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C++ feature checks: Filter out warnings caused by local configuration

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In some environments the linker produces warnings like

    warning: directory not found for option
    warning: object file compiled with -mlong-branch ...

These do not affect the availability of C++ features we're checking,
so filter them out.

Fixes: #17850, #17947
This commit is contained in:
Brad King 2018-04-27 13:12:01 -04:00
parent fbe6cd1596
commit 2254b72061
1 changed files with 3 additions and 0 deletions
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3
Source/Checks/cm_cxx_features.cmake
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@ -19,6 +19,9 @@ function(cm_check_cxx_feature name)
string(REGEX REPLACE " +0 Warning\\(s\\)" "" check_output "${check_output}")
# Filter out warnings caused by user flags.
string(REGEX REPLACE "[^\n]*warning:[^\n]*-Winvalid-command-line-argument[^\n]*" "" check_output "${check_output}")
# Filter out warnings caused by local configuration.
string(REGEX REPLACE "[^\n]*warning:[^\n]*directory not found for option[^\n]*" "" check_output "${check_output}")
string(REGEX REPLACE "[^\n]*warning:[^\n]*object file compiled with -mlong-branch which is no longer needed[^\n]*" "" check_output "${check_output}")
# If using the feature causes warnings, treat it as broken/unavailable.
if(check_output MATCHES "[Ww]arning")
set(CMake_HAVE_CXX_${FEATURE} OFF CACHE INTERNAL "TRY_COMPILE" FORCE)