【OSX】build AOSP 2.3.7时的build error解决

原始的error log：

 ============================================
 PLATFORM_VERSION_CODENAME=REL
 PLATFORM_VERSION=2.3.
 TARGET_PRODUCT=generic
 TARGET_BUILD_VARIANT=eng
 TARGET_SIMULATOR=
 TARGET_BUILD_TYPE=release
 TARGET_BUILD_APPS=
 TARGET_ARCH=arm
 HOST_ARCH=x86
 HOST_OS=darwin
 HOST_BUILD_TYPE=release
 BUILD_ID=GWK74
 ============================================
 find: frameworks/base/frameworks/base/docs/html: No such file or directory
 find: out/target/common/docs/gen: No such file or directory
 find: frameworks/base/frameworks/base/docs/html: No such file or directory
 find: out/target/common/docs/gen: No such file or directory
 find: frameworks/base/frameworks/base/docs/html: No such file or directory
 find: out/target/common/docs/gen: No such file or directory
 find: frameworks/base/frameworks/base/docs/html: No such file or directory
 find: out/target/common/docs/gen: No such file or directory
 find: frameworks/base/frameworks/base/docs/html: No such file or directory
 find: out/target/common/docs/gen: No such file or directory
 host C: libclearsilver-jni <= external/clearsilver/java-jni/j_neo_util.c
 host C: libclearsilver-jni <= external/clearsilver/java-jni/j_neo_cs.c
 host C: libneo_util <= external/clearsilver/util/neo_files.c
 host StaticLib: libhost (out/host/darwin-x86/obj/STATIC_LIBRARIES/libhost_intermediates/libhost.a)
 echo out/host/darwin-x86/obj/STATIC_LIBRARIES/libhost_intermediates/pseudolocalize.o out/host/darwin-x86/obj/STATIC_LIBRARIES/libhost_intermediates/CopyFile.o | xargs ar cqs  out/host/darwin-x86/obj/STATIC_LIBRARIES/libhost_intermediates/libhost.a
 external/clearsilver/util/neo_files.c::: error: expected expression
     return nerr_raise(NERR_ASSERT, "Invalid call to ne_listdir_fmatch");
            ^
 external/clearsilver/util/neo_err.h::: note: expanded from macro
       'nerr_raise'
    nerr_raisef(__PRETTY_FUNCTION__,__FILE__,__LINE__,e,f,__VA_ARGS__)
                                                                     ^
  error generated.
 host C: libneo_util <= external/clearsilver/util/ulist.c
 make: *** [out/host/darwin-x86/obj/SHARED_LIBRARIES/libneo_util_intermediates/neo_files.o] Error
 make: *** Waiting for unfinished jobs....
 external/clearsilver/java-jni/j_neo_util.c::: error: expected expression
     return nerr_raise(NERR_ASSERT,
            ^
 external/clearsilver/java-jni/../util/neo_err.h::: note: expanded from macro
       'nerr_raise'
    nerr_raisef(__PRETTY_FUNCTION__,__FILE__,__LINE__,e,f,__VA_ARGS__)
                                                                     ^
 external/clearsilver/java-jni/j_neo_util.c::: error: expected expression
     return nerr_raise(NERR_ASSERT,
            ^
 external/clearsilver/java-jni/../util/neo_err.h::: note: expanded from macro
       'nerr_raise'
    nerr_raisef(__PRETTY_FUNCTION__,__FILE__,__LINE__,e,f,__VA_ARGS__)
                                                                     ^
  errors generated.
 make: *** [out/host/darwin-x86/obj/SHARED_LIBRARIES/libclearsilver-jni_intermediates/j_neo_util.o] Error
 external/clearsilver/util/ulist.c::: error: expected expression
     return nerr_raise(NERR_NOMEM, "Unable to create ULIST: Out of memory");
            ^
 external/clearsilver/util/neo_err.h::: note: expanded from macro
       'nerr_raise'
    nerr_raisef(__PRETTY_FUNCTION__,__FILE__,__LINE__,e,f,__VA_ARGS__)
                                                                     ^
 external/clearsilver/util/ulist.c::: error: expected expression
     return nerr_raise(NERR_NOMEM, "Unable to create ULIST: Out of memory");
            ^
 external/clearsilver/util/neo_err.h::: note: expanded from macro
       'nerr_raise'
    nerr_raisef(__PRETTY_FUNCTION__,__FILE__,__LINE__,e,f,__VA_ARGS__)
                                                                     ^
 external/clearsilver/util/ulist.c::: error: expected expression
     return nerr_raise(NERR_OUTOFRANGE, "uListPop: empty list");
            ^
 external/clearsilver/util/neo_err.h::: note: expanded from macro
       'nerr_raise'
    nerr_raisef(__PRETTY_FUNCTION__,__FILE__,__LINE__,e,f,__VA_ARGS__)
                                                                     ^
  errors generated.
 make: *** [out/host/darwin-x86/obj/SHARED_LIBRARIES/libneo_util_intermediates/ulist.o] Error 

以“error: expected expression return nerr_raise(NERR_ASSERT,” 为keyword找到：

https://groups.google.com/forum/#!msg/android-building/Vhw56NONaAM/GLfo0yfnsB4J

这贴里面这位Josh老兄给出的解法：

The following should fix this:

 $ sudo mv /usr/bin/cc /usr/bin/cc.bak
 $ sudo mv /usr/bin/c++ /usr/bin/c++.bak
 $ sudo ln -s /usr/bin/llvm-gcc-4.2 /usr/bin/cc
 $ sudo ln -s /usr/bin/llvm-g++-4.2 /usr/bin/c++

哦，原来是OSX下默认的compiler指向的问题， AOSP要使用gcc和g++，而原始的link指向是：

cc->clang

c++->clang++

（Clang： http://en.wikipedia.org/wiki/Clang）

所以我们需要将之前的link断开， 设置为gcc和g++。

 $ sudo rm /usr/bin/cc /usr/bin/c++
 $ sudo ln -s /usr/bin/llvm-gcc-4.2 /usr/bin/cc
 $ sudo ln -s /usr/bin/llvm-g++-4.2 /usr/bin/c++

问题解决。