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Features: Extract strings from test binary more reliably (#15736) 

Since commit v3.1.0-rc1~635^2~7 (project: Add infrastructure for
recording CXX compiler features, 2013-10-17) we compile a test source to
a binary and then extract "<LANG>_FEATURES:..." strings from the binary
with the file(STRINGS) command.  Add a newline at the beginning of the
string literal to be sure file(STRINGS) can extract the first entry as a
string independent of whatever else the compiler may put before the
storage it allocates for the literal within the binary.
This commit is contained in:
Brad King 2015-09-10 14:37:20 -04:00
parent 72797dec8f
commit 150e1b27c5
1 changed files with 1 additions and 1 deletions
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2
Modules/Internal/FeatureTesting.cmake
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@ -5,7 +5,7 @@ macro(record_compiler_features lang compile_flags feature_list)
string(TOLOWER ${lang} lang_lc) string(TOLOWER ${lang} lang_lc)
file(REMOVE "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.bin") file(REMOVE "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.bin")
file(WRITE "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.${lang_lc}" " file(WRITE "${CMAKE_BINARY_DIR}/CMakeFiles/feature_tests.${lang_lc}" "
const char features[] = {\"\"\n") const char features[] = {\"\\n\"\n")
get_property(known_features GLOBAL PROPERTY CMAKE_${lang}_KNOWN_FEATURES) get_property(known_features GLOBAL PROPERTY CMAKE_${lang}_KNOWN_FEATURES)