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Diffstat (limited to 'cmakemodules/MacroEnsureVersion.cmake')
| -rw-r--r-- | cmakemodules/MacroEnsureVersion.cmake | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/cmakemodules/MacroEnsureVersion.cmake b/cmakemodules/MacroEnsureVersion.cmake new file mode 100644 index 0000000..091152d --- /dev/null +++ b/cmakemodules/MacroEnsureVersion.cmake @@ -0,0 +1,28 @@ +# LGPL-v2, David Faure +# +# This macro compares version numbers of the form "x.y.z" +# MACRO_ENSURE_VERSION( ${FOO_MIN_VERSION} ${FOO_VERSION_FOUND} FOO_VERSION_OK) +# will set FOO_VERSIN_OK to true if FOO_VERSION_FOUND >= FOO_MIN_VERSION +# +MACRO(MACRO_ENSURE_VERSION requested_version found_version var_too_old) + + # parse the parts of the version string + STRING(REGEX REPLACE "([0-9]+)\\.[0-9]+\\.[0-9]+" "\\1" req_major_vers "${requested_version}") + STRING(REGEX REPLACE "[0-9]+\\.([0-9])+\\.[0-9]+" "\\1" req_minor_vers "${requested_version}") + STRING(REGEX REPLACE "[0-9]+\\.[0-9]+\\.([0-9]+)" "\\1" req_patch_vers "${requested_version}") + + STRING(REGEX REPLACE "([0-9]+)\\.[0-9]+\\.[0-9]+.*" "\\1" found_major_vers "${found_version}") + STRING(REGEX REPLACE "[0-9]+\\.([0-9])+\\.[0-9]+.*" "\\1" found_minor_vers "${found_version}") + STRING(REGEX REPLACE "[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1" found_patch_vers "${found_version}") + + # compute an overall version number which can be compared at once + MATH(EXPR req_vers_num "${req_major_vers}*10000 + ${req_minor_vers}*100 + ${req_patch_vers}") + MATH(EXPR found_vers_num "${found_major_vers}*10000 + ${found_minor_vers}*100 + ${found_patch_vers}") + + if (found_vers_num LESS req_vers_num) + set( ${var_too_old} FALSE ) + else (found_vers_num LESS req_vers_num) + set( ${var_too_old} TRUE ) + endif (found_vers_num LESS req_vers_num) + +ENDMACRO(MACRO_ENSURE_VERSION) |