On 2/8/22 22:19, Vineet Gupta wrote:
When doing RV qemu builds with host gcc 11.2, ran into following build failure
| cc -MMD -MP -MT linuxboot_dma.o -MF ./linuxboot_dma.d -O2 -g -march=i486
-Wall \
| -Wstrict-prototypes -Wredundant-decls -Wundef -Wwrite-strings
-Wmissing-prototypes \
| -Wold-style-declaration -Wold-style-definition -Wtype-limits
-Wformat-security \
| -Wformat-y2k -Winit-self -Wignored-qualifiers -Wempty-body -Wnested-externs
\
| -Wendif-labels -Wexpansion-to-defined -Wimplicit-fallthrough=2
-Wno-missing-include-dirs \
| -Wno-shift-negative-value -Wno-psabi -fno-pie -ffreestanding -IQEMU/include
\
| -fno-stack-protector -m16 -Wa,-32 \
| -c QEMU/pc-bios/optionrom/linuxboot_dma.c -o linuxboot_dma.o
|cc1: error: ‘-fcf-protection’ is not compatible with this target
Signed-off-by: Vineet Gupta <vine...@rivosinc.com>
---
This might be a crude fix to the problem
---
pc-bios/optionrom/Makefile | 3 +++
1 file changed, 3 insertions(+)
diff --git a/pc-bios/optionrom/Makefile b/pc-bios/optionrom/Makefile
index 5d55d25acca2..8f843ee803c1 100644
--- a/pc-bios/optionrom/Makefile
+++ b/pc-bios/optionrom/Makefile
@@ -22,6 +22,9 @@ override CFLAGS += $(CFLAGS_NOPIE) -ffreestanding
-I$(TOPSRC_DIR)/include
override CFLAGS += $(call cc-option, -fno-stack-protector)
override CFLAGS += $(call cc-option, -m16)
+# issue with gcc 11.2
+override CFLAGS += $(call cc-option, -fcf-protection=none)
+
ifeq ($(filter -m16, $(CFLAGS)),)
# Attempt to work around compilers that lack -m16 (GCC <= 4.8, clang <= ??)
# On GCC we add -fno-toplevel-reorder to keep the order of asm blocks with
This is a problem in the Ubuntu compiler that you're using. If
-fcf-protection is not compatible with -m16, Ubuntu should not enable it
instead of breaking -m16.
Besides, QEMU is not at all compatible with -fcf-protection, not just
the ROMs. So it should be added to QEMU_CFLAGS in configure as well.
Paolo
