From: W. Trevor King <wking@drexel.edu>
Date: Mon, 1 Sep 2008 00:27:09 +0000 (+0000)
Subject: Importing NanoBlogger post "More make idoms"
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=b15e9ddf46afb28e7cf49bdcd099ed8f60bd25f3;p=mw2txt.git

Importing NanoBlogger post "More make idoms"
---

diff --git a/posts/More_make_idoms.mdwn b/posts/More_make_idoms.mdwn
new file mode 100644
index 0000000..814c15c
--- /dev/null
+++ b/posts/More_make_idoms.mdwn
@@ -0,0 +1,43 @@
+[[!meta  title="More make idoms"]]
+[[!meta  date="2008-08-31 20:27:09"]]
+I'm rather proud of this one (can you tell I'm overhauling sawsim's
+Makefile ;).
+
+    $ cat Makefile
+    FILES = a b
+    DS = src
+    DT = targ
+
+    all : $(FILES:%=$(DT)/%)
+            @echo "got $^"
+            @echo "done"
+
+    clean :
+            rm -rf $(DT)
+
+    .SECONDEXPANSION:
+    #$(FILES:%=$(DT)/%) : $$($$@:$(DT)/%=$(DS)/%) $(DT)
+    #              This colon --^ produces: "target pattern contains no `%'."
+    # Instead use this idom --v
+    $(FILES:%=$(DT)/%) : $$(subst $(DT),$(DS),$$@) $(DT)
+            @echo "looking for $< for $@"
+
+    $(DT) :
+            mkdir $@
+    % :
+            @echo "missing rule for $@"
+
+    $ make
+    looking for src/a for targ/a
+    looking for src/b for targ/b
+    got targ/a targ/b
+    done
+
+Of course you could accomplish the same effect with
+
+   $(DT)/% : $(SRC)/%
+           @echo "looking for $< for %@"
+
+but what fun is that? ;)
+
+[[!tag  programming]]