CMakeLists.txt: Disable MSVC warning from third_party

`nlohmann/json` raises a `size_t` to `int` MSVC warning that will fail the build if `CPPDAP_WARNINGS_AS_ERRORS` is enabled. Given that this is not our code, the best we can do is to make an exception for this warning.

CMakeLists.txt: Disable MSVC warning from third_party
dc3b3eae · Ben Clayton · 010e3e3c · dc3b3eae
Commit dc3b3eae authored Nov 26, 2019 by Ben Clayton
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CMakeLists.txt CMakeLists.txt +6 -1

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--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -98,7 +98,12 @@ function(cppdap_set_target_options target)

    # Disable specific, pedantic warnings
    if(MSVC)
-        target_compile_options(${target} PRIVATE "-D_CRT_SECURE_NO_WARNINGS")
+        target_compile_options(${target} PRIVATE
+            "-D_CRT_SECURE_NO_WARNINGS"
+
+            # Warnings from nlohmann/json headers.
+            "/wd4267" # 'argument': conversion from 'size_t' to 'int', possible loss of data
+        )
    endif()

    # Treat all warnings as errors