Mac os x ranlib has no symbols

Right using autoconf building libA. XCode version Version 6. We decided to go with Linux for now so is no longer a pressing issue on this side. But in the future will see if I can get back to send some example code. If yes - it is the reason of the problem, one static library can be included into another only by special command, not as object file. I'll try and reinstall Xcode along with the involved parties Will see if I can get a co worker with a Mac to run the same code. Could you please confirm what you use libtool which is provided by Apple Apple Inc. Not a GNU libtool from Mac ports, brew or any other source.

Apple WWDC 2004 Session 314 - Compile and Link Strategies on Mac OS X

We are able to reproduce this problem using GNU libtool. Our recommendation here is to use libtool which is provided by Apple in XCode. Thanks for tracking it down.

GHC build throws many linker-related issues (macOS, Xcode)

Sorry I didn't get to spend as much time working on helping the hunt as I would have liked. After we decided to go towards the Linux versions this became more of a side project. Typing libtool -V gave the apple version but I'm not sure if this is the same as what autoconf is using?

Posts Tagged ‘ranlib’

I'm certain that at one point before even beginning to work with the IPP libraries I installed the GNU version of libtool and it may be trying to use that. In the future will be sure that it is forced to use the libtool in Apple XCode. Like this:.

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And try to compile your project again, potentially repeating this process until no more symbols are undefined. It may be useful to check that you code compiles with no errors first using the headers-only version to be sure that all errors are from missing template instantiations. Alternatively you can use the autoexplicit.


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Repeat this process until convergence:. Faster compile time : Because the libigl library is already compiled, only the new code in ones project must be compiled and then linked to IGL. This means compile times are generally faster. Thus debugging and editing are near impossible. Compounded dependencies : An immediate disadvantage of this seems to be that even to use a single function e. However, because all dependencies other than Eigen should be encapsulated between ifndef guards e. An archive with such an index speeds up linking to the library and allows routines in the library to call each other without regard to their placement in the archive.

In Linux, ar is the GNU general purpose archiver. With the option c. It creates an archive containing copies of file The archive-name conventionally but not necessarily has the extension.

Each file When the archived files are all object files it is usually the intention to use the archive for delivering that selection of object files into the linkage of programs or DSOs Dynamic Shared Objects. In this case archive-name will also conventionally be given the prefix lib , e. Used as a linker input file, libfoo. This usage is a perpetual source of confusion to inexpert programmers, because it leads them to think that an archive libfoo. In fact a "static library" and a "dynamic library" are not at all similar things and are used in linkage in utterly different ways.


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A conspicuous difference is that a static library is not produced by the linker , but by ar. So no linkage happens, no symbol resolution happens.


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The archived object files are unchanged: they're just put in a bag. When an archive is input in the linkage of something that is produced by the linker - such as a program or DSO - the linker looks in the bag to see if there are any object files in it that provide definitions for unresolved symbol references that have accrued earlier in the linkage. If it finds any, it extracts those object files from the bag and links them into the output file, exactly as if they were named individually in the linker commandline and the archive not mentioned at all. So the entire role of an archive in linkage is as bag of object files from which the linker can select the ones it needs to carry on the linkage.

By default, GNU ar makes its output archives ready for use as linker inputs. It adds a phony "file" to the archive, with a magic phony filename, and in this phony file it writes content that the linker is able to read as a lookup table from the global symbols that are defined by any object files in the archive to the names and positions of those object files in the archive. This lookup table is what enables the linker to look in the archive and identify any object files that define any unresolved symbol references it has got in hand.

And if you invoke ar to create or update an archive that hasn't got an uptodate symbol table for any reason, then you can give it one with the s option. In Linux, ranlib is a legacy program that adds an uptodate symbol table to an ar archive if it doesn't have one. It's effect is exactly the same as ar s , with GNU ar. Historically, before ar was equipped to generate a symbol table itself, ranlib was the kludge that injected the magic phony file into an archive to enable the linker to pick object files out of it.

CEF Forum • compiler error using cmake

Your example:. By itself, ar qc libgraphics. This illustrates the fairly rare use of the linker , ld , to produce a merged object file by linking multiple input files into a single output object file, in which symbol resolution has been done as far as is possible , given the input files.