安装环境：
- mac osx EI Capitan
- python 2.7.6
pip安装gevent过程中, 出现以下错误(错误代码类似):
clang -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I /opt/local/include -L /opt/local/lib -U__llvm__ -DLIBEV_EMBED=1 -DEV_COMMON= -DEV_CLEANUP_ENABLE=0 -DEV_EMBED_ENABLE=0 -DEV_PERIODIC_ENABLE=0 -Ibuild/temp.macosx-10.11-x86_64-2.7/libev -Ilibev -I/usr/local/include -I/usr/local/opt/openssl/include -I/usr/local/opt/sqlite/include -I/usr/local/Cellar/python/2.7.10_2/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c gevent/gevent.core.c -o build/temp.macosx-10.11-x86_64-2.7/gevent/gevent.core.o
clang: warning: argument unused during compilation: '-L/opt/local/lib'
In file included from gevent/gevent.core.c:249:
In file included from gevent/libev.h:2:
libev/ev.c:483:48: warning: '/*' within block comment [-Wcomment]
/*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
^
libev/ev.c:1029:42: error: '_Noreturn' keyword must precede function declarator
ecb_inline void ecb_unreachable (void) ecb_noreturn;
^1
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_Noreturn
libev/ev.c:832:26: note: expanded from macro 'ecb_noreturn'
#define ecb_noreturn _Noreturn
^
libev/ev.c:1625:31: warning: 'extern' variable has an initializer [-Wextern-initializer]
EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
^
libev/ev.c:1796:7: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:1807:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:1934:7: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
In file included from gevent/gevent.core.c:249:
In file included from gevent/libev.h:2:
In file included from libev/ev.c:2484:
libev/ev_kqueue.c:50:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
In file included from gevent/gevent.core.c:249:
In file included from gevent/libev.h:2:
In file included from libev/ev.c:2490:
libev/ev_poll.c:66:7: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (struct pollfd, polls, pollmax, pollcnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:3648:34: warning: '&' within '|' [-Wbitwise-op-parentheses]
fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
~~~~~~~~~~^~~~~~~~~~~~~ ~
libev/ev.c:3648:34: note: place parentheses around the '&' expression to silence this warning
fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
^
( )
libev/ev.c:3687:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:4367:5: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:4407:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:4445:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:4592:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:4675:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
14 warnings and 1 error generated.
error: command 'clang' failed with exit status 1
----------------------------------------
Failed building wheel for gevent
Failed to build gevent
Installing collected packages: gevent
Running setup.py install for gevent
Complete output from command /usr/local/opt/python/bin/python2.7 -c "import setuptools, tokenize;__file__='/private/var/folders/q8/1c24n_wj6kzc6kgl7629pwyh0000gn/T/pip-build-3zCPVx/gevent/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/q8/1c24n_wj6kzc6kgl7629pwyh0000gn/T/pip-9VpZCX-record/install-record.txt --single-version-externally-managed --compile:
running install
running build
running build_py
running build_ext
building 'gevent.core' extension
clang -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I /opt/local/include -L /opt/local/lib -U__llvm__ -DLIBEV_EMBED=1 -DEV_COMMON= -DEV_CLEANUP_ENABLE=0 -DEV_EMBED_ENABLE=0 -DEV_PERIODIC_ENABLE=0 -Ibuild/temp.macosx-10.11-x86_64-2.7/libev -Ilibev -I/usr/local/include -I/usr/local/opt/openssl/include -I/usr/local/opt/sqlite/include -I/usr/local/Cellar/python/2.7.10_2/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c gevent/gevent.core.c -o build/temp.macosx-10.11-x86_64-2.7/gevent/gevent.core.o
clang: warning: argument unused during compilation: '-L/opt/local/lib'
In file included from gevent/gevent.core.c:249:
In file included from gevent/libev.h:2:
libev/ev.c:483:48: warning: '/*' within block comment [-Wcomment]
/*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
^
libev/ev.c:1029:42: error: '_Noreturn' keyword must precede function declarator
ecb_inline void ecb_unreachable (void) ecb_noreturn;
^
_Noreturn
libev/ev.c:832:26: note: expanded from macro 'ecb_noreturn'
#define ecb_noreturn _Noreturn
^
libev/ev.c:1625:31: warning: 'extern' variable has an initializer [-Wextern-initializer]
EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
^
libev/ev.c:1796:7: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:1807:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:1934:7: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
In file included from gevent/gevent.core.c:249:
In file included from gevent/libev.h:2:
In file included from libev/ev.c:2484:
libev/ev_kqueue.c:50:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
In file included from gevent/gevent.core.c:249:
In file included from gevent/libev.h:2:
In file included from libev/ev.c:2490:
libev/ev_poll.c:66:7: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (struct pollfd, polls, pollmax, pollcnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:3648:34: warning: '&' within '|' [-Wbitwise-op-parentheses]
fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
~~~~~~~~~~^~~~~~~~~~~~~ ~
libev/ev.c:3648:34: note: place parentheses around the '&' expression to silence this warning
fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
^
( )
libev/ev.c:3687:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:4367:5: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:4407:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:4445:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:4592:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
libev/ev.c:4675:3: warning: unused variable 'ocur_' [-Wunused-variable]
array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
^
libev/ev.c:1758:22: note: expanded from macro 'array_needsize'
int ecb_unused ocur_ = (cur); \
^
14 warnings and 1 error generated.
error: command 'clang' failed with exit status 1
----------------------------------------
Command "/usr/local/opt/python/bin/python2.7 -c "import setuptools, tokenize;__file__='/private/var/folders/q8/1c24n_wj6kzc6kgl7629pwyh0000gn/T/pip-build-3zCPVx/gevent/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/q8/1c24n_wj6kzc6kgl7629pwyh0000gn/T/pip-9VpZCX-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/q8/1c24n_wj6kzc6kgl7629pwyh0000gn/T/pip-build-3zCPVx/gevent
系统升级前，这样安装是没问题的, 升级后就悲剧了.
通过强大的stackoverflow，几番查询后，问题终于解决了，记录一下做备用。
解决方案如下:
CFLAGS='-std=c99' pip install gevent
主要原因是, osx10.11系统中, clang默认采用c11取代了之前的c99; 在这里, 我们临时退回c99即可.