use compiler opts in -E, to use our target, system dirs, etc.; fixes #2534

2 files changed, 8 insertions, 1 deletions

diff --git a/emcc b/emcc
index 8ad2adad..15cfbb7b 100755
--- a/emcc
+++ b/emcc
@@ -744,7 +744,7 @@ if '-M' in sys.argv or '-MM' in sys.argv:
 
 if '-E' in sys.argv:
   # Just run the preprocessor
-  cmd = [CC] + sys.argv[1:]
+  cmd = [CC] + shared.COMPILER_OPTS + sys.argv[1:]
   logging.debug('just preprocessor ' + ' '.join(cmd))
   exit(subprocess.call(cmd))
 
diff --git a/tests/test_other.py b/tests/test_other.py
index 0f71751a..2bbe0a30 100644
--- a/tests/test_other.py
+++ b/tests/test_other.py
@@ -3086,6 +3086,13 @@ minor: %d
 tiny: %d
 ''' % (EMSCRIPTEN_VERSION_MAJOR, EMSCRIPTEN_VERSION_MINOR, EMSCRIPTEN_VERSION_TINY), run_js('a.out.js'))
 
+  def test_dashE(self):
+    open('src.cpp', 'w').write(r'''#include <emscripten.h>
+EMSCRIPTEN_KEEPALIVE __EMSCRIPTEN_major__ __EMSCRIPTEN_minor__ __EMSCRIPTEN_tiny__ EMSCRIPTEN_KEEPALIVE
+''')
+    out = Popen([PYTHON, EMCC, 'src.cpp', '-E'], stdout=PIPE).communicate()[0]
+    self.assertContained(r'''__attribute__((used)) %d %d %d __attribute__((used))''' % (EMSCRIPTEN_VERSION_MAJOR, EMSCRIPTEN_VERSION_MINOR, EMSCRIPTEN_VERSION_TINY), out)
+
   def test_malloc_implicit(self):
     open('src.cpp', 'w').write(r'''
 #include <stdlib.h>