Fix CHECK_(C|CXX)_COMPILER_FLAG for XL and SunPro

These compilers warn and return 0 for unrecognized flags.  We fix the
compiler flag check macros by looking for a warning in the output.  We
also update the regex for GNU on older Macs.  See issue #9516.

Modules/CheckCCompilerFlag.cmake

@@ -19,9 +19,11 @@ MACRO (CHECK_C_COMPILER_FLAG _FLAG _RESULT)
    SET(CMAKE_REQUIRED_DEFINITIONS "${_FLAG}")
    CHECK_C_SOURCE_COMPILES("int main() { return 0;}" ${_RESULT}
      # Some compilers do not fail with a bad flag
-     FAIL_REGEX "unrecognized option"                       # GNU
+     FAIL_REGEX "unrecognized .*option"                     # GNU
      FAIL_REGEX "ignoring unknown option"                   # MSVC
      FAIL_REGEX "[Uu]nknown option"                         # HP
+     FAIL_REGEX "[Ww]arning: [Oo]ption"                     # SunPro
+     FAIL_REGEX "command option .* is not recognized"       # XL
      )
    SET (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
 ENDMACRO (CHECK_C_COMPILER_FLAG)

Modules/CheckCXXCompilerFlag.cmake

@@ -19,9 +19,11 @@ MACRO (CHECK_CXX_COMPILER_FLAG _FLAG _RESULT)
    SET(CMAKE_REQUIRED_DEFINITIONS "${_FLAG}")
    CHECK_CXX_SOURCE_COMPILES("int main() { return 0;}" ${_RESULT}
      # Some compilers do not fail with a bad flag
-     FAIL_REGEX "unrecognized option"                       # GNU
+     FAIL_REGEX "unrecognized .*option"                     # GNU
      FAIL_REGEX "ignoring unknown option"                   # MSVC
      FAIL_REGEX "[Uu]nknown option"                         # HP
+     FAIL_REGEX "[Ww]arning: [Oo]ption"                     # SunPro
+     FAIL_REGEX "command option .* is not recognized"       # XL
      )
    SET (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
 ENDMACRO (CHECK_CXX_COMPILER_FLAG)