[PULL v2 10/23] meson: *-user: only descend into *-user when configured

[Warner Losh <imp@bsdimp.com>]

To increase flexibility, only descend into *-user when that is
configured. This allows *-user to selectively include directories based
on the host OS which may not exist on all hosts. Adopt Paolo's
suggestion of checking the configuration in the directories that know
about the configuration.

Message-Id: <20210926220103.1721355-2-f4bug@amsat.org>
Message-Id: <20210926220103.1721355-3-f4bug@amsat.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Warner Losh <wlosh@bsdimp.com>
Acked-by: Paolo Bonzini <pbonzinni@redhat.com>
Reviewed-by: Kyle Evans <kevans@FreeBSD.org>
---
 bsd-user/meson.build   |  4 ++++
 linux-user/meson.build |  4 ++++
 meson.build            | 12 ++++++++----
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/bsd-user/meson.build b/bsd-user/meson.build
index 0369549340..5378f56f71 100644
--- a/bsd-user/meson.build
+++ b/bsd-user/meson.build
@@ -1,3 +1,7 @@
+if not have_bsd_user
+   subdir_done()
+endif
+
 bsd_user_ss.add(files(
   'bsdload.c',
   'elfload.c',
diff --git a/linux-user/meson.build b/linux-user/meson.build
index 9549f81682..bf62c13e37 100644
--- a/linux-user/meson.build
+++ b/linux-user/meson.build
@@ -1,3 +1,7 @@
+if not have_linux_user
+   subdir_done()
+endif
+
 linux_user_ss.add(files(
   'elfload.c',
   'exit.c',
diff --git a/meson.build b/meson.build
index 6b7487b725..5e7946776d 100644
--- a/meson.build
+++ b/meson.build
@@ -40,12 +40,15 @@ config_host_data = configuration_data()
 genh = []
 
 target_dirs = config_host['TARGET_DIRS'].split()
-have_user = false
+have_linux_user = false
+have_bsd_user = false
 have_system = false
 foreach target : target_dirs
-  have_user = have_user or target.endswith('-user')
+  have_linux_user = have_linux_user or target.endswith('linux-user')
+  have_bsd_user = have_bsd_user or target.endswith('bsd-user')
   have_system = have_system or target.endswith('-softmmu')
 endforeach
+have_user = have_linux_user or have_bsd_user
 have_tools = 'CONFIG_TOOLS' in config_host
 have_block = have_system or have_tools
 
@@ -2595,10 +2598,11 @@ subdir('bsd-user')
 subdir('linux-user')
 subdir('ebpf')
 
-bsd_user_ss.add(files('gdbstub.c'))
+common_ss.add(libbpf)
+
 specific_ss.add_all(when: 'CONFIG_BSD_USER', if_true: bsd_user_ss)
 
-linux_user_ss.add(files('gdbstub.c', 'thunk.c'))
+linux_user_ss.add(files('thunk.c'))
 specific_ss.add_all(when: 'CONFIG_LINUX_USER', if_true: linux_user_ss)
 
 # needed for fuzzing binaries
-- 
2.32.0