我目前正在运行Ubuntu 12.04。 我希望安装This Package 我已经安装了包： ＆＃39; fftw2＆＃39;，＆＃39; fftw-dev＆＃39;，＆＃39; fftw-doc＆＃39;，＆＃39; fftw-3.3.4＆＃39;
然而，当我尝试root@ubuntu:~/spectrum-master# make时：
cc -lm -lasound -L/usr/lib/x86_64-linux-gnu -lSDL -lfftw3f -lm spectrum.o mmap_file.o pcm.o wav.o alsa.o window.o stft.o cqt.o trans.o -o spectrum
spectrum.o: In function handle_events': /home/userKum/spectrum-master/spectrum.c:27: undefined reference toSDL_PollEvent'
spectrum.o: In function srgb': /home/userKum/spectrum-master/spectrum.c:78: undefined reference to__powf_finite'
/home/userKum/spectrum-master/spectrum.c:76: undefined reference to __powf_finite' /home/userKum/spectrum-master/spectrum.c:77: undefined reference to__powf_finite'
spectrum.o: In function main': /home/userKum/spectrum-master/spectrum.c:126: undefined reference toSDL_Init'
/home/userKum/spectrum-master/spectrum.c:127: undefined reference to SDL_SetVideoMode' /home/userKum/spectrum-master/spectrum.c:143: undefined reference toSDL_WM_SetCaption'
/home/userKum/spectrum-master/spectrum.c:144: undefined reference to SDL_EnableKeyRepeat' /home/userKum/spectrum-master/spectrum.c:199: undefined reference to__log10f_finite'
/home/userKum/spectrum-master/spectrum.c:157: undefined reference to SDL_Flip' /home/userKum/spectrum-master/spectrum.c:158: undefined reference toSDL_Delay'
alsa.o: In function write_alsa': /home/userKum/spectrum-master/alsa.c:71: undefined reference tosnd_pcm_writei'
/home/userKum/spectrum-master/alsa.c:72: undefined reference to snd_pcm_prepare' alsa.o: In functionread_alsa':
/home/userKum/spectrum-master/alsa.c:54: undefined reference to snd_pcm_readi' /home/userKum/spectrum-master/alsa.c:55: undefined reference tosnd_pcm_prepare'
alsa.o: In function close_alsa': /home/userKum/spectrum-master/alsa.c:26: undefined reference tosnd_pcm_drain'
/home/userKum/spectrum-master/alsa.c:27: undefined reference to snd_pcm_close' alsa.o: In functionopen_alsa_read':
/home/userKum/spectrum-master/alsa.c:92: undefined reference to snd_pcm_hw_params_sizeof' /home/userKum/spectrum-master/alsa.c:92: undefined reference tosnd_pcm_hw_params_sizeof'
/home/userKum/spectrum-master/alsa.c:94: undefined reference to snd_pcm_open' /home/userKum/spectrum-master/alsa.c:100: undefined reference tosnd_pcm_hw_params_any'
/home/userKum/spectrum-master/alsa.c:107: undefined reference to snd_pcm_hw_params_set_access' /home/userKum/spectrum-master/alsa.c:114: undefined reference tosnd_pcm_hw_params_set_format'
/home/userKum/spectrum-master/alsa.c:121: undefined reference to snd_pcm_hw_params_set_rate_resample' /home/userKum/spectrum-master/alsa.c:130: undefined reference tosnd_pcm_hw_params_set_rate_min'
/home/userKum/spectrum-master/alsa.c:109: undefined reference to snd_pcm_close' /home/userKum/spectrum-master/alsa.c:137: undefined reference tosnd_pcm_hw_params'
/home/userKum/spectrum-master/alsa.c:144: undefined reference to snd_pcm_hw_params_get_rate' /home/userKum/spectrum-master/alsa.c:151: undefined reference tosnd_pcm_hw_params_get_channels'
alsa.o: In function open_alsa_write': /home/userKum/spectrum-master/alsa.c:177: undefined reference tosnd_pcm_hw_params_sizeof'
/home/userKum/spectrum-master/alsa.c:177: undefined reference to snd_pcm_hw_params_sizeof' /home/userKum/spectrum-master/alsa.c:179: undefined reference tosnd_pcm_open'
/home/userKum/spectrum-master/alsa.c:185: undefined reference to snd_pcm_hw_params_any' /home/userKum/spectrum-master/alsa.c:192: undefined reference tosnd_pcm_hw_params_set_access'
/home/userKum/spectrum-master/alsa.c:199: undefined reference to snd_pcm_hw_params_set_format' /home/userKum/spectrum-master/alsa.c:206: undefined reference tosnd_pcm_hw_params_set_rate_resample'
/home/userKum/spectrum-master/alsa.c:213: undefined reference to snd_pcm_hw_params_set_rate_near' /home/userKum/spectrum-master/alsa.c:218: undefined reference tosnd_pcm_hw_params_set_channels_near'
/home/userKum/spectrum-master/alsa.c:223: undefined reference to snd_pcm_hw_params' /home/userKum/spectrum-master/alsa.c:194: undefined reference tosnd_pcm_close'
window.o: In function sinc': /home/userKum/spectrum-master/window.c:14: undefined reference tosinf'
window.o: In function hann': /home/userKum/spectrum-master/window.c:24: undefined reference tocosf'
window.o: In function hamming': /home/userKum/spectrum-master/window.c:29: undefined reference tocosf'
window.o: In function sinc': /home/userKum/spectrum-master/window.c:14: undefined reference tosinf'
window.o: In function gauss': /home/userKum/spectrum-master/window.c:38: undefined reference to__expf_finite'
stft.o: In function free_stft': /home/userKum/spectrum-master/stft.c:44: undefined reference tofftwf_destroy_plan'
stft.o: In function get_stft': /home/userKum/spectrum-master/stft.c:38: undefined reference tocabsf'
stft.o: In function create_stft': /home/userKum/spectrum-master/stft.c:66: undefined reference tofftwf_plan_dft_r2c_1d'
stft.o: In function slide_stft': /home/userKum/spectrum-master/stft.c:31: undefined reference tofftwf_execute'
cqt.o: In function get_cqt': /home/userKum/spectrum-master/cqt.c:33: undefined reference tocabsf'
cqt.o: In function free_cqt': /home/userKum/spectrum-master/cqt.c:47: undefined reference tofftwf_destroy_plan'
cqt.o: In function create_cqt': /home/userKum/spectrum-master/cqt.c:65: undefined reference to__logf_finite'
/home/userKum/spectrum-master/cqt.c:65: undefined reference to __expf_finite' /home/userKum/spectrum-master/cqt.c:66: undefined reference to__log2_finite'
/home/userKum/spectrum-master/cqt.c:87: undefined reference to fftwf_plan_dft_1d' /home/userKum/spectrum-master/cqt.c:98: undefined reference tocexpf'
/home/userKum/spectrum-master/cqt.c:103: undefined reference to fftwf_execute' /home/userKum/spectrum-master/cqt.c:57: undefined reference tocabsf'
/home/userKum/spectrum-master/cqt.c:57: undefined reference to cabsf' /home/userKum/spectrum-master/cqt.c:115: undefined reference tocabsf'
/home/userKum/spectrum-master/cqt.c:117: undefined reference to cabsf' /home/userKum/spectrum-master/cqt.c:117: undefined reference tocabsf'
/home/userKum/spectrum-master/cqt.c:57: undefined reference to __powf_finite' /home/userKum/spectrum-master/cqt.c:139: undefined reference tofftwf_destroy_plan'
/home/userKum/spectrum-master/cqt.c:146: undefined reference to fftwf_plan_dft_r2c_1d' cqt.o: In functionslide_cqt':
/home/userKum/spectrum-master/cqt.c:30: undefined reference to `fftwf_execute'
collect2: ld returned 1 exit status
make: *** [spectrum] Error 1
我不知道这些未定义的引用是什么......它看起来在编译期间缺少与'-lasound'的链接。我该怎么办才能解决这个问题？
根据一些观众的要求，MakeFile如下：
CFLAGS = -g -D_GNU_SOURCE=1 -W -Wall -O3 -std=c99 -fno-math-errno -ffinite-math-only -fno-rounding-math -fno-signaling-nans -fno-trapping-math -fcx-limited-range -fsingle-precision-constant $(shell sdl-config --cflags) $(shell pkg-config fftw3f --cflags)
LDFLAGS = -lm -lasound $(shell sdl-config --libs) $(shell pkg-config fftw3f --libs)
all: spectrum
clean:
rm -f spectrum *.o
spectrum: spectrum.o mmap_file.o pcm.o wav.o alsa.o window.o stft.o cqt.o trans.o
答案 0 :(得分：0)
另一个经典案例“图书馆需要追随对象”：
您的库，由
定义LDFLAGS = -lm -lasound $(shell sdl-config --libs) $(shell pkg-config fftw3f --libs)
鉴于（根据此处），链接规则是：
$(CC) $(LDFLAGS) n.o $(LOADLIBES) $(LDLIBS)
我希望
LDLIBS = -lm -lasound $(shell sdl-config --libs) $(shell pkg-config fftw3f --libs)
可以做到这一点，虽然我更愿意实际编写自己的链接器行，因为我不可避免地想要确切知道链接的是什么......
（Unix链接器在处理库时相当简单，所以如果将-lsomething x.o列入链接器，链接器将不会从-lsomething中获取任何内容，并抱怨somethingFunc1（可以是在libsomething.a中找不到，因为x.o之后找不到它。