[PATCH v2] RISC-V: Add Z*inx imcompatible check in gcc.

[Jiawei]

Z*inx is conflict with float extensions, add incompatible check when
z*inx and hard_float both enabled.

gcc/ChangeLog:

        * config/riscv/riscv.cc (riscv_option_override): New check.

gcc/testsuite/ChangeLog:

        * gcc.target/riscv/arch-19.c: New test.

---
 gcc/config/riscv/riscv.cc                | 4 ++++
 gcc/testsuite/gcc.target/riscv/arch-19.c | 4 ++++
 2 files changed, 8 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/riscv/arch-19.c

diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index 76eee4a55e9..162ba14d3c7 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -6285,6 +6285,10 @@ riscv_option_override (void)
       && riscv_abi != ABI_LP64 && riscv_abi != ABI_ILP32E)
     error ("z*inx requires ABI ilp32, ilp32e or lp64");
 
+  // Zfinx is conflict with float extensions.
+  if (TARGET_ZFINX && TARGET_HARD_FLOAT)
+    error ("z*inx is conflict with float extensions");
+
   /* We do not yet support ILP32 on RV64.  */
   if (BITS_PER_WORD != POINTER_SIZE)
     error ("ABI requires %<-march=rv%d%>", POINTER_SIZE);
diff --git a/gcc/testsuite/gcc.target/riscv/arch-19.c 
b/gcc/testsuite/gcc.target/riscv/arch-19.c
new file mode 100644
index 00000000000..a6f72af3677
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/arch-19.c
@@ -0,0 +1,4 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64if_zfinx -mabi=lp64" } */
+int foo() {}
+/* { dg-error "z*inx is conflict with float extensions" "" { target *-*-* } 0 
} */
-- 
2.25.1