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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}} ${_testflag}")
50 # make valid variable names from the flag string: replace all non-alphanumerical chars
51 string(REGEX REPLACE "[^a-zA-Z0-9]+" "_" COMPILE_FLAG_VARIABLE "C_FLAG_${_testflag}")
52 string(REGEX REPLACE "[^a-zA-Z0-9]+" "_" COMPILE_SIMD_VARIABLE "C_SIMD_COMPILES_FLAG_${_testflag}")
54 # Check that the flag itself is fine, and that is does not generate warnings either
55 check_c_compiler_flag("${_testflag}" ${COMPILE_FLAG_VARIABLE})
57 if(${COMPILE_FLAG_VARIABLE})
58 # Check that we can compile SIMD source (this does not catch warnings)
59 check_c_source_compiles("${SOURCE}" ${COMPILE_SIMD_VARIABLE})
60 endif(${COMPILE_FLAG_VARIABLE})
62 if(${COMPILE_FLAG_VARIABLE} AND ${COMPILE_SIMD_VARIABLE})
63 set(${VARIABLE}_FLAG "${_testflag}" CACHE INTERNAL "${DESCRIPTION}")
64 set(${VARIABLE} 1 CACHE INTERNAL "Result of test for ${DESCRIPTION}" FORCE)
67 set(${VARIABLE} 0 CACHE INTERNAL "Result of test for ${DESCRIPTION}" FORCE)
73 SET (${CFLAGSVAR} "${${CFLAGSVAR}} ${${VARIABLE}_FLAG}" PARENT_SCOPE)
75 ENDFUNCTION(GMX_FIND_CFLAG_FOR_SOURCE VARIABLE DESCRIPTION SOURCE CFLAGSVAR)
78 # Helper routine to find flag (from list) to compile a specific C++ source.
79 # VARIABLE This will be set when we have found a flag that works
80 # DESCRIPTION Text string describing what flag we are trying to find
81 # SOURCE Source code to test
82 # The compiler is chosen based on the extension of this file
83 # FLAGSVAR Variable (string) to which we should add the correct flag
84 # Args 5 through N Multiple strings with optimization flags to test
85 FUNCTION(GMX_FIND_CXXFLAG_FOR_SOURCE VARIABLE DESCRIPTION SOURCE CXXFLAGSVAR)
87 IF(NOT DEFINED ${VARIABLE})
88 # Insert a blank element last in the list (try without any flags too)
89 # This must come last, since some compilers (Intel) might try to
90 # emulate AVX instructions with SSE4.1 otherwise.
91 foreach(_testflag ${ARGN} "")
92 message(STATUS "Try ${DESCRIPTION} = [${_testflag}]")
93 set(CMAKE_REQUIRED_FLAGS "${${CXXFLAGSVAR}} ${_testflag}")
94 # make valid variable names from the flag string: replace all non-alphanumerical chars
95 string(REGEX REPLACE "[^a-zA-Z0-9]+" "_" COMPILE_FLAG_VARIABLE "CXX_FLAG_${_testflag}")
96 string(REGEX REPLACE "[^a-zA-Z0-9]+" "_" COMPILE_SIMD_VARIABLE "CXX_SIMD_COMPILES_FLAG_${_testflag}")
98 # Check that the flag itself is fine, and that is does not generate warnings either
99 check_cxx_compiler_flag("${_testflag}" ${COMPILE_FLAG_VARIABLE})
101 if(${COMPILE_FLAG_VARIABLE})
102 # Check that we can compile SIMD source (this does not catch warnings)
103 check_cxx_source_compiles("${SOURCE}" ${COMPILE_SIMD_VARIABLE})
104 endif(${COMPILE_FLAG_VARIABLE})
106 if(${COMPILE_FLAG_VARIABLE} AND ${COMPILE_SIMD_VARIABLE})
107 set(${VARIABLE}_FLAG "${_testflag}" CACHE INTERNAL "${DESCRIPTION}")
108 set(${VARIABLE} 1 CACHE INTERNAL "Result of test for ${DESCRIPTION}" FORCE)
111 set(${VARIABLE} 0 CACHE INTERNAL "Result of test for ${DESCRIPTION}" FORCE)
117 SET (${CXXFLAGSVAR} "${${CXXFLAGSVAR}} ${${VARIABLE}_FLAG}" PARENT_SCOPE)
120 ENDFUNCTION(GMX_FIND_CXXFLAG_FOR_SOURCE VARIABLE DESCRIPTION SOURCE CXXFLAGSVAR)