[build] Use separate code segment if supported by linker
Some versions of ld will complain that the automatically created (and
unused by our build process) ELF program headers include a "LOAD
segment with RWX permissions".
Silence this warning by adding "-z separate-code" to the linker
options, where supported.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
diff --git a/src/Makefile.housekeeping b/src/Makefile.housekeeping
index b32003e..061844e 100644
--- a/src/Makefile.housekeeping
+++ b/src/Makefile.housekeeping
@@ -502,6 +502,13 @@
#
LDFLAGS += -static
+# Use separate code segment if supported by linker
+#
+ZSC_TEST = [ -z "`$(LD) -z separate-code --version 2>&1 > /dev/null`" ]
+ZSC_FLAGS := $(shell $(ZSC_TEST) && \
+ $(ECHO) '-z separate-code -z max-page-size=4096')
+LDFLAGS += $(ZSC_FLAGS)
+
# compiler.h is needed for our linking and debugging system
#
CFLAGS += -include include/compiler.h
