use clang-cl's -Zc:dllexportInlines- for clang-cl builds

This is clang-cl's equivalent of -fvisibility-inlines-hidden,
and it seems to be also sort of the equivalent of MSVC's
-Zc:inline. So it saves build time and disk space.

Clang docs say that this is binary compatible in only one
direction, so our public C++ code shouldn't be using this,
as external C++ code could try to use exported inlines
that are no longer there.

Change-Id: Ie6217808f8ee4a15344183abfc65038e1558d1b0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/122352
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

config_host.mk.in

@@ -266,6 +266,7 @@ export HAMCREST_JAR=@HAMCREST_JAR@
 export HAVE_BROKEN_GCC_WMAYBE_UNINITIALIZED=@HAVE_BROKEN_GCC_WMAYBE_UNINITIALIZED@
 export HAVE_BROKEN_GCC_WSTRINGOP_OVERFLOW=@HAVE_BROKEN_GCC_WSTRINGOP_OVERFLOW@
 export HAVE_CLANG_DEBUG_INFO_KIND_CONSTRUCTOR=@HAVE_CLANG_DEBUG_INFO_KIND_CONSTRUCTOR@
+export HAVE_DLLEXPORTINLINES=@HAVE_DLLEXPORTINLINES@
 export HAVE_LO_CLANG_DLLEXPORTINLINES=@HAVE_LO_CLANG_DLLEXPORTINLINES@
 export HAVE_GCC_AVX=@HAVE_GCC_AVX@
 export HAVE_GCC_BUILTIN_ATOMIC=@HAVE_GCC_BUILTIN_ATOMIC@

configure.ac

@@ -7599,6 +7599,21 @@ if test "$GCC" = yes && test "$COM_IS_CLANG" != TRUE; then
 fi
 AC_SUBST([HAVE_BROKEN_GCC_WSTRINGOP_OVERFLOW])
 
+HAVE_DLLEXPORTINLINES=
+if test "$_os" = "WINNT"; then
+    AC_MSG_CHECKING([whether $CXX_BASE supports -Zc:dllexportInlines-])
+    AC_LANG_PUSH([C++])
+    save_CXXFLAGS=$CXXFLAGS
+    CXXFLAGS="$CXXFLAGS -Werror -Zc:dllexportInlines-"
+    AC_COMPILE_IFELSE([AC_LANG_SOURCE()], [
+            HAVE_DLLEXPORTINLINES=TRUE
+            AC_MSG_RESULT([yes])
+        ], [AC_MSG_RESULT([no])])
+    CXXFLAGS=$save_CXXFLAGS
+    AC_LANG_POP([C++])
+fi
+AC_SUBST([HAVE_DLLEXPORTINLINES])
+
 dnl ===================================================================
 dnl CPU Intrinsics support - SSE, AVX
 dnl ===================================================================

cppu/Library_cppu.mk

@@ -14,6 +14,8 @@ $(eval $(call gb_Library_set_soversion_script,cppu,$(SRCDIR)/cppu/util/cppu.map)
 
 $(eval $(call gb_Library_use_udk_api,cppu))
 
+$(eval $(call gb_Library_set_is_ure_library,cppu))
+
 $(eval $(call gb_Library_add_defs,cppu,\
 	-DCPPU_DLLIMPLEMENTATION \
 ))

cppu/Library_purpenvhelper.mk

@@ -16,6 +16,8 @@ $(eval $(call gb_Library_add_defs,purpenvhelper,\
 	-DPURPENV_DLLIMPLEMENTATION \
 ))
 
+$(eval $(call gb_Library_set_is_ure_library,purpenvhelper))
+
 $(eval $(call gb_Library_use_udk_api,purpenvhelper))
 
 $(eval $(call gb_Library_use_libraries,purpenvhelper,\

cppuhelper/Library_cppuhelper.mk

@@ -18,6 +18,8 @@ $(eval $(call gb_Library_use_internal_comprehensive_api,cppuhelper,\
 	offapi \
 ))
 
+$(eval $(call gb_Library_set_is_ure_library,cppuhelper))
+
 $(eval $(call gb_Library_add_defs,cppuhelper,\
 	-DCPPUHELPER_DLLIMPLEMENTATION \
 ))

sal/Library_sal.mk

@@ -14,6 +14,8 @@ $(eval $(call gb_Library_set_soversion_script,sal,$(SRCDIR)/sal/util/sal.map))
 
 $(eval $(call gb_Library_set_precompiled_header,sal,sal/inc/pch/precompiled_sal))
 
+$(eval $(call gb_Library_set_is_ure_library,sal))
+
 $(eval $(call gb_Library_set_include,sal,\
 	$$(INCLUDE) \
 	-I$(SRCDIR)/sal/inc \

salhelper/Library_salhelper.mk

@@ -14,6 +14,8 @@ $(eval $(call gb_Library_add_defs,salhelper,\
 	-DSALHELPER_DLLIMPLEMENTATION \
 ))
 
+$(eval $(call gb_Library_set_is_ure_library,salhelper))
+
 $(eval $(call gb_Library_use_libraries,salhelper,\
 	sal \
 ))

solenv/gbuild/Library.mk

@@ -252,5 +252,6 @@ gb_Library_use_clang = $(call gb_Library__forward_to_Linktarget,$(0),$(1),$(2),$
 gb_Library_set_clang_precompiled_header = $(call gb_Library__forward_to_Linktarget,$(0),$(1),$(2),$(3))
 gb_Library_use_glxtest = $(call gb_Library__forward_to_Linktarget,$(0),$(1),$(2),$(3))
 gb_Library_use_vclmain = $(call gb_Library__forward_to_Linktarget,$(0),$(1),$(2),$(3))
+gb_Library_set_is_ure_library = $(call gb_Library__forward_to_Linktarget,$(0),$(1),$(2),$(3))
 
 # vim: set noet sw=4:

solenv/gbuild/LinkTarget.mk

@@ -2010,4 +2010,15 @@ $(call gb_LinkTarget_use_static_libraries,$(1),vclmain)
 
 endef # gb_LinkTarget_use_vclmain
 
+# Used by URE libraries that need to keep binary compatibility.
+# Reset some flags that make sense for our internal libraries but might
+# break public ABI.
+# call gb_LinkTarget_set_is_ure_library,linktarget,,linktargetmakefilename
+define gb_LinkTarget_set_is_ure_library
+ifeq ($(HAVE_DLLEXPORTINLINES),TRUE)
+$(call gb_LinkTarget_add_cxxflags,$(1),-Zc:dllexportInlines)
+endif
+
+endef
+
 # vim: set noet sw=4:

solenv/gbuild/platform/com_MSC_class.mk

@@ -48,9 +48,10 @@ endef
 # Avoid annoying warning D9025 about overriding command-line arguments.
 gb_Helper_remove_overridden_flags = \
     $(lastword $(filter -W4 -w,$(1))) \
-    $(filter-out -W4 -w -arch:SSE -arch:SSE2 -arch:AVX -arch:AVX2 -Od -O2,$(1)) \
+    $(filter-out -W4 -w -arch:SSE -arch:SSE2 -arch:AVX -arch:AVX2 -Od -O2 -Zc:dllexportInlines -Zc:dllexportInlines-,$(1)) \
     $(lastword $(filter -Od -O2,$(1))) \
-    $(lastword $(filter -arch:SSE -arch:SSE2 -arch:AVX -arch:AVX2,$(1)))
+    $(lastword $(filter -arch:SSE -arch:SSE2 -arch:AVX -arch:AVX2,$(1))) \
+    $(lastword $(filter -Zc:dllexportInlines -Zc:dllexportInlines-,$(1)))
 
 # $(call gb_CObject__command_pattern,object,flags,source,dep-file,compiler-plugins,symbols,compiler)
 define gb_CObject__command_pattern

solenv/gbuild/platform/com_MSC_defs.mk

@@ -158,6 +158,10 @@ gb_CFLAGS += \
 
 endif
 
+ifeq ($(HAVE_DLLEXPORTINLINES),TRUE)
+gb_CXXFLAGS += -Zc:dllexportInlines-
+endif
+
 ifneq ($(COM_IS_CLANG),TRUE)
 
 # clang-cl doesn't support -Wv:18 for now