Fix compilation on MacOS X

Enable "ld_preload" (DYLD_INSERT_LIBRARIES + DYLD_FORCE_FLAT_NAMESPACE)
and build cairo-trace as a library instead of a module to make it
work also on MacOS X.

configure.ac

@@ -651,12 +651,27 @@ AM_CONDITIONAL(BUILD_ANY2PPM,
 		 -o "x$any2ppm_ps"  = "xyes" \
 		 -o "x$any2ppm_cs"  = "xyes")
 
+dnl ===========================================================================
+dnl Some utilities need to dlopen the shared libraries, so they need to
+dnl know how libtools will name them
+
+case $host in
+*-*-darwin*)
+	SHLIB_EXT="dylib"
+	;;
+*)
+	SHLIB_EXT="so"
+	;;
+esac
+AC_DEFINE_UNQUOTED(SHARED_LIB_EXT, "${SHLIB_EXT}", [Shared library file extension])
+AC_SUBST(SHLIB_EXT)
+
 dnl ===========================================================================
 dnl The tracing utility requires LD_PRELOAD, so only build it for systems
 dnl that are known to work.
 
 case $host in
-*-linux*|*-*bsd*|*-solaris*)
+*-linux*|*-*bsd*|*-solaris*|*-*-darwin*)
 	have_ld_preload="yes"
 	;;
 *)

util/cairo-trace/Makefile.am

@@ -2,37 +2,37 @@ cairolibdir = $(libdir)/cairo
 cairooutdir = $(localstatedir)/lib/cairo-trace
 
 bin_SCRIPTS = cairo-trace
-cairolib_LTLIBRARIES = cairo-trace.la
+cairolib_LTLIBRARIES = libcairo-trace.la
 
 AM_CPPFLAGS = -I$(top_srcdir)/src \
 	      -I$(top_builddir)/src
 
-cairo_trace_la_SOURCES = trace.c
-cairo_trace_la_CPPFLAGS = -DCAIRO_TRACE_OUTDIR="\"$(cairooutdir)\"" \
+libcairo_trace_la_SOURCES = trace.c
+libcairo_trace_la_CPPFLAGS = -DCAIRO_TRACE_OUTDIR="\"$(cairooutdir)\"" \
 			  $(AM_CPPFLAGS)
-cairo_trace_la_CFLAGS = $(CAIRO_CFLAGS)
-cairo_trace_la_LDFLAGS = -module -no-undefined
+libcairo_trace_la_CFLAGS = $(CAIRO_CFLAGS)
+libcairo_trace_la_LDFLAGS = -no-undefined
 
-cairo_trace_la_LIBADD = -lz $(pthread_LIBS)
+libcairo_trace_la_LIBADD = -lz $(pthread_LIBS)
 if CAIRO_HAS_DL
-cairo_trace_la_LIBADD += -ldl
+libcairo_trace_la_LIBADD += -ldl
 endif
 
 if CAIRO_HAS_SYMBOL_LOOKUP
-cairo_trace_la_SOURCES += \
+libcairo_trace_la_SOURCES += \
 			 lookup-symbol.c \
 			 lookup-symbol.h
-cairo_trace_la_LIBADD += $(BFD_LIBS)
+libcairo_trace_la_LIBADD += $(BFD_LIBS)
 endif
 
 
 system-install: install
 	-mkdir -p $(cairooutdir)
 	-chmod 01777 $(cairooutdir)
-	grep -sq $(cairolibdir)/cairo-trace.so /etc/ld.so.preload || echo $(cairolibdir)/cairo-trace.so >> /etc/ld.so.preload
+	grep -sq $(cairolibdir)/libcairo-trace.so /etc/ld.so.preload || echo $(cairolibdir)/libcairo-trace.so >> /etc/ld.so.preload
 
 system-uninstall: uninstall
-	sed -e '/cairo-trace.so/d' < /etc/ld.so.preload > /tmp/ld.so.preload && mv /tmp/ld.so.preload /etc/ld.so.preload;
+	sed -e '/libcairo-trace.so/d' < /etc/ld.so.preload > /tmp/ld.so.preload && mv /tmp/ld.so.preload /etc/ld.so.preload;
 
 EXTRA_DIST = \
 	COPYING \

util/cairo-trace/cairo-trace.in

@@ -90,7 +90,7 @@ export CAIRO_TRACE_PROG_NAME
 
 if test "x$CAIRO_TRACE_SO" = "x"; then
     CAIRO_TRACE_SO=""
-    for lib in @libdir@/cairo/cairo-trace.so @libdir@/cairo/cairo-trace.so*; do
+    for lib in @libdir@/cairo/libcairo-trace.@SHLIB_EXT@ @libdir@/cairo/libcairo-trace.@SHLIB_EXT@* @libdir@/cairo/libcairo-trace.*.@SHLIB_EXT@ ; do
 	if test -h "$lib" -o -f "$lib"; then
 	    CAIRO_TRACE_SO="$lib"
 	    break
@@ -104,7 +104,11 @@ if test "x$CAIRO_TRACE_SO" = "x"; then
 fi
 
 LD_PRELOAD="$CAIRO_TRACE_SO"
+DYLD_INSERT_LIBRARIES="$CAIRO_TRACE_SO"
+DYLD_FORCE_FLAT_NAMESPACE=1
 export LD_PRELOAD
+export DYLD_INSERT_LIBRARIES
+export DYLD_FORCE_FLAT_NAMESPACE
 
 if test -n "$nocallers"; then
     CAIRO_TRACE_LINE_INFO=0

util/cairo-trace/trace.c

@@ -95,7 +95,7 @@ static void *_dlhandle = RTLD_NEXT;
     if (name##_real == NULL) { \
 	name##_real = (typeof (&name))(dlsym (_dlhandle, #name));	\
 	if (name##_real == NULL && _dlhandle == RTLD_NEXT) { \
-	    _dlhandle = dlopen ("libcairo.so", RTLD_LAZY); \
+	    _dlhandle = dlopen ("libcairo." SHARED_LIB_EXT, RTLD_LAZY); \
 	    name##_real = (typeof (&name))(dlsym (_dlhandle, #name));	\
 	    assert (name##_real != NULL); \
 	} \