From 3b0bf71a72789eb2b79310b4f67602115e347f56 Mon Sep 17 00:00:00 2001
From: Simon Hausmann <simon.hausmann@qt.io>
Date: Tue, 24 Sep 2019 09:47:02 +0200
Subject: Fix FindEGL when using Emscripten

When using the Emscripten toolchain, there is no library linkage
necessary (there is no library) and the system include search paths
provide EGL headers.

Reviewed By: vkrause

Differential Revision: https://phabricator.kde.org/D24182
---
 find-modules/FindEGL.cmake | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/find-modules/FindEGL.cmake b/find-modules/FindEGL.cmake
index de271a11..48e51728 100644
--- a/find-modules/FindEGL.cmake
+++ b/find-modules/FindEGL.cmake
@@ -129,25 +129,33 @@ int main(int argc, char *argv[]) {
 
 cmake_pop_check_state()
 
+set(required_vars EGL_INCLUDE_DIR HAVE_EGL)
+if(NOT EMSCRIPTEN)
+    list(APPEND required_vars EGL_LIBRARY)
+endif()
+
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(EGL
     FOUND_VAR
         EGL_FOUND
     REQUIRED_VARS
-        EGL_LIBRARY
-        EGL_INCLUDE_DIR
-        HAVE_EGL
+        ${required_vars}
     VERSION_VAR
         EGL_VERSION
 )
 
 if(EGL_FOUND AND NOT TARGET EGL::EGL)
-    add_library(EGL::EGL UNKNOWN IMPORTED)
-    set_target_properties(EGL::EGL PROPERTIES
-        IMPORTED_LOCATION "${EGL_LIBRARY}"
-        INTERFACE_COMPILE_OPTIONS "${EGL_DEFINITIONS}"
-        INTERFACE_INCLUDE_DIRECTORIES "${EGL_INCLUDE_DIR}"
-    )
+    if (EMSCRIPTEN)
+        add_library(EGL::EGL INTERFACE IMPORTED)
+        # Nothing further to be done, system include paths have headers and linkage is implicit.
+    else()
+        add_library(EGL::EGL UNKNOWN IMPORTED)
+        set_target_properties(EGL::EGL PROPERTIES
+            IMPORTED_LOCATION "${EGL_LIBRARY}"
+            INTERFACE_COMPILE_OPTIONS "${EGL_DEFINITIONS}"
+            INTERFACE_INCLUDE_DIRECTORIES "${EGL_INCLUDE_DIR}"
+        )
+    endif()
 endif()
 
 mark_as_advanced(EGL_LIBRARY EGL_INCLUDE_DIR HAVE_EGL)
-- 
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