"usr/bin/ld: cannot find -l
When compiling a program, encountering the error "usr/bin/ld: cannot find -l
1. Verify Library Existence:
Ensure that the library you are referencing exists in the specified location. Run the following command to list all available libraries:
ldconfig -p | grep <nameOfTheLibrary>
2. Symbolic Link Validation:
If you have created a symbolic link to the library, confirm that it is correct and points to the actual library file. Use the "ls -l" command to view the link:
ls -l <symbolicLink>
3. Verbose Linker Output:
To determine the specific files the linker is searching for, run it in verbose mode. Append the "--verbose" flag to the linking command:
ld -l<nameOfTheLibrary> --verbose
The output will show all potential directories and files that the linker is considering.
4. Install Missing Libraries:
If the library does not exist or cannot be located, install it using your package manager. For example, on a Debian-based system:
sudo apt-get install <nameOfTheLibrary>-dev
5. Add Library Path to Command:
In some cases, the linker may not be able to find the library automatically. You can manually specify the library path using the "-L" flag:
g++ -o myprogram myprogram.cpp -l<nameOfTheLibrary> -L/path/to/library
Example:
To resolve the issue described in the referenced problem, where the linker could not find the ZLIB library:
- Ensure that the zlib.so file exists in the specified directory or create a symlink to the versioned file (zlib.so.N).
- Run ld -lzlib --verbose to verify the files being searched for.
- If zlib.so is missing, create a symlink to the existing versioned file:
sudo ln -s /usr/lib/libz.so.1.2.8 /usr/lib/libzlib.so
The above is the detailed content of Why Can't My Linker Find `-l`?. For more information, please follow other related articles on the PHP Chinese website!

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