Huh. Can you make V=1 to build libmpi and use the same kind of options to build
your sample library?
Sent from my PDA. No type good.
On Oct 14, 2010, at 6:01 PM, "Jed Brown" <j...@59a2.org> wrote:
> On Thu, Oct 14, 2010 at 23:53, Jeff Squyres <jsquy...@cisco.com> wrote:
> The configure test essentially looks like this -- could you try this manually
> and see what happens?
>
> cat > conftest_weak.h <<EOF
> int real(int i);
> int fake(int i);
> EOF
>
> cat > conftest_weak.c <<EOF
> #include "conftest_weak.h"
> #pragma weak fake = real
> int real(int i) { return i; }
> EOF
>
> cat > conftest.c <<EOF
> #include "conftest_weak.h"
> int main() { return fake(3); }
> EOF
>
> # Try the compile
> clang $CFLAGS -c conftest_weak.c
> clang $CFLAGS conftest.c conftest_weak.o -o conftest $LDFLAGS $LIBS
>
> The configure test rules that weak symbol support is there if both compiler
> invocations return an exit status of 0.
>
> They exit 0 and
>
> $ nm conftest |g 'real|fake'
> 00000000004004a0 W fake
> 00000000004004a0 T real
>
> so it looks like that is working fine. It also works fine when I stuff it
> into a shared library:
>
> $ clang -c -fPIC conftest_weak.c
> $ clang -shared -fPIC conftest.c conftest_weak.o -o conftest.so
> $ nm conftest.so |g 'real|fake'
> 00000000000005a0 W fake
> 00000000000005a0 T real
>
> Jed
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