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Avoid clobbering externally-set variables.

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This commit is contained in:
Alessandro Gatti 2015-01-07 17:54:05 +01:00
parent 4130129216
commit 64fc284a52
1 changed files with 43 additions and 17 deletions
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38
CMakeLists.txt
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@ -17,7 +17,13 @@
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Taken from https://gist.github.com/steakknife/c36c99b51703fc6f6c1b
# The following macro has been adapted from
# https://gist.github.com/steakknife/c36c99b51703fc6f6c1b
# If is running under Mac OS X and the Homebrew package manager is installed,
# then Homebrew-specific directories for the given package are automatically
# added to the appropriate CMake search paths.
macro(find_package_prefer_brew _package)
unset(_brew_path)
unset(_brew_pkg_lower)
@ -25,26 +31,41 @@ macro(find_package_prefer_brew _package)
find_program(_has_brew NAMES brew DOC "path to Homebrew executable")
if(_has_brew)
string(TOLOWER ${_package} _brew_pkg_lower)
execute_process(COMMAND brew --prefix ${_brew_pkg_lower} ERROR_QUIET OUTPUT_VARIABLE _brew_path)
if(_brew_path)
string(REGEX REPLACE "\n" "" _brew_path ${_brew_path})
endif(_brew_path)
execute_process(COMMAND brew --prefix ${_brew_pkg_lower} ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE OUTPUT_VARIABLE _brew_path)
if(EXISTS ${_brew_path})
list(INSERT CMAKE_MODULE_PATH 0 "${_brew_path}")
set(BREW_CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH})
set(BREW_CMAKE_PROGRAM_PATH ${CMAKE_PROGRAM_PATH})
set(BREW_CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH})
set(BREW_CMAKE_LIBRARY_PATH ${CMAKE_LIBRARY_PATH})
if(NOT CMAKE_MODULE_PATH)
list(INSERT CMAKE_MODULE_PATH 0 "${_brew_path}")
endif(NOT CMAKE_MODULE_PATH)
if(NOT CMAKE_PROGRAM_PATH)
if(EXISTS "${_brew_path}/bin")
list(INSERT CMAKE_PROGRAM_PATH 0 "${_brew_path}/bin")
endif(EXISTS "${_brew_path}/bin")
endif(NOT CMAKE_PROGRAM_PATH)
if(NOT CMAKE_INCLUDE_PATH)
if(EXISTS "${_brew_path}/include")
list(INSERT CMAKE_INCLUDE_PATH 0 "${_brew_path}/include")
endif(EXISTS "${_brew_path}/include")
endif(NOT CMAKE_INCLUDE_PATH)
if(NOT CMAKE_LIBRARY_PATH)
if(EXISTS "${_brew_path}/lib")
list(INSERT CMAKE_LIBRARY_PATH 0 "${_brew_path}/lib")
endif(EXISTS "${_brew_path}/lib")
endif(NOT CMAKE_LIBRARY_PATH)
find_package(${_package} ${ARGN})
set(CMAKE_MODULE_PATH ${BREW_CMAKE_MODULE_PATH})
set(CMAKE_PROGRAM_PATH ${BREW_CMAKE_PROGRAM_PATH})
set(CMAKE_INCLUDE_PATH ${BREW_CMAKE_INCLUDE_PATH})
set(CMAKE_LIBRARY_PATH ${BREW_CMAKE_LIBRARY_PATH})
else(EXISTS ${_brew_path})
find_package(${_package} ${ARGN})
endif(EXISTS ${_brew_path})
@ -82,8 +103,13 @@ endif()
## 2. Find Flex and Bison
if (CMAKE_HOST_APPLE)
find_package_prefer_brew(BISON REQUIRED)
find_package_prefer_brew(FLEX 2.5 REQUIRED)
else (CMAKE_HOST_APPLE)
find_package(BISON REQUIRED)
find_package(FLEX 2.5 REQUIRED)
endif (CMAKE_HOST_APPLE)
if (BISON_VERSION VERSION_LESS 2.5)
message(FATAL_ERROR "At least Bison 2.5 is required.")