47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
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/* This file is part of the sample code and exercises
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* used by the class "Advanced Programming in the UNIX
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* Environment" taught by Jan Schaumann
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* <jschauma@netmeister.org> at Stevens Institute of
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* Technology.
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*
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* This file is in the public domain.
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*
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* You don't have to, but if you feel like
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* acknowledging where you got this code, you may
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* reference me by name, email address, or point
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* people to the course website:
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* https://stevens.netmeister.org/631/
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*/
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/* This simple program can be used to illustrate how shared libraries
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* work. We use function prototypes to forward-declare the 'ldtest'
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* functions, which are implemented in the ldtest[12].c files.
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*
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* Compiling this file alone works, but linking it will fail.
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*
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* Compiling main.c and ldtest[12].c in one step will work.
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*
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* Compiling main.c and ldtest[12].c into object files, then linking them
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* together into an executable will work.
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*
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* You can then also create an archive of the ldtest[12].o files and
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* create a dynamically linked executable from that; likewise, you can
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* then create a statically linked binary using the archive.
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*
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* Finally, you can build a shared library from the ldtest[12].o files and
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* link this program against it.
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*/
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#include <stdio.h>
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void ldtest0(const char *);
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void ldtest1(const char *);
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void ldtest2(const char *);
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int main() {
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ldtest0("Hello world!");
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ldtest1("Hello world!");
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ldtest2("Hello world!");
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return 0;
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}
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