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* v4l-utils  undefined symbol: dvb_dev_alloc
@ 2019-10-12 17:28 _ _ _ _ _
  2019-10-12 18:02 ` Mauro Carvalho Chehab
  0 siblings, 1 reply; 4+ messages in thread
From: _ _ _ _ _ @ 2019-10-12 17:28 UTC (permalink / raw)
  To: linux-media; +Cc: Clangers

I've been waiting for a working version of DVB-S2 capable tools and utilities to appear in a stable release of Mint\x10, but  it hasn't happened yet, so I decided to build the latest stable v4l-utils from source.

I built v4l-utils version 1.18.0 on Linux Mint 18.3

the compilation process appeared to run through OK with only 9 warnings (see below), but the resulting executables fail due to a lib ref issue.
configure: WARNING: doxygen not found - will not generate any doxygen documentation
configure: WARNING: libelf library not available
configure: WARNING: Qt5 or higher is not available
configure: WARNING: ALSA library not available
  CC       control/libv4lconvert_la-libv4lcontrol.lo
control/libv4lcontrol.c: In function ‘v4lcontrol_create’:
control/libv4lcontrol.c:728:3: warning: ignoring return value of ‘ftruncate’, declared with attribute warn_unused_result [-Wunused-result]
   ftruncate(shm_fd, V4LCONTROL_SHM_SIZE);
   ^
libtool: warning: relinking 'libv4l2.la'
libtool: warning: relinking 'v4l2convert.la'
libtool: warning: relinking 'libv4l1.la'
libtool: warning: relinking 'v4l1compat.la'

Most of these look insignificant but the fifth one looks a bit worrying.

End result :-

stupiduser@somehost ~ $ gcc --version
gcc (Ubuntu 5.4.0-6ubuntu1~16.04.11) 5.4.0 2016060

stupiduser@somehost ~ $ dvbv5-scan -V
dvbv5-scan version 1.18.0

stupiduser@somehost ~ $ dvbv5-scan /usr/share/dvb/dvb-s/Astra-28.2E
dvbv5-scan: symbol lookup error: dvbv5-scan: undefined symbol: dvb_dev_alloc

stupiduser@somehost ~ $ dvb-fe-tool -m -a0 
dvb-fe-tool: symbol lookup error: dvb-fe-tool: undefined symbol: dvb_dev_alloc

- - - - - - - - 

I've appended a bunch of links that refer to C versus C++ declarations.

Is it really necessary for me "a user" to change all the source code references to the suggested form just to get it work. 
Surely there must be a stupid mistake that I've made instead.



Refs to the compiler declaration issues:

https://stackoverflow.com/questions/53322164/linking-shared-library-libdvbv5-undefined-reference

https://stackoverflow.com/questions/18877437/undefined-reference-to-errors-when-linking-static-c-library-with-c-code

https://stackoverflow.com/questions/1041866/what-is-the-effect-of-extern-c-in-c/1041880#1041880

https://github.com/gjasny/v4l-utils/blob/master/lib/libdvbv5/dvb-fe.c




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2019-10-12 17:28 v4l-utils undefined symbol: dvb_dev_alloc _ _ _ _ _
2019-10-12 18:02 ` Mauro Carvalho Chehab
2019-10-12 18:47   ` _ _ _ _ _
2019-10-13 18:45   ` _ _ _ _ _

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