Use cyclic linker options just for gcc-based compilers

platformio/__init__.py

@@ -1,7 +1,7 @@
 # Copyright (C) Ivan Kravets <me@ikravets.com>
 # See LICENSE for details.
 
-VERSION = (2, 2, 2)
+VERSION = (2, 3, "0.dev0")
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"

platformio/builder/tools/piomisc.py

@@ -7,6 +7,8 @@ from glob import glob
 from os import remove
 from os.path import basename, join
 
+from platformio.util import exec_command
+
 
 class InoToCPPConverter(object):
 
@@ -157,6 +159,20 @@ def DumpIDEData(env):
     return data
 
 
+def getCompilerType(env):
+    try:
+        result = exec_command([env.subst("$CC"), "-v"], env=env['ENV'])
+    except OSError:
+        return None
+    if result['returncode'] != 0:
+        return None
+    output = "".join([result['out'], result['err']]).lower()
+    for type_ in ("clang", "gcc"):
+        if type_ in output:
+            return type_
+    return None
+
+
 def exists(_):
     return True
 
@@ -164,4 +180,5 @@ def exists(_):
 def generate(env):
     env.AddMethod(ConvertInoToCpp)
     env.AddMethod(DumpIDEData)
+    env.AddMethod(getCompilerType)
     return env

platformio/builder/tools/platformio.py

@@ -43,7 +43,7 @@ def BuildFirmware(env):
         )
 
     # enable "cyclic reference" for linker
-    if env.get("LIBS", deplibs):
+    if env.get("LIBS", deplibs) and env.getCompilerType() == "gcc":
         env.Prepend(
             _LIBFLAGS="-Wl,--start-group "
         )