Question

我正在尝试编译程序，但是当我运行make install时出现以下错误。

gcc -fPIC -O3 -g -O2 -o treeviewer -L/usr/include -lm -lpng -ljpeg -lgd treeviewer.o tree.o fileio.o tree.o: 
In function `drawImage':
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:587: undefined reference to `gdFontMediumBold'
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:587: undefined reference to `gdImageString'
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:602: undefined reference to `gdImageLine'
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:610: undefined reference to `gdImageLine'
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:620: undefined reference to `gdImageFilledRectangle'
tree.o: In function `TreeToImage':
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:477: undefined reference to `gdFontMediumBold'
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:526: undefined reference to `gdImageCreate'
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:527: undefined reference to `gdImageColorAllocate'
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:528: undefined reference to `gdImageColorAllocate'
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:529: undefined reference to `gdImageColorAllocate'
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:530: undefined reference to `gdImageColorAllocate'
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:531: undefined reference to `gdImageColorAllocate'
tree.o:/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:532: more undefined references to `gdImageColorAllocate' follow
tree.o: In function `TreeToImage':
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:548: undefined reference to `gdImagePng'
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:552: undefined reference to `gdImageDestroy'
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:543: undefined reference to `gdImageJpeg'
tree.o: In function `printTreeInfo':
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:642: undefined reference to `gdFontMediumBold'
tree.o: In function `drawImage':
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:627: undefined reference to `gdImageRectangle'
/home/localadmin/codehop-dev/i-codehop/treeviewer/tree.c:624: undefined reference to `gdImageFilledRectangle'
collect2: error: ld returned 1 exit status
make: *** [treeviewer] Error 1

我已使用commmand libgd安装了sudo apt-get -y install libgd2-xpm-dev build-essential。文件夹/usr/include包含文件gd.h。谁能告诉我我错过了什么？提前谢谢。

Answer 1

如果libgd.a不在gcc的默认目录列表中，您可能需要列出-L所在的目录{/ 1}}。

Answer 2

通过更改

解决了这个问题

gcc -fPIC -O3 -g -O2 -o treeviewer -L/usr/include -lm -lpng -ljpeg -lgd treeviewer.o tree.o fileio.o tree.o

到

gcc -fPIC -O3 -g -O2 treeviewer.o tree.o fileio.o tree.o -L/usr/include -lm -lpng -ljpeg -lgd -o treeviewer

gcc undefined对gd函数的引用

2 个答案: