Reduce duplication in Platform/<os>.cmake files

Several platform-wide linker flag variables are defined in
Modules/Platform/<os>.cmake files for C and then copied by the
Modules/CMake<lang>Information.cmake file for each language.
We now use this approach for the variables

  CMAKE_EXE_EXPORTS_${lang}_FLAG
  CMAKE_SHARED_LIBRARY_SONAME_${lang}_FLAG
  CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS

to avoid duplication for multiple languages in each platform file.

Modules/CMakeCXXInformation.cmake

@@ -114,6 +114,14 @@ IF(NOT CMAKE_SHARED_LIBRARY_RPATH_LINK_CXX_FLAG)
   SET(CMAKE_SHARED_LIBRARY_RPATH_LINK_CXX_FLAG ${CMAKE_SHARED_LIBRARY_RPATH_LINK_C_FLAG})
 ENDIF(NOT CMAKE_SHARED_LIBRARY_RPATH_LINK_CXX_FLAG)
 
+IF(NOT DEFINED CMAKE_EXE_EXPORTS_CXX_FLAG)
+  SET(CMAKE_EXE_EXPORTS_CXX_FLAG ${CMAKE_EXE_EXPORTS_C_FLAG})
+ENDIF()
+
+IF(NOT DEFINED CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG)
+  SET(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG ${CMAKE_SHARED_LIBRARY_SONAME_C_FLAG})
+ENDIF()
+
 IF(NOT CMAKE_EXECUTABLE_RUNTIME_CXX_FLAG)
   SET(CMAKE_EXECUTABLE_RUNTIME_CXX_FLAG ${CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG})
 ENDIF(NOT CMAKE_EXECUTABLE_RUNTIME_CXX_FLAG)

Modules/CMakeFortranInformation.cmake

@@ -89,6 +89,14 @@ IF(NOT CMAKE_SHARED_LIBRARY_RPATH_LINK_Fortran_FLAG)
   SET(CMAKE_SHARED_LIBRARY_RPATH_LINK_Fortran_FLAG ${CMAKE_SHARED_LIBRARY_RPATH_LINK_C_FLAG})
 ENDIF(NOT CMAKE_SHARED_LIBRARY_RPATH_LINK_Fortran_FLAG)
 
+IF(NOT DEFINED CMAKE_EXE_EXPORTS_Fortran_FLAG)
+  SET(CMAKE_EXE_EXPORTS_Fortran_FLAG ${CMAKE_EXE_EXPORTS_C_FLAG})
+ENDIF()
+
+IF(NOT DEFINED CMAKE_SHARED_LIBRARY_SONAME_Fortran_FLAG)
+  SET(CMAKE_SHARED_LIBRARY_SONAME_Fortran_FLAG ${CMAKE_SHARED_LIBRARY_SONAME_C_FLAG})
+ENDIF()
+
 # repeat for modules
 IF(NOT CMAKE_SHARED_MODULE_CREATE_Fortran_FLAGS)
   SET(CMAKE_SHARED_MODULE_CREATE_Fortran_FLAGS ${CMAKE_SHARED_MODULE_CREATE_C_FLAGS})

Modules/Platform/BeOS.cmake

@@ -6,6 +6,5 @@ SET(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-nostart")
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "-Wl,-rpath,")
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP ":")
 SET(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-Wl,-soname,")
-SET(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG "-Wl,-soname,")
 
 INCLUDE(Platform/UnixPaths)

Modules/Platform/Darwin.cmake

@@ -172,8 +172,6 @@ IF(NOT XCODE)
   # but the fact that the setting exists will cause the generators to support
   # soname computation.
   SET(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-install_name")
-  SET(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG "-install_name")
-  SET(CMAKE_SHARED_LIBRARY_SONAME_Fortran_FLAG "-install_name")
 ENDIF(NOT XCODE)
 
 # Xcode does not support -isystem yet.

Modules/Platform/FreeBSD.cmake

@@ -7,9 +7,7 @@ IF(EXISTS /usr/include/dlfcn.h)
   SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP ":")   # : or empty
   SET(CMAKE_SHARED_LIBRARY_RPATH_LINK_C_FLAG "-Wl,-rpath-link,")
   SET(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-Wl,-soname,")
-  SET(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG "-Wl,-soname,")
   SET(CMAKE_EXE_EXPORTS_C_FLAG "-Wl,--export-dynamic")
-  SET(CMAKE_EXE_EXPORTS_CXX_FLAG "-Wl,--export-dynamic")
 ENDIF(EXISTS /usr/include/dlfcn.h)
 
 # Shared libraries with no builtin soname may not be linked safely by

Modules/Platform/GNU.cmake

@@ -5,5 +5,4 @@ SET(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-shared")
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "-Wl,-rpath,")
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP ":")
 SET(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-Wl,-soname,")
-SET(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG "-Wl,-soname,")
 INCLUDE(Platform/UnixPaths)

Modules/Platform/Haiku.cmake

@@ -6,7 +6,6 @@ SET(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-nostart")
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "-Wl,-rpath,")
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP ":")
 SET(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-Wl,-soname,")
-SET(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG "-Wl,-soname,")
 
 INCLUDE(Platform/UnixPaths)
 LIST(APPEND CMAKE_SYSTEM_PREFIX_PATH /boot/common)

Modules/Platform/IRIX.cmake

@@ -1,6 +1,5 @@
 SET(CMAKE_DL_LIBS "")
 SET(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-shared -rdata_shared")
-SET(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS "-shared -rdata_shared") 
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "-Wl,-rpath,")       # -rpath
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP "")   # : or empty
 IF(NOT CMAKE_COMPILER_IS_GNUCXX)

Modules/Platform/IRIX64.cmake

@@ -1,10 +1,8 @@
 SET(CMAKE_DL_LIBS "")
 SET(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-shared -rdata_shared")
-SET(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS "-shared -rdata_shared") 
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "-Wl,-rpath,")       # -rpath
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP "")   # : or empty
 SET(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-Wl,-soname,")
-SET(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG "-Wl,-soname,")
 IF(NOT CMAKE_COMPILER_IS_GNUCC)
   # Set default flags init.
   SET(CMAKE_C_FLAGS_INIT "")

Modules/Platform/Linux-Intel-Fortran.cmake

@@ -12,5 +12,4 @@ SET(CMAKE_SHARED_LIBRARY_CREATE_Fortran_FLAGS "-shared -i_dynamic -nofor_main")
 SET(CMAKE_SHARED_LIBRARY_LINK_Fortran_FLAGS "-i_dynamic")
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_Fortran_FLAG "-Wl,-rpath,")
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_Fortran_FLAG_SEP ":")
-SET(CMAKE_SHARED_LIBRARY_SONAME_Fortran_FLAG "-Wl,-soname,")
 SET(CMAKE_DL_LIBS "dl")

Modules/Platform/Linux-SunPro-C.cmake

@@ -1,3 +1,2 @@
 # Linux sun studio c options
 SET(CMAKE_DL_LIBS "dl")
-SET(CMAKE_EXE_EXPORTS_C_FLAG "-Wl,--export-dynamic")

Modules/Platform/Linux.cmake

@@ -6,10 +6,7 @@ SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "-Wl,-rpath,")
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP ":")
 SET(CMAKE_SHARED_LIBRARY_RPATH_LINK_C_FLAG "-Wl,-rpath-link,")
 SET(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-Wl,-soname,")
-SET(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG "-Wl,-soname,")
-SET(CMAKE_SHARED_LIBRARY_SONAME_Fortran_FLAG "-Wl,-soname,")
 SET(CMAKE_EXE_EXPORTS_C_FLAG "-Wl,--export-dynamic")
-SET(CMAKE_EXE_EXPORTS_CXX_FLAG "-Wl,--export-dynamic")
 
 # Shared libraries with no builtin soname may not be linked safely by
 # specifying the file path.

Modules/Platform/NetBSD.cmake

@@ -7,9 +7,7 @@ IF(EXISTS /usr/include/dlfcn.h)
   SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP ":")   # : or empty
   SET(CMAKE_SHARED_LIBRARY_RPATH_LINK_C_FLAG "-Wl,-rpath-link,")
   SET(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-Wl,-soname,")
-  SET(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG "-Wl,-soname,")
   SET(CMAKE_EXE_EXPORTS_C_FLAG "-Wl,--export-dynamic")
-  SET(CMAKE_EXE_EXPORTS_CXX_FLAG "-Wl,--export-dynamic")
 ENDIF(EXISTS /usr/include/dlfcn.h)
 
 INCLUDE(Platform/UnixPaths)

Modules/Platform/OSF1.cmake

@@ -12,7 +12,6 @@ ENDIF(CMAKE_SYSTEM MATCHES "OSF1-1.*")
 
 IF(CMAKE_SYSTEM MATCHES "OSF1-V.*")
   SET(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-shared -Wl,-expect_unresolved,\\*")       # -shared
-  SET(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS "-shared -Wl,-expect_unresolved,\\*")       # -shared
   IF(CMAKE_COMPILER_IS_GNUCXX)
     SET(CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG "-Wl,-rpath,")  
   ELSE(CMAKE_COMPILER_IS_GNUCXX)

Modules/Platform/QNX.cmake

@@ -12,9 +12,7 @@ SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG "-Wl,-rpath,")
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP ":")
 SET(CMAKE_SHARED_LIBRARY_RPATH_LINK_C_FLAG "-Wl,-rpath-link,")
 SET(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-Wl,-soname,")
-SET(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG "-Wl,-soname,")
 SET(CMAKE_EXE_EXPORTS_C_FLAG "-Wl,--export-dynamic")
-SET(CMAKE_EXE_EXPORTS_CXX_FLAG "-Wl,--export-dynamic")
 
 # Shared libraries with no builtin soname may not be linked safely by
 # specifying the file path.

Modules/Platform/syllable.cmake

@@ -14,9 +14,7 @@ SET(CMAKE_SHARED_LIBRARY_C_FLAGS "-fPIC")            # -pic
 SET(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-shared")       # -shared
 SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "")         # +s, flag for exe link to use shared lib
 SET(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG "-Wl,-soname,")
-SET(CMAKE_SHARED_LIBRARY_SONAME_CXX_FLAG "-Wl,-soname,")
 #SET(CMAKE_EXE_EXPORTS_C_FLAG "-Wl,--export-dynamic")
-#SET(CMAKE_EXE_EXPORTS_CXX_FLAG "-Wl,--export-dynamic")
 
 # Initialize C link type selection flags.  These flags are used when
 # building a shared library, shared module, or executable that links