From e8e628de57789fea4c7266e71f7443fa70a75233 Mon Sep 17 00:00:00 2001
From: Daniel Bertalan <dani@danielbertalan.dev>
Date: Tue, 6 Jul 2021 06:27:27 +0200
Subject: Everywhere: Add Clang pragmas

We use these to prevent UB from being optimized away in `/bin/crash` and
to make the compiler not warn about the many implicit floating point
type promotions in LibM.
---
 Userland/Libraries/LibM/math.cpp | 9 +++++++++
 Userland/Utilities/crash.cpp     | 6 +++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/Userland/Libraries/LibM/math.cpp b/Userland/Libraries/LibM/math.cpp
index 6599f9d9ed..121aa10d06 100644
--- a/Userland/Libraries/LibM/math.cpp
+++ b/Userland/Libraries/LibM/math.cpp
@@ -14,6 +14,11 @@
 #include <stdint.h>
 #include <stdlib.h>
 
+#ifdef __clang__
+#    pragma clang diagnostic push
+#    pragma clang diagnostic ignored "-Wdouble-promotion"
+#endif
+
 template<size_t>
 constexpr double e_to_power();
 template<>
@@ -1461,3 +1466,7 @@ float nearbyintf(float value) NOEXCEPT
     return internal_to_integer(value, RoundingMode { fegetround() });
 }
 }
+
+#ifdef __clang__
+#    pragma clang diagnostic pop
+#endif
diff --git a/Userland/Utilities/crash.cpp b/Userland/Utilities/crash.cpp
index e6c9b13d9d..7781517f2d 100644
--- a/Userland/Utilities/crash.cpp
+++ b/Userland/Utilities/crash.cpp
@@ -21,7 +21,11 @@
 
 using Test::Crash;
 
-#pragma GCC optimize("O0")
+#ifdef __clang__
+#    pragma clang optimize off
+#else
+#    pragma GCC optimize("O0")
+#endif
 
 int main(int argc, char** argv)
 {
-- 
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