Add support for the g95 Fortran compiler

This commit teaches CMake about the g95 compiler from

  http://www.g95.org

We use 'G95' as the compiler id string, and add some basic flags.

See issue #9241.

Modules/CMakeFortranCompilerId.F.in

@@ -6,6 +6,8 @@
         PRINT *, 'INFO:compiler[Intel]'
 #elif defined(__SUNPRO_F90) || defined(__SUNPRO_F95)
         PRINT *, 'INFO:compiler[SunPro]'
+#elif defined(__G95__)
+        PRINT *, 'INFO:compiler[G95]'
 #elif defined(__GNUC__)
         PRINT *, 'INFO:compiler[GNU]'
 #elif defined(__IBMC__)

Modules/Compiler/G95-Fortran.cmake

@@ -0,0 +1,7 @@
+set(CMAKE_Fortran_FLAGS_INIT "")
+set(CMAKE_Fortran_FLAGS_DEBUG_INIT "-g")
+set(CMAKE_Fortran_FLAGS_MINSIZEREL_INIT "-Os")
+set(CMAKE_Fortran_FLAGS_RELEASE_INIT "-O3")
+set(CMAKE_Fortran_FLAGS_RELWITHDEBINFO_INIT "-O2 -g")
+set(CMAKE_Fortran_MODDIR_FLAG "-fmod=")
+set(CMAKE_Fortran_VERBOSE_FLAG "-v")