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Kaiyi Li
2ea749c7ea
CMAKE_CXX_FLAGS is a space-separated string rather than a semicolon-separated
list. Passing ${CMAKE_CXX_FLAGS} directly to execute_process(COMMAND ...)
passes the entire multi-flag string as a single argv argument to the compiler,
causing option parsing to fail when multiple flags are present (such as
flags configured via the CXXFLAGS environment variable).
Use separate_arguments() to convert CMAKE_CXX_FLAGS into a list so each flag
is passed as an individual argument.