Link shared druntime library and test runner against lib[std]c++

Author: kinke

posix.mak

@@ -63,6 +63,10 @@ SHARED=$(if $(findstring $(OS),linux freebsd dragonflybsd),1,)
 
 LINKDL=$(if $(findstring $(OS),linux),-L-ldl,)
 
+# link shared libraries and test runner executables against the C++ runtime library,
+# for the core.stdcpp.* bindings
+LINKCXX=$(if $(findstring $(OS),osx),-L-lc++,-L-lstdc++)
+
 MAKEFILE = $(firstword $(MAKEFILE_LIST))
 
 DDOCFLAGS=-conf= -c -w -o- -Isrc -Iimport -version=CoreDdoc
@@ -245,7 +249,7 @@ $(DRUNTIMESO) $(DRUNTIMESOLIB) dll: DFLAGS+=-version=Shared -fPIC
 dll: $(DRUNTIMESOLIB)
 
 $(DRUNTIMESO): $(OBJS) $(SRCS) $(DMD)
-	$(DMD) -shared -debuglib= -defaultlib= -of$(DRUNTIMESO) $(DFLAGS) $(SRCS) $(OBJS) $(LINKDL) -L-lpthread -L-lm
+	$(DMD) -shared -debuglib= -defaultlib= -of$(DRUNTIMESO) $(DFLAGS) $(SRCS) $(OBJS) $(LINKDL) $(LINKCXX) -L-lpthread -L-lm
 
 $(DRUNTIMESOLIB): $(OBJS) $(SRCS) $(DMD)
 	$(DMD) -c -fPIC -of$(DRUNTIMESOOBJ) $(DFLAGS) $(SRCS)
@@ -296,15 +300,15 @@ $(addprefix $(ROOT)/unittest/,$(DISABLED_TESTS)) :
 ifeq (,$(SHARED))
 
 $(ROOT)/unittest/test_runner: $(OBJS) $(SRCS) src/test_runner.d $(DMD)
-	$(DMD) $(UDFLAGS) $(UTFLAGS) -of$@ src/test_runner.d $(SRCS) $(OBJS) -debuglib= -defaultlib= -L-lpthread -L-lm
+	$(DMD) $(UDFLAGS) $(UTFLAGS) -of$@ src/test_runner.d $(SRCS) $(OBJS) -debuglib= -defaultlib= $(LINKCXX) -L-lpthread -L-lm
 
 else
 
 UT_DRUNTIME:=$(ROOT)/unittest/libdruntime-ut$(DOTDLL)
 
 $(UT_DRUNTIME): UDFLAGS+=-version=Shared -fPIC
 $(UT_DRUNTIME): $(OBJS) $(SRCS) $(DMD)
-	$(DMD) $(UDFLAGS) -shared $(UTFLAGS) -of$@ $(SRCS) $(OBJS) $(LINKDL) -debuglib= -defaultlib= -L-lpthread -L-lm
+	$(DMD) $(UDFLAGS) -shared $(UTFLAGS) -of$@ $(SRCS) $(OBJS) $(LINKDL) -debuglib= -defaultlib= $(LINKCXX) -L-lpthread -L-lm
 
 $(ROOT)/unittest/test_runner: $(UT_DRUNTIME) src/test_runner.d $(DMD)
 	$(DMD) $(UDFLAGS) -of$@ src/test_runner.d -L$(UT_DRUNTIME) -debuglib= -defaultlib= -L-lpthread -L-lm