[Qgis-developer] PATCH: check gdal version at cmake time

[strk]

The attached macro checks that GDAL is at least 
version 1.4.0 or refuses to complete configuration
successfully.

Tests welcome.

Thanks jef for documenting the min requirement :)

--strk;

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-------------- next part --------------
Index: cmake/FindGDAL.cmake
===================================================================
--- cmake/FindGDAL.cmake	(revision 9670)
+++ cmake/FindGDAL.cmake	(working copy)
@@ -49,6 +49,25 @@
     # MESSAGE("DBG GDAL_CONFIG ${GDAL_CONFIG}")
     
     IF (GDAL_CONFIG) 
+
+      ## extract gdal version 
+      EXEC_PROGRAM(${GDAL_CONFIG}
+        ARGS --version
+        OUTPUT_VARIABLE GDAL_VERSION )
+      STRING(REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\1" GDAL_VERSION_MAJOR "${GDAL_VERSION}")
+      STRING(REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\2" GDAL_VERSION_MINOR "${GDAL_VERSION}")
+  
+      # MESSAGE("DBG GDAL_VERSION ${GDAL_VERSION}")
+      # MESSAGE("DBG GDAL_VERSION_MAJOR ${GDAL_VERSION_MAJOR}")
+      # MESSAGE("DBG GDAL_VERSION_MINOR ${GDAL_VERSION_MINOR}")
+  
+      # check for gdal version
+      # version 1.2.5 is known NOT to be supported (missing CPL_STDCALL macro)
+      # According to INSTALL, 1.4.0+ is required
+      IF (GDAL_VERSION_MAJOR LESS 1 OR GDAL_VERSION_MINOR LESS 4)
+          MESSAGE (FATAL_ERROR "GDAL version is too old (${GDAL_VERSION}). Use 1.4.0 or higher.")
+      ENDIF (GDAL_VERSION_MAJOR LESS 1 OR GDAL_VERSION_MINOR LESS 3)
+
       # set INCLUDE_DIR to prefix+include
       EXEC_PROGRAM(${GDAL_CONFIG}
         ARGS --prefix