From: Daniel Arndt <daniel.arndt@iwr.uni-heidelberg.de>
Date: Wed, 25 Oct 2017 08:54:30 +0000 (+0200)
Subject: Check that Boost.Iostreams is usuable for an external BOOST package
X-Git-Tag: v9.0.0-rc1~870^2~2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=151c58c06afa51cb6d23ada27fd72396f79351db;p=dealii.git

Check that Boost.Iostreams is usuable for an external BOOST package
---

diff --git a/cmake/modules/FindBOOST.cmake b/cmake/modules/FindBOOST.cmake
index 26e9a80c0a..57c35234c9 100644
--- a/cmake/modules/FindBOOST.cmake
+++ b/cmake/modules/FindBOOST.cmake
@@ -78,6 +78,51 @@ IF(Boost_FOUND)
   SET(BOOST_VERSION
     "${BOOST_VERSION_MAJOR}.${BOOST_VERSION_MINOR}.${BOOST_VERSION_SUBMINOR}"
     )
+
+  IF(DEAL_II_WITH_ZLIB)
+    #
+    # Test that Boost.Iostreams is usuable.
+    #
+    RESET_CMAKE_REQUIRED()
+    PUSH_CMAKE_REQUIRED("${DEAL_II_CXX_VERSION_FLAG}")
+    PUSH_CMAKE_REQUIRED("-L${Boost_LIBRARY_DIRS}")
+    SET(CMAKE_REQUIRED_LIBRARIES "-lboost_iostreams")
+    CHECK_CXX_SOURCE_COMPILES(
+      "
+      #include <string>
+      #include <boost/iostreams/device/back_inserter.hpp>
+      #include <boost/iostreams/filter/gzip.hpp>
+      #include <boost/iostreams/filtering_stream.hpp>
+
+      int main()
+      {
+        std::string decompressed_buffer;
+        char test[1] = {'c'};
+
+        boost::iostreams::filtering_ostream decompressing_stream;
+        decompressing_stream.push(boost::iostreams::gzip_decompressor());
+        decompressing_stream.push(boost::iostreams::back_inserter(decompressed_buffer));
+        decompressing_stream.write (test, 1);
+      }
+      "
+      DEAL_II_BOOST_IOSTREAMS_USUABLE
+      )
+    MESSAGE(STATUS "${DEAL_II_BOOST_IOSTREAMS_USUABLE}")
+    IF(${DEAL_II_BOOST_IOSTREAMS_USUABLE})
+      MESSAGE(STATUS "Boost.Iostreams is usuable.")
+    ELSE()
+      MESSAGE(STATUS
+              "DEAL_II_WITH_ZLIB=ON requires Boost.Iostreams to be compiled "
+              "with zlib support but a simple test failed! "
+              "Therefore, the bundled boost package is used."
+             )
+      SET(Boost_FOUND FALSE)
+      SET(Boost_LIBRARIES "")
+      SET(Boost_INCLUDE_DIRS "")
+    ENDIF()
+    RESET_CMAKE_REQUIRED()
+  ENDIF()
+
 ENDIF()
 
 DEAL_II_PACKAGE_HANDLE(BOOST
@@ -85,7 +130,7 @@ DEAL_II_PACKAGE_HANDLE(BOOST
   INCLUDE_DIRS REQUIRED Boost_INCLUDE_DIRS
   USER_INCLUDE_DIRS Boost_INCLUDE_DIRS
   CLEAR
-    Boost_DIR Boost_INCLUDE_DIR Boost_IOSTREAMS_LIBRARY_DEBUG
+    Boost_DIR Boost_INCLUDE_DIRS Boost_IOSTREAMS_LIBRARY_DEBUG
     Boost_IOSTREAMS_LIBRARY_RELEASE Boost_LIBRARY_DIR
     Boost_SERIALIZATION_LIBRARY_DEBUG Boost_SERIALIZATION_LIBRARY_RELEASE
     Boost_SYSTEM_LIBRARY_DEBUG Boost_SYSTEM_LIBRARY_RELEASE