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Ignore macros that cause duplicate issues #8

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Merged
merged 1 commit into from
Jan 1, 2019
Merged

Ignore macros that cause duplicate issues #8

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39 changes: 34 additions & 5 deletions pg-extend/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,12 +7,12 @@

extern crate bindgen;

use std::collections::HashSet;
use std::env;
use std::path::PathBuf;

fn main() {
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap())
.join("postgres.rs");
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("postgres.rs");

if !out_path.exists() {
let pg_include = env::var("PG_INCLUDE_PATH")
Expand All @@ -27,17 +27,33 @@ fn main() {
// The bindgen::Builder is the main entry point
// to bindgen, and lets you build up options for
// the resulting bindings.

let ignored_macros = IgnoreMacros(
vec![
"FP_INFINITE".into(),
"FP_NAN".into(),
"FP_NORMAL".into(),
"FP_SUBNORMAL".into(),
"FP_ZERO".into(),
"IPPORT_RESERVED".into(),
]
.into_iter()
.collect(),
);

let bindings = bindgen::Builder::default()
.clang_arg(format!("-I{}",pg_include))
.clang_arg(format!("-I{}", pg_include))
// The input header we would like to generate
// bindings for.
.header("wrapper.h")
.parse_callbacks(Box::new(ignored_macros))
.rustfmt_bindings(true)
// FIXME: add this back
.layout_tests(false);

// Finish the builder and generate the bindings.
let bindings = bindings.generate()
// Finish the builder and generate the bindings.
let bindings = bindings
.generate()
// Unwrap the Result and panic on failure.
.expect("Unable to generate bindings");

Expand All @@ -47,3 +63,16 @@ fn main() {
.expect("Couldn't write bindings!");
}
}

#[derive(Debug)]
struct IgnoreMacros(HashSet<String>);

impl bindgen::callbacks::ParseCallbacks for IgnoreMacros {
fn will_parse_macro(&self, name: &str) -> bindgen::callbacks::MacroParsingBehavior {
if self.0.contains(name) {
bindgen::callbacks::MacroParsingBehavior::Ignore
} else {
bindgen::callbacks::MacroParsingBehavior::Default
}
}
}