아마 2.4와 2.6이 혼합되어 설치되어있고, 2.6이 정상설치가 되지 않은듯 싶다.
옵션에 따라서 이러한 오류가 발생했다.
# gcc py.c -I/usr/local/include/python2.6 -L/usr/local/lib/libpython2.6.a
/tmp/cc88iTD7.o: In function `main':
py.c:(.text+0x12): undefined reference to `Py_Initialize'
py.c:(.text+0x26): undefined reference to `PyRun_SimpleStringFlags'
py.c:(.text+0x2b): undefined reference to `Py_Finalize'
collect2: ld returned 1 exit status
# gcc py.c -I/usr/local/include/python2.6 -lpython2.6
/usr/local/lib/libpython2.6.a(posixmodule.o): In function
`posix_tmpnam':
./Modules/posixmodule.c:7180: warning: the use of `tmpnam_r' is
dangerous, better use `mkstemp'
/usr/local/lib/libpython2.6.a(posixmodule.o): In function
`posix_tempnam':
./Modules/posixmodule.c:7135: warning: the use of `tempnam' is
dangerous, better use `mkstemp'
/usr/local/lib/libpython2.6.a(signalmodule.o): In function
`timeval_from_double':
./Modules/signalmodule.c:106: undefined reference to `floor'
./Modules/signalmodule.c:107: undefined reference to `fmod'
./Modules/signalmodule.c:106: undefined reference to `floor'
./Modules/signalmodule.c:107: undefined reference to `fmod'
/usr/local/lib/libpython2.6.a(floatobject.o): In function `float_pow':
Objects/floatobject.c:972: undefined reference to `pow'
/usr/local/lib/libpython2.6.a(floatobject.o): In function
`float_divmod':
Objects/floatobject.c:856: undefined reference to `fmod'
/usr/local/lib/libpython2.6.a(floatobject.o): In function `float_rem':
Objects/floatobject.c:834: undefined reference to `fmod'
/usr/local/lib/libpython2.6.a(longobject.o): In function
`PyLong_FromString':
Objects/longobject.c:1610: undefined reference to `log'
Objects/longobject.c:1610: undefined reference to `log'
/usr/local/lib/libpython2.6.a(dynload_shlib.o): In function
`_PyImport_GetDynLoadFunc':
Python/dynload_shlib.c:94: undefined reference to `dlsym'
Python/dynload_shlib.c:130: undefined reference to `dlopen'
Python/dynload_shlib.c:141: undefined reference to `dlsym'
Python/dynload_shlib.c:133: undefined reference to `dlerror'
/usr/local/lib/libpython2.6.a(thread.o): In function
`_pythread_pthread_set_stacksize':
Python/thread_pthread.h:519: undefined reference to
`pthread_attr_setstacksize'
/usr/local/lib/libpython2.6.a(thread.o): In function
`PyThread_release_lock':
Python/thread_pthread.h:374: undefined reference to `sem_post'
/usr/local/lib/libpython2.6.a(thread.o): In function
`PyThread_free_lock':
Python/thread_pthread.h:320: undefined reference to `sem_destroy'
/usr/local/lib/libpython2.6.a(thread.o): In function
`PyThread_allocate_lock':
Python/thread_pthread.h:296: undefined reference to `sem_init'
/usr/local/lib/libpython2.6.a(thread.o): In function
`PyThread_acquire_lock':
Python/thread_pthread.h:351: undefined reference to `sem_trywait'
Python/thread_pthread.h:349: undefined reference to `sem_wait'
/usr/local/lib/libpython2.6.a(thread.o): In function
`PyThread_start_new_thread':
Python/thread_pthread.h:171: undefined reference to
`pthread_attr_setstacksize'
Python/thread_pthread.h:181: undefined reference to `pthread_create'
Python/thread_pthread.h:197: undefined reference to `pthread_detach'
/usr/local/lib/libpython2.6.a(thread.o): In function
`PyThread_release_lock':
Python/thread_pthread.h:374: undefined reference to `sem_post'
Python/thread_pthread.h:374: undefined reference to `sem_post'
Python/thread_pthread.h:374: undefined reference to `sem_post'
/usr/local/lib/libpython2.6.a(thread.o): In function
`PyThread_allocate_lock':
Python/thread_pthread.h:296: undefined reference to `sem_init'
Python/thread_pthread.h:296: undefined reference to `sem_init'
/usr/local/lib/libpython2.6.a(posixmodule.o): In function
`posix_forkpty':
posixmodule.c:(.text+0x2653): undefined reference to `forkpty'
/usr/local/lib/libpython2.6.a(posixmodule.o): In function
`posix_openpty':
posixmodule.c:(.text+0x26fc): undefined reference to `openpty'
/usr/local/lib/libpython2.6.a(complexobject.o): In function `_Py_c_abs':
Objects/complexobject.c:214: undefined reference to `hypot'
/usr/local/lib/libpython2.6.a(complexobject.o): In function `_Py_c_pow':
Objects/complexobject.c:143: undefined reference to `hypot'
Objects/complexobject.c:144: undefined reference to `pow'
Objects/complexobject.c:145: undefined reference to `atan2'
Objects/complexobject.c:151: undefined reference to `cos'
Objects/complexobject.c:152: undefined reference to `sin'
Objects/complexobject.c:148: undefined reference to `exp'
Objects/complexobject.c:149: undefined reference to `log'
collect2: ld returned 1 exit status
컴파일시 각종 헤더들의 위치, 라이브러리들의위치
그리고 설치할 위치들을 설정하고,
컴파일할 프로그램의 세부 패키지를 설정한다.
아래는 ffmpeg의 configure --help 내용중 일부이다.
Standard options: --prefix=PREFIX install in PREFIX [] --bindir=DIR install binaries in DIR [PREFIX/bin] --datadir=DIR install data files in DIR [PREFIX/share/ffmpeg] --libdir=DIR install libs in DIR [PREFIX/lib] --shlibdir=DIR install shared libs in DIR [PREFIX/lib] --incdir=DIR install includes in DIR [PREFIX/include] --mandir=DIR install man page in DIR [PREFIX/share/man]
Advanced options (experts only): --enable-cross-compile assume a cross-compiler is used
--arch=ARCH select architecture []
--target-os=OS compiler targets OS []
--cross-prefix=PREFIX use PREFIX for compilation tools []
--source-path=PATH path to source code
[/home/morpheuz/st7109/target_ori/root/ffmpeg] --sysroot=PATH root of cross-build tree --sysinclude=PATH location of cross-build system headers --target-exec=CMD command to run executables on target --target-path=DIR path to view of build directory on target --nm=NM use nm tool --as=AS use assembler AS [] --cc=CC use C compiler CC [gcc] --ld=LD use linker LD --host-cc=HOSTCC use host C compiler HOSTCC --host-cflags=HCFLAGS use HCFLAGS when compiling for host --host-ldflags=HLDFLAGS use HLDFLAGS when linking for host --host-libs=HLIBS use libs HLIBS when linking for host --extra-cflags=ECFLAGS add ECFLAGS to CFLAGS [] --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS [] --extra-libs=ELIBS add ELIBS [] --extra-version=STRING version string suffix [] --build-suffix=SUFFIX library name suffix [] --cpu=CPU select the minimum required CPU (affects instruction selection, may crash on older CPUs) --disable-yasm disable use of yasm assembler --enable-pic build position-independent code
이녀석의 경우 arch 와 target-os를 조합해서 cross compiler prefix를 만들어 낸다.
예를들어 sh4-linux의 경우 --enable-cross-compile--arch=sh4 --target-os=linux 라고 하면
자동으로 sh4-linux- 접두를 붙이게 된다.
하지만, target 에만 존재하는 library를 끌어 오려면 어떤 옵션을 써야 하나.. 후우..
x86 계열에서 메모리 팍팍 쓰면서 속도를 향상시켜준다는,
마법의(!?) JIT(Just In Time) compiler 이다.
결론은.. x86이 아니면 안되는군 ㅠ.ㅠ
What you can do with it
In short: run your existing Python software much faster, with no change in your source.
Think of Psyco as a kind of just-in-time (JIT) compiler, a little bit like what exists for other languages, that emit machine code on the fly instead of interpreting your Python program step by step. The difference with the traditional approach to JIT compilers is that Psyco writes several version of the same blocks (a block is a bit of a function), which are optimized by being specialized to some kinds of variables (a "kind" can mean a type, but it is more general). The result is that your unmodified Python programs run faster.
Benefits
2x to 100x speed-ups, typically 4x, with an unmodified Python interpreter and unmodified source code, just a dynamically loadable C extension module.
Drawbacks
Psyco currently uses a lot of memory. It only runs on Intel 386-compatible processors (under any OS) right now. There are some subtle semantic differences (i.e. bugs) with the way Python works; they should not be apparent in most programs.
make -j2
이렇게 컴파일을 하면 동시에 2개의 작업을 실행하여
다소 컴파일 시간이 줄어드는 효과가 있다.
-j jobs 에서 jobs 에 숫자를 넣지 않으면, make가 돌릴수 있는 최대한의 숫자가 제한되지 않는다고 한다.
현재 사용중인 개발환경에서 make 로는 1분 make -j2 / make -j4 에서 40초 걸리는 것으로 봐서
상당히 유용한 옵션으로 생각이 된다.
-j [jobs], --jobs[=jobs]
Specifies the number of jobs (commands) to run simultaneously. If there is more than one -j option, the last one is effective. If the -j option is given without an argument, make will not limit the number of jobs that can run simultaneously.
find는 기본적으로 하위 디렉토리를 뒤지도록 되어있기 때문에
강제로 현재 디렉토리만 검색을 하기 위해서는 옵션을 해주어야 한다.
아쉽게도 non-recursive 이런 옵션은 없고 -maxdepth 숫자
라는 옵션이 존재한다.
예를 들어 현재 디렉토리에서 크기가 0인 파일을 찾기 위해서는 $ find ./ -maxdepth 1-size 0c
이라고 하면된다.
find: warning: you have specified the -maxdepth option after a non-option argument -size, but options are not positional (-maxdepth affects tests specified before it as well as those specified after it). Please specify options before other arguments.
maxdepth는 옵션이고
size는 옵션이 아니므로 순서를 반대로 하면 경고를 발생시킨다.
-maxdepth levels
Descend at most levels (a non-negative integer) levels of directories below the command line arguments. '-maxdepth 0' means only apply the tests and actions to the command line arguments.
