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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
43 # If a compile flag is found, but the project in check_c_source_compiles
44 # fails to build, sets SUGGEST_BINUTILS_UPDATE in parent scope to suggest
45 # that the calling code tell the user about this issue if needed.
46 FUNCTION(GMX_FIND_CFLAG_FOR_SOURCE VARIABLE DESCRIPTION SOURCE CFLAGSVAR)
47 IF(NOT DEFINED ${VARIABLE})
48 # Insert a blank element last in the list (try without any flags too)
49 # This must come last, since some compilers (Intel) might try to emulate
50 # emulate AVX instructions with SSE4.1 otherwise.
51 foreach(_testflag ${ARGN} "")
52 message(STATUS "Try ${DESCRIPTION} = [${_testflag}]")
53 set(CMAKE_REQUIRED_FLAGS "${${CFLAGSVAR}} ${_testflag}")
54 # make valid variable names from the flag string: replace all non-alphanumerical chars
55 string(REGEX REPLACE "[^a-zA-Z0-9]+" "_" COMPILE_FLAG_VARIABLE "C_FLAG_${_testflag}")
56 string(REGEX REPLACE "[^a-zA-Z0-9]+" "_" COMPILE_SIMD_VARIABLE "C_SIMD_COMPILES_FLAG_${_testflag}")
58 # Check that the flag itself is fine, and that is does not generate warnings either
59 check_c_compiler_flag("${_testflag}" ${COMPILE_FLAG_VARIABLE})
61 if(${COMPILE_FLAG_VARIABLE})
62 # Check that we can compile SIMD source (this does not catch compiler warnings)
63 check_c_source_compiles("${SOURCE}" ${COMPILE_SIMD_VARIABLE})
64 if(NOT ${COMPILE_SIMD_VARIABLE})
65 message(STATUS "Compiler flag was valid, but executable did not build - perhaps update the binutils package")
66 set(SUGGEST_BINUTILS_UPDATE 1 PARENT_SCOPE)
70 if(${COMPILE_FLAG_VARIABLE} AND ${COMPILE_SIMD_VARIABLE})
71 set(${VARIABLE}_FLAG "${_testflag}" CACHE INTERNAL "${DESCRIPTION}")
72 set(${VARIABLE} 1 CACHE INTERNAL "Result of test for ${DESCRIPTION}" FORCE)
75 set(${VARIABLE} 0 CACHE INTERNAL "Result of test for ${DESCRIPTION}" FORCE)
81 SET (${CFLAGSVAR} "${${CFLAGSVAR}} ${${VARIABLE}_FLAG}" PARENT_SCOPE)
83 ENDFUNCTION(GMX_FIND_CFLAG_FOR_SOURCE VARIABLE DESCRIPTION SOURCE CFLAGSVAR)
86 # Helper routine to find flag (from list) to compile a specific C++ source.
87 # VARIABLE This will be set when we have found a flag that works
88 # DESCRIPTION Text string describing what flag we are trying to find
89 # SOURCE Source code to test
90 # The compiler is chosen based on the extension of this file
91 # FLAGSVAR Variable (string) to which we should add the correct flag
92 # Args 5 through N Multiple strings with optimization flags to test
94 # If a compile flag is found, but the project in check_cxx_source_compiles
95 # fails to build, sets SUGGEST_BINUTILS_UPDATE in parent scope to suggest
96 # that the calling code tell the user about this issue if needed.
97 FUNCTION(GMX_FIND_CXXFLAG_FOR_SOURCE VARIABLE DESCRIPTION SOURCE CXXFLAGSVAR)
99 IF(NOT DEFINED ${VARIABLE})
100 # Insert a blank element last in the list (try without any flags too)
101 # This must come last, since some compilers (Intel) might try to
102 # emulate AVX instructions with SSE4.1 otherwise.
103 foreach(_testflag ${ARGN} "")
104 message(STATUS "Try ${DESCRIPTION} = [${_testflag}]")
105 set(CMAKE_REQUIRED_FLAGS "${${CXXFLAGSVAR}} ${_testflag}")
106 # make valid variable names from the flag string: replace all non-alphanumerical chars
107 string(REGEX REPLACE "[^a-zA-Z0-9]+" "_" COMPILE_FLAG_VARIABLE "CXX_FLAG_${_testflag}")
108 string(REGEX REPLACE "[^a-zA-Z0-9]+" "_" COMPILE_SIMD_VARIABLE "CXX_SIMD_COMPILES_FLAG_${_testflag}")
110 # Check that the flag itself is fine, and that is does not generate warnings either
111 check_cxx_compiler_flag("${_testflag}" ${COMPILE_FLAG_VARIABLE})
113 if(${COMPILE_FLAG_VARIABLE})
114 # Check that we can compile SIMD source (this does not catch compiler warnings)
115 check_cxx_source_compiles("${SOURCE}" ${COMPILE_SIMD_VARIABLE})
116 if(NOT ${COMPILE_SIMD_VARIABLE})
117 message(STATUS "Compiler flag was valid, but executable did not build - perhaps update the binutils package")
118 set(SUGGEST_BINUTILS_UPDATE 1 PARENT_SCOPE)
122 if(${COMPILE_FLAG_VARIABLE} AND ${COMPILE_SIMD_VARIABLE})
123 set(${VARIABLE}_FLAG "${_testflag}" CACHE INTERNAL "${DESCRIPTION}")
124 set(${VARIABLE} 1 CACHE INTERNAL "Result of test for ${DESCRIPTION}" FORCE)
127 set(${VARIABLE} 0 CACHE INTERNAL "Result of test for ${DESCRIPTION}" FORCE)
133 SET (${CXXFLAGSVAR} "${${CXXFLAGSVAR}} ${${VARIABLE}_FLAG}" PARENT_SCOPE)
136 ENDFUNCTION(GMX_FIND_CXXFLAG_FOR_SOURCE VARIABLE DESCRIPTION SOURCE CXXFLAGSVAR)