我的小组正在开发一个程序，该程序使用依赖于JPEG库的JasPer库。我的同事创建了一个Makefile，它在构建规则中列出了-ljpeg之前的-ljasper。这在我的同事的计算机上运行良好，但不会在我的计算机上构建：
$ make
cc -DDEBUG compress_image_test.c -o compress_image_test -Wall -ljpeg -ljasper -lm -lcheck
/usr/local/lib/libjasper.a(jpg_dec.o): In function `jpg_decode':
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_dec.c:158: undefined reference to `jpeg_std_error'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_dec.c:159: undefined reference to `jpeg_CreateDecompress'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_dec.c:162: undefined reference to `jpeg_stdio_src'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_dec.c:165: undefined reference to `jpeg_read_header'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_dec.c:168: undefined reference to `jpeg_start_decompress'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_dec.c:190: undefined reference to `jpeg_read_scanlines'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_dec.c:197: undefined reference to `jpeg_finish_decompress'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_dec.c:200: undefined reference to `jpeg_destroy_decompress'
/usr/local/lib/libjasper.a(jpg_enc.o): In function `jpg_encode':
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_enc.c:284: undefined reference to `jpeg_std_error'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_enc.c:285: undefined reference to `jpeg_CreateCompress'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_enc.c:288: undefined reference to `jpeg_stdio_dest'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_enc.c:294: undefined reference to `jpeg_set_defaults'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_enc.c:310: undefined reference to `jpeg_set_quality'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_enc.c:314: undefined reference to `jpeg_default_colorspace'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_enc.c:317: undefined reference to `jpeg_start_compress'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_enc.c:324: undefined reference to `jpeg_write_scanlines'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_enc.c:329: undefined reference to `jpeg_finish_compress'
/cots/jasper-1.900.1/src/libjasper/jpg/jpg_enc.c:330: undefined reference to `jpeg_destroy_compress'
collect2: ld returned 1 exit status
make: *** [compress_image_test] Error 1
两台机器都在运行Ubuntu 12.04。 JasPer和JPEG库是从源代码构建的，不是通过apt-get获得的。
在阅读了另一个堆栈交换帖子lib dependencies and their order后，我尝试更新makefile以将-ljpeg的订单交换到-ljasper之后。这很有用。
所以我的问题是，在另一台机器上的原始订单是否正常，这基本上等同于我的，但它在我的机器上不起作用？
5月5日更新：
这些是我可以在计算机上找到的相关库文件：
/ usr / lib中/ I386-Linux的GNU：
lrwxrwxrwx 1 root root 18 Jun 21 2012 libjasper.so.1 -> libjasper.so.1.0.0
-rw-r--r-- 1 root root 317148 Jan 11 2012 libjasper.so.1.0.0
lrwxrwxrwx 1 root root 16 Nov 22 07:42 libjpeg.so.8 -> libjpeg.so.8.0.2
-rw-r--r-- 1 root root 284436 Nov 22 07:42 libjpeg.so.8.0.2
的/ usr /本地/ lib中：
-rw-r--r-- 1 root root 1361856 May 2 09:14 libjasper.a
-rwxr-xr-x 1 root root 757 May 2 09:14 libjasper.la
-rw-r--r-- 1 root root 1461672 May 2 09:15 libjpeg.a
-rwxr-xr-x 1 root root 918 May 2 09:15 libjpeg.la
lrwxrwxrwx 1 root root 16 May 2 09:15 libjpeg.so -> libjpeg.so.9.1.0
lrwxrwxrwx 1 root root 16 May 2 09:15 libjpeg.so.9 -> libjpeg.so.9.1.0
-rwxr-xr-x 1 root root 955739 May 2 09:15 libjpeg.so.9.1.0
和我的同事计算机上存在的文件相同：
/ usr / lib中/ I386-Linux的GNU：
lrwxrwxrwx 1 root root 18 Oct 29 2013 libjasper.so.1 -> libjasper.so.1.0.0
-rw-r--r-- 1 root root 317148 Jan 11 2012 libjasper.so.1.0.0
lrwxrwxrwx 1 root root 16 Nov 22 07:42 libjpeg.so.8 -> libjpeg.so.8.0.2
-rw-r--r-- 1 root root 284436 Nov 22 07:42 libjpeg.so.8.0.2
的/ usr /本地/ lib中：
-rw-r--r-- 1 root root 1320124 Apr 24 16:01 libjasper.a
-rwxr-xr-x 1 root root 750 Apr 24 16:01 libjasper.la
-rw-r--r-- 1 root root 1462456 Apr 24 16:06 libjpeg.a
-rwxr-xr-x 1 root root 918 Apr 24 16:06 libjpeg.la
lrwxrwxrwx 1 root root 16 Apr 24 16:06 libjpeg.so -> libjpeg.so.9.1.0
lrwxrwxrwx 1 root root 16 Apr 24 16:06 libjpeg.so.9 -> libjpeg.so.9.1.0
-rwxr-xr-x 1 root root 955351 Apr 24 16:06 libjpeg.so.9.1.0
据我所知，两个系统上都存在所有相同的文件和链接。
答案 0 :(得分：1)
您可能正在链接静态库。
对于动态库，整个库都包含在链接中，这将使所有符号可用于后面提到的对象，而对于静态库，只有那些满足当前未定义的归档成员符号被链接，而库的其余部分被忽略。
答案 1 :(得分：0)
动态库有两种可能性：
如果您将LD_LIBRARY_PATH设置为包含其中libjpeg.so可找到的路径，则ld会在找到libjpeg.so时自动搜索libjasper.so libjasper.so需要它。
可以使用-rpath ld选项构建ld。在这种情况下，libjasper.so也会自动在该路径中搜索依赖库。
您可以readelf -d /path/to/libjasper.so找出{{1}}中是否存在rpath。