lib-ksyms.o is created by linking an empty input file with a linker script containing the interesting bits. Currently the empty input file is an archive containing nothing, however this causes the gold linker to segfault. I have opened a bug against gold https://sourceware.org/bugzilla/show_bug.cgi?id=20767 However this can be worked around by assembling an empty file to link with instead. The resulting lib-ksyms.o is slightly larger (seemingly due to empty .text, .data, .bss setions added), but final linked output should not be changed.
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| @@ -424,7 +424,7 @@ quiet_cmd_export_list = EXPORTS $@ · 423 unmodified lines | |||
| 424 | cmd_export_list = $(OBJDUMP) -h $< | \ | 424 | cmd_export_list = $(OBJDUMP) -h $< | \ |
| 425 | sed -ne '/___ksymtab/{s/.*+/$(ref_prefix)/;s/ .*/)/;p}' >$(ksyms-lds);\ | 425 | sed -ne '/___ksymtab/{s/.*+/$(ref_prefix)/;s/ .*/)/;p}' >$(ksyms-lds);\ |
| 426 | rm -f $(dummy-object);\ | 426 | rm -f $(dummy-object);\ |
| 427 | $(AR) rcs$(KBUILD_ARFLAGS) $(dummy-object);\ | 427 | echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\ |
| 428 | $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\ | 428 | $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\ |
| 429 | rm $(dummy-object) $(ksyms-lds) | 429 | rm $(dummy-object) $(ksyms-lds) |
| 430 | 430 | ||