CODEWITHSUNDEEP
c++macoscmakeclang
Ælex
Ælex

Reputation: 14869

OSX 10.10 CMake 3.0.2 and clang won't find local headers

On OSX 10.9 I had installed a variety of header libraries under

/usr/include
/usr/local/include

And everything worked fine. Today I did the "free upgrade" to Yosemite, and suddenly everything stopped working. Together with Yosemite, I also (previously) upgraded Xcode (note, I am not compiling using Xcode, but clang directly via command line).

I have a CMakeLists.txt which clearly includes /usr/include

set(INCLUDE_HEADERS ${INCLUDE_HEADERS}
             /usr/include
             /usr/local/include)
include_directories(SYSTEM ${INCLUDE_HEADERS})

Yet, when I try to compile, I instantly get:

fatal error: 'boost/lexical_cast.hpp' file not found
#include <boost/lexical_cast.hpp>

What's going on here? Anyone else experience this, or even know how to solve it? Things were working fine in 10.9 (oh why did I upgrade?) I may also be doing something wrong as I noticed that cmake was upgraded to 3.0.2

Upvotes: 3

Views: 1481

Answers (2)

Alexander Stavonin
Alexander Stavonin

Reputation: 670

Canonical way for such situations is:

find_package(boost REQUIRED)
if(Boost_FOUND)
    include_directories(${boost_INCLUDE_DIRS})
endif()

It will add path to the BOOST header into compiler search path.

Upvotes: 2

&#198;lex
&#198;lex

Reputation: 14869

I found the problem and a solution. Problem is that by default, clang appears to search only in the SDK folder of the platform:

-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk

This didn't use to happen before, or I had somehow changed without knowing. So, I changed my .bash_profile in my home dir, and added:

export C_INCLUDE_PATH=/usr/include:/usr/local/include
export CPLUS_INCLUDE_PATH=/usr/include:/usr/local/include

Close and reopen a new terminal, and now clang finds the include dirs, and works fine. Although I'm troubled by the fact that only the latter (/usr/local/include) appears to be used with the -I flag.

Upvotes: 3

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