Call emcc with ERROR_ON_UNDEFINED_SYMBOLS

src/libcoretest/num/flt2dec/estimator.rs

@@ -8,11 +8,14 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// FIXME https://github.com/kripken/emscripten/issues/4563
+// NB we have to actually not compile this test to avoid
+// an undefined symbol error
+#![cfg(not(target_os = "emscripten"))]
+
 use core::num::flt2dec::estimator::*;
 
 #[test]
-// FIXME https://github.com/kripken/emscripten/issues/4563
-#[cfg_attr(target_os = "emscripten", ignore)]
 fn test_estimate_scaling_factor() {
     macro_rules! assert_almost_eq {
         ($actual:expr, $expected:expr) => ({

src/librustc_back/target/asmjs_unknown_emscripten.rs

@@ -22,6 +22,7 @@ pub fn target() -> Result<Target, String> {
         allow_asm: false,
         obj_is_bitcode: true,
         max_atomic_width: 32,
+        post_link_args: vec!["-s".to_string(), "ERROR_ON_UNDEFINED_SYMBOLS=1".to_string()],
         .. Default::default()
     };
     Ok(Target {

src/librustc_back/target/wasm32_unknown_emscripten.rs

@@ -24,7 +24,8 @@ pub fn target() -> Result<Target, String> {
         allow_asm: false,
         obj_is_bitcode: true,
         max_atomic_width: 32,
-        post_link_args: vec!["-s".to_string(), "BINARYEN=1".to_string()],
+        post_link_args: vec!["-s".to_string(), "BINARYEN=1".to_string(),
+                             "-s".to_string(), "ERROR_ON_UNDEFINED_SYMBOLS=1".to_string()],
         .. Default::default()
     };
     Ok(Target {

src/libstd/sys/unix/process.rs

@@ -369,7 +369,7 @@ impl Command {
         }
 
         // NaCl has no signal support.
-        if cfg!(not(target_os = "nacl")) {
+        if cfg!(not(any(target_os = "nacl", target_os = "emscripten"))) {
             // Reset signal handling so the child process starts in a
             // standardized state. libstd ignores SIGPIPE, and signal-handling
             // libraries often set a mask. Child processes inherit ignored
@@ -589,7 +589,7 @@ impl Process {
     }
 }
 
-#[cfg(test)]
+#[cfg(all(test, not(target_os = "emscripten")))]
 mod tests {
     use super::*;
 
@@ -630,7 +630,6 @@ mod tests {
     #[test]
     #[cfg_attr(target_os = "macos", ignore)]
     #[cfg_attr(target_os = "nacl", ignore)] // no signals on NaCl.
-    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_process_mask() {
         unsafe {
             // Test to make sure that a signal mask does not get inherited.

src/libstd/sys/unix/thread.rs

@@ -29,6 +29,20 @@ pub struct Thread {
 unsafe impl Send for Thread {}
 unsafe impl Sync for Thread {}
 
+// The pthread_attr_setstacksize symbol doesn't exist in the emscripten libc,
+// so we have to not link to it to satisfy emcc's ERROR_ON_UNDEFINED_SYMBOLS.
+#[cfg(not(target_os = "emscripten"))]
+unsafe fn pthread_attr_setstacksize(attr: *mut libc::pthread_attr_t,
+                                    stack_size: libc::size_t) -> libc::c_int {
+    libc::pthread_attr_setstacksize(attr, stack_size)
+}
+
+#[cfg(target_os = "emscripten")]
+unsafe fn pthread_attr_setstacksize(_attr: *mut libc::pthread_attr_t,
+                                    _stack_size: libc::size_t) -> libc::c_int {
+    panic!()
+}
+
 impl Thread {
     pub unsafe fn new<'a>(stack: usize, p: Box<FnBox() + 'a>)
                           -> io::Result<Thread> {
@@ -38,8 +52,8 @@ impl Thread {
         assert_eq!(libc::pthread_attr_init(&mut attr), 0);
 
         let stack_size = cmp::max(stack, min_stack_size(&attr));
-        match libc::pthread_attr_setstacksize(&mut attr,
-                                              stack_size as libc::size_t) {
+        match pthread_attr_setstacksize(&mut attr,
+                                        stack_size as libc::size_t) {
             0 => {}
             n => {
                 assert_eq!(n, libc::EINVAL);

src/test/run-pass/format-no-std.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten missing rust_begin_unwind
+
 #![feature(lang_items, start, collections)]
 #![no_std]