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From "Eugene Koontz (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8196) avoid linker's stripping of dead code from interfering with configure's library name resolution
Date Thu, 22 Mar 2012 04:24:23 GMT
avoid linker's stripping of dead code from interfering with configure's library name resolution

                 Key: HADOOP-8196
                 URL: https://issues.apache.org/jira/browse/HADOOP-8196
             Project: Hadoop Common
          Issue Type: Bug
          Components: native
            Reporter: Eugene Koontz

The configure script generated by hadoop-common/hadoop-common-project/hadoop-common/src/main/native/configure.ac
uses the AC_COMPUTE_NEEDED_DSO m4 macro to generate a small probe program in C which it then
compiles and links, and then scans the resultant binary to find the names of certain libraries:
currently this is used for Zlib and Snappy.

I was unable to compile with -Pnative on my Ubuntu Linux install because configure could not
find libz and libsnappy. This turned out to be because the linker is removing the dependencies
on libz and libsnappy at link-time because the libraries in question are not used in the simple
probe code generated by the AC_COMPUTE_NEEDED_DSO m4 macro.

So my fix is modify the AC_COMPUTE_NEEDED_DSO to take another parameter that copies the given
argument's text into the C program. Then, in the call to AC_COMPUTE_NEEDED_DSO, we can use
this additional parameter, to include, in the generated C code, an actual library function
call for each library. This prevents the linker from removing the linkage to the desired libraries.

My gcc and ldd version information are given below:

eugene@latitude:~/hadoop-common$ gcc --version
gcc (Ubuntu/Linaro 4.6.3-1ubuntu3) 4.6.3
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO

eugene@latitude:~/hadoop-common$ ld --version
GNU ld (GNU Binutils for Ubuntu) 2.22
Copyright 2011 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later version.
This program has absolutely no warranty.


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