blog

commit: 8b0e0510c2659e999ba60e7d53196c7410d80303
parent 006aaf8d27dfd560cd1d6e6cdf9be8d2be5ef4fa
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Wed, 10 Mar 2021 14:47:17 +0100

notes/pure-wayland: Add buildsystem snippets

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notes/pure-wayland.shtml
22
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1 file changed, 22 insertions(+), 0 deletions(-)
diff --git a/notes/pure-wayland.shtml b/notes/pure-wayland.shtml
@@ -22,6 +22,28 @@
 				</dl>
 			</p>
 
+			<h2>Buildsystems</h2>
+			<p>I've yet to see one work correctly out of the box for this. The snippets in this section Abandons all copyrights if it could even begin to be copyrightable, sadly Public Domain doesn't exists in France so, they are distributed under any OSI/FSF-approuved license including CC-0, WTFPL, Unlicense and BSD-0.</p>
+			<h3>CMake</h3>
+			<ol>
+				<li>Replace <code>find_package(OpenGL REQUIRED)</code> to something like <code>find_package(OpenGL COMPONENTS OpenGL REQUIRED)</code>. This allows to not error out when libGL.so isn't found but libOpenGL.so is.</li>
+				<li>Replace <code>OPENGL_gl_LIBRARY</code> to <code>OPENGL_opengl_LIBRARY</code>. This will allow to use libOpenGL.so over libGL.so when possible.</li>
+			</ol>
+			<h3>Auto*hell</h3>
+			<p>Use something like the following:</p>
+<pre><code>AC_CHECK_HEADER(
+	[GL/gl.h],
+	AC_SEARCH_LIBS(glBegin, [opengl32 GL GL2 OpenGL], [test $ac_cv_search_glBegin = "none required" || GL_LIBS="$ac_cv_search_glBegin $GL_LIBS"], [AC_MSG_ERROR(*** OpenGL library not found on system!)]),
+	[AC_MSG_ERROR(*** OpenGL headers not found on system!)]
+)</code></pre>
+			<h3>meson</h3>
+			<p>Nice fail of an otherwise nice mainly declarative buildsystem there…</p>
+<pre><code>gl_dep = dependency('gl', required: false)
+if not gl_dep.found()
+  # libglvnd fallback for libX11-less wayland systems
+  gl_dep = dependency('opengl')
+endif</code></pre>
+
 			<h2>Librairies</h2>
 			<ul>
 				<li><a href="https://www.gtk.org/">GTK</a> 3 and later: Yes, Just Works</li>