Try to prevent mangling for symbol names

Author: nathansam

src/rust/Cargo.toml

@@ -18,3 +18,9 @@ lazy_static = "1.5"
 [profile.release]
 lto = true
 codegen-units = 1
+strip = "symbols"
+panic = "abort"
+
+# Specific profile for WASM builds
+[profile.release.package."*"]
+opt-level = "s"

src/rust/src/lib.rs

@@ -279,6 +279,7 @@ fn first_is_month(date_vec: &[String]) -> bool {
 /// Validate day imputation value range
 /// @noRd
 #[extendr]
+#[no_mangle]
 fn checkday(day_impute: Robj) -> Result<()> {
     if day_impute.is_null() || day_impute.len() == 0 {
         return Ok(()); // nothing to check
@@ -721,6 +722,7 @@ fn fix_date_native(
 /// Analyze and fix date strings in a whole column of a DataFrame
 /// @noRd
 #[extendr]
+#[no_mangle]
 fn fix_date_column(
     dates: Vec<String>,
     day_impute: i32,
@@ -753,6 +755,7 @@ fn fix_date_column(
 /// Main date fixing function - Rust implementation of .fix_date
 /// @noRd
 #[extendr]
+#[no_mangle]
 fn fix_date(
     date: Robj,
     day_impute: Option<i32>,

tools/config.R

@@ -63,10 +63,10 @@ cfg <- if (is_debug) "debug" else "release"
 # there may be use cases later where this can be adapted or expanded
 .target <- ifelse(is_wasm, paste0("--target=", webr_target), "")
 
-# add panic exports only for WASM builds via RUSTFLAGS
+# add panic exports and symbol optimization flags only for WASM builds via RUSTFLAGS
 .panic_exports <- ifelse(
   is_wasm,
-  "RUSTFLAGS=\"$RUSTFLAGS -C panic=abort\" ",
+  "RUSTFLAGS=\"$RUSTFLAGS -C panic=abort -C opt-level=s -C lto=fat -C codegen-units=1 -C strip=symbols\" ",
   ""
 )