在用cocos2d-x3.2 + protobuf編譯Android項目的時候，protobuf出現了兩個問題：
1. 首先是config.h找不到，查閱自后說是通過命令或工具生成的，里面的內容根據不同平台是不一樣的（引用一些用到的庫，例如hash_map,hash_set等，和部分宏定義），那么就要在自己手動生成，或者自己創建一個空的config，自己把一些引用到的庫加進去，為了能快速編譯通過，我就自己創建了一個config.h，沒有引用任何庫。
#ifndef _LINUX_CONFIG_H #define _LINUX_CONFIG_H #endif
然后找不到config.h的問題解決了。
2. 然后是error "No suitable threading library available."
定位到common.cc文件中
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN // We only need minimal includes
#include <windows.h>
#define snprintf _snprintf // see comment in strutil.cc
#elif defined(HAVE_PTHREAD)
#include <pthread.h>
#else
#error "No suitable threading library available."
#endif
發現是找不到HAVE_PTHREAD宏定義，導致沒有引用pthread庫，直接用#include <pthread.h>替換#error "No suitable threading library available."這句代碼，又會導致其他文件找不到；那么可能其它地方也引用了HAVE_PTHREAD宏，那這個宏是protobuf庫根據不同平台定義的呢，還是該我們自己加呢，如果是自己加又應該加在哪里呢？
聯想到config文件找不到的問題，猜到可能是config文件中缺少一些代碼，看來不能用空的config，那么就直接在config.h中加上 #define HAVE_PTHREAD 即可。
#ifndef _LINUX_CONFIG_H #define _LINUX_CONFIG_H #define HAVE_PTHREAD #endif
之后編譯通過。。。
如果是有完美強迫症的、或者要求高效率（使用hash_map/unordered_map等），那么就在linux上用configure生成一個config.h吧，下面附上一個完整生成的：
/* config.h. Generated from config.h.in by configure. */ /* config.h.in. Generated from configure.ac by autoheader. */ /* the name of <hash_map> */ #define HASH_MAP_CLASS hash_map /* the location of <unordered_map> or <hash_map> */ #define HASH_MAP_H <ext/hash_map> /* the namespace of hash_map/hash_set */ #define HASH_NAMESPACE std::tr1 /* the name of <hash_set> */ #define HASH_SET_CLASS hash_set /* the location of <unordered_set> or <hash_set> */ #define HASH_SET_H <ext/hash_set> /* Define to 1 if you have the <dlfcn.h> header file. */ #define HAVE_DLFCN_H 1 /* Define to 1 if you have the <fcntl.h> header file. */ #define HAVE_FCNTL_H 1 /* Define to 1 if you have the `ftruncate' function. */ #define HAVE_FTRUNCATE 1 /* define if the compiler has hash_map */ #define HAVE_HASH_MAP 1 /* define if the compiler has hash_set */ #define HAVE_HASH_SET 1 /* Define to 1 if you have the <inttypes.h> header file. */ #define HAVE_INTTYPES_H 1 /* Define to 1 if you have the <limits.h> header file. */ #define HAVE_LIMITS_H 1 /* Define to 1 if you have the <memory.h> header file. */ #define HAVE_MEMORY_H 1 /* Define to 1 if you have the `memset' function. */ #define HAVE_MEMSET 1 /* Define to 1 if you have the `mkdir' function. */ #define HAVE_MKDIR 1 /* Define if you have POSIX threads libraries and header files. */ #define HAVE_PTHREAD 1 /* Define to 1 if you have the <stdint.h> header file. */ #define HAVE_STDINT_H 1 /* Define to 1 if you have the <stdlib.h> header file. */ #define HAVE_STDLIB_H 1 /* Define to 1 if you have the `strchr' function. */ #define HAVE_STRCHR 1 /* Define to 1 if you have the `strerror' function. */ #define HAVE_STRERROR 1 /* Define to 1 if you have the <strings.h> header file. */ #define HAVE_STRINGS_H 1 /* Define to 1 if you have the <string.h> header file. */ #define HAVE_STRING_H 1 /* Define to 1 if you have the `strtol' function. */ #define HAVE_STRTOL 1 /* Define to 1 if you have the <sys/stat.h> header file. */ #define HAVE_SYS_STAT_H 1 /* Define to 1 if you have the <sys/types.h> header file. */ #define HAVE_SYS_TYPES_H 1 /* Define to 1 if you have the <unistd.h> header file. */ #define HAVE_UNISTD_H 1 /* Enable classes using zlib compression. */ /* #undef HAVE_ZLIB */ /* Define to the sub-directory in which libtool stores uninstalled libraries. */ #define LT_OBJDIR ".libs/" /* Name of package */ #define PACKAGE "protobuf" /* Define to the address where bug reports for this package should be sent. */ #define PACKAGE_BUGREPORT "protobuf@googlegroups.com" /* Define to the full name of this package. */ #define PACKAGE_NAME "Protocol Buffers" /* Define to the full name and version of this package. */ #define PACKAGE_STRING "Protocol Buffers 2.5.0" /* Define to the one symbol short name of this package. */ #define PACKAGE_TARNAME "protobuf" /* Define to the home page for this package. */ #define PACKAGE_URL "" /* Define to the version of this package. */ #define PACKAGE_VERSION "2.5.0" /* Define to necessary symbol if this constant uses a non-standard name on your system. */ /* #undef PTHREAD_CREATE_JOINABLE */ /* Define to 1 if you have the ANSI C header files. */ #define STDC_HEADERS 1 /* Enable extensions on AIX 3, Interix. */ #ifndef _ALL_SOURCE # define _ALL_SOURCE 1 #endif /* Enable GNU extensions on systems that have them. */ #ifndef _GNU_SOURCE # define _GNU_SOURCE 1 #endif /* Enable threading extensions on Solaris. */ #ifndef _POSIX_PTHREAD_SEMANTICS # define _POSIX_PTHREAD_SEMANTICS 1 #endif /* Enable extensions on HP NonStop. */ #ifndef _TANDEM_SOURCE # define _TANDEM_SOURCE 1 #endif /* Enable general extensions on Solaris. */ #ifndef __EXTENSIONS__ # define __EXTENSIONS__ 1 #endif /* Version number of package */ #define VERSION "2.5.0" /* Define to 1 if on MINIX. */ /* #undef _MINIX */ /* Define to 2 if the system does not provide POSIX.1 features except with this defined. */ /* #undef _POSIX_1_SOURCE */ /* Define to 1 if you need to in order for `stat' and other things to work. */ /* #undef _POSIX_SOURCE */