Don't overwrite the initial value of CMAKE_Fortran_FLAGS

CMAKE_Fortran_FLAGS is initialized from the FFLAGS environment variable.
If the initial value of CMAKE_Fortran_FLAGS is overwritten, comfiguring
the build using FFLAGS fails.

cmake/modules/SetUpLinux.cmake

@@ -73,7 +73,7 @@ if(CMAKE_COMPILER_IS_GNUCXX)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pipe ${BIT_ENVIRONMENT} ${FP_MATH_FLAGS} -Wshadow -Wall -W -Woverloaded-virtual -fsigned-char -fPIC")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pipe ${BIT_ENVIRONMENT} -Wall -W -fPIC")
 
-  set(CMAKE_Fortran_FLAGS "${CMAKE_FORTRAN_FLAGS} ${BIT_ENVIRONMENT} -std=legacy")
+  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${BIT_ENVIRONMENT} -std=legacy")
 
   set(CINT_CXX_DEFINITIONS "-DG__REGEXP -DG__UNIX -DG__SHAREDLIB -DG__OSFDLL -DG__ROOT -DG__REDIRECTIO -DG__STD_EXCEPTION ${SPECIAL_CINT_FLAGS}")
   set(CINT_C_DEFINITIONS "-DG__REGEXP -DG__UNIX -DG__SHAREDLIB -DG__OSFDLL -DG__ROOT -DG__REDIRECTIO -DG__STD_EXCEPTION ${SPECIAL_CINT_FLAGS}")
@@ -110,7 +110,7 @@ elseif(CMAKE_CXX_COMPILER_ID STREQUAL Clang)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pipe ${BIT_ENVIRONMENT} ${FP_MATH_FLAGS} -Wshadow -Wall -W -Woverloaded-virtual -fsigned-char -fPIC")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pipe ${BIT_ENVIRONMENT} -Wall -W -fPIC")
 
-  set(CMAKE_Fortran_FLAGS "${CMAKE_FORTRAN_FLAGS} ${BIT_ENVIRONMENT} -std=legacy")
+  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${BIT_ENVIRONMENT} -std=legacy")
 
   set(CINT_CXX_DEFINITIONS "-DG__REGEXP -DG__UNIX -DG__SHAREDLIB -DG__OSFDLL -DG__ROOT -DG__REDIRECTIO -DG__STD_EXCEPTION ${SPECIAL_CINT_FLAGS}")
   set(CINT_C_DEFINITIONS "-DG__REGEXP -DG__UNIX -DG__SHAREDLIB -DG__OSFDLL -DG__ROOT -DG__REDIRECTIO -DG__STD_EXCEPTION ${SPECIAL_CINT_FLAGS}")
@@ -147,7 +147,7 @@ elseif(CMAKE_CXX_COMPILER_ID STREQUAL Intel)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC -wd1476")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC -restrict")
 
-  set(CMAKE_Fortran_FLAGS "${CMAKE_FORTRAN_FLAGS} -fPIC")
+  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fPIC")
 
   set(CINT_CXX_DEFINITIONS "-DG__REGEXP -DG__UNIX -DG__SHAREDLIB -DG__OSFDLL -DG__ROOT -DG__REDIRECTIO -DG__STD_EXCEPTION ${SPECIAL_CINT_FLAGS}")
   set(CINT_C_DEFINITIONS "-DG__REGEXP -DG__UNIX -DG__SHAREDLIB -DG__OSFDLL -DG__ROOT -DG__REDIRECTIO -DG__STD_EXCEPTION ${SPECIAL_CINT_FLAGS}")

cmake/modules/SetUpMacOS.cmake

@@ -37,12 +37,12 @@ if (CMAKE_SYSTEM_NAME MATCHES Darwin)
        SET(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS "${CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS} -m64")
        SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m64")
        SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m64")
-       SET(CMAKE_FORTRAN_FLAGS "${CMAKE_FORTRAN_FLAGS} -m64")
+       SET(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -m64")
     else(${SYSCTL_OUTPUT} MATCHES 64)
        MESSAGE(STATUS "Found a 32bit system")
        SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")
        SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")
-       SET(CMAKE_FORTRAN_FLAGS "${CMAKE_FORTRAN_FLAGS} -m32")
+       SET(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -m32")
     endif(${SYSCTL_OUTPUT} MATCHES 64)
   endif()
 
@@ -65,7 +65,7 @@ if (CMAKE_SYSTEM_NAME MATCHES Darwin)
 
      SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pipe -W -Wshadow -Wall -Woverloaded-virtual -fsigned-char -fno-common")
      SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pipe -W -Wall -fsigned-char -fno-common")
-     SET(CMAKE_Fortran_FLAGS "${CMAKE_FORTRAN_FLAGS} -std=legacy")
+     SET(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -std=legacy")
      SET(CINT_CXX_DEFINITIONS "-DG__REGEXP -DG__UNIX -DG__SHAREDLIB -DG__ROOT -DG__REDIRECTIO -DG__OSFDLL -DG__STD_EXCEPTION")
      SET(CINT_C_DEFINITIONS "-DG__REGEXP -DG__UNIX -DG__SHAREDLIB -DG__ROOT -DG__REDIRECTIO -DG__OSFDLL -DG__STD_EXCEPTION")
 
@@ -101,7 +101,7 @@ if (CMAKE_SYSTEM_NAME MATCHES Darwin)
 
      SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pipe -W -Wshadow -Wall -Woverloaded-virtual -fsigned-char -fno-common -Qunused-arguments")
      SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pipe -W -Wall -fsigned-char -fno-common -Qunused-arguments")
-     SET(CMAKE_Fortran_FLAGS "${CMAKE_FORTRAN_FLAGS} -std=legacy")
+     SET(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -std=legacy")
      SET(CINT_CXX_DEFINITIONS "-DG__REGEXP -DG__UNIX -DG__SHAREDLIB -DG__ROOT -DG__REDIRECTIO -DG__OSFDLL -DG__STD_EXCEPTION")
      SET(CINT_C_DEFINITIONS "-DG__REGEXP -DG__UNIX -DG__SHAREDLIB -DG__ROOT -DG__REDIRECTIO -DG__OSFDLL -DG__STD_EXCEPTION")
 

cmake/modules/SetUpWindows.cmake

@@ -13,7 +13,7 @@ if(CMAKE_COMPILER_IS_GNUCXX)
 
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pipe  -Wall -W -Woverloaded-virtual -fPIC")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pipe -Wall -W -fPIC")
-  set(CMAKE_Fortran_FLAGS "${CMAKE_FORTRAN_FLAGS} -std=legacy")
+  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -std=legacy")
 
   set(CINT_CXX_DEFINITIONS "-DG__REGEXP -DG__UNIX -DG__SHAREDLIB -DG__OSFDLL -DG__ROOT -DG__REDIRECTIO -DG__STD_EXCEPTION ${SPECIAL_CINT_FLAGS}")
   set(CINT_C_DEFINITIONS "-DG__REGEXP -DG__UNIX -DG__SHAREDLIB -DG__OSFDLL -DG__ROOT -DG__REDIRECTIO -DG__STD_EXCEPTION ${SPECIAL_CINT_FLAGS}")