Add helper crate to generate syscalls.txt

programs/bpf/Cargo.lock

@@ -2637,7 +2637,6 @@ dependencies = [
  "byteorder 1.4.3",
  "libsecp256k1 0.6.0",
  "log",
- "regex",
  "solana-measure",
  "solana-program-runtime",
  "solana-sdk",

programs/bpf_loader/Cargo.toml

@@ -9,9 +9,6 @@ homepage = "https://solana.com/"
 documentation = "https://docs.rs/solana-bpf-loader-program"
 edition = "2021"
 
-[build-dependencies]
-regex = "1.5.4"
-
 [dependencies]
 bincode = "1.3.3"
 byteorder = "1.4.3"

programs/bpf_loader/gen-syscall-list/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "gen-syscall-list"
+version = "1.10.0"
+edition = "2021"
+license = "Apache-2.0"
+publish = false
+
+[build-dependencies]
+regex = "1.5.4"

programs/bpf_loader/gen-syscall-list/build.rs

@@ -4,7 +4,6 @@ use {
         fs::File,
         io::{prelude::*, BufWriter, Read},
         path::PathBuf,
-        process::exit,
         str,
     },
 };
@@ -15,18 +14,24 @@ use {
  * to verify undefined symbols in a .so module that cargo-build-bpf has built.
  */
 fn main() {
-    let path = PathBuf::from("src/syscalls.rs");
-    let mut file = match File::open(&path) {
+    let syscalls_rs_path = PathBuf::from("../src/syscalls.rs");
+    let syscalls_txt_path = PathBuf::from("../../../sdk/bpf/syscalls.txt");
+    println!(
+        "cargo:warning=(not a warning) Generating {1} from {0}",
+        syscalls_rs_path.display(),
+        syscalls_txt_path.display()
+    );
+
+    let mut file = match File::open(&syscalls_rs_path) {
         Ok(x) => x,
-        _ => exit(1),
+        Err(err) => panic!("Failed to open {}: {}", syscalls_rs_path.display(), err),
     };
     let mut text = vec![];
     file.read_to_end(&mut text).unwrap();
     let text = str::from_utf8(&text).unwrap();
-    let path = PathBuf::from("../../sdk/bpf/syscalls.txt");
-    let file = match File::create(&path) {
+    let file = match File::create(&syscalls_txt_path) {
         Ok(x) => x,
-        _ => exit(1),
+        Err(err) => panic!("Failed to create {}: {}", syscalls_txt_path.display(), err),
     };
     let mut out = BufWriter::new(file);
     let sysc_re = Regex::new(r#"register_syscall_by_name\([[:space:]]*b"([^"]+)","#).unwrap();

programs/bpf_loader/gen-syscall-list/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    /* I do all my work in `../build.rs` */
+}