g++ 找不到已安装的库

Question

我正在尝试编译需要所需库 libmusicxml 的示例文件。

我按照他们说的（cmake、make、make install）编译了库，它制作并安装了一堆文件：

Install the project...
-- Install configuration: ""
-- Installing: /usr/local/lib/libmusicxml2.so.3.00
-- Installing: /usr/local/lib/libmusicxml2.so
-- Installing: /usr/local/include/libmusicxml/musicxmlfactory.h
-- Installing: /usr/local/include/libmusicxml/sortvisitor.h
-- Installing: /usr/local/include/libmusicxml/xmlreader.h
... etc

现在我想编译他们的示例文件之一，所以我运行 g+ filename.cpp 它给了我以下错误：

libmusicxml.h: No such file or directory

这是否意味着它没有看到 /usr/local 中的库？我可以在某处指定吗？设置路径什么的？

我已经确保从 here 获得了最新版本的 libmusicxml 库并做了同样的事情（cmake 后接 make）。

当我转到给定的示例并尝试制作一个（使用提供的 make 文件，开发人员可以使用）时，它不想这样做：

dorien@XP:~/bin/libmusicxml-master/samples$ make
gcc -g -O3 -Wall -Wuninitialized -I../src/elements -I../src/interface -I../src/files -I../src/lib -I../src/parser -I../src/visitors -I../src/guido -I../src/operations countnotes.cpp ../libmusicxml2.a -lstdc++ -o countnotes
gcc: error: ../libmusicxml2.a: No such file or directory
Makefile:14: recipe for target 'countnotes' failed

-> 我试图找到 libmusicxml2.a 但它似乎不存在。

当我运行xml2guido（包的根目录下好像有编译好的版本），我得到：

xml2guido: error while loading shared libraries: libmusicxml2.so.3.00: cannot open shared object file: No such file or directory

但是，同目录下有一个libmusicxml2.so.3.00

可能是包链接不正确？或者关于丢失的 .a 文件？

我认为它构建正确：

 make
[ 73%] Built target musicxml2
[ 75%] Built target RandomMusic
[ 78%] Built target countnotes
[ 80%] Built target partsummary
[ 82%] Built target readunrolled
[ 85%] Built target xml2guido
[ 87%] Built target xml2midi
[ 90%] Built target xmlclone
[ 92%] Built target xmlfactory
[ 95%] Built target xmliter
[ 97%] Built target xmlread
[100%] Built target xmltranspose

dorien@XP:~/bin/libmusicxml-master$ sudo make install
[ 73%] Built target musicxml2
[ 75%] Built target RandomMusic
[ 78%] Built target countnotes
[ 80%] Built target partsummary
[ 82%] Built target readunrolled
[ 85%] Built target xml2guido
[ 87%] Built target xml2midi
[ 90%] Built target xmlclone
[ 92%] Built target xmlfactory
[ 95%] Built target xmliter
[ 97%] Built target xmlread
[100%] Built target xmltranspose
Install the project...
-- Install configuration: ""
-- Up-to-date: /usr/local/lib/libmusicxml2.so.3.00
-- Up-to-date: /usr/local/lib/libmusicxml2.so
-- Up-to-date: /usr/local/include/libmusicxml/musicxmlfactory.h
-- Up-to-date: /usr/local/include/libmusicxml/sortvisitor.h
-- Up-to-date: /usr/local/include/libmusicxml/xmlreader.h
-- Up-to-date: /usr/local/include/libmusicxml/xmlfile.h
-- Up-to-date: /usr/local/include/libmusicxml/libmusicxml.h
-- Up-to-date: /usr/local/include/libmusicxml/unrolled_xml_tree_browser.h
-- Up-to-date: /usr/local/include/libmusicxml/xml.h
-- Up-to-date: /usr/local/include/libmusicxml/elements.h
-- Up-to-date: /usr/local/include/libmusicxml/factory.h
-- Up-to-date: /usr/local/include/libmusicxml/types.h
-- Up-to-date: /usr/local/include/libmusicxml/typedefs.h
-- Up-to-date: /usr/local/include/libmusicxml/xml_tree_browser.h
-- Up-to-date: /usr/local/include/libmusicxml/versions.h
-- Up-to-date: /usr/local/include/libmusicxml/exports.h

Answer 1

Does this mean it's not seeing the library in /usr/local?

表示没有找到headerlibmusicxml.h。您没有告诉编译器在 /usr/local/include/libmusicxml.

中查找它

Can I specify this somewhere? Set a path or something?

请参阅编译器的文档。在 gcc 中，包含搜索路径的选项是 -I.

与其从 /usr/local/include/libmusicxml/ 搜索 header libmusicxml.h，我建议包括 libmusicxml/libmusicxml.h 并从 /usr/local/include 搜索。这会更简单，因为默认情况下 g++ 从 /usr/local/include 搜索，因此不需要编译器选项。

Answer 2

库（和 headers）直到我运行才被识别：

export LD_LIBRARY_PATH=/addressto/libmusicxml-master

这就解决了。

g++ 找不到已安装的库

g++ can't find installed library

c++

compilation

g++

path