Hi,
Am 27.12.2013 11:30, schrieb cedric.dewijs@xxxxxxxxxx:
This compiles and installs fine, but I see the following
error in /var/log/syslog when I start VDR
vdr: [8061] ERROR: /usr/lib/vdr/plugins/libvdr-sc.so.1.7.28:
undefined symbol: _Z18dvbcsa_bs_key_freeP15dvbcsa_bs_key_s
vdr: [8118] VDR version 1.7.28 started
I find this odd, because /usr/include/dvbcsa/dvbcsa.h contains
the function prototypes for both dvbcsa_bs_key_free and
dvbcsa_bs_key_s :
void dvbcsa_bs_key_free(struct dvbcsa_bs_key_s *key);
struct dvbcsa_bs_key_s * dvbcsa_bs_key_alloc(void);
But why are they concatenated into one symbol?
Looks like you are using a plain C library with C++. The
undefined symbol is a C++ decorated one:
corei7:~ # c++filt _Z18dvbcsa_bs_key_freeP15dvbcsa_bs_key_s
dvbcsa_bs_key_free(dvbcsa_bs_key_s*)
corei7:~ #
It seems like the header files for libdvbcsa are not prepared for
C++. So the compiler puts a reference for a C++ decorated symbol
into the object file which the linker cannot resolve as the
library seems to contain only plain C symbols.
Try to put the #include statements for those header files into an
extern C block, like this:
extern "C" {
#include "headerfile.h"
}
This makes the compiler interpret the header file as plain C and
-- as a result -- generate plain C symbol references.
Hope this helps.
Bye.
--
Dipl.-Inform. (FH) Reinhard Nissl
mailto:rnissl@xxxxxx
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