This issue is caused by a bug in ecj 3.10 related to overridden methods
with a covariant return type. Here StringBuffer.class is missing bridge
methods matching the signature of the methods defined in the Appendable
class. javac and ecj 3.9 generate them properly. I reported the issue
upstream:
https://bugs.eclipse.org/438812
I tried to work around this issue by replacing 'name_sig->append' with
'name_sig->StringBuffer$append'. It compiles but break later in the
build process:
libtool: link: /home/ebourg/gcc/host-x86_64-linux-gnu/gcc/gcj
-B/home/ebourg/gcc/x86_64-linux-gnu/libjava/
-B/home/ebourg/gcc/host-x86_64-linux-gnu/gcc/
-B/home/packages/gcc/svn/jinstall/x86_64-linux-gnu/bin/
-B/home/packages/gcc/svn/jinstall/x86_64-linux-gnu/lib/ -isystem
/home/packages/gcc/svn/jinstall/x86_64-linux-gnu/include -isystem
/home/packages/gcc/svn/jinstall/x86_64-linux-gnu/sys-include
-fomit-frame-pointer -Usun -g -O2 -o .libs/jv-convert
--main=gnu.gcj.convert.Convert -shared-libgcc
-L/home/ebourg/gcc/x86_64-linux-gnu/libjava/.libs
-L/home/ebourg/gcc/x86_64-linux-gnu/libjava ./.libs/libgcj.so -lpthread
-lrt -ldl -Wl,-rpath -Wl,/home/packages/gcc/svn/jinstall/lib/../lib64
./.libs/libgcj.so: undefined reference to `java::lang::StringBuffer*
java::lang::StringBuffer::StringBuffer$append(wchar_t)'
collect2: error: ld returned 1 exit status
Emmanuel Bourg
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