Package: libxcb-shape0-dev
Version: 1.1-1.1
The header file xcb/shape.h can't be used in C++ directly because it is
missing the
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __cplusplus
} // extern "C"
#endif
wrappers. This causes linker errors, because to C and C++ the declarations in
the headers declare different symbols. Note that this doesn't only affect the
shape header, others are affected, too. I used
for i in /usr/include/xcb/*; do
grep 'extern "C"' $i >/dev/null || echo $i
done
to find header files without the wrapper and it reported a few more from other
XCB libraries:
/usr/include/xcb/bigreq.h
/usr/include/xcb/render.h
/usr/include/xcb/shape.h
/usr/include/xcb/shm.h
/usr/include/xcb/xc_misc.h
/usr/include/xcb/xcb_atom.h
/usr/include/xcb/xcb_renderutil.h
/usr/include/xcb/xcbxlib.h
/usr/include/xcb/xproto.h
Note: xproto.h might be a false positive, because it is included by xcb.h
inside its extern "C" wrapper. Further, you can't use it on its own anyway
due to its circular dependency on xcb.h. xproto.h defines its include-guard
macros and then includes xcb.h, which in turn includes xproto.h a second
time. However, the include guards make that a no-op so lateron when using
parts of xproto.h it fails. I don't think that file should be included on its
own but only by xcb.h, so it should generate a suitable error and the
#inlude "xcb.h" should be removed from it.
Workaround:
extern "C" {
#include <xcb/shape.h>
}
Uli
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