[Ipopt] Building ipopt win64

[FEDERICO PRADES ILLANES]

Hello ipopt'ers,

We are trying to build Ipopt 3.12.6 in windows win32 and win64, using
MinGW(we are using tdm-gcc with gcc/gfortran 5.1).

We were successful building win32 version both Debug and Release versions,
but not so lucky with the win64 version.

The versions of the additional software we use:

- MUMPS 4.10.0
- blas (coinor 20130815)
- Lapack 3.4.2

To build Ipopt, we proceed as follows:

# Load cywin and VS2012
> export CC=cl
> export CXX=cl
> ./configure --disable-shared --enable-static --with-pic
> --enable-doscompile=msvc --enable-dependency-linking
> lt_cv_deplibs_check_method=pass_all --with-blas-lib="$BLAS_HOME/blas.dll"
> --with-lapack-lib="$LAPACK_HOME/liblapack.dll"
> --with-mumps-lib="$MUMPS_HOME/libdmumps.lib $MUMPS_HOME/libmumps_common.lib
> $MUMPS_HOME/libpord.lib $MUMPS_HOME/libmpiseq.lib"
> make -j12 install


Ipopt builds fine win32/win64. And we have a example code to use Ipopt. To
build and link the example, we use the following 32bits libraries:

- $MINGW_ROOT/lib/libmingwex.a
- $MINGW_ROOT/lib/gcc/mingw32/5.1.0/libgfortran.dll.a
- $MINGW_ROOT/lib/gcc/mingw32/5.1.0/libgcc.a

Builds, links and runs nicely on win32. However in win64 we use:

- $MINGW_ROOT/x86_64-w64-mingw32/lib/libmingwex.a
- $MINGW_ROOT/lib/gcc/x86_64-w64-mingw32/5.1.0/libgfortran.dll.a
- $MINGW_ROOT/lib/gcc/x86_64-w64-mingw32/5.1.0/libgcc.a

Here is where the fun starts. We start to get errors like:

libmingwex.lib(lib64_libmingwex_a-powi.o) : error LNK2001: unresolved
> external symbol __mingw_raise_matherr


Looking around in mingw we managed to find the missing symbol, at:

- $MINGW_ROOT\x86_64-w64-mingw32\lib\libmingw32.a

The error then becomes

MSVCRT.lib(gs_report.obj) : error LNK2005: *__report_gsfailure already
> defined* in libmingw32.lib(lib64_libmingw32_a-gs_support.o)
> libmingw32.lib(lib64_libmingw32_a-merr.o) : error LNK2005:* _matherr
> already defined* in MSVCRT.lib(merr.obj)


​Does anybody know ​what are we missing? Or how to solve it?
Does anybody know if it's possible to build ipopt with mingw using
gfortran? Is it documented in detail?

Thanks for your help, and patience to read this far.

*Federico Prades Illanes* - *ext. (2)75682 - Software Evangelist*
*Quantitative and Business Solutions (QBS) **- CIB - **BBVA*

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