initial opencl configure pieces.

Change-Id: I5592fdab8f6029e371b3d70f3334b737a6262eac

config_host.mk.in

@@ -139,6 +139,7 @@ export ENABLE_NPAPI_FROM_BROWSER=@ENABLE_NPAPI_FROM_BROWSER@
 export ENABLE_NPAPI_INTO_BROWSER=@ENABLE_NPAPI_INTO_BROWSER@
 export ENABLE_ONLINE_UPDATE=@ENABLE_ONLINE_UPDATE@
 export ENABLE_OPENGL=@ENABLE_OPENGL@
+export ENABLE_OPENCL=@ENABLE_OPENCL@
 export ENABLE_PACKAGEKIT=@ENABLE_PACKAGEKIT@
 export ENABLE_PCH=@ENABLE_PCH@
 export ENABLE_PDFIMPORT=@ENABLE_PDFIMPORT@
@@ -378,6 +379,8 @@ export OOOP_SAMPLES_PACK=@OOOP_SAMPLES_PACK@
 export OOOP_TEMPLATES_PACK=@OOOP_TEMPLATES_PACK@
 export OOO_JUNIT_JAR=@OOO_JUNIT_JAR@
 export OOO_VENDOR=@OOO_VENDOR@
+export OPENCL_CFLAGS=$(gb_SPACE)@OPENCL_CFLAGS@
+export OPENCL_LIBS=$(gb_SPACE)@OPENCL_LIBS@
 export OPENSSL_CFLAGS=$(gb_SPACE)@OPENSSL_CFLAGS@
 export OPENSSL_LIBS=$(gb_SPACE)@OPENSSL_LIBS@
 export ORCUS_CFLAGS=$(gb_SPACE)@ORCUS_CFLAGS@

configure.ac

@@ -1754,6 +1754,16 @@ AC_ARG_WITH(windows-sdk,
     ],
 ,)
 
+AC_ARG_WITH(opencl-sdk,
+    AS_HELP_STRING([--with-opencl-sdk],
+        [If you have the AMD HSA / opencl SDK installed (cf.
+         http://developer.amd.com/tools-and-sdks/heterogeneous-computing/amd-accelerated-parallel-processing-app-sdk/downloads/ )
+         Pass the absolute path to where that SDK is unpacked.])
+    [
+                          Usage:     --with-opencl-sdk=/opt/AMDAPP
+    ],
+,)
+
 AC_ARG_WITH(lang,
     AS_HELP_STRING([--with-lang],
         [Use this option to build LibreOffice with additional language support.
@@ -9733,6 +9743,30 @@ fi
 AC_SUBST(SYSTEM_MESA_HEADERS)
 AC_SUBST(ENABLE_OPENGL)
 
+dnl =================================================
+dnl Check whether the OpenCL libraries are available
+dnl =================================================
+
+OPENCL_LIBS=
+OPENCL_CFLAGS=
+ENABLE_OPENCL=
+AC_MSG_CHECKING([opencl sdk])
+if test "z$with_opencl_sdk" = "z"; then
+       AC_MSG_RESULT([no])
+else
+       if test -d $with_opencl_sdk/include; then
+               ENABLE_OPENCL=TRUE
+               OPENCL_CFLAGS="-I $with_opencl_sdk/include"
+               OPENCL_LIBS="-L $with_opencl_sdk/lib/x86 -lOpenCL"
+               AC_MSG_RESULT([found at path $with_opencl_sdk])
+       else
+               AC_MSG_ERROR([no headers found found at $with_opencl_sdk/include ])
+       fi
+fi
+AC_SUBST(OPENCL_CFLAGS)
+AC_SUBST(OPENCL_LIBS)
+AC_SUBST(ENABLE_OPENCL)
+
 # presenter minimizer extension?
 AC_MSG_CHECKING([whether to build the Presentation Minimizer extension])
 if test "x$enable_ext_presenter_minimizer" != "xno" -a "x$enable_extension_integration" != "xno"; then