ENH: CMAKE_<LANG>_LINKER_PREFERENCE is now an integer priority, not a

two-step priority (None or Prefered)
Current order: ASM 0, C 10, Fortran 20, CXX 30, Java 40
This is the same order as automake choses:
http://www.gnu.org/software/automake/manual/html_node/How-the-Linker-is-Chosen.html

This change should be backward compatible:
if there is a project using fortran and CXX, they had to set the
LINKER_LANGUAGE explicitely, otherwise cmake complained (but still generated
the project files). Explicitely setting the linker language still overrides
automatic detection.
If somebody has a custom language for cmake and the PREFERENCE starts with
"P", its changed to 100, which gives it preference over all other languages
(except the other custom languages which have also "Prefered"). "None" is
converted to 0.

Alex

7 files changed, 17 insertions, 6 deletions

diff --git a/Modules/CMakeASMCompiler.cmake.in b/Modules/CMakeASMCompiler.cmake.in
index f839a3e220..230805bf42 100644
--- a/Modules/CMakeASMCompiler.cmake.in
+++ b/Modules/CMakeASMCompiler.cmake.in
@@ -7,5 +7,5 @@ SET(CMAKE_ASM@ASM_DIALECT@_COMPILER_LOADED 1)
 SET(CMAKE_ASM@ASM_DIALECT@_COMPILER_ENV_VAR "@_CMAKE_ASM_COMPILER_ENV_VAR@")
 
 SET(CMAKE_ASM@ASM_DIALECT@_IGNORE_EXTENSIONS h;H;o;O;obj;OBJ;def;DEF;rc;RC)
-SET(CMAKE_ASM@ASM_DIALECT@_LINKER_PREFERENCE None)
+SET(CMAKE_ASM@ASM_DIALECT@_LINKER_PREFERENCE 0)
 
diff --git a/Modules/CMakeCCompiler.cmake.in b/Modules/CMakeCCompiler.cmake.in
index b746abaf89..6a7fef818c 100644
--- a/Modules/CMakeCCompiler.cmake.in
+++ b/Modules/CMakeCCompiler.cmake.in
@@ -21,7 +21,7 @@ ENDIF(CMAKE_COMPILER_IS_MINGW)
 SET(CMAKE_C_COMPILER_ID_RUN 1)
 SET(CMAKE_C_SOURCE_FILE_EXTENSIONS c)
 SET(CMAKE_C_IGNORE_EXTENSIONS h;H;o;O;obj;OBJ;def;DEF;rc;RC)
-SET(CMAKE_C_LINKER_PREFERENCE None)
+SET(CMAKE_C_LINKER_PREFERENCE 10)
 
 # save the size of void* in case where cache is removed
 # and the this file is still around
diff --git a/Modules/CMakeCXXCompiler.cmake.in b/Modules/CMakeCXXCompiler.cmake.in
index f2c53d59c0..b3a84dd1dd 100644
--- a/Modules/CMakeCXXCompiler.cmake.in
+++ b/Modules/CMakeCXXCompiler.cmake.in
@@ -21,7 +21,7 @@ ENDIF(CMAKE_COMPILER_IS_MINGW)
 SET(CMAKE_CXX_COMPILER_ID_RUN 1)
 SET(CMAKE_CXX_IGNORE_EXTENSIONS inl;h;H;o;O;obj;OBJ;def;DEF;rc;RC)
 SET(CMAKE_CXX_SOURCE_FILE_EXTENSIONS C;M;c++;cc;cpp;cxx;m;mm)
-SET(CMAKE_CXX_LINKER_PREFERENCE Prefered)
+SET(CMAKE_CXX_LINKER_PREFERENCE 30)
 
 # save the size of void* in case where cache is removed
 # and the this file is still around
diff --git a/Modules/CMakeForceCompiler.cmake b/Modules/CMakeForceCompiler.cmake
index d104ad9c02..751fd7850f 100644
--- a/Modules/CMakeForceCompiler.cmake
+++ b/Modules/CMakeForceCompiler.cmake
@@ -38,6 +38,12 @@ MACRO(CMAKE_FORCE_C_COMPILER compiler id sizeof_void)
   SET(CMAKE_C_COMPILER_ID_RUN TRUE)
   SET(CMAKE_C_COMPILER_ID ${id})
   SET(CMAKE_C_COMPILER_WORKS TRUE)
+
+  # Set old compiler and platform id variables.
+  IF("${CMAKE_C_COMPILER_ID}" MATCHES "GNU")
+    SET(CMAKE_COMPILER_IS_GNUCC 1)
+  ENDIF("${CMAKE_C_COMPILER_ID}" MATCHES "GNU")
+
   SET(CMAKE_SIZEOF_VOID_P ${sizeof_void} CACHE STRING "sizeof void")
   SET(HAVE_CMAKE_SIZEOF_VOID_P TRUE CACHE INTERNAL "have sizeof void")
 ENDMACRO(CMAKE_FORCE_C_COMPILER)
@@ -47,5 +53,10 @@ MACRO(CMAKE_FORCE_CXX_COMPILER compiler id)
   SET(CMAKE_CXX_COMPILER_ID_RUN TRUE)
   SET(CMAKE_CXX_COMPILER_ID ${id})
   SET(CMAKE_CXX_COMPILER_WORKS TRUE)
+
+  IF("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
+    SET(CMAKE_COMPILER_IS_GNUCXX 1)
+  ENDIF("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
+
 ENDMACRO(CMAKE_FORCE_CXX_COMPILER)
 
diff --git a/Modules/CMakeFortranCompiler.cmake.in b/Modules/CMakeFortranCompiler.cmake.in
index a4f3941bad..67a0c64a16 100644
--- a/Modules/CMakeFortranCompiler.cmake.in
+++ b/Modules/CMakeFortranCompiler.cmake.in
@@ -21,7 +21,7 @@ ENDIF(CMAKE_COMPILER_IS_MINGW)
 SET(CMAKE_Fortran_COMPILER_ID_RUN 1)
 SET(CMAKE_Fortran_SOURCE_FILE_EXTENSIONS f;F;f77;F77;f90;F90;for;f95;F95)
 SET(CMAKE_Fortran_IGNORE_EXTENSIONS h;H;o;O;obj;OBJ;def;DEF;rc;RC)
-SET(CMAKE_Fortran_LINKER_PREFERENCE Prefered)
+SET(CMAKE_Fortran_LINKER_PREFERENCE 20)
 IF(UNIX)
   SET(CMAKE_Fortran_OUTPUT_EXTENSION .o)
 ELSE(UNIX)
diff --git a/Modules/CMakeJavaCompiler.cmake.in b/Modules/CMakeJavaCompiler.cmake.in
index c9eeb14c8b..83c1ee44a1 100644
--- a/Modules/CMakeJavaCompiler.cmake.in
+++ b/Modules/CMakeJavaCompiler.cmake.in
@@ -5,7 +5,7 @@ SET(CMAKE_Java_ARCHIVE  "@CMAKE_Java_ARCHIVE@")
 SET(CMAKE_Java_COMPILER_LOADED 1)
 
 SET(CMAKE_Java_SOURCE_FILE_EXTENSIONS java)
-SET(CMAKE_Java_LINKER_PREFERENCE Prefered)
+SET(CMAKE_Java_LINKER_PREFERENCE 40)
 SET(CMAKE_Java_OUTPUT_EXTENSION .class)
 SET(CMAKE_STATIC_LIBRARY_PREFIX_Java "")
 SET(CMAKE_STATIC_LIBRARY_SUFFIX_Java ".jar")
diff --git a/Modules/CMakeLists.txt b/Modules/CMakeLists.txt
index c575043b54..c3b5903e97 100644
--- a/Modules/CMakeLists.txt
+++ b/Modules/CMakeLists.txt
@@ -1,5 +1,5 @@
 # just install the modules
-# new file added, force rerunning cmake #
+# new file added, force rerunning cmake
 
 SUBDIRS(Platform)
 INSTALL_FILES(${CMAKE_DATA_DIR}/Modules .*\\.cmake$)