From fa9358cba3d72990e0800f78234c7ee2cfdbec78 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Orhun=20Parmaks=C4=B1z?= <orhunparmaksiz@gmail.com>
Date: Wed, 1 Nov 2023 21:56:28 +0100
Subject: [PATCH 1/2] fix(args): make header argument optional

fixes #2677
---
 bindgen-cli/options.rs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/bindgen-cli/options.rs b/bindgen-cli/options.rs
index d52ccb8e89..b1cae9b527 100644
--- a/bindgen-cli/options.rs
+++ b/bindgen-cli/options.rs
@@ -8,6 +8,7 @@ use clap::error::{Error, ErrorKind};
 use clap::{CommandFactory, Parser};
 use std::fs::File;
 use std::io;
+use std::io::{Error as IoError, ErrorKind as IoErrorKind};
 use std::path::{Path, PathBuf};
 use std::process::exit;
 
@@ -95,7 +96,7 @@ fn parse_custom_derive(
 )]
 struct BindgenCommand {
     /// C or C++ header file.
-    header: String,
+    header: Option<String>,
     /// Path to write depfile to.
     #[arg(long)]
     depfile: Option<String>,
@@ -589,7 +590,11 @@ where
 
     let mut builder = builder();
 
-    builder = builder.header(header);
+    if let Some(header) = header {
+        builder = builder.header(header);
+    } else {
+        return Err(IoError::new(IoErrorKind::Other, "Header not found"));
+    }
 
     if let Some(rust_target) = rust_target {
         builder = builder.rust_target(rust_target);

From 5607d8586531650afad4852fa2bb3c4612f3fe66 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Orhun=20Parmaks=C4=B1z?= <orhunparmaksiz@gmail.com>
Date: Thu, 2 Nov 2023 10:57:07 +0100
Subject: [PATCH 2/2] refactor(args): avoid using type aliases

---
 bindgen-cli/options.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/bindgen-cli/options.rs b/bindgen-cli/options.rs
index b1cae9b527..f82d391901 100644
--- a/bindgen-cli/options.rs
+++ b/bindgen-cli/options.rs
@@ -8,7 +8,6 @@ use clap::error::{Error, ErrorKind};
 use clap::{CommandFactory, Parser};
 use std::fs::File;
 use std::io;
-use std::io::{Error as IoError, ErrorKind as IoErrorKind};
 use std::path::{Path, PathBuf};
 use std::process::exit;
 
@@ -593,7 +592,7 @@ where
     if let Some(header) = header {
         builder = builder.header(header);
     } else {
-        return Err(IoError::new(IoErrorKind::Other, "Header not found"));
+        return Err(io::Error::new(io::ErrorKind::Other, "Header not found"));
     }
 
     if let Some(rust_target) = rust_target {