> What is returned if string(FIND) matches a substring, and what is > returned if it doesn't match anything?
The documentation says: http://cmake.org/cmake/help/v2.8.12/cmake.html#command:string http://www.cmake.org/cmake/help/v3.0/command/string.html string(FIND <string> <substring> <output variable> [REVERSE]) "FIND will return the position where the given substring was found in the supplied string." Wow, that's on the light side. When the documentation is insufficient, experimentation is your friend... (or source code analysis) This script: string(FIND "this is a haystack, purely hay" "needle" pos1) message("pos1='${pos1}'") string(FIND "needle resting right on a haystack" "needle" pos2) message("pos2='${pos2}'") string(FIND "a haystack on top of a needle" "needle" pos3) message("pos3='${pos3}'") string(FIND "a haystack with a needle buried in the middle of it" "needle" pos4) message("pos4='${pos4}'") string(FIND "needle hay hay needle hay hay needle hay hay needle" "needle" pos5) message("pos5='${pos5}'") string(FIND "this is a haystack, purely hay" "needle" pos6 REVERSE) message("pos6='${pos6}'") string(FIND "needle resting right on a haystack" "needle" pos7 REVERSE) message("pos7='${pos7}'") string(FIND "a haystack on top of a needle" "needle" pos8 REVERSE) message("pos8='${pos8}'") string(FIND "a haystack with a needle buried in the middle of it" "needle" pos9 REVERSE) message("pos9='${pos9}'") string(FIND "needle hay hay needle hay hay needle hay hay needle" "needle" pos10 REVERSE) message("pos10='${pos10}'") Produces this output: pos1='-1' pos2='0' pos3='23' pos4='18' pos5='0' pos6='-1' pos7='0' pos8='23' pos9='18' pos10='45' The C++ source code implementation uses std::string::find, or if the REVERSE option is used, std::string::rfind. The returned value is exactly what find or rfind returns if the substring is found, or it is exactly "-1" if it is not found. So: a zero-based offset from the beginning of the string, where a value of zero means the substring occurs starting at the very first character of the string. HTH, David C. -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://www.cmake.org/mailman/listinfo/cmake
