meson: remove config_targetos

config_targetos is now empty and can be removed; its use in sourcesets
that do not involve target-specific files can be replaced with an empty
dictionary.

In fact, at this point *all* sourcesets that do not involve
target-specific files are just glorified mutable arrays.  Enforce that
they never test for symbols in "when:" by computing the set of files
without "strict: false".

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/meson.build b/meson.build
index e37ab28..7aa06dc 100644
--- a/meson.build
+++ b/meson.build
@@ -2885,7 +2885,6 @@
 ########################
 
 minikconf = find_program('scripts/minikconf.py')
-config_targetos = {}
 
 config_all = {}
 config_all_devices = {}
@@ -3084,7 +3083,6 @@
 # pseudo symbol replaces it.
 
 config_all += config_all_devices
-config_all += config_targetos
 config_all += config_all_disas
 config_all += {
   'CONFIG_XEN': xen.found(),
@@ -3413,7 +3411,7 @@
   modulecommon = declare_dependency(link_whole: libmodulecommon, compile_args: '-DBUILD_DSO')
 endif
 
-qom_ss = qom_ss.apply(config_targetos, strict: false)
+qom_ss = qom_ss.apply({})
 libqom = static_library('qom', qom_ss.sources() + genh,
                         dependencies: [qom_ss.dependencies()],
                         name_suffix: 'fa',
@@ -3428,10 +3426,10 @@
 event_loop_base = declare_dependency(link_whole: event_loop_base,
                                      dependencies: [qom])
 
-stub_ss = stub_ss.apply(config_all, strict: false)
+stub_ss = stub_ss.apply({})
 
 util_ss.add_all(trace_ss)
-util_ss = util_ss.apply(config_all, strict: false)
+util_ss = util_ss.apply({})
 libqemuutil = static_library('qemuutil',
                              build_by_default: false,
                              sources: util_ss.sources() + stub_ss.sources() + genh,
@@ -3594,7 +3592,6 @@
       foreach target : target_dirs
         if target.endswith('-softmmu')
           config_target = config_target_mak[target]
-          config_target += config_targetos
           target_inc = [include_directories('target' / config_target['TARGET_BASE_ARCH'])]
           c_args = ['-DNEED_CPU_H',
                     '-DCONFIG_TARGET="@0@-config-target.h"'.format(target),
@@ -3655,7 +3652,7 @@
                              capture: true,
                              command: [undefsym, nm, '@INPUT@'])
 
-authz_ss = authz_ss.apply(config_targetos, strict: false)
+authz_ss = authz_ss.apply({})
 libauthz = static_library('authz', authz_ss.sources() + genh,
                           dependencies: [authz_ss.dependencies()],
                           name_suffix: 'fa',
@@ -3664,7 +3661,7 @@
 authz = declare_dependency(link_whole: libauthz,
                            dependencies: qom)
 
-crypto_ss = crypto_ss.apply(config_targetos, strict: false)
+crypto_ss = crypto_ss.apply({})
 libcrypto = static_library('crypto', crypto_ss.sources() + genh,
                            dependencies: [crypto_ss.dependencies()],
                            name_suffix: 'fa',
@@ -3673,7 +3670,7 @@
 crypto = declare_dependency(link_whole: libcrypto,
                             dependencies: [authz, qom])
 
-io_ss = io_ss.apply(config_targetos, strict: false)
+io_ss = io_ss.apply({})
 libio = static_library('io', io_ss.sources() + genh,
                        dependencies: [io_ss.dependencies()],
                        link_with: libqemuutil,
@@ -3689,7 +3686,7 @@
                                dependencies: [zlib, qom, io])
 system_ss.add(migration)
 
-block_ss = block_ss.apply(config_targetos, strict: false)
+block_ss = block_ss.apply({})
 libblock = static_library('block', block_ss.sources() + genh,
                           dependencies: block_ss.dependencies(),
                           link_depends: block_syms,
@@ -3700,7 +3697,7 @@
                            link_args: '@block.syms',
                            dependencies: [crypto, io])
 
-blockdev_ss = blockdev_ss.apply(config_targetos, strict: false)
+blockdev_ss = blockdev_ss.apply({})
 libblockdev = static_library('blockdev', blockdev_ss.sources() + genh,
                              dependencies: blockdev_ss.dependencies(),
                              name_suffix: 'fa',
@@ -3709,7 +3706,7 @@
 blockdev = declare_dependency(link_whole: [libblockdev],
                               dependencies: [block, event_loop_base])
 
-qmp_ss = qmp_ss.apply(config_targetos, strict: false)
+qmp_ss = qmp_ss.apply({})
 libqmp = static_library('qmp', qmp_ss.sources() + genh,
                         dependencies: qmp_ss.dependencies(),
                         name_suffix: 'fa',
@@ -3724,7 +3721,7 @@
 
 chardev = declare_dependency(link_whole: libchardev)
 
-hwcore_ss = hwcore_ss.apply(config_targetos, strict: false)
+hwcore_ss = hwcore_ss.apply({})
 libhwcore = static_library('hwcore', sources: hwcore_ss.sources() + genh,
                            name_suffix: 'fa',
                            build_by_default: false)
@@ -3781,7 +3778,6 @@
             '-DCONFIG_DEVICES="@0@-config-devices.h"'.format(target)]
   link_args = emulator_link_args
 
-  config_target += config_targetos
   target_inc = [include_directories('target' / config_target['TARGET_BASE_ARCH'])]
   if targetos == 'linux'
     target_inc += include_directories('linux-headers', is_system: true)