Ignore 32 bit build option when using MSVC (#638)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8ddacab..8631199 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,7 +16,11 @@
option(BENCHMARK_ENABLE_EXCEPTIONS "Enable the use of exceptions in the benchmark library." ON)
option(BENCHMARK_ENABLE_LTO "Enable link time optimisation of the benchmark library." OFF)
option(BENCHMARK_USE_LIBCXX "Build and test using libc++ as the standard library." OFF)
-option(BENCHMARK_BUILD_32_BITS "Build a 32 bit version of the library." OFF)
+if(NOT MSVC)
+ option(BENCHMARK_BUILD_32_BITS "Build a 32 bit version of the library." OFF)
+else()
+ set(BENCHMARK_BUILD_32_BITS OFF CACHE BOOL "Build a 32 bit version of the library - unsupported when using MSVC)" FORCE)
+endif()
option(BENCHMARK_ENABLE_INSTALL "Enable installation of benchmark. (Projects embedding benchmark may want to turn this OFF.)" ON)
# Allow unmet dependencies to be met using CMake's ExternalProject mechanics, which