MantisBT - CMake
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IDProjectCategoryView StatusDate SubmittedLast Update
0014457CMakeCMakepublic2013-10-03 03:182016-06-10 14:31
ReporterZachary Deretsky 
Assigned ToKitware Robot 
PriorityhighSeveritymajorReproducibilityalways
StatusclosedResolutionmoved 
PlatformLinuxOSUbuntuOS Version12.04
Product VersionCMake 2.8.11 
Target VersionFixed in Version 
Summary0014457: CMAKE_CXX_LIBRARY_ARCHITECTURE variable is not getting populated
DescriptionThe simple test case was created after many iterations by Stephen Kelly:

This CMakeLists.txt
zach@cloud1-12:~/QT/build$ cat ../CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
set(CMAKE_C_COMPILER $ENV{AZ_TOOL_PATH}/bin/gcc)
project(qtgui)
find_library(TEST_Qt5Gui_GL_LIBRARY GL)
message("TEST_Qt5Gui_GL_LIBRARY : ${TEST_Qt5Gui_GL_LIBRARY}")
message("CMAKE_CXX_LIBRARY_ARCHITECTURE ${CMAKE_CXX_LIBRARY_ARCHITECTURE}")

produces this result:
zach@cloud1-12:~/QT/build$ cmake ..
-- The C compiler identification is GNU 4.6.3
-- The CXX compiler identification is GNU 4.6.3
-- Check for working C compiler: /AZ/x86_64/kernel-3.2.0-25-virtual/glibc-2.15/2013-09-19-12.16.39/bin/gcc
-- Check for working C compiler: /AZ/x86_64/kernel-3.2.0-25-virtual/glibc-2.15/2013-09-19-12.16.39/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /AZ/x86_64/kernel-3.2.0-25-virtual/glibc-2.15/2013-09-19-12.16.39/bin/c++
-- Check for working CXX compiler: /AZ/x86_64/kernel-3.2.0-25-virtual/glibc-2.15/2013-09-19-12.16.39/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
TEST_Qt5Gui_GL_LIBRARY : TEST_Qt5Gui_GL_LIBRARY-NOTFOUND
CMAKE_CXX_LIBRARY_ARCHITECTURE
-- Configuring done
-- Generating done
-- Build files have been written to: /home/zach/QT/build

If I set CMAKE_CXX_LIBRARY_ARCHITECTURE in this CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
set(CMAKE_C_COMPILER $ENV{AZ_TOOL_PATH}/bin/gcc)
set(CMAKE_CXX_LIBRARY_ARCHITECTURE x86_64-linux-gnu)
project(qtgui)
find_library(TEST_Qt5Gui_GL_LIBRARY GL)
message("TEST_Qt5Gui_GL_LIBRARY : ${TEST_Qt5Gui_GL_LIBRARY}")
message("CMAKE_CXX_LIBRARY_ARCHITECTURE ${CMAKE_CXX_LIBRARY_ARCHITECTURE}")

I obtain:

zach@cloud1-12:~/QT/build$ cmake ..
-- The C compiler identification is GNU 4.6.3
-- The CXX compiler identification is GNU 4.6.3
-- Check for working C compiler: /AZ/x86_64/kernel-3.2.0-25-virtual/glibc-2.15/2013-09-19-12.16.39/bin/gcc
-- Check for working C compiler: /AZ/x86_64/kernel-3.2.0-25-virtual/glibc-2.15/2013-09-19-12.16.39/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /AZ/x86_64/kernel-3.2.0-25-virtual/glibc-2.15/2013-09-19-12.16.39/bin/c++
-- Check for working CXX compiler: /AZ/x86_64/kernel-3.2.0-25-virtual/glibc-2.15/2013-09-19-12.16.39/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
TEST_Qt5Gui_GL_LIBRARY : /usr/lib/x86_64-linux-gnu/libGL.so
CMAKE_CXX_LIBRARY_ARCHITECTURE x86_64-linux-gnu
-- Configuring done
-- Generating done
-- Build files have been written to: /home/zach/QT/build


Steps To Reproduce
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Issue History
Date ModifiedUsernameFieldChange
2013-10-03 03:18Zachary DeretskyNew Issue
2013-10-03 03:33Zachary DeretskyNote Added: 0033968
2013-10-03 08:08Brad KingNote Added: 0033970
2016-06-10 14:29Kitware RobotNote Added: 0042383
2016-06-10 14:29Kitware RobotStatusnew => resolved
2016-06-10 14:29Kitware RobotResolutionopen => moved
2016-06-10 14:29Kitware RobotAssigned To => Kitware Robot
2016-06-10 14:31Kitware RobotStatusresolved => closed

Notes
(0033968)
Zachary Deretsky   
2013-10-03 03:33   
Is the problem that I need to set
CMAKE_CXX_LIBRARY_ARCHITECTURE to x86_64-linux-gnu
because
zach@cloud1-12:~/QT/build$ ls -l /usr/lib/x86_64-linux-gnu/libGL.so
lrwxrwxrwx 1 root root 13 Jun 18 13:54 /usr/lib/x86_64-linux-gnu/libGL.so -> mesa/libGL.so

but

/AZ/x86_64/kernel-3.2.0-25-virtual/glibc-2.15/2013-09-19-12.16.39/bin/c++ -dumpmachine
x86_64-unknown-linux-gnu


x86_64-linux-gnu versus x86_64-unknown-linux-gnu ???
(0033970)
Brad King   
2013-10-03 08:08   
The code that populates the library architecture is here:

 http://cmake.org/gitweb?p=cmake.git;a=blob;f=Modules/CMakeDetermineCompilerABI.cmake;hb=v2.8.11.2#l117 [^]
 # Detect library architecture directory name.

Look at CMakeFiles/<cmake-version>/CMakeCXXCompiler.cmake for the value determined for CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES. CMake tries matching paths containing the arch triplet from that list of directories. If your toolchain is not configured to search /usr/lib/x86_64-linux-gnu implicitly then CMake won't pick it up automatically either.
(0042383)
Kitware Robot   
2016-06-10 14:29   
Resolving issue as `moved`.

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