sanity check for js backend in fastcomp

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/test_sanity.py b/tests/test_sanity.py
index dc3d53db..e8b1f885 100644
--- a/tests/test_sanity.py
+++ b/tests/test_sanity.py
@@ -195,6 +195,34 @@ class sanity(RunnerCore):
     finally:
       del os.environ['EM_IGNORE_SANITY']
 
+  def test_llvm_fastcomp(self):
+    if os.environ.get('EMCC_FAST_COMPILER') != '1': return self.skip('not using fastcomp')
+
+    WARNING = 'fastcomp in use, but LLVM has not been built with the JavaScript backend as a target'
+
+    restore()
+
+    # Should see js backend during sanity check
+    assert check_fastcomp()
+    output = self.check_working(EMCC)
+    assert WARNING not in output, output
+
+    # Fake incorrect llc output, no mention of js backend
+    restore()
+    f = open(CONFIG_FILE, 'a')
+    f.write('LLVM_ROOT = "' + path_from_root('tests', 'fake') + '"')
+    f.close()
+
+    if not os.path.exists(path_from_root('tests', 'fake')):
+      os.makedirs(path_from_root('tests', 'fake'))
+
+    f = open(path_from_root('tests', 'fake', 'llc'), 'w')
+    f.write('#!/bin/sh\n')
+    f.write('echo "llc fake output\nRegistered Targets:\nno j-s backend for you!"')
+    f.close()
+    os.chmod(path_from_root('tests', 'fake', 'llc'), stat.S_IREAD | stat.S_IWRITE | stat.S_IEXEC)
+    output = self.check_working(EMCC, WARNING)
+
   def test_node(self):
     NODE_WARNING = 'node version appears too old'
     NODE_WARNING_2 = 'cannot check node version'