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
..
.gitignore	RISC-V: Fix the VDSO symbol generaton for binutils-2.35+	2020-11-06 00:03:48 -08:00
flush_icache.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286	2019-06-05 17:36:37 +02:00
getcpu.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286	2019-06-05 17:36:37 +02:00
Makefile	riscv: Use $(LD) instead of $(CC) to link vDSO	2021-04-26 08:24:59 -07:00
note.S	riscv: add Linux note to vdso	2020-05-04 14:22:34 -07:00
rt_sigreturn.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286	2019-06-05 17:36:37 +02:00
so2s.sh	RISC-V: Fix the VDSO symbol generaton for binutils-2.35+	2020-11-06 00:03:48 -08:00
vdso.lds.S	riscv: use vDSO common flow to reduce the latency of the time-related functions	2020-06-10 19:47:16 -07:00
vdso.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 286	2019-06-05 17:36:37 +02:00
vgettimeofday.c	riscv: Add extern declarations for vDSO time-related functions	2020-06-25 15:15:51 -07:00