From 7dee4e05f92052ccb289a7bf565a7e889a33f42b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Camilla=20L=C3=B6wy?= <elmindreda@elmindreda.org>
Date: Wed, 7 Oct 2020 22:51:58 +0200
Subject: [PATCH] Win32: Fix clang-cl interpreting -Wall as /Wall

Unlike -Wall, VS /Wall really means all warnings.

Closes #1780.

(cherry picked from commit ac627706ef93362caf08bd3bf249656efd9151e8)
---
 README.md          | 1 +
 src/CMakeLists.txt | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index a3af3efe..1a1f0316 100644
--- a/README.md
+++ b/README.md
@@ -224,6 +224,7 @@ skills.
  - Eloi Marín Gratacós
  - Stefan Gustavson
  - Jonathan Hale
+ - hdf89shfdfs
  - Sylvain Hellegouarch
  - Matthew Henry
  - heromyth
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 9519597d..402f8f6f 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -125,7 +125,12 @@ if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU" OR
     "${CMAKE_C_COMPILER_ID}" STREQUAL "Clang" OR
     "${CMAKE_C_COMPILER_ID}" STREQUAL "AppleClang")
 
-    target_compile_options(glfw PRIVATE "-Wall")
+    if ("${CMAKE_C_SIMULATE_ID}" STREQUAL "MSVC")
+        # Tell Clang-CL that this is a Clang flag
+        target_compile_options(glfw PRIVATE "/clang:-Wall")
+    else()
+        target_compile_options(glfw PRIVATE "-Wall")
+    endif()
 elseif (MSVC)
     target_compile_options(glfw PRIVATE "/W3")
 endif()