We occasionally get bug reports against GNU Classpath about strange compilation
errors. Kalle Olavi Niemitalo finally tracked it down. The order in which gcj -C
is given source files to compile. The smallest example given was:
gcj --bootclasspath '' --classpath .:vm/reference -C -d /tmp/obj
java/io/ObjectInputStream.java gnu/java/io/ClassLoaderObjectInputStream.java
gnu/java/rmi/server/RMIObjectInputStream.java
gnu/java/rmi/RMIMarshalledObjectInputStream.java
org/omg/CORBA/portable/InputStream.java
Which gives lots of errors like:
gnu/java/rmi/RMIMarshalledObjectInputStream.java:52: error: Class
'gnu.java.rmi.RMIMarshalledObjectInputStream' doesn't define the abstract method
'org.omg.CORBA.Object org.omg.CORBA.portable.InputStream.read_Object()' from
class 'org.omg.CORBA.portable.InputStream'. This method must be defined or class
'gnu.java.rmi.RMIMarshalledObjectInputStream' must be declared abstract.
public class RMIMarshalledObjectInputStream extends RMIObjectInputStream
Obviously gcj somehow picked up the wrong InputStream class from the
org.omg.CORBA.portable package instead of the java.io package.
No compilation errors occur when changing the order of arguments to:
gcj --bootclasspath '' --classpath .:vm/reference -C -d /tmp/obj
org/omg/CORBA/portable/InputStream.java java/io/ObjectInputStream.java
gnu/java/io/ClassLoaderObjectInputStream.java
gnu/java/rmi/server/RMIObjectInputStream.java
gnu/java/rmi/RMIMarshalledObjectInputStream.java
This is with either a GNU Classpath 0.15 release or a CVS checkout done in the
top level directory.
Similar bahavior in 3.3, 3.4, 4.0 and 4.1 branches:
gcj (GCC) 3.3.5 (Debian 1:3.3.5-12)
gcj-3.4 (GCC) 3.4.4 20050314 (prerelease) (Debian 3.4.3-12)
gcj (GCC) 4.0.1 20050505 (prerelease)
gcj (GCC) 4.1.0 20050501 (experimental)
For GNU Classpath CVS I will "workaround" this issue by sorting the classes file
list. That way at least we will get uniform bug reports not depending on the
order in which find returns the source files.
--
Summary: Order of source files matters when compiling
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: java
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: mark at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
dot org,kon at iki dot fi
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21418
