Add the `--override-abi` option (#2329)

* Add the `--override-abi` option.

This option can be used from the CLI with the <abi>:<regex> syntax and
it overrides the ABI of a function if it matches <regex>.

Fixes #2257

2 files changed, 21 insertions, 0 deletions

diff --git a/bindgen-tests/tests/expectations/tests/abi-override.rs b/bindgen-tests/tests/expectations/tests/abi-override.rs
new file mode 100644
index 00000000..49693692
--- /dev/null
+++ b/bindgen-tests/tests/expectations/tests/abi-override.rs
@@ -0,0 +1,16 @@
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
+
+extern "fastcall" {
+    pub fn foo();
+}
+extern "stdcall" {
+    pub fn bar();
+}
+extern "C" {
+    pub fn baz();
+}
diff --git a/bindgen-tests/tests/headers/abi-override.h b/bindgen-tests/tests/headers/abi-override.h
new file mode 100644
index 00000000..cee72cae
--- /dev/null
+++ b/bindgen-tests/tests/headers/abi-override.h
@@ -0,0 +1,5 @@
+// bindgen-flags: --override-abi=foo=fastcall --override-abi=bar=stdcall
+
+void foo();
+void bar();
+void baz();