tcg: Build once for system and once for user-only

Create two static libraries for use by each execution mode.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/meson.build

@@ -1,3 +1,7 @@
+if not get_option('tcg').allowed()
+   subdir_done()
+endif
+
 tcg_ss = ss.source_set()
 
 tcg_ss.add(files(
@@ -14,8 +18,28 @@ tcg_ss.add(files(
 if get_option('tcg_interpreter')
   libffi = dependency('libffi', version: '>=3.0', required: true,
                       method: 'pkg-config')
-  specific_ss.add(libffi)
-  specific_ss.add(files('tci.c'))
+  tcg_ss.add(libffi)
+  tcg_ss.add(files('tci.c'))
 endif
 
-specific_ss.add_all(when: 'CONFIG_TCG', if_true: tcg_ss)
+tcg_ss = tcg_ss.apply(config_host, strict: false)
+
+libtcg_user = static_library('tcg_user',
+                             tcg_ss.sources() + genh,
+                             name_suffix: 'fa',
+                             c_args: '-DCONFIG_USER_ONLY',
+                             build_by_default: have_user)
+
+tcg_user = declare_dependency(link_with: libtcg_user,
+                              dependencies: tcg_ss.dependencies())
+user_ss.add(tcg_user)
+
+libtcg_softmmu = static_library('tcg_softmmu',
+                                tcg_ss.sources() + genh,
+                                name_suffix: 'fa',
+                                c_args: '-DCONFIG_SOFTMMU',
+                                build_by_default: have_system)
+
+tcg_softmmu = declare_dependency(link_with: libtcg_softmmu,
+                                 dependencies: tcg_ss.dependencies())
+softmmu_ss.add(tcg_softmmu)