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snopt / snopt-interface

C/C++ API for SNOPT7
MIT License
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C++ library not linking - or not generated properly #3

Closed javieralonso closed 7 years ago

javieralonso commented 9 years ago

Good day,

We have a full distribution of SNOPT and I managed to make it - following the instructions here:

./configure --with-c-cpp make make install

That creates a library snopt_cpp but when I make the example sntoya.cc I get a bounch of errors such as: sntoya.cc:(.text+0x516): undefined reference to `snoptProblem::setProblemSize(int, int)'

I also looked at the instructions here: https://ccom.ucsd.edu/~optimizers/compile.html#c-cpp But, there is no folder $SNOPT/interfaces and make interface does not exist.

I now found this repository, but I do not see how to create the library from it. May I ask for some guidance with this issue?

Note, until now I had been using a precompiled snopt7_cpp library, but I now hit the 300 constraints limit.

Thank you for your help. Javier

gnowzil commented 9 years ago

Hi Javier, Sounds like you have an old version of SNOPT. The C/C++ interface is relatively new and the instructions on the website are for this new version. If you download the files in this repository, you just do:

./configure --with-snopt=/path/to/snopt
make; make install
make examples

This will compile the library and examples. The Fortran SNOPT library has to be compiled separately.

javieralonso commented 9 years ago

Thank you for the prompt reply!

I get an error: ./configure --with-snopt=.. bash: ./configure: No such file or directory

And, path/to/snopt is to the snopt folder or the lib folder?

gnowzil commented 9 years ago

The path is to the lib folder.

To do the configure, you have to be in the top directory of the C/C++ interface package.

javieralonso commented 9 years ago

Sorry, maybe I am missing something, but I believe I am in the top directectory of the interface package:

jalonso@ubuntu:~/software/snopt7/snopt-interface-master$ ls aclocal.m4 cexamples configure.ac include Makefile.in src autogen.sh config cppexamples LICENSE README.md

jalonso@ubuntu:~/software/snopt7/snopt-interface-master$ ./configure --with-snopt=../lib bash: ./configure: No such file or directory

gnowzil commented 9 years ago

Oh yeah. Sorry I forget the configure script needs to be created.

libtoolize -c; autoconf

should do it. And then you can do the configure.

javieralonso commented 9 years ago

Thanks - that run smoothly until "make examples", where I get a lot of errors such as: sn30spec.f:(.text+0x1227): undefined reference to snread_' sn37wrap.f:(.text+0xdb32): undefined reference todcopy_'

Note, first it could not find the library snopt7, because the one I am getting after compiling SNOPT is named snopt, I renamed it adding the 7.

gnowzil commented 9 years ago

Thanks - that run smoothly until "make examples", where I get a lot of errors such as: sn30spec.f:(.text+0x1227): undefined reference to snread' sn37wrap.f:(.text+0xdb32): undefined reference todcopy'

It needs a blas library to link with. I just fixed the configure to add the blas option.

./configure --with-snopt=/path/to/snopt  --with-blas=/path/to/blas

Note, first it could not find the library snopt7, because the one I am getting after compiling SNOPT is named snopt, I renamed it adding the 7.

New versions of SNOPT create a library called snopt7.

javieralonso commented 9 years ago

Thank you Elizabeth for your help.

I updated the code, installed blas and configured the interface with it: ./configure --with-snopt=../lib --with-blas=/usr/lib/

But, when running $make examples I get the error: jalonso@ubuntu:~/software/snopt7/snopt-interface-master$ make examples if [ ! -d ./mod ]; then mkdir ./mod; fi if [ ! -d ./cexamples ]; then mkdir ./cexamples; fi /bin/bash ./libtool --mode=link --tag=CC --quiet gcc cexamples/toyB.lo -o cexamples/toyB -L/home/jalonso/software/snopt7/snopt-interface-master/lib -lsnopt7_c -L../lib -lsnopt7 /usr/lib/ -L/usr/lib/gcc/x86_64-linux-gnu/4.8 -L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib -L/lib/x86_64-linux-gnu -L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../.. -lgfortran -lm -lquadmath /usr/bin/ld: cannot find /usr/lib/: File format not recognized

gnowzil commented 9 years ago

Give it the actual blas library. This is different depending on system or user preferences so it has to be explicitly given.

Examples:

./configure --with-snopt=../lib --with-blas="-framework Accelerate"
./configure --with-snopt=../lib --with-blas="-L/usr/lib -lblas"
./configure --with-snopt=../lib --with-blas="-lblas"
./configure --with-snopt=../lib --with-blas="-lopenblas"
javieralonso commented 9 years ago

Thank you. One step closer. Now I get: sn30spec.f:(.text+0x1227): undefined reference to snread_' sn30spec.f:(.text+0x13be): undefined reference tosnprnt_'

gnowzil commented 9 years ago

You're using an old version of SNOPT that splits up the libraries.

To make this interface work, you'll have to edit the Makefile. Look for the line with "-lsnopt7" and change it to "-lsnopt7 -lsnprnt -lsnblas". I believe those are the names of the old SNOPT libraries, but they might be different -- check the lib directory in SNOPT. Also snblas may not be needed if you are using a 3rd party blas library (although I'm not sure this is possible in old versions of SNOPT).

javieralonso commented 9 years ago

Thank you, I could now make the examples, but they throw errors when I run them. See below. I am guessing because our version of SNOPT7 is too old?

jalonso@ubuntu:~/software/snopt7/snopt-interface-master/cppexamples$ ./sntoya2 At line 90 of file src/sn03prnt.f Fortran runtime error: Unit number in I/O statement too large

jalonso@ubuntu:~/software/snopt7/snopt-interface-master/cppexamples$ ./sntoya * Error in `./sntoya': double free or corruption (!prev): 0x00000000014bdf30 * Aborted (core dumped)

jalonso@ubuntu:~/software/snopt7/snopt-interface-master/cppexamples$ ./sntoyB SNSPEC EXIT 80 -- insufficient storage allocated SNSPEC INFO 81 -- work arrays must have at least 500 elements Warning: unable to find specs file sntoy.spc sntoyB: src/snoptProblem.cpp:216: int snoptProblem::setIntParameter(const char*, int): Assertion `initCalled == 1' failed. Aborted (core dumped)

beesor commented 8 years ago

I was wondering if there was any solution to @javieralonso last post regarding a Fortran runtime error from sn03prnt.f.

I was able to successfully build snopt 7.4 on OSX 10.9. I can build the c++ examples, but for each get the same runtime error:

At line 94 of file src/sn03prnt.f (unit = 32767) Fortran runtime error: Unit number in I/O statement too large

This is regardless of building/running in Xcode or via command line. Any help would be appreciated. Thank you.

A followup:

gnowzil commented 8 years ago

Hi @beesor, yeah usually when you get errors like "Unit number in I/O statement too large", it's a 32 vs 64 bit issue. To use the C/C++ interface, you have to stick with 32 so don't use --with-64.

TommasoPino commented 7 years ago

Hello everyone, I have a similar problem and thanks to this post I have partially resolved this problem (my version of snopt is older than actual. But I suppose the same of this post, I have the library split in libsnopt.a libblas.a libsnprint.a). 

./configure --with-snopt=/path/to/snopt`
make; make install
make examples

these instruction works fine with out error or any warning. But when I tried to execute the cppexample ./sntoya it produce the error as follow:

dyld: Symbol not found: _snlog2_
  Referenced from: /Users/tommasopino/Downloads/snopt-interface-master/lib/libsnopt7_cpp.dylib
  Expected in: flat namespace
 in /Users/tommasopino/Downloads/snopt-interface-master/lib/libsnopt7_cpp.dylib
Abort trap: 6

What did I wrong? Thanks Tommaso