Page 1 of 1
Linker error
Posted: Sun Jan 26, 2014 9:50 pm
by User_Russian
When you compile this code in PB 5.11 x64
Code: Select all
#NCCS = 32
#TCSANOW = 0
Structure termios Align #PB_Structure_AlignC
c_iflag.l
c_oflag.l
c_cflag.l
c_lflag.l
c_line.a
c_cc.a[#NCCS]
c_ispeed.l
c_ospeed.l
EndStructure
ProcedureDLL xx()
PortID = 0 ;SerialPortID(Port)
If tcgetattr_(PortID, @options) = 0 ; читает параметры порта.
If cfsetispeed_(@options, Sp) = 0 ; установка скорости порта.
If cfsetospeed_(@options, Sp) = 0 ; установка скорости порта.
If tcsetattr_(PortID, #TCSANOW, @options) = 0
Result=#True
EndIf
EndIf
EndIf
EndIf
EndProcedure
linker an error occurs.
The problem only occurs when creating so-library. Use Linux Mint 16 x64.
This command does not work.
How to fix the problem?
Re: Linker error
Posted: Sun Jan 26, 2014 11:43 pm
by idle
The problem is with the the version of libc the function is resolving to. It hasn't been compiled with -FPic
so it can't be included into a shared object.
I had no problems compiling it on ubuntu 12.04 x64
Re: Linker error
Posted: Mon Jan 27, 2014 2:25 pm
by User_Russian
idle wrote:The problem is with the the version of libc the function is resolving to. It hasn't been compiled with -FPic
so it can't be included into a shared object.
This is a problem with the OS library, or PB-Library?
If with OS-library, why not have this error when compiling in PB 5.2x?
If with PB-library, then why not this error when compiling function OpenSerialPort(), in which there is a code from the first post of this topic?
idle wrote:I had no problems compiling it on ubuntu 12.04 x64
You used PB 5.11 or PB 5.2x?
In PB 5.2x compiles without errors,
but there is a bug, because of which does not work do not one, SO-library are compiled in PB 5.2x.
Re: Linker error
Posted: Mon Jan 27, 2014 10:42 pm
by idle
I'm using PB 5.21 LTS x64 on ubuntu 12.04
the error is telling you that the function is in a library that doesn't support relocatable code
so it can't be used in a shared object only in the executable.
Though I'm a bit confused why it's says the symbol is undefined.
The problem is with the OS library not PB but the gcc errors don't always report the library
that's causing the immediate problem either.
maybe you're missing a dev version of a library.
Re: Linker error
Posted: Tue Jan 28, 2014 8:51 am
by User_Russian
idle wrote:maybe you're missing a dev version of a library.
Installed only libgtk2-dev.
Need more libraries to compile this code?
The strange thing is that OpenSerialPort() uses the function tcsetattr_() and it does not cause problems when compiling SO-library.
Re: Linker error
Posted: Tue Jan 28, 2014 10:14 am
by User_Russian
Tried to load the functions from libdl.so.2. When compiling standard program - works, but when compiling SO-library can not open "libdl.so.2".
Code: Select all
#NCCS = 32
#TCSANOW = 0
Structure termios Align #PB_Structure_AlignC
c_iflag.l
c_oflag.l
c_cflag.l
c_lflag.l
c_line.a
c_cc.a[#NCCS]
c_ispeed.l
c_ospeed.l
EndStructure
Prototype tcgetattr(x, y)
Prototype cfsetispeed(x, y)
Prototype cfsetospeed(x, y)
Prototype tcsetattr(x, y, z)
ProcedureDLL xx()
Result = 0
Static tcgetattr.tcgetattr
Static cfsetispeed.cfsetispeed
Static cfsetospeed.cfsetospeed
Static tcsetattr.tcsetattr
Protected options.termios, Sp
If IsLibrary(4)=0
Result =1
If OpenLibrary(4, "libdl.so.2")
Result =2
tcgetattr= GetFunction(4, "tcgetattr")
cfsetispeed= GetFunction(4, "cfsetispeed")
cfsetospeed=GetFunction(4, "cfsetospeed")
tcsetattr= GetFunction(4, "tcsetattr")
EndIf
EndIf
If IsLibrary(4) And tcgetattr And cfsetispeed And cfsetospeed And tcsetattr
Result =3
x=OpenSerialPort(0, "/dev/ttyS0", 9600, #PB_SerialPort_NoParity, 8, 1, #PB_SerialPort_NoHandshake, 1024, 1024)
If x=0
Result =4
ProcedureReturn Result
EndIf
PortID = SerialPortID(0)
Result =5
options.termios
Sp=4098
If tcgetattr(PortID, @options) = 0 ; ÷èòàåò ïàðàìåòðû ïîðòà.
Result =7
If cfsetispeed(@options, Sp) = 0 ; óñòàíîâêà ñêîðîñòè ïîðòà.
Result =8
If cfsetospeed(@options, Sp) = 0 ; óñòàíîâêà ñêîðîñòè ïîðòà.
Result =9
If tcsetattr(PortID, #TCSANOW, @options) = 0
Result=10
EndIf
EndIf
EndIf
EndIf
EndIf
ProcedureReturn Result
EndProcedure
; MessageRequester("", Str(xx()))
; xx()
Re: Linker error
Posted: Tue Jan 28, 2014 8:46 pm
by idle
The functions are from libc which should be found under root/lib/x86_64-linux-gnu
The output is generating the linker request with "-lc"
and adding the Import your self probably won't help
think you need someone with your linux version to help out
Re: Linker error
Posted: Wed Jan 29, 2014 3:42 pm
by User_Russian
idle wrote:I'm using PB 5.21 LTS x64 on ubuntu 12.04
Need to use PB 5.11.
In PB 5.21 bug where not working SO-library.
In Ubuntu 12.04, the same linker error.
Re: Linker error
Posted: Sat Feb 01, 2014 11:21 pm
by idle
There is no bug that I can see using PB5.21 x64 on ubuntu 12.04
This code compiles to a shared object. Tried ascii and unicode modes
Code: Select all
#NCCS = 32
#TCSANOW = 0
Structure termios Align #PB_Structure_AlignC
c_iflag.l
c_oflag.l
c_cflag.l
c_lflag.l
c_line.a
c_cc.a[#NCCS]
c_ispeed.l
c_ospeed.l
EndStructure
ProcedureCDLL xx()
x=OpenSerialPort(0, "/dev/ttyS0", 9600, #PB_SerialPort_NoParity, 8, 1, #PB_SerialPort_NoHandshake, 1024, 1024)
If x=0
Result =4
ProcedureReturn result
EndIf
PortID = SerialPortID(0)
Result =5
options.termios
Sp=4098
If tcgetattr_(PortID, @options) = 0 ; ÷èòàåò ïàðàìåòðû ïîðòà.
Result =7
If cfsetispeed_(@options, Sp) = 0 ; óñòàíîâêà ñêîðîñòè ïîðòà.
Result =8
If cfsetospeed_(@options, Sp) = 0 ; óñòàíîâêà ñêîðîñòè ïîðòà.
Result =9
If tcsetattr_(PortID, #TCSANOW, @options) = 0
Result=10
EndIf
EndIf
EndIf
EndIf
ProcedureReturn Result
EndProcedure
This loaded the .so and called the function
with the compiler option to create the executable in the source directory
Code: Select all
ImportC "../junk.so"
xx()
EndImport
MessageRequester("", Str(xx()))
Though it didn't open the serial port
Re: Linker error
Posted: Sun Feb 02, 2014 9:44 pm
by User_Russian
Why, then, me do not work SO-libraries created in PB 5.21 x64?
SO-libraries created in PB 5.11 x64 (from the same source code), work without problems.
Tested in distributions, ubuntu 12.04, Mint 16 and OpenMandriva 2013. In the mode Live DVD (Boot from DVD without installation on your computer).