Databases
StackOverflow2013
Postsdbo
POStatic and Dynamic/Shared Linking with MinGW
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POStatic and Dynamic/Shared Linking with MinGW
    primarykey
    data
    text
    <p>I want to start with a simple linking usage to explain my problem. Lets assume that there is a library <code>z</code> which could be compiled to shared library libz.dll(D:/libs/z/shared/libz.dll) or to static library libz.a (D:/libs/z/static/libz.a).</p> <p>Let I want to link against it, then I do this: </p> <pre><code>gcc -o main.exe main.o -LD:/libs/z/static -lz </code></pre> <p>According to <a href="http://gcc.gnu.org/onlinedocs/gcc/Link-Options.html">this documentation</a>, gcc would search for libz.a, which is </p> <blockquote> <p>archive files whose members are object files</p> </blockquote> <p>I also can do the following:</p> <pre><code>gcc -o main.exe main.o -LD:/libs/z/shared -lz </code></pre> <p>It is not mentioned in the documentation above that <code>-l</code> flag will search for <code>lib&lt;name&gt;.so</code>.</p> <p>What will happen if I libz.a and libz.dll will be in the same directory? How the library will be linked with a program? Why I need the flags <code>-Wl,-Bstatic</code> and <code>-Wl,-Bdynamic</code> if <code>-l</code> searches both for shared and static libraries?</p> <p>Why some developers provide .a files with .dll files for the same modules, if I compile a shared library distribution?</p> <p>For example, Qt provides .dll files in bin directory with .a files in lib directory. Is it the same library, but built like shared and static, respectively? Or .a files are some kind of dummy libraries which provide linking with shared libraries, where there are real library implementations?</p> <p>Another example is OpenGL library on Windows. Why every compiler must provide the static OpenGL lib like libopengl32.a in MingW?</p> <p>What are files with .dll.a and .la extensions used for?</p> <p>P.S. There are a lot of questions here, but I think each one depends on the previous one and there is no need to split them into several questions.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USAlexander Shukaev
    1. USYuki
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POStatic and Dynamic/Shared Linking with MinGW
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POStatic and Dynamic/Shared Linking with MinGW
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POStatic and Dynamic/Shared Linking with MinGW
      1. USuser14416
      1. VTFavorite
    1. COLet's take the cygwin example: it is my understanding, that programs compiled with cygwin need a certain dll to run. The dll is bound to a certain license (one of the free ones) and has to be present on the host system for the program. If you as a developer forget to ship it along with the program, the program won't run. Another example is version conflicting DLLs (ie opengl). every system has different capabilities and therefore different implementations of certain DLLs. So sometimes the developers like to use the correct library version => static linked.
      singulars
      1. POStatic and Dynamic/Shared Linking with MinGW
      1. USscones
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload