[Xen-devel] [PATCH v2] rombios: prevent building with PIC/PIE

[Olaf Hering <olaf@xxxxxxxxx>]

If the default compiler silently defaults to to -fPIC/-fPIE building
rombios fails:

 ld -melf_i386 -s -r 32bitbios.o tcgbios/tcgbiosext.o util.o pmm.o -o 
32bitbios_all.o
 There are undefined symbols in the BIOS:
          U _GLOBAL_OFFSET_TABLE_
 make[10]: *** [Makefile:26: 32bitbios_all.o] Error 11

Prevent the failure by enforcing non-PIC/PIE mode.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
---

build tested with staging-4.9/staging.

PIE is the default now in openSUSE Tumbleweed:
https://lists.opensuse.org/opensuse-factory/2017-06/msg00403.html

 tools/firmware/rombios/32bit/Makefile         | 2 ++
 tools/firmware/rombios/32bit/tcgbios/Makefile | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/tools/firmware/rombios/32bit/Makefile 
b/tools/firmware/rombios/32bit/Makefile
index b0583c93df..28c15444ae 100644
--- a/tools/firmware/rombios/32bit/Makefile
+++ b/tools/firmware/rombios/32bit/Makefile
@@ -4,6 +4,8 @@ include $(XEN_ROOT)/tools/firmware/Rules.mk
 TARGET = 32bitbios_flat.h
 
 CFLAGS += $(CFLAGS_xeninclude) -I.. -I../../../libacpi
+$(call cc-option-add,CFLAGS,CC,-fno-pic)
+$(call cc-option-add,CFLAGS,CC,-fno-PIE)
 
 SUBDIRS = tcgbios
 
diff --git a/tools/firmware/rombios/32bit/tcgbios/Makefile 
b/tools/firmware/rombios/32bit/tcgbios/Makefile
index f87d13020f..5cff4efc60 100644
--- a/tools/firmware/rombios/32bit/tcgbios/Makefile
+++ b/tools/firmware/rombios/32bit/tcgbios/Makefile
@@ -4,6 +4,8 @@ include $(XEN_ROOT)/tools/firmware/Rules.mk
 TARGET  = tcgbiosext.o
 
 CFLAGS += $(CFLAGS_xeninclude) -I.. -I../.. -I../../../../libacpi
+$(call cc-option-add,CFLAGS,CC,-fno-pic)
+$(call cc-option-add,CFLAGS,CC,-fno-PIE)
 
 .PHONY: all
 all: $(TARGET)

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel