Improve avoiding C++ linkage, definition creation and cmake tests (#710)

.circleci/config.yml

@@ -25,7 +25,7 @@ jobs:
       - image: base/devel
     steps:
       - checkout
-      - run: pacman --noconfirm -Syu freetype2 cairo icu gettext gobject-introspection gcc gcc-libs glib2 graphite pkg-config ragel
+      - run: pacman --noconfirm -Syu freetype2 cairo icu gettext gobject-introspection gcc gcc-libs glib2 graphite pkg-config ragel python
       - run: ./autogen.sh --with-freetype --with-glib --with-gobject --with-cairo --with-icu --with-graphite2
       - run: make && (make check || (cat `find -name '*.log'` && false))
 
@@ -34,7 +34,7 @@ jobs:
       - image: fedora
     steps:
       - checkout
-      - run: dnf install -y pkg-config ragel gcc gcc-c++ automake autoconf libtool make which glib2-devel freetype-devel cairo-devel libicu-devel gobject-introspection-devel graphite2-devel redhat-rpm-config || true
+      - run: dnf install -y pkg-config ragel gcc gcc-c++ automake autoconf libtool make which glib2-devel freetype-devel cairo-devel libicu-devel gobject-introspection-devel graphite2-devel redhat-rpm-config python || true
       - run: NOCONFIGURE=1 ./autogen.sh --with-freetype --with-glib --with-gobject --with-cairo --with-icu --with-graphite2
       - run: mkdir build && cd build && ../configure && make && (make check || (cat `find -name '*.log'` && false))
 

CMakeLists.txt

@@ -127,7 +127,7 @@ if (BUILD_SHARED_LIBS)
     add_definitions("-DHB_EXTERN=__declspec(dllexport) extern")
   else ()
     set (CMAKE_CXX_FLAGS "-fvisibility=hidden ${CMAKE_CXX_FLAGS}")
-    set (CMAKE_C_FLAGS "-fvisibility=hidden ${CMAKE_CXX_FLAGS}")
+    set (CMAKE_C_FLAGS "-fvisibility=hidden ${CMAKE_C_FLAGS}")
     add_definitions("-DHB_EXTERN=__attribute__((visibility(\"default\"))) extern")
   endif ()
 endif ()
@@ -524,11 +524,19 @@ if (UNIX OR MINGW)
   link_libraries(-Bsymbolic-functions)
 
   # Make sure we don't link to libstdc++
-  set (CMAKE_CXX_FLAGS "-fno-rtti -fno-exceptions ${CMAKE_CXX_FLAGS}")
-  if (NOT APPLE)
-    set (CMAKE_CXX_IMPLICIT_LINK_LIBRARIES "")
-    set (CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES "")
-    set_target_properties(harfbuzz PROPERTIES LINKER_LANGUAGE C)
+  if (BUILD_SHARED_LIBS AND (
+    CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR
+    CMAKE_CXX_COMPILER_ID STREQUAL "GNU"
+  ))
+    set (CMAKE_CXX_FLAGS "-fno-rtti -fno-exceptions ${CMAKE_CXX_FLAGS}")
+  endif ()
+  set (CMAKE_CXX_IMPLICIT_LINK_LIBRARIES "")
+  set (CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES "")
+  set_target_properties(harfbuzz PROPERTIES LINKER_LANGUAGE C)
+
+  # No threadsafe statics as we do it ourselves
+  if (BUILD_SHARED_LIBS)
+    set (CMAKE_CXX_FLAGS "-fno-threadsafe-statics ${CMAKE_CXX_FLAGS}")
   endif ()
 endif ()
 
@@ -782,22 +790,20 @@ endif ()
 ## Tests
 if (UNIX OR MINGW)
   if (BUILD_SHARED_LIBS)
-    # does some "make" stuff inside
-    #add_test(NAME check-defs.sh COMMAND ${PROJECT_SOURCE_DIR}/src/check-defs.sh)
-    #set_tests_properties(check-defs.sh PROPERTIES ENVIRONMENT "libs=.")
+    string(REPLACE ";" " " space_separated_headers "${project_headers}")  
+    add_custom_command(TARGET harfbuzz POST_BUILD
+      COMMAND ${CMAKE_COMMAND} -E env "headers=${space_separated_headers}" python ${PROJECT_SOURCE_DIR}/src/gen-def.py ${PROJECT_BINARY_DIR}/harfbuzz.def
+      WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/src)
 
     add_test(NAME check-symbols.sh COMMAND ${PROJECT_SOURCE_DIR}/src/check-symbols.sh)
-    set_tests_properties(check-symbols.sh PROPERTIES ENVIRONMENT "libs=.")
-
-    if (NOT APPLE)
-      add_test(NAME check-libstdc++.sh COMMAND ${PROJECT_SOURCE_DIR}/src/check-libstdc++.sh)
-      add_test(NAME check-static-inits.sh
-        COMMAND ${PROJECT_SOURCE_DIR}/src/check-static-inits.sh
-        WORKING_DIRECTORY ${PROJECT_BINARY_DIR}/CMakeFiles/harfbuzz.dir/src # ugly hack
-      )
-      set_tests_properties(check-libstdc++.sh check-static-inits.sh
-        PROPERTIES ENVIRONMENT "libs=.")
-    endif ()
+    add_test(NAME check-static-inits.sh
+      COMMAND ${PROJECT_SOURCE_DIR}/src/check-static-inits.sh
+      WORKING_DIRECTORY ${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/harfbuzz.dir/src # ugly hack
+    )
+    add_test(NAME check-libstdc++.sh COMMAND ${PROJECT_SOURCE_DIR}/src/check-libstdc++.sh)
+    add_test(NAME check-defs.sh COMMAND ${PROJECT_SOURCE_DIR}/src/check-defs.sh)
+    set_tests_properties(check-symbols.sh check-static-inits.sh check-libstdc++.sh check-defs.sh
+      PROPERTIES ENVIRONMENT "libs=.;srcdir=${PROJECT_SOURCE_DIR}/src")
   endif ()
 
   add_test(NAME check-c-linkage-decls.sh COMMAND ./check-c-linkage-decls.sh)

configure.ac

@@ -83,6 +83,9 @@ if test "x$GCC" = "xyes"; then
 	# Make sure we don't link to libstdc++
 	CXXFLAGS="$CXXFLAGS -fno-rtti -fno-exceptions"
 
+	# No threadsafe statics and C++ as we do it ourselves
+	CXXFLAGS="$CXXFLAGS -fno-threadsafe-statics"
+
 	# Assorted warnings
 	CXXFLAGS="$CXXFLAGS -Wcast-align"
 

src/Makefile.am

@@ -223,21 +223,14 @@ CLEANFILES += $(pkgconfig_DATA)
 
 CLEANFILES += harfbuzz.def
 harfbuzz.def: $(HBHEADERS) $(HBNODISTHEADERS)
-	$(AM_V_GEN) (echo EXPORTS; \
-	(cat $^ || echo 'hb_ERROR ()' ) | \
-	$(EGREP) '^hb_.* \(' | \
-	sed -e 's/ (.*//' | \
-	LC_ALL=C sort; \
-	echo LIBRARY libharfbuzz-0.dll; \
-	) >"$@"
-	@ ! grep -q hb_ERROR "$@" \
-	|| ($(RM) "$@"; false)
+	$(AM_V_GEN) headers="$^" $(srcdir)/gen-def.py $@
 
 
 GENERATORS = \
 	gen-arabic-table.py \
 	gen-indic-table.py \
 	gen-use-table.py \
+	gen-def.py \
 	$(NULL)
 EXTRA_DIST += $(GENERATORS)
 

src/check-defs.sh

@@ -5,7 +5,6 @@ export LC_ALL
 
 test -z "$srcdir" && srcdir=.
 test -z "$libs" && libs=.libs
-test -z "$MAKE" && MAKE=make
 stat=0
 
 if which nm 2>/dev/null >/dev/null; then
@@ -16,26 +15,36 @@ else
 fi
 
 defs="harfbuzz.def"
-$MAKE $defs > /dev/null
+if ! test -f "$defs"; then
+	echo "check-defs.sh: '$defs' not found; skipping test"
+	exit 77
+fi
+
 tested=false
 for def in $defs; do
 	lib=`echo "$def" | sed 's/[.]def$//;s@.*/@@'`
-	so=$libs/lib${lib}.so
+	for suffix in so dylib; do
+		so=$libs/lib${lib}.$suffix
+		if ! test -f "$so"; then continue; fi
+
+		EXPORTED_SYMBOLS="`nm "$so" | grep ' [BCDGINRSTVW] .' | grep -v ' _fini\>\| _init\>\| _fdata\>\| _ftext\>\| _fbss\>\| __bss_start\>\| __bss_start__\>\| __bss_end__\>\| _edata\>\| _end\>\| _bss_end__\>\| __end__\>\| __gcov_flush\>\| llvm_' | cut -d' ' -f3`"
 
-	EXPORTED_SYMBOLS="`nm "$so" | grep ' [BCDGINRSTVW] .' | grep -v ' _fini\>\| _init\>\| _fdata\>\| _ftext\>\| _fbss\>\| __bss_start\>\| __bss_start__\>\| __bss_end__\>\| _edata\>\| _end\>\| _bss_end__\>\| __end__\>\| __gcov_flush\>\| llvm_' | cut -d' ' -f3`"
+		# On mac, C symbols are prefixed with _
+		if test $suffix = dylib; then prefix="_"; fi
 
-	if test -f "$so"; then
+		if test -f "$so"; then
 
-		echo "Checking that $so has the same symbol list as $def"
-		{
-			echo EXPORTS
-			echo "$EXPORTED_SYMBOLS"
-			# cheat: copy the last line from the def file!
-			tail -n1 "$def"
-		} | diff "$def" - >&2 || stat=1
+			echo "Checking that $so has the same symbol list as $def"
+			{
+				echo EXPORTS
+				echo "$EXPORTED_SYMBOLS" | sed -e "s/^${prefix}hb/hb/g"
+				# cheat: copy the last line from the def file!
+				tail -n1 "$def"
+			} | diff "$def" - >&2 || stat=1
 
-		tested=true
-	fi
+			tested=true
+		fi
+	done
 done
 if ! $tested; then
 	echo "check-defs.sh: libharfbuzz shared library not found; skipping test"

src/gen-def.py

+#!/usr/bin/env python
+
+from __future__ import print_function
+
+import io, os, re, sys
+
+headers_content = []
+for h in os.environ["headers"].split (' '):
+	if h.endswith (".h"):
+		with io.open(h, encoding='utf8') as f: headers_content.append (f.read ())
+
+result = ("EXPORTS\n" +
+	"\n".join (sorted (re.findall (r"^hb_\w+(?= \()", "\n".join (headers_content), re.M))) +
+	"\nLIBRARY libharfbuzz-0.dll")
+
+with open (sys.argv[1], "w") as f: f.write (result)