Bug 1045723

Right, this looks like an off-by-one'ish thing with parametrized macros. The effect is reproducable with just this:

--
%define foo(x) echo "FOO"

%foo -x
echo hello
--

If %foo is "called" with -x, "hello" ends up on the same line, otherwise it goes on a line of its own. I'll have a closer look when back at work next week, but the behavior seems to be ages old (present in rpm 4.4.x too)

IIRC I've always ended parametrized macro definitions with %{nil}, don't remember exactly why but I suppose it could have been in order to avoid this very issue.

Yeah, %{nil} at end avoids the issue, and given all the quirks in macro processing people just tend to use whatever gets the job done, whether the whatever makes sense or not.

For added fun, merely adding a trailing space is enough to trigger this "behavior" too, ie '%foo ' will also cause the newline to be silently eaten away. I've a preliminary fix for it, the remaining question is whether there are people actually relying on that longstanding quirk.

Fixed upstream now: http://rpm.org/gitweb?p=rpm.git;a=commitdiff;h=1bdcd0500865efd3566efd7f951228f69b58e755

I guess I'd better stick that into rawhide rpm and see what blows up :)

FYI, this just went into rawhide as of rpm-4.11.2-3, lets see what (if anything) happens...

(In reply to Panu Matilainen from comment #5)
> FYI, this just went into rawhide as of rpm-4.11.2-3, lets see what (if
> anything) happens...

This change breaks many macros used by Java packages

Macro definition (see also [1]):

%pom_xpath_inject()   %{expand: %{__pom_call}xpath_inject   %*
}

Macro call (see also [2]):

# use java 5 generics in modello plugin
%pom_xpath_inject "pom:plugin[pom:artifactId[text()='modello-maven-plugin']]"\
"/pom:executions/pom:execution/pom:configuration" \
"<useJava5>true</useJava5>" doxia-modules/doxia-module-fml/pom.xml

macro expansion diff between rpm 4.11.2-2 and 4.11.2-3:

--- old	2014-03-27 08:49:54.262248366 +0100
+++ new	2014-03-27 08:40:54.969246312 +0100
@@ -1,4 +1,5 @@
 # use java 5 generics in modello plugin
  python /usr/share/java-utils/pom_editor.py pom_xpath_inject   "pom:plugin[pom:artifactId[text()='modello-maven-plugin']]"\
+
 "/pom:executions/pom:execution/pom:configuration" \
 "<useJava5>true</useJava5>" doxia-modules/doxia-module-fml/pom.xml

There's new line added which breaks the code.

[1] https://github.com/mizdebsk/javapackages/blob/master/macros.d/macros.fjava#L197-L198
[2] http://pkgs.fedoraproject.org/cgit/maven-doxia.git/tree/maven-doxia.spec#n272

So, that'd be ... a macro argument with a literal line-continuation in it, or something like that. Eep.

I've reverted the change while I scratch my with this.

I also faced this bug when trying to use %autosetup -S git. :P

FWIW this should be now fixed in F21 + rawhide, in a way that doesn't break the Java macros.

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