On rv32gcv testcases like g++.target/riscv/rvv/base/bug-22.C fail with:
FAIL: g++.target/riscv/rvv/base/bug-22.C (test for excess errors)
Excess errors:
cc1plus: error: ABI requires '-march=rv32'

This patch adds the -mabi argument to g++ rvv tests.

gcc/testsuite/ChangeLog:

        * g++.target/riscv/rvv/rvv.exp: Add -mabi argument to CFLAGS.

Signed-off-by: Patrick O'Neill <patr...@rivosinc.com>
---
Resolved failures:
FAIL: g++.target/riscv/rvv/base/bug-18.C (test for excess errors)
FAIL: g++.target/riscv/rvv/base/bug-19.C (test for excess errors)
FAIL: g++.target/riscv/rvv/base/bug-20.C (test for excess errors)
FAIL: g++.target/riscv/rvv/base/bug-21.C (test for excess errors)
FAIL: g++.target/riscv/rvv/base/bug-22.C (test for excess errors)
---
 gcc/testsuite/g++.target/riscv/rvv/rvv.exp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gcc/testsuite/g++.target/riscv/rvv/rvv.exp 
b/gcc/testsuite/g++.target/riscv/rvv/rvv.exp
index c30d6e93144..5b01e4e05d2 100644
--- a/gcc/testsuite/g++.target/riscv/rvv/rvv.exp
+++ b/gcc/testsuite/g++.target/riscv/rvv/rvv.exp
@@ -28,15 +28,17 @@ if ![istarget riscv*-*-*] then {
 load_lib g++-dg.exp
 
 set gcc_march "rv64gcv_zfh"
+set gcc_mabi  "lp64d"
 if [istarget riscv32-*-*] then {
   set gcc_march "rv32gcv_zfh"
+  set gcc_mabi  "ilp32d"
 }
 
 # Initialize `dg'.
 dg-init
 
 # Main loop.
-set CFLAGS "-march=$gcc_march -O3"
+set CFLAGS "-march=$gcc_march -mabi=$gcc_mabi -O3"
 dg-runtest [lsort [glob -nocomplain $srcdir/$subdir/base/*.C]] \
        "" $CFLAGS
 
-- 
2.34.1

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