Am Mittwoch 27 September 2006 00:02 schrieb Marcel Holtmann:
> only because Debian thinks this is the right way, it must not be true.
> Where is the pkg-config documentation that shows this is the correct way
> to achieve this?
From pkg-config manpage:
Libs.private:
This line should list any private libraries in use. Private
libraries are libraries which are not exposed through your
library, but are needed in the case of static linking.
The purpose of this option is exactly what I mentioned. It is present since
pkg-config 0.18 (current is 0.21).
"exposed" means that e.g. bluetooth or usb library symbols are used in macros
or inline functions. Every foreign library symbol used in a non-inlined
function is private to the lib.
For static linking, all of libopenobex is compiled into the program and thus
all foreign libs must be linked, too.
The following option for ld does something similar but either needs careful
usage or pure guessing (may break some C++ libs):
--as-needed
--no-as-needed
This option affects ELF DT_NEEDED tags for dynamic libraries men‐
tioned on the command line after the --as-needed option. Normally,
the linker will add a DT_NEEDED tag for each dynamic library men‐
tioned on the command line, regardless of whether the library is
actually needed. --as-needed causes DT_NEEDED tags to only be
emitted for libraries that satisfy some symbol reference from regu‐
lar objects which is undefined at the point that the library was
linked. --no-as-needed restores the default behaviour.
For obexftp, this will have no effect as it used libusb and libbluetooth
symbols itself. For my own app (obexpushd), only linking
to -lopenobex -lbluetooth is fully sufficient, -lusb is not needed.
BTW: you implicitly use this in for openobex.m4, as testing for presence only
links with -lopenobex.
WISHLIST: get rid of openobex.m4 and advertise PKG_CONFIG_* m4 macros instead.
As an alternative, make it a simple wrapper around pkg-config.
HS
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