Create a place-holder signal.c file for each of the architectures that
are currently built. In the future, some code that's currently inlined
in target_arch_signal.h will live here.

Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 bsd-user/i386/signal.c   | 1 +
 bsd-user/x86_64/signal.c | 1 +
 meson.build              | 2 +-
 3 files changed, 3 insertions(+), 1 deletion(-)
 create mode 100644 bsd-user/i386/signal.c
 create mode 100644 bsd-user/x86_64/signal.c

diff --git a/bsd-user/i386/signal.c b/bsd-user/i386/signal.c
new file mode 100644
index 0000000000..ac90323365
--- /dev/null
+++ b/bsd-user/i386/signal.c
@@ -0,0 +1 @@
+/* Placeholder for signal.c */
diff --git a/bsd-user/x86_64/signal.c b/bsd-user/x86_64/signal.c
new file mode 100644
index 0000000000..ac90323365
--- /dev/null
+++ b/bsd-user/x86_64/signal.c
@@ -0,0 +1 @@
+/* Placeholder for signal.c */
diff --git a/meson.build b/meson.build
index 26c58123e9..14b0bb2042 100644
--- a/meson.build
+++ b/meson.build
@@ -2888,7 +2888,7 @@ foreach target : target_dirs
       base_dir = 'bsd-user'
       target_inc += include_directories('bsd-user/' / targetos)
       dir = base_dir / abi
-      arch_srcs += files(dir / 'target_arch_cpu.c')
+      arch_srcs += files(dir / 'signal.c', dir / 'target_arch_cpu.c')
     endif
     target_inc += include_directories(
       base_dir,
-- 
2.33.0