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FindBoost: Call find_package with NO_MODULE first

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FindBoost now attempts to find Boost using find_package(Boost NO_MODULE)
before it does a module mode search.

User can now set any of these to Boost's install prefix to detect it in module
or config mode:

- Boost_DIR  for consistency with other CMake modules
- BOOST_ROOT or BOOSTROOT for adherence to boost convention
This commit is contained in:
Todd Gamblin 2011-08-27 10:48:55 -07:00 committed by Brad King
parent e85df15b7d
commit 7da796d1fd
1 changed files with 72 additions and 10 deletions
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74
Modules/FindBoost.cmake
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@ -92,6 +92,12 @@
# BOOST_ROOT. Defaults to OFF.
# [Since CMake 2.8.3]
#
# Boost_NO_BOOST_CMAKE Do not do a find_package call in config mode
# before searching for a regular boost install.
# This will avoid finding boost-cmake installs.
# Defaults to OFF.
# [Since CMake 2.8.6]
#
# Boost_USE_STATIC_RUNTIME If enabled, searches for boost libraries
# linked against a static C++ standard library
# ('s' ABI tag). This option should be set to
@ -164,13 +170,27 @@
#
# These last three variables are available also as environment variables:
# Also, note they are completely UPPERCASE.
# Also, note they are completely UPPERCASE, except Boost_DIR.
#
# BOOST_ROOT or BOOSTROOT The preferred installation prefix for searching for
# Boost. Set this if the module has problems finding
# the proper Boost installation. To prevent falling
# back on the system paths, set Boost_NO_SYSTEM_PATHS
# to true.
# Boost_DIR or The preferred installation prefix for searching for
# BOOST_ROOT or BOOSTROOT Boost. Set this if the module has problems finding
# the proper Boost installation.
#
# Note that Boost_DIR behaves exactly as <package>_DIR
# variables are documented to behave in find_package's
# Config mode. That is, if it is set as a -D argument
# to CMake, it must point to the location of the
# BoostConfig.cmake or Boost-config.cmake file. If it
# is set as an environment variable, it must point to
# the root of the boost installation. BOOST_ROOT and
# BOOSTROOT, on the other hand, will point to the root
# in either case.
#
# To prevent falling back on the system paths, set
# Boost_NO_SYSTEM_PATHS to true.
#
# To avoid finding boost-cmake installations, set
# Boost_NO_BOOST_CMAKE to true.
#
# BOOST_INCLUDEDIR Set this to the include directory of Boost, if the
# module has problems finding the proper Boost installation
@ -237,6 +257,43 @@
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
#-------------------------------------------------------------------------------
# Before we go searching, check whether boost-cmake is avaialble, unless the
# user specifically asked NOT to search for boost-cmake.
#
# If Boost_DIR is set, this behaves as any find_package call would. If not,
# it looks at BOOST_ROOT and BOOSTROOT to find Boost.
#
if (NOT Boost_NO_BOOST_CMAKE)
# If Boost_DIR is not set, look for BOOSTROOT and BOOST_ROOT as alternatives,
# since these are more conventional for Boost.
if ("$ENV{Boost_DIR}" STREQUAL "")
if (NOT "$ENV{BOOST_ROOT}" STREQUAL "")
set(ENV{Boost_DIR} $ENV{BOOST_ROOT})
elseif (NOT "$ENV{BOOSTROOT}" STREQUAL "")
set(ENV{Boost_DIR} $ENV{BOOSTROOT})
endif()
endif()
# Do the same find_package call but look specifically for the CMake version.
# Note that args are passed in the Boost_FIND_xxxxx variables, so there is no
# need to delegate them to this find_package call.
find_package(Boost QUIET NO_MODULE)
# If we found boost-cmake, then we're done. Print out what we found.
# Otherwise let the rest of the module try to find it.
if (Boost_FOUND)
message("Boost ${Boost_FIND_VERSION} found.")
if (Boost_FIND_COMPONENTS)
message("Found Boost components:")
message(" ${Boost_FIND_COMPONENTS}")
endif()
return()
endif()
endif()
#-------------------------------------------------------------------------------
# FindBoost functions & macros
#
@ -516,6 +573,11 @@ else(_boost_IN_CACHE)
_Boost_CHECK_SPELLING(Boost_LIBRARYDIR)
_Boost_CHECK_SPELLING(Boost_INCLUDEDIR)
# If BOOST_ROOT was defined in the environment, use it.
if (NOT BOOST_ROOT AND NOT $ENV{Boost_DIR} STREQUAL "")
set(BOOST_ROOT $ENV{Boost_DIR})
endif()
# If BOOST_ROOT was defined in the environment, use it.
if (NOT BOOST_ROOT AND NOT $ENV{BOOST_ROOT} STREQUAL "")
set(BOOST_ROOT $ENV{BOOST_ROOT})