Mesa (main): clc: Only initialize LLVM once

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Module: Mesa
Branch: main
Commit: 6e3b9b1b1d8f5b88ac5f0a660c9c08261490206e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=6e3b9b1b1d8f5b88ac5f0a660c9c08261490206e

Author: Jason Ekstrand <jason.ekstrand at collabora.com>
Date:   Fri Apr  8 16:20:43 2022 -0500

clc: Only initialize LLVM once

Reviewed-by: Jesse Natalie <jenatali at microsoft.com>
Reviewed-by: Icecream95 <ixn at disroot.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15937>

---

 src/compiler/clc/clc_helpers.cpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/compiler/clc/clc_helpers.cpp b/src/compiler/clc/clc_helpers.cpp
index 73d34ddab72..1a7f0c19f6a 100644
--- a/src/compiler/clc/clc_helpers.cpp
+++ b/src/compiler/clc/clc_helpers.cpp
@@ -24,6 +24,7 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 
 #include <sstream>
+#include <mutex>
 
 #include <llvm/ADT/ArrayRef.h>
 #include <llvm/IR/DiagnosticPrinter.h>
@@ -1148,7 +1149,7 @@ clc_free_spirv_binary(struct clc_binary *spvbin)
 }
 
 void
-clc_initialize_llvm(void)
+initialize_llvm_once(void)
 {
    LLVMInitializeAllTargets();
    LLVMInitializeAllTargetInfos();
@@ -1156,3 +1157,12 @@ clc_initialize_llvm(void)
    LLVMInitializeAllAsmParsers();
    LLVMInitializeAllAsmPrinters();
 }
+
+std::once_flag initialize_llvm_once_flag;
+
+void
+clc_initialize_llvm(void)
+{
+   std::call_once(initialize_llvm_once_flag,
+                  []() { initialize_llvm_once(); });
+}