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Always expose the use_libc++ option. It's only useful for Clang but cmake.class
tries to find when we've used CMake options which are unused/unknown and this
triggers it for GCC builds if we set -Duse_libc++=OFF.
So, always expose the option so we can turn it off without a warning.
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,7 @@ option(build_parse "Parses source code and dumps the dependencies between th
option(build_search "Build external search tools (doxysearch and doxyindexer)" OFF)
option(build_doc "Build user manual (HTML and PDF)" OFF)
option(build_doc_chm "Build user manual (CHM)" OFF)
-if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+if(TRUE)
option(use_libc++ "Use libc++ as C++ standard library." ON)
endif()
option(use_libclang "Add support for libclang parsing." OFF)
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