CI: special config for develop builds with warm ccache

CI/ubuntu-18.04-llvm-nodoc.cmake

+#
+# Copyright (C) 2005-2019 Centre National d'Etudes Spatiales (CNES)
+#
+# This file is part of Orfeo Toolbox
+#
+#     https://www.orfeo-toolbox.org/
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Configuration options for ubuntu-18.04-llvm-nodoc
+
+set(site_option
+"opencv_INCLUDE_DIR:PATH=/usr/include
+CMAKE_C_COMPILER:STRING=clang
+CMAKE_CXX_COMPILER:STRING=clang++
+CMAKE_EXE_LINKER_FLAGS:STRING=-fuse-ld=lld
+CMAKE_MODULE_LINKER_FLAGS:STRING=-fuse-ld=lld
+CMAKE_SHARED_LINKER_FLAGS:STRING=-fuse-ld=lld
+CMAKE_C_COMPILER_LAUNCHER:STRING=ccache
+CMAKE_CXX_COMPILER_LAUNCHER:STRING=ccache
+OTB_USE_SHARK:BOOL=OFF")