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<a href="https://gitlab.com/rwmjones">Richard W.M. Jones</a>
<a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1544#note_853664582">commented</a>:
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<p dir="auto">There's actually a trick using <code>typeof</code> which avoids redefining each variable type (and it's more type safe). However I'm not sure if it requires a GCC extension or not. See example:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" v-pre="true" style="border-radius: 2px; margin: 0 0 8px; padding: 8px 12px; border: 1px solid #dbdbdb;"><code><span id="LC1" class="line" lang="plaintext">#include <stdio.h> </span>
<span id="LC2" class="line" lang="plaintext">#include <stdlib.h> </span>
<span id="LC3" class="line" lang="plaintext">#include <assert.h> </span>
<span id="LC4" class="line" lang="plaintext">#include <tss2/tss2_esys.h> </span>
<span id="LC5" class="line" lang="plaintext">#include <dlfcn.h> </span>
<span id="LC6" class="line" lang="plaintext"> </span>
<span id="LC7" class="line" lang="plaintext">typeof(Esys_Initialize) (*my_Esys_Initialize); </span>
<span id="LC8" class="line" lang="plaintext">typeof(Esys_Finalize) (*my_Esys_Finalize); </span>
<span id="LC9" class="line" lang="plaintext"> </span>
<span id="LC10" class="line" lang="plaintext">int </span>
<span id="LC11" class="line" lang="plaintext">main () </span>
<span id="LC12" class="line" lang="plaintext">{ </span>
<span id="LC13" class="line" lang="plaintext"> void *dl = dlopen ("libtss2-esys.so.0", RTLD_NOW); </span>
<span id="LC14" class="line" lang="plaintext"> assert (dl); </span>
<span id="LC15" class="line" lang="plaintext"> </span>
<span id="LC16" class="line" lang="plaintext"> my_Esys_Initialize = dlsym (dl, "Esys_Initialize"); </span>
<span id="LC17" class="line" lang="plaintext"> assert (my_Esys_Initialize); </span>
<span id="LC18" class="line" lang="plaintext"> my_Esys_Finalize = dlsym (dl, "Esys_Finalize"); </span>
<span id="LC19" class="line" lang="plaintext"> assert (my_Esys_Finalize); </span>
<span id="LC20" class="line" lang="plaintext"> </span>
<span id="LC21" class="line" lang="plaintext"> ESYS_CONTEXT *ctx; </span>
<span id="LC22" class="line" lang="plaintext"> if (my_Esys_Initialize (&ctx, NULL, NULL)) { </span>
<span id="LC23" class="line" lang="plaintext"> fprintf (stderr, "Esys_Initialize failed\n"); </span>
<span id="LC24" class="line" lang="plaintext"> exit (1); </span>
<span id="LC25" class="line" lang="plaintext"> } </span>
<span id="LC26" class="line" lang="plaintext"> </span>
<span id="LC27" class="line" lang="plaintext"> fprintf (stderr, "ctx = %p\n", ctx); </span>
<span id="LC28" class="line" lang="plaintext"> </span>
<span id="LC29" class="line" lang="plaintext"> my_Esys_Finalize (&ctx); </span>
<span id="LC30" class="line" lang="plaintext"> exit (0); </span>
<span id="LC31" class="line" lang="plaintext">} </span></code></pre>
<copy-code></copy-code>
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