How to Build and Use Static Libraries with g ?

Creating Static Libraries with g

In software development, creating static libraries is crucial for organizing and reusing code across multiple applications. This article provides a comprehensive guide on building and using static libraries with g , a widely used C compiler.

Building a Static Library

To build a static library from a set of .cpp and .hpp files, follow these steps:

1. Compile the Object File: First, compile the .cpp file(s) into object files using the -c flag. For example, g -c header.cpp.
2. Create a Static Library: Use the ar utility to create a static library archive (.a file). Include the compiled object file(s) using the rvs flags. For instance, ar rvs header.a header.o.

Using a Static Library

To incorporate a static library into your code, follow these steps:

1. Specify the Library Path: When compiling code that depends on the library, specify the path to the library using the -L flag. For example, g main.cpp -Lpath_to_header_library.
2. Link to the Library: Link the compiled code with the static library using the -l flag. For instance, g main.cpp -Lpath_to_header_library -lheader.

Example

Consider a scenario where you have header.h and header.cpp. You want to create header.a and test it in test.cpp.

1. Create the Object File:

   g++ -c header.cpp

2. Create the Static Library:

   ar rvs header.a header.o

3. Test the Library: In test.cpp, include the header file and link to the library:

   <code class="cpp">#include "header.h"
   ...</code>

   g++ test.cpp -Lpath_to_header_library -lheader

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