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build: give priority to /sw and /opt/local on Mac OS X

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Unfortunately, we can't force the specific inclusion of a header file.
So if anything add /opt/local/include to the include path--such as
libintl--then other dependencies might be drawn from /opt/local at
compile time, even though we detected them elsewhere at configure time.
This, in turn, causes issues with mixed versions, such as the iconv.h
header being pulled from /opt/local/include, but linked against the
library in /usr/lib--which can be mismatched versions.

So, despite CMake's best effort to treat /sw and /opt/local as just
another system area, we really need to give them preferential treatment.
To do this, we add them to CMAKE_PREFIX_PATH.

This fixes an issue discovered while re-enabling iconv in #1370.
This commit is contained in:
John Szakmeister 2014-11-08 16:16:39 -05:00
parent 05f78d30ac
commit 203a5166a0
1 changed files with 20 additions and 11 deletions
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31
CMakeLists.txt
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@ -12,6 +12,26 @@ set(DEPS_BIN_DIR "${DEPS_INSTALL_DIR}/bin")
list(APPEND CMAKE_PREFIX_PATH ${DEPS_INSTALL_DIR})
if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
# CMake tries to treat /sw and /opt/local as extension of the system path, but
# that doesn't really work out very well. Once you have a dependency that
# resides there and have to add it as an include directory, then any other
# dependency that could be satisfied from there must be--otherwise you can end
# up with conflicting versions. So, let's make them more of a priority having
# them be included as one of the first places to look for dependencies.
list(APPEND CMAKE_PREFIX_PATH /sw /opt/local)
# Work around some old, broken detection by CMake for knowing when to use the
# isystem flag. Apple's compilers have supported this for quite some time
# now.
if(CMAKE_COMPILER_IS_GNUCC)
set(CMAKE_INCLUDE_SYSTEM_FLAG_C "-isystem ")
endif()
if(CMAKE_COMPILER_IS_GNUCXX)
set(CMAKE_INCLUDE_SYSTEM_FLAG_CXX "-isystem ")
endif()
endif()
# Version tokens
include(GetGitRevisionDescription)
get_git_head_revision(GIT_REFSPEC NVIM_VERSION_COMMIT)
@ -31,17 +51,6 @@ endif()
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
# Work around some old, broken detection by CMake for knowing when to use the
# isystem flag. Apple's compilers have supported this for quite some time now.
if(APPLE)
if(CMAKE_COMPILER_IS_GNUCC)
set(CMAKE_INCLUDE_SYSTEM_FLAG_C "-isystem ")
endif()
if(CMAKE_COMPILER_IS_GNUCXX)
set(CMAKE_INCLUDE_SYSTEM_FLAG_CXX "-isystem ")
endif()
endif()
# Default to -O2 on release builds.
string(REPLACE "-O3" "-O2" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")