From c0afc3c44b7abdd70747eee42d10e6d7a920cf4f Mon Sep 17 00:00:00 2001
From: Nils Wentzell <nwentzell@flatironinstitute.org>
Date: Fri, 4 Aug 2023 14:52:46 -0400
Subject: [PATCH] [cmake] Protect against redefining santizier targets

---
 c++/app4triqs/CMakeLists.txt | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/c++/app4triqs/CMakeLists.txt b/c++/app4triqs/CMakeLists.txt
index 12ea5998..308acf2f 100644
--- a/c++/app4triqs/CMakeLists.txt
+++ b/c++/app4triqs/CMakeLists.txt
@@ -68,24 +68,32 @@ endif()
 
 option(ASAN OFF "Compile library and executables with LLVM Address Sanitizer")
 if(ASAN)
-  find_package(sanitizer REQUIRED COMPONENTS asan)
+  if(NOT TARGET ASAN)
+    find_package(sanitizer REQUIRED COMPONENTS asan)
+  endif()
   target_link_libraries(${PROJECT_NAME}_c PUBLIC $<BUILD_INTERFACE:asan>)
 endif()
 
 option(UBSAN OFF "Compile library and executables with LLVM Undefined Behavior Sanitizer")
 if(UBSAN)
-  find_package(sanitizer REQUIRED COMPONENTS ubsan)
+  if(NOT TARGET UBSAN)
+    find_package(sanitizer REQUIRED COMPONENTS ubsan)
+  endif()
   target_link_libraries(${PROJECT_NAME}_c PUBLIC $<BUILD_INTERFACE:ubsan>)
 endif()
 
 option(MSAN OFF "Compile library and executables with LLVM Memory Sanitizer")
 if(MSAN)
-  find_package(sanitizer REQUIRED COMPONENTS msan)
+  if(NOT TARGET MSAN)
+    find_package(sanitizer REQUIRED COMPONENTS msan)
+  endif()
   target_link_libraries(${PROJECT_NAME}_c PUBLIC $<BUILD_INTERFACE:msan>)
 endif()
 
 option(TSAN OFF "Compile library and executables with LLVM Thread Sanitizer")
 if(TSAN)
-  find_package(sanitizer REQUIRED COMPONENTS tsan)
+  if(NOT TARGET TSAN)
+    find_package(sanitizer REQUIRED COMPONENTS tsan)
+  endif()
   target_link_libraries(${PROJECT_NAME}_c PUBLIC $<BUILD_INTERFACE:tsan>)
 endif()