[SeaBIOS] [PATCH RFC 1/7] Only use -fomit-frame-pointer with 32bit flat code

[Julian Pidancet]

The real-mode emulator that Windows 7 uses to execute the vga bios rom
becomes very confused when the code tries to dereference the stack
pointer instead of using the frame pointer, leading to corruption of
parameters passed on the stack from one function to another.

Signed-off-by: Julian Pidancet <julian.pidancet at gmail.com>
---
 Makefile |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index c3ba2f3..cb00958 100644
--- a/Makefile
+++ b/Makefile
@@ -32,14 +32,14 @@ COMMONCFLAGS = -I$(OUT) -Os -MD \
                $(call cc-option,$(CC),-Wtype-limits,) \
                -m32 -march=i386 -mregparm=3 -mpreferred-stack-boundary=2 \
                -mrtd -minline-all-stringops \
-               -freg-struct-return -ffreestanding -fomit-frame-pointer \
+               -freg-struct-return -ffreestanding \
                -fno-delete-null-pointer-checks \
                -ffunction-sections -fdata-sections -fno-common
 COMMONCFLAGS += $(call cc-option,$(CC),-nopie,)
 COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector,)
 COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector-all,)
 
-CFLAGS32FLAT = $(COMMONCFLAGS) -g -DMODE16=0 -DMODESEGMENT=0
+CFLAGS32FLAT = $(COMMONCFLAGS) -fomit-frame-pointer -g -DMODE16=0 -DMODESEGMENT=0
 CFLAGSSEG = $(COMMONCFLAGS) -DMODESEGMENT=1 -fno-defer-pop \
             $(call cc-option,$(CC),-fno-jump-tables,-DMANUAL_NO_JUMP_TABLE) \
             $(call cc-option,$(CC),-fno-tree-switch-conversion,)
-- 
Julian Pidancet