FindOpenGL: Add policy CMP0072 to prefer GLVND for legacy GL

Fixes: #17449

11 files changed, 57 insertions, 0 deletions

diff --git a/Tests/RunCMake/CMakeLists.txt b/Tests/RunCMake/CMakeLists.txt
index 5d584af..07d9f08 100644
--- a/Tests/RunCMake/CMakeLists.txt
+++ b/Tests/RunCMake/CMakeLists.txt
@@ -144,6 +144,7 @@ add_RunCMake_test(ExternalData)
 add_RunCMake_test(FeatureSummary)
 add_RunCMake_test(FPHSA)
 add_RunCMake_test(FindBoost)
+add_RunCMake_test(FindOpenGL)
 if(NOT CMAKE_C_COMPILER_ID MATCHES "Watcom")
   add_RunCMake_test(GenerateExportHeader)
 endif()
diff --git a/Tests/RunCMake/FindOpenGL/CMP0072-NEW-stdout.txt b/Tests/RunCMake/FindOpenGL/CMP0072-NEW-stdout.txt
new file mode 100644
index 0000000..f5ee220
--- /dev/null
+++ b/Tests/RunCMake/FindOpenGL/CMP0072-NEW-stdout.txt
@@ -0,0 +1,3 @@
+-- OpenGL_GL_PREFERENCE='GLVND'
+-- OPENGL_gl_LIBRARY=''
+-- OPENGL_LIBRARIES='OpenGL;GLX;GLU'
diff --git a/Tests/RunCMake/FindOpenGL/CMP0072-NEW.cmake b/Tests/RunCMake/FindOpenGL/CMP0072-NEW.cmake
new file mode 100644
index 0000000..6cbbeec
--- /dev/null
+++ b/Tests/RunCMake/FindOpenGL/CMP0072-NEW.cmake
@@ -0,0 +1,2 @@
+cmake_policy(SET CMP0072 NEW)
+include(CMP0072-common.cmake)
diff --git a/Tests/RunCMake/FindOpenGL/CMP0072-OLD-stdout.txt b/Tests/RunCMake/FindOpenGL/CMP0072-OLD-stdout.txt
new file mode 100644
index 0000000..22df1b1
--- /dev/null
+++ b/Tests/RunCMake/FindOpenGL/CMP0072-OLD-stdout.txt
@@ -0,0 +1,3 @@
+-- OpenGL_GL_PREFERENCE='LEGACY'
+-- OPENGL_gl_LIBRARY='GL'
+-- OPENGL_LIBRARIES='GL;GLU'
diff --git a/Tests/RunCMake/FindOpenGL/CMP0072-OLD.cmake b/Tests/RunCMake/FindOpenGL/CMP0072-OLD.cmake
new file mode 100644
index 0000000..6d57004
--- /dev/null
+++ b/Tests/RunCMake/FindOpenGL/CMP0072-OLD.cmake
@@ -0,0 +1,2 @@
+cmake_policy(SET CMP0072 OLD)
+include(CMP0072-common.cmake)
diff --git a/Tests/RunCMake/FindOpenGL/CMP0072-WARN-stderr.txt b/Tests/RunCMake/FindOpenGL/CMP0072-WARN-stderr.txt
new file mode 100644
index 0000000..f26f217
--- /dev/null
+++ b/Tests/RunCMake/FindOpenGL/CMP0072-WARN-stderr.txt
@@ -0,0 +1,21 @@
+^CMake Warning \(dev\) at .*/Modules/FindOpenGL.cmake:[0-9]+ \(message\):
+  Policy CMP0072 is not set: FindOpenGL prefers GLVND by default when
+  available.  Run "cmake --help-policy CMP0072" for policy details.  Use the
+  cmake_policy command to set the policy and suppress this warning.
+
+  FindOpenGL found both a legacy GL library:
+
+    OPENGL_gl_LIBRARY: GL
+
+  and GLVND libraries for OpenGL and GLX:
+
+    OPENGL_opengl_LIBRARY: OpenGL
+    OPENGL_glx_LIBRARY: GLX
+
+  OpenGL_GL_PREFERENCE has not been set to "GLVND" or "LEGACY", so for
+  compatibility with CMake 3.10 and below the legacy GL library will be used.
+Call Stack \(most recent call first\):
+  CMP0072-common.cmake:[0-9]+ \(find_package\)
+  CMP0072-WARN.cmake:[0-9]+ \(include\)
+  CMakeLists.txt:[0-9]+ \(include\)
+This warning is for project developers.  Use -Wno-dev to suppress it.$
diff --git a/Tests/RunCMake/FindOpenGL/CMP0072-WARN-stdout.txt b/Tests/RunCMake/FindOpenGL/CMP0072-WARN-stdout.txt
new file mode 100644
index 0000000..22df1b1
--- /dev/null
+++ b/Tests/RunCMake/FindOpenGL/CMP0072-WARN-stdout.txt
@@ -0,0 +1,3 @@
+-- OpenGL_GL_PREFERENCE='LEGACY'
+-- OPENGL_gl_LIBRARY='GL'
+-- OPENGL_LIBRARIES='GL;GLU'
diff --git a/Tests/RunCMake/FindOpenGL/CMP0072-WARN.cmake b/Tests/RunCMake/FindOpenGL/CMP0072-WARN.cmake
new file mode 100644
index 0000000..459c458
--- /dev/null
+++ b/Tests/RunCMake/FindOpenGL/CMP0072-WARN.cmake
@@ -0,0 +1 @@
+include(CMP0072-common.cmake)
diff --git a/Tests/RunCMake/FindOpenGL/CMP0072-common.cmake b/Tests/RunCMake/FindOpenGL/CMP0072-common.cmake
new file mode 100644
index 0000000..3fe8030
--- /dev/null
+++ b/Tests/RunCMake/FindOpenGL/CMP0072-common.cmake
@@ -0,0 +1,13 @@
+set(CYGWIN 0)
+set(WIN32 0)
+set(APPLE 0)
+set(OPENGL_INCLUDE_DIR GL/include)
+set(OPENGL_GLX_INCLUDE_DIR GLX/include)
+set(OPENGL_gl_LIBRARY GL)
+set(OPENGL_opengl_LIBRARY OpenGL)
+set(OPENGL_glx_LIBRARY GLX)
+set(OPENGL_glu_LIBRARY GLU)
+find_package(OpenGL)
+message(STATUS "OpenGL_GL_PREFERENCE='${OpenGL_GL_PREFERENCE}'")
+message(STATUS "OPENGL_gl_LIBRARY='${OPENGL_gl_LIBRARY}'")
+message(STATUS "OPENGL_LIBRARIES='${OPENGL_LIBRARIES}'")
diff --git a/Tests/RunCMake/FindOpenGL/CMakeLists.txt b/Tests/RunCMake/FindOpenGL/CMakeLists.txt
new file mode 100644
index 0000000..bf2ef15
--- /dev/null
+++ b/Tests/RunCMake/FindOpenGL/CMakeLists.txt
@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 3.10)
+project(${RunCMake_TEST} NONE)
+include(${RunCMake_TEST}.cmake)
diff --git a/Tests/RunCMake/FindOpenGL/RunCMakeTest.cmake b/Tests/RunCMake/FindOpenGL/RunCMakeTest.cmake
new file mode 100644
index 0000000..fcc130f
--- /dev/null
+++ b/Tests/RunCMake/FindOpenGL/RunCMakeTest.cmake
@@ -0,0 +1,5 @@
+include(RunCMake)
+
+run_cmake(CMP0072-WARN)
+run_cmake(CMP0072-OLD)
+run_cmake(CMP0072-NEW)