gdb/riscv: make riscv target description names global

A later commit will need the names of the RISC-V target description
features in files other than riscv-tdep.c.  This commit just makes the
names global strings that can be accessed from other riscv-*.c files.

There should be no user visible changes after this commit.

gdb/ChangeLog:

        * riscv-tdep.c (riscv_feature_name_csr): Define.
        (riscv_feature_name_cpu): Define.
        (riscv_feature_name_fpu): Define.
        (riscv_feature_name_virtual): Define.
        (riscv_xreg_feature): Use riscv_feature_name_cpu.
        (riscv_freg_feature): Use riscv_feature_name_fpu.
        (riscv_virtual_feature): Use riscv_feature_name_virtual.
        (riscv_csr_feature): Use riscv_feature_name_csr.
        * riscv-tdep.h (riscv_feature_name_csr): Declare.

1 files changed, 3 insertions, 0 deletions

diff --git a/gdb/riscv-tdep.h b/gdb/riscv-tdep.h
index d1f1cf1..154097d 100644
--- a/gdb/riscv-tdep.h
+++ b/gdb/riscv-tdep.h
@@ -160,4 +160,7 @@ extern void riscv_supply_regset (const struct regset *regset,
 				  struct regcache *regcache, int regnum,
 				  const void *regs, size_t len);
 
+/* The names of the RISC-V target description features.  */
+extern const char *riscv_feature_name_csr;
+
 #endif /* RISCV_TDEP_H */