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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 47691] New: libtool invocations should use --tag
Date Wed, 12 Aug 2009 17:23:44 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=47691

           Summary: libtool invocations should use --tag
           Product: Apache httpd-2
           Version: 2.2.13
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Build
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: Ralf.Wildenhues@gmx.de


--- Comment #0 from Ralf Wildenhues <Ralf.Wildenhues@gmx.de> 2009-08-12 10:23:42 PDT
---
Created an attachment (id=24135)
patch

This thread is where the issue was originally detected:
http://thread.gmane.org/gmane.comp.gnu.libtool.general/10315
http://thread.gmane.org/gmane.comp.gnu.libtool.general/10308

One problem with the Apache build is that it does not use the --tag option
with libtool.  This prevents certain things that a user building httpd
might want to do.

First off, --tag is not needed if the C or C++ compiler used during the build
is identical (read: string comparison) to that used during configure time.
The libtool script then uses the appropriate set of values by matching the
compiler name.  This is less efficient than telling libtool which set of
values to use by passing --tag, but not a problem.

However, sometimes one wants to override the compiler at 'make' time, for
example to use purify as indicated above.  The error you then get from
  make CC='purify gcc'

is something like

  libtool: compile: unable to infer tagged configuration
  libtool: compile: specify a tag with `--tag'

and could have been prevented with the following patch.

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