Accepting ET_EXEC as an input file is an extremely rare GNU ld feature
that lld does not intend to support, because this is error-prone.
See Linux kernel commit 90ceddcb495008ac8ba7a3dce297841efcd7d584 for
another use of the dd trick.
--
Changes v1 -> v2
* Add status=none to the dd command line. This suppresses dd's stderr output.
* Move dd command to a separate command
Signed-off-by: Fangrui Song <mask...@google.com>
---
Makefile | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/Makefile b/Makefile
index 5f7d537..118dec0 100644
--- a/Makefile
+++ b/Makefile
@@ -177,10 +177,14 @@ $(OUT)romlayout32seg.lds $(OUT)romlayout32flat.lds
$(OUT)code32flat.o $(OUT)code
$(OUT)rom16.o: $(OUT)code16.o $(OUT)romlayout16.lds
@echo " Linking $@"
$(Q)$(LD) -T $(OUT)romlayout16.lds $< -o $@
+ # Change e_type to ET_REL so that it can be used to link rom.o.
+ # Unlike GNU ld, lld does not allow an ET_EXEC input.
+ printf '\1' | dd of=$@ conv=notrunc bs=1 seek=16 status=none
$(OUT)rom32seg.o: $(OUT)code32seg.o $(OUT)romlayout32seg.lds
@echo " Linking $@"
$(Q)$(LD) -T $(OUT)romlayout32seg.lds $< -o $@
+ printf '\1' | dd of=$@ conv=notrunc bs=1 seek=16 status=none
$(OUT)rom.o: $(OUT)rom16.strip.o $(OUT)rom32seg.strip.o $(OUT)code32flat.o
$(OUT)romlayout32flat.lds
@echo " Linking $@"
--
2.26.0.rc2.310.g2932bb562d-goog
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