[MacPorts] #49227: fix gcj in gcc5

[MacPorts]

#49227: fix gcj in gcc5
-----------------------------------+--------------------------------
 Reporter:  howarth.at.macports@…  |      Owner:  macports-tickets@…
     Type:  defect                 |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  ports                  |    Version:  2.3.4
 Keywords:                         |       Port:  gcc5
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 The attached Portfile.diff, gcj-libiconv-linkage.patch and boehm-gc-
 darwin15-hack.patch corrects the build of gcj so that it is functional.
 The changes include...

 1) Pass -with-libiconv-prefix=${prefix} to configure so that the proper
 libiconv is used (as the Portfile has depends_lib port:libiconv.

 2) Reduce alignment in boehm-gc to 2 with boehm-gc-darwin15-hack.patch in
 order to suppress breakage from the recompilation of the system
 libunwind.dylib against Apple Clang 7.0 in darwin15.

 3) Apply gcj-libiconv-linkage.patch to provide the appropriate linkage on
 libiconv automatically for executables created with gcj.

 4) In order to create ecj1 during the build, ecj-4.9.jar is added to
 distfiles and copied into the source directory as ecj.jar per upstream's
 build instructions for gcj.

 The functionality of the resulting gcj-mp-5 can be seen by compiling the
 testme.java source code....

 {{{
 public class testme {
   public static void main(String args[]){
     System.out.println("Hello");
   }
 }
 }}}

 using the command "gcj-mp-5 --main=testme -O testme.java" which will
 produce a functional a.out executable.

-- 
Ticket URL: <https://trac.macports.org/ticket/49227>
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