Cache RUN_${FEATURE} variable in CXXFeatureCheck.cmake (#886)

When cross-compiling, this variable was not set on the second run of CMake, resulting in the next check failing even though it shouldn't be run in the first place. Fix this by caching the variable.

Cache RUN_${FEATURE} variable in CXXFeatureCheck.cmake (#886)
f4f5dba4 · Kyle Edwards · Dominic Hamon · b8bce0c7 · f4f5dba4
Commit f4f5dba4 authored Oct 04, 2019 by Kyle Edwards Committed by Dominic Hamon Oct 04, 2019
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CXXFeatureCheck.cmake cmake/CXXFeatureCheck.cmake +2 -2

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--- a/cmake/CXXFeatureCheck.cmake
+++ b/cmake/CXXFeatureCheck.cmake
@@ -37,9 +37,9 @@ function(cxx_feature_check FILE)
      if(COMPILE_${FEATURE})
        message(WARNING
              "If you see build failures due to cross compilation, try setting HAVE_${VAR} to 0")
-        set(RUN_${FEATURE} 0)
+        set(RUN_${FEATURE} 0 CACHE INTERNAL "")
      else()
-        set(RUN_${FEATURE} 1)
+        set(RUN_${FEATURE} 1 CACHE INTERNAL "")
      endif()
    else()
      message(STATUS "Performing Test ${FEATURE}")