Merge pull request #197 from lhoward/lhoward/SR-404

[SR-404]: use linker script to export protocol conformances start

Author: phausler

build.py

@@ -15,7 +15,8 @@
 
 if Configuration.current.target.sdk == OSType.Linux:
 	foundation.CFLAGS = '-DDEPLOYMENT_TARGET_LINUX -D_GNU_SOURCE '
-	foundation.LDFLAGS = '-Wl,@./CoreFoundation/linux.ld -lswiftGlibc `icu-config --ldflags` -Wl,-defsym,__CFConstantStringClassReference=_TMC10Foundation19_NSCFConstantString '
+	foundation.LDFLAGS = '-Wl,@./CoreFoundation/linux.ld -Xlinker -T ${SDKROOT}/lib/swift/linux/${ARCH}/swift.ld -lswiftGlibc `icu-config --ldflags` -Wl,-defsym,__CFConstantStringClassReference=_TMC10Foundation19_NSCFConstantString '
+
 elif Configuration.current.target.sdk == OSType.FreeBSD:
 	foundation.CFLAGS = '-DDEPLOYMENT_TARGET_FREEBSD -I/usr/local/include -I/usr/local/include/libxml2 '
 	foundation.LDFLAGS = ''