[build] Fix compilation when gcc is patched to default to -fPIE -Wl,-pie

Signed-off-by: Gilles Espinasse <g.esp@free.fr>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/Makefile.housekeeping b/src/Makefile.housekeeping
index 57e52c0f82f5379b6fe3f6a7c6fa10adb691c5a8..c184351d59e1823937266f9fb3dc971c201615e6 100644 (file)
--- a/src/Makefile.housekeeping
+++ b/src/Makefile.housekeeping
@@ -138,6 +138,17 @@ SP_FLAGS := $(shell $(SP_TEST) && $(ECHO) '-fno-stack-protector')
 WORKAROUND_CFLAGS += $(SP_FLAGS)
 endif
 
+# Some widespread patched versions of gcc include -fPIE -Wl,-pie by
+# default.  Note that gcc will exit *successfully* if it fails to
+# recognise an option that starts with "no", so we have to test for
+# output on stderr instead of checking the exit status.
+#
+ifeq ($(CCTYPE),gcc)
+PIE_TEST = [ -z "`$(CC) -fno-PIE -nopie -x c -c /dev/null -o /dev/null 2>&1`" ]
+PIE_FLAGS := $(shell $(PIE_TEST) && $(ECHO) '-fno-PIE -nopie')
+WORKAROUND_CFLAGS += $(PIE_FLAGS)
+endif
+
 # gcc 4.4 generates .eh_frame sections by default, which distort the
 # output of "size".  Inhibit this.
 #