RISC-V: List valid -mtune options only once

This patch ensures that the list of valid -mtune options
does not contain entries more than once.
The -mtune option accepts CPU identifiers as well as
tuning identifiers and there are cases where a CPU and
its tuning have the same identifier.

	PR116347

gcc/ChangeLog:

	* common/config/riscv/riscv-common.cc (riscv_get_valid_option_values):
	Skip adding mtune entries that are already in the list.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

1 files changed, 13 insertions, 1 deletions

diff --git a/gcc/common/config/riscv/riscv-common.cc b/gcc/common/config/riscv/riscv-common.cc
index 4c9a72d..2f85bb2 100644
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -2437,7 +2437,19 @@ riscv_get_valid_option_values (int option_code,
 
 	const riscv_cpu_info *cpu_info = &riscv_cpu_tables[0];
 	for (;cpu_info->name; ++cpu_info)
-	  v.safe_push (cpu_info->name);
+	  {
+	    /* Skip duplicates.  */
+	    bool skip = false;
+	    int i;
+	    const char *str;
+	    FOR_EACH_VEC_ELT (v, i, str)
+	      {
+		if (!strcmp (str, cpu_info->name))
+		  skip = true;
+	      }
+	    if (!skip)
+	      v.safe_push (cpu_info->name);
+	  }
       }
       break;
     case OPT_mcpu_: