Enable C++17 for clang-cl, too

Similar to libc++ in C++17 mode, some types like std::auto_ptr are indeed
removed in C++17 mode by default, and need _HAS_AUTO_PTR_ETC=1 to be enabled
(see <https://blogs.msdn.microsoft.com/vcblog/2017/12/08/c17-feature-removals-
and-deprecations/>).

Unlike libc++, also std::binary_function and std::unary_function are removed
(and need the same _HAS_AUTO_PTR_ETC=1 to enable).  So either set that flag to
make external code build, or use patches (for external/mdds) to make externals'
files included in LO proper still work there.

Change-Id: I886cc0de8196255334ee03ec48cb4bc54d460afd
Reviewed-on: https://gerrit.libreoffice.org/46514Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

compilerplugins/clang/reservedid.cxx

@@ -69,6 +69,7 @@ void ReservedId::run() {
                 && id != "_ATL_STATIC_REGISTRY"
                     // extensions/source/activex/StdAfx2.h
                 && id != "_GLIBCXX_CDTOR_CALLABI"
+                && id != "_HAS_AUTO_PTR_ETC" // unotools/source/i18n/resmgr.cxx
                 && id != "_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR" // unotools/source/i18n/resmgr.cxx
                 && id != "_MAX_PATH" // Windows
                 && id != "_POSIX_SOURCE"

configure.ac

@@ -6037,11 +6037,11 @@ libo_FUZZ_ARG_ENABLE(c++17,
 )
 
 CXXFLAGS_CXX11=
-if test "$COM" = MSC; then
+if test "$COM" = MSC -a "$COM_IS_CLANG" != TRUE; then
     AC_MSG_CHECKING([whether $CXX supports C++11])
     AC_MSG_RESULT(yes)
     # MSVC supports (a subset of) CXX11 without any switch
-elif test "$GCC" = "yes"; then
+elif test "$GCC" = "yes" -o "$COM_IS_CLANG" = TRUE; then
     HAVE_CXX11=
     AC_MSG_CHECKING([whether $CXX supports C++17, C++14, or C++11])
     dnl But only use C++17 if the gperf that is being used knows not to emit
@@ -6052,6 +6052,9 @@ elif test "$GCC" = "yes"; then
         my_flags="-std=gnu++17 -std=gnu++1z -std=c++17 -std=c++1z $my_flags"
     fi
     for flag in $my_flags; do
+        if test "$COM" = MSC; then
+            flag="-Xclang $flag"
+        fi
         save_CXXFLAGS=$CXXFLAGS
         CXXFLAGS="$CXXFLAGS $flag -Werror"
         if test "$SYSTEM_LIBCMIS" = TRUE; then

external/boost/StaticLibrary_boost_date_time.mk

@@ -18,6 +18,13 @@ $(eval $(call gb_StaticLibrary_add_defs,boost_date_time,\
 	-DBOOST_ALL_NO_LIB \
 ))
 
+# Needed when building against MSVC in C++17 mode, as
+# workdir/UnpackedTarball/boost/boost/numeric/conversion/detail/converter.hpp uses
+# std::unary_function:
+$(eval $(call gb_StaticLibrary_add_defs,boost_date_time, \
+    -D_HAS_AUTO_PTR_ETC=1 \
+))
+
 $(eval $(call gb_StaticLibrary_use_external,boost_date_time,boost_headers))
 
 $(eval $(call gb_StaticLibrary_set_generated_cxx_suffix,boost_date_time,cpp))

external/boost/StaticLibrary_boost_locale.mk

@@ -18,9 +18,10 @@ $(eval $(call gb_StaticLibrary_add_defs,boost_locale,\
 	-DBOOST_ALL_NO_LIB -DBOOST_LOCALE_NO_WINAPI_BACKEND -DBOOST_LOCALE_NO_POSIX_BACKEND -DBOOST_USE_WINDOWS_H \
 ))
 
-# Needed when building against libc++ in C++17 mode, as Boost 1.65.1
+# Needed when building against MSVC resp. libc++ in C++17 mode, as Boost 1.65.1
 # workdir/UnpackedTarball/boost/boost/locale/generator.hpp contains "std::auto_ptr<data> d;":
 $(eval $(call gb_StaticLibrary_add_defs,boost_locale, \
+    -D_HAS_AUTO_PTR_ETC=1 \
     -D_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR \
 ))
 

external/clucene/Library_clucene.mk

@@ -29,6 +29,12 @@ $(eval $(call gb_Library_add_defs,clucene,\
     -Dclucene_contribs_lib_EXPORTS \
 ))
 
+# Needed when building against MSVC in C++17 mode, as
+# workdir/UnpackedTarball/clucene/src/core/CLucene/util/Equators.h uses std::binary_function:
+$(eval $(call gb_Library_add_defs,clucene, \
+    -D_HAS_AUTO_PTR_ETC=1 \
+))
+
 # clucene is riddled with warnings... let's spare use
 # the pointless spamming
 $(eval $(call gb_Library_add_cxxflags,clucene,\

external/liborcus/Library_orcus-parser.mk

@@ -30,6 +30,12 @@ $(eval $(call gb_Library_add_defs,orcus-parser,\
 	-D__ORCUS_PSR_BUILDING_DLL \
 ))
 
+# Needed when building against MSVC in C++17 mode, as
+# workdir/UnpackedTarball/liborcus/include/orcus/global.hpp uses std::unary_function:
+$(eval $(call gb_Library_add_defs,orcus-parser, \
+    -D_HAS_AUTO_PTR_ETC=1 \
+))
+
 $(eval $(call gb_Library_set_generated_cxx_suffix,orcus-parser,cpp))
 
 $(eval $(call gb_Library_add_generated_exception_objects,orcus-parser,\

external/liborcus/Library_orcus.mk

@@ -36,6 +36,12 @@ $(eval $(call gb_Library_add_defs,orcus,\
 	-D__ORCUS_XLS_XML \
 ))
 
+# Needed when building against MSVC in C++17 mode, as
+# workdir/UnpackedTarball/liborcus/src/liborcus/css_document_tree.cpp uses std::unary_function:
+$(eval $(call gb_Library_add_defs,orcus, \
+    -D_HAS_AUTO_PTR_ETC=1 \
+))
+
 $(eval $(call gb_Library_use_libraries,orcus,\
 	orcus-parser \
 ))

external/mdds/UnpackedTarball_mdds.mk

@@ -14,6 +14,7 @@ $(eval $(call gb_UnpackedTarball_set_tarball,mdds,$(MDDS_TARBALL)))
 $(eval $(call gb_UnpackedTarball_set_patchlevel,mdds,0))
 
 $(eval $(call gb_UnpackedTarball_add_patches,mdds,\
+    external/mdds/c++17.patch \
 ))
 
 # vim: set noet sw=4 ts=4:

external/mdds/c++17.patch

+--- include/mdds/multi_type_matrix.hpp
++++ include/mdds/multi_type_matrix.hpp
+@@ -149,7 +149,7 @@
+ 
+ private:
+     template<typename _Func>
+-    struct walk_func : std::unary_function<typename store_type::const_iterator::value_type, void>
++    struct walk_func
+     {
+         _Func& m_func;
+         walk_func(_Func& func) : m_func(func) {}
+--- include/mdds/multi_type_vector.hpp
++++ include/mdds/multi_type_vector.hpp
+@@ -139,7 +139,7 @@
+         block& operator=(block);
+     };
+ 
+-    struct element_block_deleter : public std::unary_function<void, const element_block_type*>
++    struct element_block_deleter
+     {
+         void operator() (const element_block_type* p)
+         {

unotools/source/i18n/resmgr.cxx

@@ -23,6 +23,8 @@
 #include <config_libcxx.h>
 #if HAVE_LIBCXX && __cplusplus >= 201703L
 #define _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR
+#elif defined _MSC_VER && __cplusplus >= 201703L
+#define _HAS_AUTO_PTR_ETC 1
 #endif
 
 #include <config_folders.h>