From d32156fd3773330eca99e9cba5e18db57aaa1a53 Mon Sep 17 00:00:00 2001
From: Stephan Hartmann <stha09@googlemail.com>
Date: Sat, 19 Feb 2022 10:14:24 +0000
Subject: [PATCH] GCC: make GLImplementationParts constructors constexpr

Fix build error in GCC, as the constexpr operator== requires its
invocations to be also constexpr.
---
 ui/gl/gl_implementation.cc | 23 -----------------------
 ui/gl/gl_implementation.h  | 25 +++++++++++++++++++++++--
 2 files changed, 23 insertions(+), 25 deletions(-)

diff --git a/ui/gl/gl_implementation.cc b/ui/gl/gl_implementation.cc
index e4e5456..3e4a47c 100644
--- a/ui/gl/gl_implementation.cc
+++ b/ui/gl/gl_implementation.cc
@@ -26,29 +26,6 @@
 
 namespace gl {
 
-ANGLEImplementation MakeANGLEImplementation(
-    const GLImplementation gl_impl,
-    const ANGLEImplementation angle_impl) {
-  if (gl_impl == kGLImplementationEGLANGLE) {
-    if (angle_impl == ANGLEImplementation::kNone) {
-      return ANGLEImplementation::kDefault;
-    } else {
-      return angle_impl;
-    }
-  } else {
-    return ANGLEImplementation::kNone;
-  }
-}
-
-GLImplementationParts::GLImplementationParts(
-    const ANGLEImplementation angle_impl)
-    : gl(kGLImplementationEGLANGLE),
-      angle(MakeANGLEImplementation(kGLImplementationEGLANGLE, angle_impl)) {}
-
-GLImplementationParts::GLImplementationParts(const GLImplementation gl_impl)
-    : gl(gl_impl),
-      angle(MakeANGLEImplementation(gl_impl, ANGLEImplementation::kDefault)) {}
-
 bool GLImplementationParts::IsValid() const {
   if (angle == ANGLEImplementation::kNone) {
     return (gl != kGLImplementationEGLANGLE);
diff --git a/ui/gl/gl_implementation.h b/ui/gl/gl_implementation.h
index 376ed58..a2513ea 100644
--- a/ui/gl/gl_implementation.h
+++ b/ui/gl/gl_implementation.h
@@ -59,8 +59,14 @@ enum class ANGLEImplementation {
 };
 
 struct GL_EXPORT GLImplementationParts {
-  explicit GLImplementationParts(const ANGLEImplementation angle_impl);
-  explicit GLImplementationParts(const GLImplementation gl_impl);
+  constexpr explicit GLImplementationParts(const ANGLEImplementation angle_impl)
+      : gl(kGLImplementationEGLANGLE),
+        angle(MakeANGLEImplementation(kGLImplementationEGLANGLE, angle_impl)) {}
+
+  constexpr explicit GLImplementationParts(const GLImplementation gl_impl)
+      : gl(gl_impl),
+        angle(MakeANGLEImplementation(gl_impl, ANGLEImplementation::kDefault)) {
+  }
 
   GLImplementation gl = kGLImplementationNone;
   ANGLEImplementation angle = ANGLEImplementation::kNone;
@@ -80,6 +86,21 @@ struct GL_EXPORT GLImplementationParts {
   bool IsValid() const;
   bool IsAllowed(const std::vector<GLImplementationParts>& allowed_impls) const;
   std::string ToString() const;
+
+ private:
+  constexpr ANGLEImplementation MakeANGLEImplementation(
+      const GLImplementation gl_impl,
+      const ANGLEImplementation angle_impl) {
+    if (gl_impl == kGLImplementationEGLANGLE) {
+      if (angle_impl == ANGLEImplementation::kNone) {
+        return ANGLEImplementation::kDefault;
+      } else {
+        return angle_impl;
+      }
+    } else {
+      return ANGLEImplementation::kNone;
+    }
+  }
 };
 
 struct GL_EXPORT GLWindowSystemBindingInfo {
-- 
2.34.1