sys: don't probe system for library if it's static

Author: willwwarner

src/codegen/sys/build.rs

@@ -42,10 +42,11 @@ fn generate_build_script(w: &mut dyn Write, env: &Env, split_build_rs: bool) ->
         writeln!(w, "mod build_version;")?;
     }
 
-    write!(
-        w,
-        "{}",
-        r#"
+    if !env.config.static_lib {
+        write!(
+            w,
+            "{}",
+            r#"
 fn main() {
     if std::env::var("DOCS_RS").is_ok() {
         // prevent linking libraries to avoid documentation failure
@@ -58,7 +59,18 @@ fn main() {
     }
 }
 "#
-    )
+        )
+    } else {
+        write!(
+            w,
+            "{}",
+            r#"
+fn main() {
+
+}
+"#
+        )
+    }
 }
 
 fn generate_build_version(w: &mut dyn Write, env: &Env) -> Result<()> {

src/config/config.rs

@@ -123,6 +123,7 @@ pub struct Config {
     /// to another doc source, for example when builds on docs.rs
     /// are limited due to license issues.
     pub external_docs_url: Option<String>,
+    pub static_lib: bool,
 }
 
 impl Config {
@@ -333,6 +334,11 @@ impl Config {
         let feature_dependencies = read_feature_dependencies(&toml)?;
         let external_docs_url = read_external_docs_url(&toml)?;
 
+        let static_lib = match toml.lookup("options.static_lib") {
+            Some(v) => v.as_result_bool("options.static_lib")?,
+            None => false,
+        };
+
         Ok(Self {
             work_mode,
             girs_dirs,
@@ -359,6 +365,7 @@ impl Config {
             lib_version_overrides,
             feature_dependencies,
             external_docs_url,
+            static_lib,
         })
     }