From: Nick Hutchinson <nshutchinson@gmail.com>
Date: Sun, 2 May 2021 13:46:12 +0000 (+0100)
Subject: CMake: fix excessive build warnings when building with clang-cl
X-Git-Tag: v1.5.0^2~24^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2d34062836f73e2ac6e58a536482edebab387d4b;p=thirdparty%2Fzstd.git

CMake: fix excessive build warnings when building with clang-cl
---

diff --git a/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake b/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake
index 623897170..e23b9d603 100644
--- a/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake
+++ b/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake
@@ -26,7 +26,12 @@ macro(ADD_ZSTD_COMPILATION_FLAGS)
         EnableCompilerFlag("-std=c++11" false true)
         #Set c99 by default
         EnableCompilerFlag("-std=c99" true false)
-        EnableCompilerFlag("-Wall" true true)
+        if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND MSVC)
+            # clang-cl normally maps -Wall to -Weverything.
+            EnableCompilerFlag("/clang:-Wall" true true)
+        else ()
+            EnableCompilerFlag("-Wall" true true)
+        endif ()
         EnableCompilerFlag("-Wextra" true true)
         EnableCompilerFlag("-Wundef" true true)
         EnableCompilerFlag("-Wshadow" true true)