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RISC-V: For '-march' and '-mabi' options, add 'Negative' property mentions itself.

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When use multi-lib riscv-tool-chain. A bug is triggered when there are two
'-march' at command line.
riscv64-unknown-elf-gcc -march=rv32gcp -mabi=ilp32f -march=rv32gcpzp64 HelloWorld.c
/lhome/gengq/riscv64-linux-ptest/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/bin/ld: /lhome/gengq/riscv64-linux-ptest/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/lib/crt0.o: ABI is incompatible with that of the selected emulation:
  target emulation `elf64-littleriscv' does not match `elf32-littleriscv'
/lhome/gengq/riscv64-linux-ptest/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/bin/ld: failed to merge target specific data of file /lhome/gengq/riscv64-linux-ptest/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/lib/crt0.o
/lhome/gengq/riscv64-linux-ptest/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/bin/ld: /lhome/gengq/riscv64-linux-ptest/lib/gcc/riscv64-unknown-elf/10.2.0/crtbegin.o: ABI is incompatible with that of the selected emulation:
  target emulation `elf64-littleriscv' does not match `elf32-littleriscv'
/lhome/gengq/riscv64-linux-ptest/lib/gcc/riscv64-unknown-elf/10.2.0/../../../../riscv64-unknown-elf/bin/ld: failed to merge target specific data of file /lhome/gengq/riscv64-linux-ptest/lib/gcc/riscv64-unknown-elf/10.2.0/crtbegin.o
......

This patch fix it. And the DRIVER would prune the extra '-march' and '-mabi'
options and keep only the last one valid.

gcc/ChangeLog:
	* config/riscv/riscv.opt (march=,mabi=): Negative itself.
This commit is contained in:
Geng Qi 2021-04-28 16:29:33 +08:00 committed by Jim Wilson
parent 6efd040c30
commit 17f2908fcf
1 changed files with 2 additions and 2 deletions
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4
gcc/config/riscv/riscv.opt
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@ -38,7 +38,7 @@ Target Var(TARGET_PLT) Init(1)
When generating -fpic code, allow the use of PLTs. Ignored for fno-pic.
mabi=
Target RejectNegative Joined Enum(abi_type) Var(riscv_abi) Init(ABI_ILP32)
Target RejectNegative Joined Enum(abi_type) Var(riscv_abi) Init(ABI_ILP32) Negative(mabi=)
Specify integer and floating-point calling convention.
mpreferred-stack-boundary=
@ -79,7 +79,7 @@ Target Mask(DIV)
Use hardware instructions for integer division.
march=
Target RejectNegative Joined
Target RejectNegative Joined Negative(march=)
-march= Generate code for given RISC-V ISA (e.g. RV64IM). ISA strings must be
lower-case.