cmake: Tell CMake that our Fortran sources are in fixed format

CMake will automatically generate the proper flag to tell each compiler
that our sources use fixed format.  Drop our manual use of `-qfixed` for
the XL Fortran compiler because it breaks CMake's FortranCInterface
detection (which uses free-format sources).

Author: bradking

CMAKE/CheckLAPACKCompilerFlags.cmake

@@ -44,12 +44,6 @@ elseif( (CMAKE_Fortran_COMPILER_ID STREQUAL "VisualAge" ) OR  # CMake 2.6
     set( FPE_EXIT TRUE )
   endif()
 
-  if( NOT ("${CMAKE_Fortran_FLAGS}" MATCHES "-qfixed") )
-    message( STATUS "Enabling fixed format F90/F95 with -qfixed" )
-    set( CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -qfixed"
-         CACHE STRING "Flags for Fortran compiler." FORCE )
-  endif()
-
 # HP Fortran
 elseif( CMAKE_Fortran_COMPILER_ID STREQUAL "HP" )
   if( "${CMAKE_Fortran_FLAGS}" MATCHES "\\+fp_exception" )

CMakeLists.txt

@@ -16,6 +16,9 @@ set(CMAKE_MODULE_PATH "${LAPACK_SOURCE_DIR}/CMAKE" ${CMAKE_MODULE_PATH})
 # Export all symbols on Windows when building shared libraries
 SET(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE)
 
+# Tell CMake that our Fortran sources are written in fixed format.
+set(CMAKE_Fortran_FORMAT FIXED)
+
 # Set a default build type if none was specified
 if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
   message(STATUS "Setting build type to 'Release' as none was specified.")