Compilation instructions for ATLAS with cygwin under Windows 7

First make sure you have the cygwin packages gcc-g77 and 
gcc4-fortran installed.

[ notes in Windows 7 issues ]

 - There are some commands relating to a "manifest" below.  This is a patch to
   the build process for Win7.  The issue is that Windows 7 automatically tries
   to elevate the privelege of anything with "install" or "update" in its title,
   but this does not work from Cygwin. The manifest tells Win7 not to do the
   heuristic privelege elevation.  This has been fixed in the 3.9 versions of
   ATLAS, by renaming the program in question.  These instructions are for 3.8.

 - If you get "vfork: resource temporarily 
   unavailable" at some point during the build, you may have to rerun
   make.  It may have to do with reaching cygwin's maximum number of
   processes.


[end notes on Windows 7 issues]

# get the last stable version of ATLAS library (3.8.3)
cd ../tools
wget http://sourceforge.net/projects/math-atlas/files/Stable/3.8.3/atlas3.8.3.tar.gz/download
tar -xvzf atlas3.8.3.tar.gz

# build the library
cd ATLAS
mkdir cygwin_build
cd cygwin_build

../configure -b 32 --prefix=`pwd`

[note: you may get some errors about "no rule to make target IRunArchInfo_winnt"
 or something like that.  These appear not to be fatal.  I'm not sure if they
 mean that the resulting configure process failed.  If you get errors about
 cannot find g77 or f77 or gfortran, make sure the packages gcc-g77 and
 gcc4-fortran are installed].


# The following is a patch for an interaction with Windows 7.
# It won't hurt if you're not on Windows 7.
mkdir bin
cd bin
cat > xatlas_install.exe.manifest <<EOF
<?xml version="1.0" encoding="utf-8"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
   <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
      <security>
         <requestedPrivileges>
            <requestedExecutionLevel level="asInvoker" />
         </requestedPrivileges>
      </security>
   </trustInfo>
</assembly>
EOF
cd ..
# end patch.

make

# optionally check and benchmark the built library
make check
make time

# create .dll file
mkdir install
# in the next command, got some errors like: 
# cannot access `/home/dpovey/UBM-ASR/branches/v1.0/tools/ATLAS/cygwin_build/install/lib/libptf77blas.a': No such file or directory
# ignoring these for now.
make install DESTDIR=`pwd`/install
cd install
cd lib

echo "EXPORTS" > lib_atlas.def
cat ../include/cblas.h ../include/clapack.h |  \
  perl -ane 'm:(catlas_|cblas_|clapack_)\w+: && print "$&=$&\n";' \
 | sort | uniq >> lib_atlas.def

#gcc-3 -mno-cygwin -shared -o lib_atlas.dll -Wl,--out-implib=lib_atlas.lib \
#    lib_atlas.def \
#    liblapack.a libcblas.a libf77blas.a libatlas.a \
#    -Wl,--enable-auto-import 

gcc-3 -mno-cygwin -shared -o lib_atlas.dll \
    lib_atlas.def \
    liblapack.a libcblas.a libf77blas.a libatlas.a \
    -Wl,--enable-auto-import 

# we have to use VS's lib.exe tool, not gcc, to make lib_atlas.lib,
# or it won't work in release mode.
# see http://groups.google.com/group/gnu.gcc.help/browse_thread/thread/c6840ea01e4d163a?pli=1
# If your path or VS version is not as below, you will have to change the
# command.
"/cygdrive/c/Program Files/Microsoft Visual Studio 10.0/VC/bin/lib.exe" \
  /DEF:lib_atlas.def /MACHINE:ix86 /OUT:lib_atlas.lib


#The output of this process that you will need for Windows are the files
#  [somewhere]/ATLAS/cygwin_build/install/lib/lib_atlas.{lib,dll}