configure.ac: make output when no specs are present more friendly?
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                 Key: QPID-1709
                 URL: https://issues.apache.org/jira/browse/QPID-1709
             Project: Qpid
          Issue Type: Improvement
          Components: Build Tools
    Affects Versions: M4
         Environment: Linux
            Reporter: Steve Huston
            Priority: Trivial
             Fix For: M5


This came up on the users list... if a user with a released version of the C++ 
kit (say, M4) runs configure and it detects that there's no xml spec, all that 
shows in the output is the error from 'ls' saying there's no xml file. I think 
it may be better to inform the user of what's going on, with output such as:

...
checking for rpmlint... no
checking for ruby... ruby
configure: AMQP specs not present; source code will not be generated.
checking boost/shared_ptr.hpp usability... yes
...

This is with the following patch to configure.ac:

Index: configure.ac
===================================================================
--- configure.ac        (revision 749505)
+++ configure.ac        (working copy)
@@ -150,8 +150,9 @@
 
 specdir=`pwd`/$srcdir/../specs  
 AMQP_FINAL_XML=$specdir/amqp.0-10-qpid-errata.xml
+test -f $AMQP_FINAL_XML || AC_MSG_NOTICE([AMQP specs not present; source code 
will not be generated.])
 AC_SUBST(AMQP_FINAL_XML)
-AM_CONDITIONAL([GENERATE], [ls $AMQP_FINAL_XML >/dev/null])
+AM_CONDITIONAL([GENERATE], [test -f $AMQP_FINAL_XML])
 
 # URL and download URL for the package.
 URL=http://rhm.et.redhat.com/qpidc

What do you think about this in general, and about commiting it for M5?

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