NixOS is designed to have immutable packages, and explicit dependencies. It allows multiple different versions of the same shared library to co-exist in its file system. Each application built with Nix, the NixOS package manager, will have paths to its dependency shared libraries hardcoded into its executable, this includes the dynamic linker. To achieve this, Nix adds a --dynamic-linker linker flag when building any application. This isn't a problem if the kernel is built with ld.bfd, because ld.bfd ignores the --dynamic-linker flag when the resulting binary doesn't have a DT_NEEDED entry. However, ld.lld respects --dynamic-linker unconditionally, which breaks linking in several cases. This commit adds an explicit --no-dynamic-linker flag which overrides the flag added by Nix. Signed-off-by: Yuxuan Shui <yshuiv7@xxxxxxxxx> --- Makefile | 3 +++ arch/x86/boot/Makefile | 2 +- arch/x86/realmode/rm/Makefile | 2 +- 3 files changed, 5 insertions(+), 2 deletions(-) diff --git a/Makefile b/Makefile index a171eafce2a3b..10ed19caecb1b 100644 --- a/Makefile +++ b/Makefile @@ -531,6 +531,9 @@ RUSTFLAGS_KERNEL = AFLAGS_KERNEL = LDFLAGS_vmlinux = +LDFLAGS_MODULE += --no-dynamic-linker +LDFLAGS_vmlinux += --no-dynamic-linker + # Use USERINCLUDE when you must reference the UAPI directories only. USERINCLUDE := \ -I$(srctree)/arch/$(SRCARCH)/include/uapi \ diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile index 3cece19b74732..390a4604166eb 100644 --- a/arch/x86/boot/Makefile +++ b/arch/x86/boot/Makefile @@ -102,7 +102,7 @@ $(obj)/zoffset.h: $(obj)/compressed/vmlinux FORCE AFLAGS_header.o += -I$(objtree)/$(obj) $(obj)/header.o: $(obj)/zoffset.h -LDFLAGS_setup.elf := -m elf_i386 -z noexecstack -T +LDFLAGS_setup.elf := --no-dynamic-linker -m elf_i386 -z noexecstack -T $(obj)/setup.elf: $(src)/setup.ld $(SETUP_OBJS) FORCE $(call if_changed,ld) diff --git a/arch/x86/realmode/rm/Makefile b/arch/x86/realmode/rm/Makefile index f614009d3e4e2..4b42006d9ce02 100644 --- a/arch/x86/realmode/rm/Makefile +++ b/arch/x86/realmode/rm/Makefile @@ -50,7 +50,7 @@ $(obj)/pasyms.h: $(REALMODE_OBJS) FORCE targets += realmode.lds $(obj)/realmode.lds: $(obj)/pasyms.h -LDFLAGS_realmode.elf := -m elf_i386 --emit-relocs -T +LDFLAGS_realmode.elf := --no-dynamic-linker -m elf_i386 --emit-relocs -T CPPFLAGS_realmode.lds += -P -C -I$(objtree)/$(obj) targets += realmode.elf -- 2.43.0
