Allow setting the path to libbinaryen.so shared library (#3025)

This makes it easier to install libbinaryen.so into an alternative
locations. Fixes part of issue #2999 for me.

Author: rathann

check.py

@@ -292,7 +292,7 @@ def run_gcc_tests():
         src = os.path.join(shared.get_test_dir('example'), t)
         expected = os.path.join(shared.get_test_dir('example'), '.'.join(t.split('.')[:-1]) + '.txt')
         # build the C file separately
-        libpath = os.path.join(os.path.dirname(shared.options.binaryen_bin),  'lib')
+        libpath = shared.options.binaryen_lib
         extra = [shared.NATIVECC, src, '-c', '-o', 'example.o',
                  '-I' + os.path.join(shared.options.binaryen_root, 'src'), '-g', '-L' + libpath, '-pthread']
         if src.endswith('.cpp'):

scripts/test/shared.py

@@ -54,6 +54,10 @@ def parse_args(args):
               ' Default: bin/ of current directory (i.e. assume an in-tree build).'
               ' If not specified, the environment variable BINARYEN_ROOT= can also'
               ' be used to adjust this.'))
+    parser.add_argument(
+        '--binaryen-lib', dest='binaryen_lib', default='',
+        help=('Specifies a path to where the built Binaryen shared library resides at.'
+              ' Default: ./lib relative to bin specified above.'))
     parser.add_argument(
         '--binaryen-root', dest='binaryen_root', default='',
         help=('Specifies a path to the root of the Binaryen repository tree.'
@@ -120,6 +124,11 @@ def warn(text):
 
 options.binaryen_bin = os.path.normpath(os.path.abspath(options.binaryen_bin))
 
+if not options.binaryen_lib:
+    options.binaryen_lib = os.path.join(os.path.dirname(options.binaryen_bin),  'lib')
+
+options.binaryen_lib = os.path.normpath(os.path.abspath(options.binaryen_lib))
+
 # ensure BINARYEN_ROOT is set up
 os.environ['BINARYEN_ROOT'] = os.path.dirname(options.binaryen_bin)