Nathan Chancellor 7f3d349065 riscv: Use $(LD) instead of $(CC) to link vDSO ... Currently, the VDSO is being linked through $(CC). This does not match how the rest of the kernel links objects, which is through the $(LD) variable. When linking with clang, there are a couple of warnings about flags that will not be used during the link: clang-12: warning: argument unused during compilation: '-no-pie' [-Wunused-command-line-argument] clang-12: warning: argument unused during compilation: '-pg' [-Wunused-command-line-argument] '-no-pie' was added in commit 85602bea29 ("RISC-V: build vdso-dummy.o with -no-pie") to override '-pie' getting added to the ld command from distribution versions of GCC that enable PIE by default. It is technically no longer needed after commit c2c81bb2f6 ("RISC-V: Fix the VDSO symbol generaton for binutils-2.35+"), which removed vdso-dummy.o in favor of generating vdso-syms.S from vdso.so with $(NM) but this also resolves the issue in case it ever comes back due to having full control over the $(LD) command. '-pg' is for function tracing, it is not used during linking as clang states. These flags could be removed/filtered to fix the warnings but it is easier to just match the rest of the kernel and use $(LD) directly for linking. See commits fe00e50b2d ("ARM: 8858/1: vdso: use $(LD) instead of $(CC) to link VDSO") 691efbedc6 ("arm64: vdso: use $(LD) instead of $(CC) to link VDSO") 2ff906994b ("MIPS: VDSO: Use $(LD) instead of $(CC) to link VDSO") 2b2a25845d ("s390/vdso: Use $(LD) instead of $(CC) to link vDSO") for more information. The flags are converted to linker flags and '--eh-frame-hdr' is added to match what is added by GCC implicitly, which can be seen by adding '-v' to GCC's invocation. Additionally, since this area is being modified, use the $(OBJCOPY) variable instead of an open coded $(CROSS_COMPILE)objcopy so that the user's choice of objcopy binary is respected. Link: https://github.com/ClangBuiltLinux/linux/issues/803 Link: https://github.com/ClangBuiltLinux/linux/issues/970 Signed-off-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Fangrui Song <maskray@google.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>		2021-04-26 08:24:59 -07:00
..
boot	RISC-V Patches for the 5.12 Merge Window	2021-02-26 10:28:35 -08:00
configs	RISC-V: Enable CPU Hotplug in defconfigs	2021-02-26 21:24:02 -08:00
errata	riscv: sifive: Apply errata "cip-1200" patch	2021-04-26 08:24:58 -07:00
include	riscv: sifive: Apply errata "cip-1200" patch	2021-04-26 08:24:58 -07:00
kernel	riscv: Use $(LD) instead of $(CC) to link vDSO	2021-04-26 08:24:59 -07:00
lib	riscv: Add support for function error injection	2021-01-14 15:09:09 -08:00
mm	riscv: Cleanup KASAN_VMALLOC support	2021-03-29 23:13:29 -07:00
net	bpf: Rename BPF_XADD and prepare to encode other atomics in .imm	2021-01-14 18:34:29 -08:00
Kbuild	riscv: Allow device trees to be built into the kernel	2020-05-18 11:38:05 -07:00
Kconfig	riscv: Introduce alternative mechanism to apply errata solution	2021-04-26 08:24:55 -07:00
Kconfig.debug	RISC-V: Remove EARLY_PRINTK support	2018-12-17 10:23:46 -08:00
Kconfig.erratas	riscv: sifive: Apply errata "cip-1200" patch	2021-04-26 08:24:58 -07:00
Kconfig.socs	riscv: sifive: Add SiFive alternative ports	2021-04-26 08:24:56 -07:00
Makefile	riscv: Introduce alternative mechanism to apply errata solution	2021-04-26 08:24:55 -07:00