configure: Merge riscv32 and riscv64 host architectures

The existing code for safe-syscall.inc.S will compile
without change for riscv32 and riscv64.  We may also
drop the meson.build stanza that merges them for tcg/.

Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

configure

@@ -570,11 +570,7 @@ elif check_define __s390__ ; then
     cpu="s390"
   fi
 elif check_define __riscv ; then
-  if check_define _LP64 ; then
-    cpu="riscv64"
-  else
-    cpu="riscv32"
-  fi
+  cpu="riscv"
 elif check_define __arm__ ; then
   cpu="arm"
 elif check_define __aarch64__ ; then
@@ -587,7 +583,7 @@ ARCH=
 # Normalise host CPU name and set ARCH.
 # Note that this case should only have supported host CPUs, not guests.
 case "$cpu" in
-  ppc|ppc64|s390x|sparc64|x32|riscv32|riscv64)
+  ppc|ppc64|s390x|sparc64|x32|riscv)
   ;;
   ppc64le)
     ARCH="ppc64"

linux-user/host/riscv/hostdep.h

@@ -5,8 +5,8 @@
  * See the COPYING file in the top-level directory.
  */
 
-#ifndef RISCV64_HOSTDEP_H
-#define RISCV64_HOSTDEP_H
+#ifndef RISCV_HOSTDEP_H
+#define RISCV_HOSTDEP_H
 
 /* We have a safe-syscall.inc.S */
 #define HAVE_SAFE_SYSCALL

linux-user/host/riscv32/hostdep.h

@@ -1,11 +0,0 @@
-/*
- * hostdep.h : things which are dependent on the host architecture
- *
- * This work is licensed under the terms of the GNU GPL, version 2 or later.
- * See the COPYING file in the top-level directory.
- */
-
-#ifndef RISCV32_HOSTDEP_H
-#define RISCV32_HOSTDEP_H
-
-#endif

meson.build

@@ -55,7 +55,7 @@ have_block = have_system or have_tools
 python = import('python').find_installation()
 
 supported_oses = ['windows', 'freebsd', 'netbsd', 'openbsd', 'darwin', 'sunos', 'linux']
-supported_cpus = ['ppc', 'ppc64', 's390x', 'riscv32', 'riscv64', 'x86', 'x86_64',
+supported_cpus = ['ppc', 'ppc64', 's390x', 'riscv', 'x86', 'x86_64',
   'arm', 'aarch64', 'mips', 'mips64', 'sparc', 'sparc64']
 
 cpu = host_machine.cpu_family()
@@ -351,8 +351,6 @@ if not get_option('tcg').disabled()
     tcg_arch = 'i386'
   elif config_host['ARCH'] == 'ppc64'
     tcg_arch = 'ppc'
-  elif config_host['ARCH'] in ['riscv32', 'riscv64']
-    tcg_arch = 'riscv'
   endif
   add_project_arguments('-iquote', meson.current_source_dir() / 'tcg' / tcg_arch,
                         language: ['c', 'cpp', 'objc'])