Fix some issues on MacOS platform (#937)

Fix some issues on MacOS platform
- Enable libc-wasi by default
- Set target abi to "gnu" if it is not set for wamrc to avoid generating
  object file of unsupported Mach-O format
- Set `<vendor>-<sys>` info according to target abi for wamrc to support
  generating AOT file for other OSs but not current host
- Set cpu name if arch/abi/cpu are not set to avoid checking SIMD
  capability failed
- Set size level to 1 for MacOS/Windows platform to avoid relocation type
  unsupported warning
- Clear posix_memmap.c compiling warning
- Fix spec case test script issues, enable test spec cases on MacOS

Signed-off-by: Wenyong Huang <wenyong.huang@intel.com>

tests/wamr-test-suites/spec-test-script/all.py

@@ -21,7 +21,8 @@ import time
 The script itself has to be put under the same directory with the "spec".
 """
 
-IWASM_CMD = "../../../product-mini/platforms/linux/build/iwasm"
+PLATFORM_NAME = os.uname().sysname.lower()
+IWASM_CMD = "../../../product-mini/platforms/" + PLATFORM_NAME + "/build/iwasm"
 IWASM_SGX_CMD = "../../../product-mini/platforms/linux-sgx/enclave-sample/iwasm"
 SPEC_TEST_DIR = "spec/test/core"
 WAST2WASM_CMD = "./wabt/out/gcc/Release/wat2wasm"

tests/wamr-test-suites/spec-test-script/runtest.py

@@ -141,6 +141,8 @@ class Runner():
                 os.killpg(self.p.pid, signal.SIGTERM)
             except OSError:
                 pass
+            except IOError:
+                pass
             self.p = None
             self.stdin.close()
             if self.stdin != self.stdout: