On a SMP machine, with "make -j4", I got
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/net/gnu-13/export/gnu/src/gcc/gcc/libjava/java/net/URL.java: In class
'java.net.VMNetworkInterface':
/net/gnu-13/export/gnu/src/gcc/gcc/libjava/java/net/URL.java: In method
'java.net.VMNetworkInterface.getInterfaces()':
/net/gnu-13/export/gnu/src/gcc/gcc/libjava/java/net/URL.java:1: fatal error:
can't create ./java/rmi/activation/ActivationMonitor.class: No such file or
directory
compilation terminated.
make[10]: *** [lists/gnu-src-gcc.stamp] Error 1
make[10]: *** Waiting for unfinished jobs....
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write_classfile in jcf-write.c:
/* The .class file is initially written to a ".tmp" file so that
if multiple instances of the compiler are running at once
they do not see partially formed class files. */
temporary_file_name = concat (class_file_name, ".tmp", NULL);
stream = fopen (temporary_file_name, "wb");
...
if (rename (temporary_file_name, class_file_name) == -1)
{
remove (temporary_file_name);
fatal_error ("can't create %s: %m", class_file_name);
}
There are at least 2 problems:
1. All processes use the same temporary_file_name. If 2 processes try to write
to the same class file, we are in trouble.
2. errno returned from rename is accessed after remove call which
may change errno.
--
Summary: A race condition in write_classfile
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: java
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: hjl at lucon dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25330
