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Top Forums Programming Issues with two versions of libstdC++.so Post 302889060 by Praveen_218 on Tuesday 18th of February 2014 01:55:21 PM
Old 02-18-2014
Issues with two versions of libstdC++.so

I'm facing an issue in which my program is using a custom library (say, libxyz.so) which is compiled using libstdc++.so.5 and the system I'm using this library to create an executable from my program, has libstdc++so.6 as well as libstdc++.so.5; both available under /usr/lib directory.

There are multiple compilers available with the system (i.e gcc, g++34 and g++ version 4.*, IBM xlc).

When I compile my program, the resultant binary has to link libxyz.so (which has libstdc++.so.5 already) and based on further symbols need, it has to use libstdc++.so, but it by default links with libstdc++.so.6 and these two versions of libstdc++ gets its way into my executable.

This clearly shows up the cross links when done ldd on my executable. The program crashes when run. Because some classes are not compatible in libstdc++.so between versions 5 and 6.

Being C++ program, still I compiled and linked with gcc itself which is by default linking only with libstdc++.so.5 but had to use -fno-use-cxa_exception_ptr as flag to suppress the undefined reference issue on exception handling code. This made my binary having uniform links with libstdc++.so.5 through out and the program runs well. But this is just a work around and not an acceptable solution.

Is there a way, in which we can make g++ (or even g++34) to link explicitly with a particular library version overriding the default behavior to link with the latest version?

In that case I would prefer to link with libstdc++.so.5 through out.

Thanks a lot in advance for your suggestions / insight and for your precious time of course.

Regards,
PraveenK

---------- Post updated at 12:25 AM ---------- Previous update was at 12:05 AM ----------

It would also be great, if you suggest on editing the gcc/g++ compile specs. However that again is not a very open option if this is not an user account specific changes. Although I have the root access but would not be allowed to make system configuration changes.

Last edited by Praveen_218; 02-18-2014 at 02:50 PM.. Reason: Typo errors.
 

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sdl-config(1)						      General Commands Manual						     sdl-config(1)

NAME
sdl-config - script to get information about the installed version of SDL SYNOPSIS
sdl-config [ --prefix= DIR] [ --exec-prefix= DIR] [ --version ] [ --libs | --library-libs | --plugin-libs ] [ --cflags ] DESCRIPTION
sdl-config is a tool that is used to configure and determine the compiler and linker flags that should be used to compile and link pro- grams, libraries, and plugins that use SDL. It is also used internally by the m4 macros that are included with SDL. OPTIONS
--cflags Print the compiler flags that are necessary to compile a program or library that uses SDL. --exec-prefix=DIR If specified, use DIR instead of the installation exec prefix that SDL was build with when computing the output for the --cflags, --libs, --library-libs, and --plugin-libs options. This option must be specified before any of the --cflags, --libs, --library- libs, and --plugin-libs options. --libs Print the linker flags that are necessary to link a program that uses SDL. --static-libs Print the linker flags that are necessary to statically link a program that uses SDL. --library-libs Print the linker flags that are necessary to link a library that uses SDL. (This excludes any static objects required for linking, since these must be linked only by executable programs.) --plugin-libs Print the linker flags that are necessary to link an SDL-using object that is to be accessed via dlopen(3). This may include static objects with PIC symbol information. This option should not be used for ordinary shared libraries or standalone applications. --prefix=DIR If specified, use PREFIX instead of the installation prefix that SDL was built with when computing the output for the --cflags, --libs, --library-libs, and --plugin-libs options. This option is also used for the exec prefix if --exec-prefix was not specified. This option must be specified before any of the --cflags, --libs, --library-libs, and --plugin-libs options. --version Prints the currently installed version of SDL on standard output. EXAMPLES
gcc -o main.o $(sdl-config --cflags) main.c is how you might use sdl-config to compile a C source file for an executable program. gcc -o my_app $(sdl-config --libs) main.o util.o is how you might use sdl-config to link compiled objects into an executable program. gcc -o libSDL_nifty-1.2.so.0.0.1 $(sdl --library-libs) read.o write.o munge.o is how you might use sdl-config to link compiled objects into a shared library. gcc -o libnifty_xmms.so $(sdl --plugin-libs) stream.o blit.o deinterlace.o is how you might use sdl-config to link compiled objects into a plugin for use by another program. AUTHOR
The Simple DirectMedia Layer (SDL) library was written by Sam Lantinga. This manual page was written by Branden Robinson, originally for Progeny Linux Systems, Inc., and the Debian Project. SDL 1.2 2001-12-25 sdl-config(1)
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