meson: remove CONFIG_ALL

CONFIG_ALL is tricky to use and was ported over to Meson from the
recursive processing of Makefile variables.  Meson sourcesets
however have all_sources() and all_dependencies() methods that
remove the need for it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

docs/devel/build-system.rst

@@ -256,21 +256,6 @@ Target-independent emulator sourcesets:
   ``system_ss`` only in system emulators, ``user_ss`` only in user-mode
   emulators.
 
-  Target-independent sourcesets must exercise particular care when using
-  ``if_false`` rules.  The ``if_false`` rule will be used correctly when linking
-  emulator binaries; however, when *compiling* target-independent files
-  into .o files, Meson may need to pick *both* the ``if_true`` and
-  ``if_false`` sides to cater for targets that want either side.  To
-  achieve that, you can add a special rule using the ``CONFIG_ALL``
-  symbol::
-
-    # Some targets have CONFIG_ACPI, some don't, so this is not enough
-    system_ss.add(when: 'CONFIG_ACPI', if_true: files('acpi.c'),
-                                        if_false: files('acpi-stub.c'))
-
-    # This is required as well:
-    system_ss.add(when: 'CONFIG_ALL', if_true: files('acpi-stub.c'))
-
 Target-dependent emulator sourcesets:
   In the target-dependent set lives CPU emulation, some device emulation and
   much glue code. This sometimes also has to be compiled multiple times,

fsdev/meson.build

@@ -1,6 +1,5 @@
 fsdev_ss = ss.source_set()
 fsdev_ss.add(files('qemu-fsdev-opts.c', 'qemu-fsdev-throttle.c'))
-fsdev_ss.add(when: 'CONFIG_ALL', if_true: files('qemu-fsdev-dummy.c'))
 fsdev_ss.add(when: ['CONFIG_FSDEV_9P'], if_true: files(
   '9p-iov-marshal.c',
   '9p-marshal.c',

hw/acpi/meson.build

@@ -33,9 +33,4 @@ endif
 system_ss.add(when: 'CONFIG_ACPI', if_false: files('acpi-stub.c', 'aml-build-stub.c', 'ghes-stub.c', 'acpi_interface.c'))
 system_ss.add(when: 'CONFIG_ACPI_PCI_BRIDGE', if_false: files('pci-bridge-stub.c'))
 system_ss.add_all(when: 'CONFIG_ACPI', if_true: acpi_ss)
-system_ss.add(when: 'CONFIG_ALL', if_true: files('acpi-stub.c', 'aml-build-stub.c',
-                                                  'acpi-x86-stub.c', 'ipmi-stub.c', 'ghes-stub.c',
-                                                  'acpi-mem-hotplug-stub.c', 'acpi-cpu-hotplug-stub.c',
-                                                  'acpi-pci-hotplug-stub.c', 'acpi-nvdimm-stub.c',
-                                                  'cxl-stub.c', 'pci-bridge-stub.c'))
 system_ss.add(files('acpi-qmp-cmds.c'))

hw/cxl/meson.build

@@ -11,5 +11,3 @@ system_ss.add(when: 'CONFIG_CXL',
                if_false: files(
                    'cxl-host-stubs.c',
                ))
-
-system_ss.add(when: 'CONFIG_ALL', if_true: files('cxl-host-stubs.c'))

hw/display/meson.build

@@ -143,5 +143,4 @@ endif
 
 system_ss.add(when: 'CONFIG_OMAP', if_true: files('omap_lcdc.c'))
 
-system_ss.add(when: 'CONFIG_ALL', if_true: files('acpi-vga-stub.c'))
 modules += { 'hw-display': hw_display_modules }

hw/mem/meson.build

@@ -5,7 +5,6 @@ mem_ss.add(when: 'CONFIG_NPCM7XX', if_true: files('npcm7xx_mc.c'))
 mem_ss.add(when: 'CONFIG_NVDIMM', if_true: files('nvdimm.c'))
 mem_ss.add(when: 'CONFIG_CXL_MEM_DEVICE', if_true: files('cxl_type3.c'))
 system_ss.add(when: 'CONFIG_CXL_MEM_DEVICE', if_false: files('cxl_type3_stubs.c'))
-system_ss.add(when: 'CONFIG_ALL', if_true: files('cxl_type3_stubs.c'))
 
 system_ss.add_all(when: 'CONFIG_MEM_DEVICE', if_true: mem_ss)
 

hw/net/meson.build

@@ -50,7 +50,6 @@ specific_ss.add(when: 'CONFIG_VIRTIO_NET', if_true: files('virtio-net.c'))
 
 if have_vhost_net
   system_ss.add(when: 'CONFIG_VIRTIO_NET', if_true: files('vhost_net.c'), if_false: files('vhost_net-stub.c'))
-  system_ss.add(when: 'CONFIG_ALL', if_true: files('vhost_net-stub.c'))
 else
   system_ss.add(files('vhost_net-stub.c'))
 endif
@@ -69,7 +68,6 @@ system_ss.add(when: 'CONFIG_ROCKER', if_true: files(
   'rocker/rocker_of_dpa.c',
   'rocker/rocker_world.c',
 ), if_false: files('rocker/qmp-norocker.c'))
-system_ss.add(when: 'CONFIG_ALL', if_true: files('rocker/qmp-norocker.c'))
 system_ss.add(files('rocker/rocker-hmp-cmds.c'))
 
 subdir('can')

hw/pci-bridge/meson.build

@@ -13,5 +13,3 @@ pci_ss.add(when: 'CONFIG_CXL', if_true: files('cxl_root_port.c', 'cxl_upstream.c
 pci_ss.add(when: 'CONFIG_SIMBA', if_true: files('simba.c'))
 
 system_ss.add_all(when: 'CONFIG_PCI', if_true: pci_ss)
-
-system_ss.add(when: 'CONFIG_ALL', if_true: files('pci_expander_bridge_stubs.c'))

hw/pci/meson.build

@@ -20,4 +20,3 @@ system_ss.add(when: 'CONFIG_PCI_EXPRESS', if_true: files('pcie_port.c', 'pcie_ho
 system_ss.add_all(when: 'CONFIG_PCI', if_true: pci_ss)
 
 system_ss.add(when: 'CONFIG_PCI', if_false: files('pci-stub.c'))
-system_ss.add(when: 'CONFIG_ALL', if_true: files('pci-stub.c'))

hw/remote/meson.build

@@ -11,7 +11,6 @@ remote_ss.add(when: 'CONFIG_MULTIPROCESS', if_true: files('iommu.c'))
 remote_ss.add(when: 'CONFIG_VFIO_USER_SERVER', if_true: libvfio_user_dep)
 remote_ss.add(when: 'CONFIG_VFIO_USER_SERVER', if_true: files('vfio-user-obj.c'),
               if_false: files('vfio-user-obj-stub.c'))
-remote_ss.add(when: 'CONFIG_ALL', if_true: files('vfio-user-obj-stub.c'))
 
 specific_ss.add(when: 'CONFIG_MULTIPROCESS', if_true: files('memory.c'))
 specific_ss.add(when: 'CONFIG_MULTIPROCESS', if_true: files('proxy-memory-listener.c'))

hw/smbios/meson.build

@@ -6,8 +6,3 @@ smbios_ss.add(when: 'CONFIG_IPMI',
 
 system_ss.add_all(when: 'CONFIG_SMBIOS', if_true: smbios_ss)
 system_ss.add(when: 'CONFIG_SMBIOS', if_false: files('smbios-stub.c'))
-
-system_ss.add(when: 'CONFIG_ALL', if_true: files(
-  'smbios-stub.c',
-  'smbios_type_38-stub.c',
-))

hw/virtio/meson.build

@@ -74,8 +74,6 @@ specific_virtio_ss.add_all(when: 'CONFIG_VIRTIO_PCI', if_true: virtio_pci_ss)
 system_ss.add_all(when: 'CONFIG_VIRTIO', if_true: system_virtio_ss)
 system_ss.add(when: 'CONFIG_VIRTIO', if_false: files('vhost-stub.c'))
 system_ss.add(when: 'CONFIG_VIRTIO', if_false: files('virtio-stub.c'))
-system_ss.add(when: 'CONFIG_ALL', if_true: files('vhost-stub.c'))
-system_ss.add(when: 'CONFIG_ALL', if_true: files('virtio-stub.c'))
 system_ss.add(files('virtio-hmp-cmds.c'))
 
 specific_ss.add_all(when: 'CONFIG_VIRTIO', if_true: specific_virtio_ss)

meson.build

@@ -2888,7 +2888,6 @@ minikconf = find_program('scripts/minikconf.py')
 
 config_all = {}
 config_all_devices = {}
-config_all_disas = {}
 config_devices_mak_list = []
 config_devices_h = {}
 config_target_h = {}
@@ -3014,7 +3013,6 @@ foreach target : target_dirs
     if host_arch.startswith(k) or config_target['TARGET_BASE_ARCH'].startswith(k)
       foreach sym: v
         config_target += { sym: 'y' }
-        config_all_disas += { sym: 'y' }
       endforeach
     endif
   endforeach
@@ -3073,24 +3071,6 @@ foreach target : target_dirs
 endforeach
 target_dirs = actual_target_dirs
 
-# This configuration is used to build files that are shared by
-# multiple binaries, and then extracted out of the "common"
-# static_library target.
-#
-# We do not use all_sources()/all_dependencies(), because it would
-# build literally all source files, including devices only used by
-# targets that are not built for this compilation.  The CONFIG_ALL
-# pseudo symbol replaces it.
-
-config_all += config_all_devices
-config_all += config_all_disas
-config_all += {
-  'CONFIG_XEN': xen.found(),
-  'CONFIG_SYSTEM_ONLY': have_system,
-  'CONFIG_USER_ONLY': have_user,
-  'CONFIG_ALL': true,
-}
-
 target_configs_h = []
 foreach target: target_dirs
   target_configs_h += config_target_h[target]
@@ -3556,7 +3536,7 @@ foreach d, list : modules
 
   foreach m, module_ss : list
     if enable_modules
-      module_ss = module_ss.apply(config_all, strict: false)
+      module_ss = module_ss.apply(config_all_devices, strict: false)
       sl = static_library(d + '-' + m, [genh, module_ss.sources()],
                           dependencies: [modulecommon, module_ss.dependencies()], pic: true)
       if d == 'block'
@@ -3751,13 +3731,15 @@ common_ss.add(qom, qemuutil)
 common_ss.add_all(when: 'CONFIG_SYSTEM_ONLY', if_true: [system_ss])
 common_ss.add_all(when: 'CONFIG_USER_ONLY', if_true: user_ss)
 
-common_all = common_ss.apply(config_all, strict: false)
+# Note that this library is never used directly (only through extract_objects)
+# and is not built by default; therefore, source files not used by the build
+# configuration will be in build.ninja, but are never built by default.
 common_all = static_library('common',
                             build_by_default: false,
-                            sources: common_all.sources() + genh,
+                            sources: common_ss.all_sources() + genh,
                             include_directories: common_user_inc,
                             implicit_include_directories: false,
-                            dependencies: common_all.dependencies(),
+                            dependencies: common_ss.all_dependencies(),
                             name_suffix: 'fa')
 
 feature_to_c = find_program('scripts/feature_to_c.py')
@@ -4230,7 +4212,7 @@ if have_system
   if xen.found()
     summary_info += {'xen ctrl version':  xen.version()}
   endif
-  summary_info += {'Xen emulation':     config_all.has_key('CONFIG_XEN_EMU')}
+  summary_info += {'Xen emulation':     config_all_devices.has_key('CONFIG_XEN_EMU')}
 endif
 summary_info += {'TCG support':       config_all.has_key('CONFIG_TCG')}
 if config_all.has_key('CONFIG_TCG')

net/meson.build

@@ -41,7 +41,6 @@ system_ss.add(when: libxdp, if_true: files('af-xdp.c'))
 
 if have_vhost_net_user
   system_ss.add(when: 'CONFIG_VIRTIO_NET', if_true: files('vhost-user.c'), if_false: files('vhost-user-stub.c'))
-  system_ss.add(when: 'CONFIG_ALL', if_true: files('vhost-user-stub.c'))
 endif
 
 if targetos == 'windows'
@@ -57,7 +56,6 @@ else
 endif
 if have_vhost_net_vdpa
   system_ss.add(when: 'CONFIG_VIRTIO_NET', if_true: files('vhost-vdpa.c'), if_false: files('vhost-vdpa-stub.c'))
-  system_ss.add(when: 'CONFIG_ALL', if_true: files('vhost-vdpa-stub.c'))
 endif
 
 vmnet_files = files(