svn commit: r48261 - head/en_US.ISO8859-1/books/porters-handbook/makefiles
Mathieu Arnold <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.cvs.doc |
|---|---|
| Message-ID | <[email protected]> |
Author: mat
Date: Fri Feb 26 15:30:23 2016
New Revision: 48261
URL: https://svnweb.freebsd.org/changeset/doc/48261
Log:
Add a tip about opt_VARS and whitespace.
Reviewed by: wblock
Sponsored by: Absolight
Differential Revision: https://reviews.freebsd.org/D5447
Modified:
head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
Modified: head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
==============================================================================
--- head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml Fri Feb 26 10:34:51 2016 (r48260)
+++ head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml Fri Feb 26 15:30:23 2016 (r48261)
@@ -4487,6 +4487,22 @@ BIN3_BUILD= yes
.else
BIN3_BUILD= no
.endif</programlisting>
+
+ <tip>
+ <para>Values containing whitespace must be enclosed in
+ quotes:</para>
+
+ <programlisting>OPT_VARS= foo="bar baz"</programlisting>
+
+ <para>This is due to the way &man.make.1; variable expansion
+ deals with whitespace. When <literal>OPT_VARS= foo=bar
+ baz</literal> is expanded, the variable ends up
+ containing two strings, <literal>foo=bar</literal> and
+ <literal>baz</literal>. But the submitter probably
+ intended there to be only one string, <literal>foo=bar
+ baz</literal>. Quoting the value prevents whitespace
+ from being used as a delimiter.</para>
+ </tip>
</sect3>
<sect3 xml:id="options-dependencies">
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