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35 # Helper routine to find flag (from a list) to compile a specific C source.
36 # VARIABLE This will be set when we have found a flag that works
37 # DESCRIPTION Text string describing what flag we are trying to find
38 # SOURCE Source code to test
39 # The compiler is chosen based on the extension of this file
40 # FLAGSVAR Variable (string) to which we should add the correct flag
41 # Args 5 through N Multiple strings with optimization flags to test
42 FUNCTION(GMX_FIND_CFLAG_FOR_SOURCE VARIABLE DESCRIPTION SOURCE CFLAGSVAR)
43 IF(NOT DEFINED ${VARIABLE})
44 # Insert a blank element last in the list (try without any flags too)
45 # This must come last, since some compilers (Intel) might try to emulate
46 # emulate AVX instructions with SSE4.1 otherwise.
47 foreach(_testflag ${ARGN} "")
48 message(STATUS "Try ${DESCRIPTION} = [${_testflag}]")
49 set(CMAKE_REQUIRED_FLAGS "${${CFLAGSVAR}} ${_testflag}")
50 # make a valid variable name from the flag string: replace all non-alphanumerical chars
51 string(REGEX REPLACE "[^a-zA-Z0-9]+" "_" COMPILE_VARIABLE "C_FLAG_${_testflag}")
52 check_c_source_compiles("${SOURCE}" ${COMPILE_VARIABLE})
53 if(${${COMPILE_VARIABLE}})
54 set(${VARIABLE}_FLAG "${_testflag}" CACHE INTERNAL "${DESCRIPTION}")
55 set(${VARIABLE} 1 CACHE INTERNAL "Result of test for ${DESCRIPTION}" FORCE)
58 set(${VARIABLE} 0 CACHE INTERNAL "Result of test for ${DESCRIPTION}" FORCE)
64 SET (${CFLAGSVAR} "${${CFLAGSVAR}} ${${VARIABLE}_FLAG}" PARENT_SCOPE)
66 ENDFUNCTION(GMX_FIND_CFLAG_FOR_SOURCE VARIABLE DESCRIPTION SOURCE CFLAGSVAR)
69 # Helper routine to find flag (from list) to compile a specific C++ source.
70 # VARIABLE This will be set when we have found a flag that works
71 # DESCRIPTION Text string describing what flag we are trying to find
72 # SOURCE Source code to test
73 # The compiler is chosen based on the extension of this file
74 # FLAGSVAR Variable (string) to which we should add the correct flag
75 # Args 5 through N Multiple strings with optimization flags to test
76 FUNCTION(GMX_FIND_CXXFLAG_FOR_SOURCE VARIABLE DESCRIPTION SOURCE CXXFLAGSVAR)
78 IF(NOT DEFINED ${VARIABLE})
79 # Insert a blank element last in the list (try without any flags too)
80 # This must come last, since some compilers (Intel) might try to
81 # emulate AVX instructions with SSE4.1 otherwise.
82 foreach(_testflag ${ARGN} "")
83 message(STATUS "Try ${DESCRIPTION} = [${_testflag}]")
84 set(CMAKE_REQUIRED_FLAGS "${${CXXFLAGSVAR}} ${_testflag}")
85 # make a valid variable name from the flag string: replace all non-alphanumerical chars
86 string(REGEX REPLACE "[^a-zA-Z0-9]+" "_" COMPILE_VARIABLE "CXX_FLAG_${_testflag}")
87 check_cxx_source_compiles("${SOURCE}" ${COMPILE_VARIABLE})
88 if(${${COMPILE_VARIABLE}})
89 set(${VARIABLE}_FLAG "${_testflag}" CACHE INTERNAL "${DESCRIPTION}")
90 set(${VARIABLE} 1 CACHE INTERNAL "Result of test for ${DESCRIPTION}" FORCE)
93 set(${VARIABLE} 0 CACHE INTERNAL "Result of test for ${DESCRIPTION}" FORCE)
99 SET (${CXXFLAGSVAR} "${${CXXFLAGSVAR}} ${${VARIABLE}_FLAG}" PARENT_SCOPE)
102 ENDFUNCTION(GMX_FIND_CXXFLAG_FOR_SOURCE VARIABLE DESCRIPTION SOURCE CXXFLAGSVAR)