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RISC-V: Re-enable -msave-restore for shared libraries.

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This re-enables -msave-restore for shared libraries, and uses the
t-slibgcc-libgcc file to get the save-restore routines included directly
in shared libraries so that we don't need to indirect through the PLT
to reach them, which doesn't work.

	gcc/
	* config/riscv/riscv.c (riscv_option_override): Revert 2019-08-30
	change.

	libgcc/
	* config.host (riscv*-*-linux*): Add t-slibgcc-libgcc to tmake_file.
	(riscv*-*-freebsd*): Likewise.

From-SVN: r275478
This commit is contained in:
Jim Wilson 2019-09-07 00:09:21 +00:00 • committed by Jim Wilson
parent e83573abb3
commit 2f4d895197
4 changed files with 12 additions and 12 deletions
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5
gcc/ChangeLog
View file

@ -1,3 +1,8 @@
2019-09-06 Jim Wilson <jimw@sifive.com>
* config/riscv/riscv.c (riscv_option_override): Revert 2019-08-30
change.
2019-09-06 Segher Boessenkool <segher@kernel.crashing.org>
* config/rs6000/rs6000.md (unspec): Delete UNSPEC_MV_CR_OV.

10
gcc/config/riscv/riscv.c
View file

@ -4636,16 +4636,6 @@ riscv_option_override (void)
error ("%<-mriscv-attribute%> RISC-V ELF attribute requires GNU as 2.32"
" [%<-mriscv-attribute%>]");
#endif
/* The save-restore routines use t0 which is clobbered by the plt header,
so we can't use them when building shared libraries. */
if (TARGET_SAVE_RESTORE && flag_pic && TARGET_PLT)
{
target_flags &= ~MASK_SAVE_RESTORE;
if (target_flags_explicit & MASK_SAVE_RESTORE)
warning (0, "%<-msave-restore%> disabled; not supported with PLT "
"based shared libraries");
}
}
/* Implement TARGET_CONDITIONAL_REGISTER_USAGE. */

5
libgcc/ChangeLog
View file

@ -1,3 +1,8 @@
2019-09-06 Jim Wilson <jimw@sifive.com>
* config.host (riscv*-*-linux*): Add t-slibgcc-libgcc to tmake_file.
(riscv*-*-freebsd*): Likewise.
2019-09-03 Ulrich Weigand <uweigand@de.ibm.com>
* config.host: Remove references to spu.

4
libgcc/config.host
View file

@ -1201,12 +1201,12 @@ pru-*-*)
tm_file="$tm_file pru/pru-abi.h"
;;
riscv*-*-linux*)
tmake_file="${tmake_file} riscv/t-softfp${host_address} t-softfp riscv/t-elf riscv/t-elf${host_address}"
tmake_file="${tmake_file} riscv/t-softfp${host_address} t-softfp riscv/t-elf riscv/t-elf${host_address} t-slibgcc-libgcc"
extra_parts="$extra_parts crtbegin.o crtend.o crti.o crtn.o crtendS.o crtbeginT.o"
md_unwind_header=riscv/linux-unwind.h
;;
riscv*-*-freebsd*)
tmake_file="${tmake_file} riscv/t-softfp${host_address} t-softfp riscv/t-elf riscv/t-elf${host_address}"
tmake_file="${tmake_file} riscv/t-softfp${host_address} t-softfp riscv/t-elf riscv/t-elf${host_address} t-slibgcc-libgcc"
extra_parts="$extra_parts crtbegin.o crtend.o crti.o crtn.o crtendS.o crtbeginT.o"
;;
riscv*-*-*)