comment out pch specific ENV definitions and compiler flag

Author: pcaspers

Docker/Dockerfile-QuantLib

@@ -21,15 +21,16 @@ RUN apt-get update \
 
 ENV PATH="/usr/lib/ccache:$PATH"
 ENV CCACHE_DIR="/ccache"
-ENV CCACHE_SLOPPINESS="pch_defines,time_macros,pch_defines,time_macros,include_file_mtime,include_file_ctim"
+#ENV CCACHE_SLOPPINESS="pch_defines,time_macros,pch_defines,time_macros,include_file_mtime,include_file_ctim"
 ENV CCACHE_MAXSIZE="10G"
 
-# Need the dos2unix all if building from Windows because the shell 
-# scripts fail if there are CRLF present in the files
+# - Need the dos2unix all if building from Windows because the shell
+#   scripts fail if there are CRLF present in the files
+# - add  -fpch-preprocess to CMAKE_CXX_FLAGS when QL_USE_PCH is set to ON
 RUN cd /ore/QuantLib \
   && find -regex ".*\.\(sh\|in\|ac\|am\)" -exec dos2unix {} ';' \
   && mkdir -p build.ql && cd build.ql \
-  && cmake .. -DQL_USE_PCH=OFF -DCMAKE_BUILD_TYPE=${cmake_build_type} -DCMAKE_CXX_STANDARD=17 -DCMAKE_CXX_EXTENSIONS=OFF -DCMAKE_CXX_FLAGS="-D BOOST_ENABLE_ASSERT_HANDLER -mavx2 -fpch-preprocess" -DQL_ENABLE_SESSIONS=ON -DQL_ENABLE_PARALLEL_UNIT_TEST_RUNNER=ON -DQL_BUILD_EXAMPLES=OFF -DQL_BUILD_BENCHMARK=OFF
+  && cmake .. -DQL_USE_PCH=OFF -DCMAKE_BUILD_TYPE=${cmake_build_type} -DCMAKE_CXX_STANDARD=17 -DCMAKE_CXX_EXTENSIONS=OFF -DCMAKE_CXX_FLAGS="-D BOOST_ENABLE_ASSERT_HANDLER -mavx2" -DQL_ENABLE_SESSIONS=ON -DQL_ENABLE_PARALLEL_UNIT_TEST_RUNNER=ON -DQL_BUILD_EXAMPLES=OFF -DQL_BUILD_BENCHMARK=OFF
 
 WORKDIR /ore/QuantLib/build.ql
 RUN --mount=type=cache,target=/ccache/ ccache -z \