[PATCH v3 18/20] bsd-user: Automatically generate syscall_nr.h

[Warner Losh <imp@bsdimp.com>]

Automatically generate syscall_nr.h from /usr/include/sys/syscall.h
since we can only run on a system that matches... This should reduce the
churn in the future.

Signed-off-by: Warner Losh <imp@bsdimp.com>
---
 bsd-user/freebsd/os-syscall.h | 2 +-
 bsd-user/meson.build          | 4 ++++
 bsd-user/syscallhdr.sh        | 7 +++++++
 meson.build                   | 2 ++
 4 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 bsd-user/syscallhdr.sh

diff --git a/bsd-user/freebsd/os-syscall.h b/bsd-user/freebsd/os-syscall.h
index 1f2c0acb1c5..b04d44ba78c 100644
--- a/bsd-user/freebsd/os-syscall.h
+++ b/bsd-user/freebsd/os-syscall.h
@@ -6,7 +6,7 @@
  * OS-Specific portion of syscall_defs.h
  */
 
-#include "freebsd/syscall_nr.h"
+#include "syscall_nr.h"
 
 /*
  * FreeBSD uses a 64bits time_t except on i386 so we have to add a special case
diff --git a/bsd-user/meson.build b/bsd-user/meson.build
index 7d1b4de78b1..67480dc5290 100644
--- a/bsd-user/meson.build
+++ b/bsd-user/meson.build
@@ -21,3 +21,7 @@ bsd_user_ss.add(files(
 subdir(targetos)
 
 specific_ss.add_all(when: 'CONFIG_BSD_USER', if_true: bsd_user_ss)
+
+bsd_syscall_nr = generator(sh,
+			   arguments: [ meson.current_source_dir() / 'syscallhdr.sh', '@INPUT@', '@OUTPUT@', '@EXTRA_ARGS@'],
+			   output: '@BASENAME@_nr.h')
diff --git a/bsd-user/syscallhdr.sh b/bsd-user/syscallhdr.sh
new file mode 100644
index 00000000000..c991c2df1d0
--- /dev/null
+++ b/bsd-user/syscallhdr.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+in="$1"
+out="$2"
+bsd="$3"
+
+awk -v bsd="$3" '{sub("SYS_", "TARGET_" bsd "_NR_", $0); print;}' < $in > $out
diff --git a/meson.build b/meson.build
index 29f8644d6d0..aedf0798d81 100644
--- a/meson.build
+++ b/meson.build
@@ -3470,6 +3470,8 @@ foreach target : target_dirs
       target_inc += include_directories('bsd-user/host/' / host_arch)
       dir = base_dir / abi
       arch_srcs += files(dir / 'signal.c', dir / 'target_arch_cpu.c')
+      arch_srcs += bsd_syscall_nr.process('/usr/include/sys/syscall.h',
+					  extra_args : targetos.to_upper())
     endif
     target_inc += include_directories(
       base_dir,
-- 
2.40.0