We are developing object oriented examples for our next book and have hit a compiler bug with the following short program.
program polymorphic use shape_module use circle_module use rectangle_module implicit none type shape_w class (shape_type) , allocatable :: shape_v end type shape_w type (shape_w) , dimension(3) :: p print *,' shape ' p(1)%shape_v=shape_type(10,20) call p(1)%shape_v%draw() print *,' circle ' p(2)%shape_v=circle_type(100,200,300) call p(2)%shape_v%draw() print *,' rectangle ' p(3)%shape_v=rectangle_type(1000,2000,3000,4000) call p(3)%shape_v%draw() end program polymorphic The following example program compiles and runs. program polymorphic use shape_module use circle_module use rectangle_module implicit none class (shape_type) , allocatable :: p allocate(shape_type :: p) print *,' ** shape **' p=shape_type(10,20) call p%draw() print *,' ** circle **' p=circle_type(100,200,300) call p%draw() print *,' ** rectangle **' p=rectangle_type(1000,2000,3000,4000) call p%draw() end program polymorphic Here is the rest of the information requested in the bug report document. gcc version ----------- c:\document\fortran\newbook\examples\ch32>gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=c:/program files (x86)/gfortran/bin/../libexec/gcc/i586-pc-mingw32/4.6.0/lto-wrapper.exe Target: i586-pc-mingw32 Configured with: ../gcc-trunk/configure --prefix=/mingw --enable-languages=c,fortran --with-gmp=/home/brad/gfortran/dependencies - -disable-werror --enable-threads --disable-nls --build=i586-pc-mingw32 --enable-libgomp --disable-shared --disable-win32-registry --with-dwarf2 --disable-sjlj-exceptions : (reconfigured) ../gcc-trunk/configure --prefix=/mingw --enable-languages=c,fortran --wit h-gmp=/home/brad/gfortran/dependencies --disable-werror --enable-threads --disable-nls --build=i586-pc-mingw32 --enable-libgomp -- disable-shared --disable-win32-registry --with-dwarf2 --disable-sjlj-exceptions Thread model: win32 gcc version 4.6.0 20100524 (experimental) [trunk revision 159774] (GCC) Hardware and Operating system ----------------------------- The information below is from the Intel CPU id utility. ++++++++++++++++++++++++++++++++++++++++++ Intel(R) Processor Identification Utility Version: 4.22.20100224 Time Stamp: 2010/06/08 09:48:20 Operating System: 6.0-6002-Service Pack 2 Number of processors in system: 1 Current processor: #1 Active cores per processor: 4 Disabled cores per processor: 0 Processor Name: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz stuff deleted ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ The system is running Windows Vista Home Premium SP2 - 64 Bit. gcc build options ================= I did not build it I just took the gfortran executable from the download site. Compiler command line ===================== c:\document\fortran\newbook\examples\ch32>gfortran shape_p.f90 circle_p.f90 rectangle_p.f90 polymorph_array.f90 polymorph_array.f90: In function 'polymorphic': polymorph_array.f90:18:0: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. Do you want the shape_p.f90, circle_p.f90 and rectangle_p.f90 source files? -- Summary: polymorphic object oriented example Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: ian at rhymneyconsulting dot co dot uk http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44465
