Problems building IcedTea with clang

[Henrik /KaarPoSoft]

Dear all,

I have build IcedTea 2.4.0 with gcc 4.7.2 without problems.

However, building fails with clang 3.2.

Before digging myself into debugging this, I would like to reach out to you
on this list for any insights you may have on the issue.
I can hardly think I am the first one to try building IcedTea with clang...

To build with clang I use the same build script as for gcc, but start with:

CC="clang"; export CC
CXX="clang++"; export CXX

The build starts as expected, and it seems that clang is indeed being
used as the compiler.

However, building fails with
non-void function 'getDefaultScopeID' should return a value [-Wreturn-type]
in src/solaris/native/java/net/net_util_md.c:117:9
(the relevant part of the log is attached).

In net_util_md.c:117 we have a CHECK_NULL
which expands to "if ((x) == NULL) return;"
which is  problematic
as it is a return without value inside a non-void function.

If I understand correctly, this is not allowed in c99.

So I tried

CC="clang -std=gnu89"; export CC
CXX="clang++ -std=gnu89"; export CXX

but this also fails in the same way (log attached).

I could of course patch this manually, but I am fearing that I will run into
many more such issues in an uphill battle.

So: Has anyone build IcedTea 2.4.0 with clang 3.2 ?
Or maybe with some other version combination ?

Any hints would be most appreciated!

/Henrik
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