I tryied to use arpack++ under cygwin32 after compiling arpack, lapack, umfpack, superlu without problems. Most of test examples of arpack++ are working but this is not and I need this utility Complex generalized eigenvalue problem. the system answer internal compiler error. I didn't find problem using arpack++ whith linux-gcc-2.95.2 and linux-gcc-3.0.1. REPORT: 1)the exact version of GCC: $ gcc -v Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/2.95.3-5/specs gcc version 2.95.3-5 (cygwin special) ---------------------------------------------------------------------------------------- 2)the system type HP vectra PII266 192MB RAM, cygwin 1.3.5, winnt4.0 ---------------------------------------------------------------------------------------- 3)the options given when GCC was configured/built: -g -O -Wall ---------------------------------------------------------------------------------------- 4 and 5)the complete command line that triggers the bug and the compiler output (error messages, warnings, etc.): Administrator@NTGIORGIO ~/arpack++/examples/product/complex $ make compgreg g++ -g -Dlinux -I/cygdrive/d/users/administrator/arpack++/include -I/usr/local/include/g++-3 -I/cygdrive/d/users/adminis trator/arpack++/examples/matprod -I/cygdrive/d/users/administrator/arpack++/examples/matprod/complex -c compgreg.cc /cygdrive/d/users/administrator/arpack++/include/arrseig.h: In method `void ARrcStdEig >::Copy(co nst ARrcStdEig > &)': /cygdrive/d/users/administrator/arpack++/include/arseig.h:123: instantiated from `ARStdEig,Comp lexGenProblemA >::Copy(const ARStdEig,ComplexGenProblemA > &)' compgsol.h:69: instantiated from here /cygdrive/d/users/administrator/arpack++/include/arrseig.h:797: Internal compiler error. /cygdrive/d/users/administrator/arpack++/include/arrseig.h:797: Please submit a full bug report. /cygdrive/d/users/administrator/arpack++/include/arrseig.h:797: See for instructions. make: *** [compgreg.o] Error 1 Administrator@NTGIORGIO ~/arpack++/examples/product/complex $ ---------------------------------------------------------------------------------------- 5)the preprocessed file (*.i*) that triggers the bug, generated by adding -save-temps to the complete compilation command: Administrator@NTGIORGIO ~/arpack++/examples/product/complex $ make compgreg g++ -g -v -save-temps -Dlinux -I/cygdrive/d/users/administrator/arpack++/include -I/usr/local/include/g++-3 -I/cygdrive /d/users/administrator/arpack++/examples/matprod -I/cygdrive/d/users/administrator/arpack++/examples/matprod/complex -c compgreg.cc Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/2.95.3-5/specs gcc version 2.95.3-5 (cygwin special) /usr/lib/gcc-lib/i686-pc-cygwin/2.95.3-5/cpp0.exe -lang-c++ -v -I/cygdrive/d/users/administrator/arpack++/include -I/us r/local/include/g++-3 -I/cygdrive/d/users/administrator/arpack++/examples/matprod -I/cygdrive/d/users/administrator/arpa ck++/examples/matprod/complex -D__GNUC__=2 -D__GNUG__=2 -D__GNUC_MINOR__=95 -D__cplusplus -D_X86_=1 -D_X86_=1 -Asystem(w innt) -D__EXCEPTIONS -g -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -Di686 -Dpentiumpro -D__i686 -D__i686__ - D__pentiumpro -D__pentiumpro__ -D__stdcall=__attribute__((__stdcall__)) -D__cdecl=__attribute__((__cdecl__)) -D_stdcall= __attribute__((__stdcall__)) -D_cdecl=__attribute__((__cdecl__)) -D__declspec(x)=__attribute__((x)) -D__CYGWIN32__ -D__C YGWIN__ -Dunix -D__unix__ -D__unix -isystem /usr/local/include -idirafter /usr/include -idirafter /usr/include/w32api -i system /usr/include/g++-3 -isystem /usr/include/g++ -Dlinux compgreg.cc compgreg.ii GNU CPP version 2.95.3-5 (cygwin special) (80386, BSD syntax) #include "..." search starts here: #include <...> search starts here: /cygdrive/d/users/administrator/arpack++/include /cygdrive/d/users/administrator/arpack++/examples/matprod /cygdrive/d/users/administrator/arpack++/examples/matprod/complex /usr/include/g++-3 /usr/lib/gcc-lib/i686-pc-cygwin/2.95.3-5/include /usr/include /usr/include/w32api End of search list. The following default directories have been omitted from the search path: End of omitted list. /usr/lib/gcc-lib/i686-pc-cygwin/2.95.3-5/cc1plus.exe compgreg.ii -quiet -dumpbase compgreg.cc -g -version -o compgreg.s GNU C++ version 2.95.3-5 (cygwin special) (i686-pc-cygwin) compiled by GNU C version 2.95.3-5 (cygwin special). /cygdrive/d/users/administrator/arpack++/include/arrseig.h: In method `void ARrcStdEig >::Copy(co nst ARrcStdEig > &)': /cygdrive/d/users/administrator/arpack++/include/arseig.h:123: instantiated from `ARStdEig,Comp lexGenProblemA >::Copy(const ARStdEig,ComplexGenProblemA > &)' compgsol.h:69: instantiated from here /cygdrive/d/users/administrator/arpack++/include/arrseig.h:797: Internal compiler error. /cygdrive/d/users/administrator/arpack++/include/arrseig.h:797: Please submit a full bug report. /cygdrive/d/users/administrator/arpack++/include/arrseig.h:797: See for instructions. make: *** [compgreg.o] Error 1 Administrator@NTGIORGIO ~/arpack++/examples/product/complex $ THANKS A LOT, GUIDO LOMBARDI