Check argument for CMake REGEX FCMangle.h. (HDFGroup#4029)

config/cmake/HDFUseFortran.cmake

@@ -31,18 +31,24 @@ endif ()
 # Detect name mangling convention used between Fortran and C
 #-----------------------------------------------------------------------------
 include (FortranCInterface)
+
+#-----------------------------------------------------------------------------
+# Verify that the Fortran and C/C++ compilers work together
+#-----------------------------------------------------------------------------
+FortranCInterface_VERIFY()
+
 FortranCInterface_HEADER (
     ${CMAKE_BINARY_DIR}/FCMangle.h
     MACRO_NAMESPACE "H5_FC_"
     SYMBOL_NAMESPACE "H5_FC_"
 )
 
 file (STRINGS ${CMAKE_BINARY_DIR}/FCMangle.h CONTENTS REGEX "H5_FC_GLOBAL\\(.*,.*\\) +(.*)")
-string (REGEX MATCH "H5_FC_GLOBAL\\(.*,.*\\) +(.*)" RESULT ${CONTENTS})
+string (REGEX MATCH "H5_FC_GLOBAL\\(.*,.*\\) +(.*)" RESULT  ${CONTENTS})
 set (H5_FC_FUNC "H5_FC_FUNC(name,NAME) ${CMAKE_MATCH_1}")
 
 file (STRINGS ${CMAKE_BINARY_DIR}/FCMangle.h CONTENTS REGEX "H5_FC_GLOBAL_\\(.*,.*\\) +(.*)")
-string (REGEX MATCH "H5_FC_GLOBAL_\\(.*,.*\\) +(.*)" RESULT ${CONTENTS})
+string (REGEX MATCH "H5_FC_GLOBAL_\\(.*,.*\\) +(.*)" RESULT  ${CONTENTS})
 set (H5_FC_FUNC_ "H5_FC_FUNC_(name,NAME) ${CMAKE_MATCH_1}")
 
 #test code source