Force PIC as the final x64 compiler flag.

crates/bds-ui/tests/packaging_assets.rs

@@ -148,8 +148,8 @@ fn tagged_releases_are_built_and_packaged_with_rust_tools() {
         "publish",
         "PKG_CONFIG_ALLOW_CROSS",
         "CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER",
-        "CC_x86_64_unknown_linux_gnu: x86_64-linux-gnu-gcc -fPIC",
-        "CXX_x86_64_unknown_linux_gnu: x86_64-linux-gnu-g++ -fPIC",
+        "export CC_x86_64_unknown_linux_gnu=\"$PWD/.gitea/scripts/x86_64-linux-gnu-gcc-pic\"",
+        "export CXX_x86_64_unknown_linux_gnu=\"$PWD/.gitea/scripts/x86_64-linux-gnu-g++-pic\"",
         "unset ZSTD_SYS_USE_PKG_CONFIG",
     ] {
         assert!(
@@ -260,3 +260,22 @@ fn tagged_releases_are_built_and_packaged_with_rust_tools() {
     assert!(release_source.contains("rewrite_macho_rpaths"));
     assert!(!release_source.contains("Linux releases contain the portable CLI tools"));
 }
+
+#[test]
+fn x64_cross_compiler_wrappers_append_pic_last() {
+    for (script, compiler) in [
+        ("x86_64-linux-gnu-gcc-pic", "x86_64-linux-gnu-gcc"),
+        ("x86_64-linux-gnu-g++-pic", "x86_64-linux-gnu-g++"),
+    ] {
+        let contents = fs::read_to_string(
+            Path::new(CRATE_DIR)
+                .join("../../.gitea/scripts")
+                .join(script),
+        )
+        .unwrap();
+        assert_eq!(
+            contents,
+            format!("#!/bin/sh\nexec {compiler} \"$@\" -fPIC\n")
+        );
+    }
+}