How do I build shared libraries?
Cons FAQVersion 1.2a quick-and-dirty approach, you can use the Program method to build a shared library directly by setting appropriate values for CFLAGS, LINK and LDFLAGS: $slenv = $env->clone(CFLAGS => '-fPIC', LINK => 'gcc', LDFLAGS => '-shared'); Program $slenv "mydll.sl" "file1.o", "file2.o", ...; Try adding the function below to your Construct. Use just like Library. You must do the following to use it: - Set LINK,LDFLAGS, etc. in your slenv environment to include '-shared' as above. - Set SUFSHLIB to '.
Related QuestionsCan I build netCDF with shared libraries?
NetCDF FAQStarting with version 3.6.2, the netCDF can build shared libraries on platforms which support them, but by default netCDF will build static libraries only. To turn on shared libraries, use the --enable-shared option to the netCDF configure script.
Related QuestionsBSDi - ELF FAQ for BSD/OS 4.x, version 1.3To build and install shared libraries using makefiles, you have two choices: you can use BSD/OS's built-in makefile headers, which have rules that are specifically designed for building shared libraries, or you can cook up something by hand. Under this heading, we will discuss the approach with makefile headers; see below for details about building dynamically linked shared libraries without the makefile headers, and further below for details about statically linked shared libraries.Related Questions
How do I build statically linked shared libraries?
BSDi - ELF FAQ for BSD/OS 4.x, version 1.3Although statically linked shared libraries are now ELF files, the procedure for building them by hand has remained the same since BSD/OS 3.x. Alas, it's still an arcane process... The most important part of creating a statically linked shared library is to create a record for the shared library in the /etc/shlib.map file (or a private shlib.map file). The shlib.
Related QuestionsCan I build a Shared Library?
LessTif Frequently Asked QuestionsWe use libtool for keeping the complexities of building and installing shared libraries out of LessTif. Therefore, if LessTif doesn't build a working shared library on some platform, you may want to check whether libtool already supports this platform. Contact the libtool mailing list if you're interested in details about the platforms supported by libtool. http://www.opengroup.org/onlinepubs/7908799/xsh/limits.h.htmlA link to libtool homepage is on our links page.
Related QuestionsSee section How do I build shared libraries with g++?
Frequently asked questions about the GNU C++ compilerThe GNU linker has not been ported to as many platforms as g++ has, so you may be forced to use collect. If you use collect, you don't need to get something extra and figure out how to install it; the standard gcc installation procedure will do it for you. I used to say at this point that I don't see a clear win for either linking alternative, but with all the improvements in the GNU linker I think that it is now the better choice. Take your pick.
Related QuestionsHow do I build programs with statically linked shared libraries?
BSDi - ELF FAQ for BSD/OS 4.x, version 1.3Use the shlicc program (or shlicc++ for C++ programs). The answer to this question hasn't changed since BSD/OS 3.x, but since we now support two kinds of shared libraries, dynamically linked and statically linked, it's useful to point out that the old shared library tools are still available. The shlicc program creates ELF files instead of a.out files in BSD/OS 4.x, but it uses the same techniques for linking and loading shared libraries as before.
Related QuestionsHow do I build dynamically linked shared libraries by hand?
BSDi - ELF FAQ for BSD/OS 4.x, version 1.3If you don't want to use BSD/OS's make header feature (see above), or if you have other issues such as a complex pre-existing makefile, then you will have to create your shared libraries 'by hand'. Here are the essential steps: All of your C and C++ source needs to be compiled with -fPIC. Often this is just a matter of inserting that string into your makefile's CFLAGS variable. After all of the source code has been compiled, you need to link the objects into a shared object or shared library.
Related Questionsedit] Can I build both shared and static libraries with one ADD_LIBRARY command?
CMake FAQ - KitwarePublicNo. Each library you build must have a unique target name, i.e. the "libname" field of the ADD_LIBRARY command. That way, CMake can track dependencies separately for each library. Libraries can have the same OUTPUT_NAME, see the SET_TARGET_PROPERTIES command, but this is not the default. edit] That means I have to build all my library objects twice, once for shared and once for static. I don't like that! In practice, most libraries have different defines and compiler flags for the shared vs.
Related QuestionsHow do I build binaries that don't use shared libraries at all?
BSDi - ELF FAQ for BSD/OS 4.x, version 1.3The cc(1) and ld(1) programs use a new flag -static to indicate that a program should not be linked with dynamically linked shared libraries. The shlicc(1) program explicitly builds ELF programs with statically linked shared libraries, but it also respects the -static flag.
Related QuestionsCan I build both shared and static libraries with one ADD_LIBRARY command?
CMake FAQ - KitwarePublicThat means I have to build all my library objects twice, once for shared and once for static. I don't like that!
Related QuestionsWhat are shared libraries for?
Porting and ProgrammingConsult Advanced Programming in the Unix Environment by W. Richard Stevens. Chapter 7.7 -- Shared Libraries.
Related QuestionsNetCDF FAQShared libraries are libraries which can be shared by multiple running applications at the same time. This may improve performance. For example, if I have a library which provides function foo(), and I have two applications which call foo(), then with a shared library, only one copy of the foo() function will be loaded into RAM, and both programs will use it. With static libraries, each application would have it's own copy of the foo() function.Related Questions
What is the deal with shared libraries?
Cernlib on Debian FAQCERN does not support building shared (dynamic) libraries from Cernlib, only static ones. However, shared libraries are very nice for the reasons mentioned in question 1.2, so the Debian source has been patched to create them. As an added benefit, this makes for much smaller binaries.
Related QuestionsHow do I link to the PETSc shared libraries?
PETSc: Docs: FAQBy default, the compiler should pick up the shared libraries instead of the regular ones. Nothing special should be done for this.
Related QuestionsWhy is there an error loading shared libraries?
FUSEWiki - FAQIf you get the following error when starting a FUSE-based filesystem: foofs: error while loading shared libraries: libfuse.so.2: cannot open shared object file: No such file or directory check /etc/ld.so.conf for a line containing '/usr/local/lib'. If it's missing, add it, and run ldconfig afterwards.
Related Questionsthe libraries. Why?
news.answers/apple2/GNO-faqA#11.7: Just because a function is declared, that doesn't necessarily mean that it's been implemented. However, it is useful to keep those declarations in the system header files. Not only does it minimize namespace conflicts with user code (application programmers are less likely to use function names that conflict with system header files), but it ensures that the interface is defined for anyone who wishes to contribute an implementation.
Related QuestionsHow can I find out what other libraries own?
Library IMC FAQsGo into HTC's Online Catalog (from the library main page, click on Find Books or Other Materials. Then click on HTC's Online Catalog) At the top of the screen, you will find that the library choice is set at Hennepin Tech Lib. Click on the arrow to the right of the Select a Library Catalog box, and drag down to highlight All MnPALS Libraries. Type your search request into the search box.
Related QuestionsHow do I use netCDF shared libraries?
NetCDF FAQWith netCDF version 3.6.2, shared libraries can be built on platforms which support them by using the --enable-shared argument to netCDF configure script. Users of earlier versions of netCDF can build shared libraries by setting flags correctly during builds. When you use a static library, the code is copied from the library into your program when the program is built. The library is only needed at build time.
Related QuestionsHow do I create shared libraries?
Support - Frequently Asked Questions - The ACE ORBShared libraries on VxWorks aren't really shared libraries. If you ever worked on Unix in the days before shared libraries, you might remember "relocatable object files", i.e., object files created by the linker with many of their symbols resolved, but also permitted to have unresolved symbols. When you see libACE.so on VxWorks, they're simply relocatable object files. Once you realize that, and all it entails, your life will get easier :-) You should not use "-lACE" when linking libTAO.
Related QuestionsCan I debug dynamically linked shared libraries?
BSDi - ELF FAQ for BSD/OS 4.x, version 1.3Gdb can almost always handle code and data in shared libraries and shared objects. We have experienced a few odd situations in which gdb gets confused about the number of breakpoints that it needs to look for when loading a shared object with dlopen(3). When this bug crops up, you can normally work around it by interrupting the program and running it again under gdb. For example: $ gdb program [...] (gdb) run [... program calls dlopen(3) ...] [... program hangs ..
Related QuestionsHow do I install statically linked shared libraries?
BSDi - ELF FAQ for BSD/OS 4.x, version 1.3in earlier versions of BSD/OS, the mkshlib command links and installs statically linked shared libraries. It works by parsing the shlib.map file and creating an appropriate shlib command, which it prints and executes. The shlib program does the hard work of laying out the shared library, building the jump tables, linking it and installing it along with the 'stub' library.
Related QuestionsWhat are the advantages of statically linked shared libraries?
BSDi - ELF FAQ for BSD/OS 4.x, version 1.3Simplicity. Statically linked shared libraries are pretty simple structures. There's nothing to go wrong with relocations, symbol binding, path lookups, etc. at run time. That is the one debugging advantage that they hold over dynamically linked shared libraries. Speed.
Related QuestionsWhy doesn't GHC use shared libraries?
GHC/FAQ - HaskellWikiGHC does provide shared libraries, currently only on MacOS X. We are working on making shared libraries work on other platforms. However, GHC-compiled libraries are very tightly coupled, which means it's unlikely you'd be able to swap out a shared library for a newer version unless it was compiled with exactly the same compiler and set of libraries as the old version.
Related QuestionsWhy is the County planning to build more libraries?
WakeGOV.com - Frequently Asked QuestionsThe Wake County Public Library System's two bookmobiles and 19 libraries, which include six regional facilities, are being stretched to their limits to deal with citizen demand in a County that adds more than 35,000 people every year (on average, 98 people per day). Wake's system is one of the most heavily used in the state, circulating more than 9.2 million books annually and providing more than 5,000 youth and adult programs each year.
Related QuestionsHow was the decision made to build more libraries?
WakeGOV.com - Frequently Asked QuestionsWake County Public Libraries are guided by a long-term business plan. The most recent version of this Master Plan was completely rewritten and presented to the Board of Commissioners on June 4, 2007. Wake County has been building libraries since the mid-1980s. Many of these facilities are in need of renovation. Therefore, in addition to providing for new libraries in high growth areas, the Master Plan outlines renovations and expansions of existing facilities.
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