endef
+PATH_FILES := Paths
+INC_FILES := $(foreach f, $(PATH_FILES), $(XEN_ROOT)/config/$(f).mk)
+
+include $(INC_FILES)
+
+BUILD_MAKE_VARS := $(foreach f, $(PATH_FILES), $(shell awk '$$2 == ":=" {
print $$1; }' $(XEN_ROOT)/config/$(f).mk.in))
+
+define apply-build-vars
+ sed $(foreach v, $(BUILD_MAKE_VARS), -e 's#@$(v)@#$($(v))#g') <$< >$@
+endef
+
+%:: %.src
+ $(apply-build-vars)
I'm not convinced of having this here, rather than in less central places (say
under tools/ and docs/). I'm also not sure I really understand why it needs to
be .src - can't we stick to .in, enumerating the specific files that want
generating this way (thus avoiding accidental attempts to re-generate files
which need generating a different way)?
With enumerating the files to generate we could probably stick to *.in.
I'm fine with moving the rule to the tools and docs makefiles, but I'd
like to keep the apply-build-vars definition here in order to avoid
duplicating it.
Also - why the double colon here?
I've followed the advice in the make reference for "match-anything pattern
rules".
With enumerating the files to generate it should be possible to avoid the
double colon.
Juergen
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