[Bug java/21662] New: Fields in interfaces not optimized when read from *.class, but optimized when read from *.java

[jakub at gcc dot gnu dot org]

#!/bin/sh
rm -rf test
mkdir test
cat > test/Configuration.java <<EOF
package test;
public interface Configuration
{
  boolean INIT_LOAD_LIBRARY = false;
}
EOF
cat > test/Test.java <<EOF
package test;
import test.Configuration;
public class Test
{
  static
  {
    if (Configuration.INIT_LOAD_LIBRARY)
      {
        System.loadLibrary("gtkpeer");
      }
  }
}
EOF
gcj -C --classpath '' test/Test.java
mv test/Test.class{,.fromsrc}
gcj -C --classpath '' test/Configuration.java
gcj -C --classpath '' test/Test.java
mv test/Test.class{,.fromclass}
jcf-dump -c test/Test.class.fromsrc > test/fromsrc
jcf-dump -c test/Test.class.fromclass > test/fromclass
diff -u test/from{src,class}

In libjava build unless --enable-libgcj-multifile is used this has the bad
side effect that libgcj-4*.jar depends on the exact timing when doing make -jN
build (e.g. GdkTextLayout.java and Configuration.java are compiled about at the
same time, so if Configuration.java is compiled quickly enough
GdkTextLayout.class will not be as optimized as it could be, while
if Configuration.java compilation is tiny bit slower, GdkTextLayout.java's
compilation will read Configuration.java and optimize the bool test out.

-- 
           Summary: Fields in interfaces not optimized when read from
                    *.class, but optimized when read from *.java
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: java
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jakub at gcc dot gnu dot org
                CC: aph at gcc dot gnu dot org,gcc-bugs at gcc dot gnu dot
                    org,java-prs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21662