Marco Atzeri wrote:
On 26/07/2016 17:10, LMH wrote:
Csaba Raduly wrote:
Steps for building in a separate build directory:
mkdir _build
cd _build
cmake ..
Csaba
I looked for the syntax for this when I first started. I assumed the the
author put the CMakeLists.txt file in the right place. I almost never
have my make file in the src directory when using gnu make, so this
looked the same to me. I didn't find any doc about how to have the
CMakeLists.txt and the src in different directories.
Csaba was clear but it seems you are misunderstanding,
the call to cmake is
cmake [options] <path-to-source>
so I will put together his suggestion and Tony's one:
$ git pull https://bitbucket.org/tomilov/quickhull/src
$ ls src/
CMakeLists.txt include README.md src test
$ mkdir build
$ cd build
$ cmake -DCMAKE_CXX_COMPILER=clang ../src
the "build" directory is in this case parallel to the "src" one.
Unfortunately it will fail on "Compiler does not support C++1z standard"
and you will need to modify the original CMakeLists.txt.
I cut
-------------------------------------------------------------------
-CHECK_CXX_COMPILER_FLAG("-std=gnu++1z" COMPILER_SUPPORTS_CXX1Z)
-if(NOT COMPILER_SUPPORTS_CXX1Z)
- message(FATAL_ERROR "Compiler does not support C++1z standard")
-endif()
-add_compile_options("-std=gnu++1z")
-------------------------------------------------------------------
But there are other issues on the road; I passed some with
cmake -DCMAKE_CXX_COMPILER=clang -DCMAKE_CXX_FLAGS="-std=gnu++1z
-I/usr/lib/gcc/x86_64-pc-cygwin/5.4.0/include/c++/
-I/usr/lib/gcc/x86_64-pc-cygwin/5.4.0/include/c++/x86_64-pc-cygwin/" ../src
but the build stop here
--------------------------------------------------------------------------
/pub/temp/src/src/simple_use.cpp:146:16: fatal error: no member named 'chrono'
in
namespace 'std'
using std::chrono::duration_cast;
~~~~~^
15 warnings and 1 error generated.
make[2]: *** [CMakeFiles/qh.dir/build.make:66:
CMakeFiles/qh.dir/src/simple_use.cpp.o] Error 1
---------------------------------------------------------------------------
and I am out of my C++ knowledge
Regards
Marco
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Thanks you for the clarification.
I implemented your steps,
$ ls src/
CMakeLists.txt include README.md src test
$ mkdir build
$ cd build/
$ cmake -DCMAKE_CXX_COMPILER=clang ../src
I get the following output, which is the same error output I was getting before. It
is different then the errors you are specifying.
-- The C compiler identification is GNU 4.9.3
-- The CXX compiler identification is unknown
CMake Warning at /usr/share/cmake-3.3.2/Modules/Platform/CYGWIN.cmake:15
(message):
CMake no longer defines WIN32 on Cygwin!
(1) If you are just trying to build this project, ignore this warning or
quiet it by setting CMAKE_LEGACY_CYGWIN_WIN32=0 in your environment or in
the CMake cache. If later configuration or build errors occur then this
project may have been written under the assumption that Cygwin is WIN32.
In that case, set CMAKE_LEGACY_CYGWIN_WIN32=1 instead.
(2) If you are developing this project, add the line
set(CMAKE_LEGACY_CYGWIN_WIN32 0) # Remove when CMake >= 2.8.4 is required
at the top of your top-level CMakeLists.txt file or set the minimum
required version of CMake to 2.8.4 or higher. Then teach your project to
build on Cygwin without WIN32.
Call Stack (most recent call first):
/usr/share/cmake-3.3.2/Modules/CMakeSystemSpecificInformation.cmake:36
(include)
CMakeLists.txt:1 (project)
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/clang
-- Check for working CXX compiler: /usr/bin/clang -- broken
CMake Error at /usr/share/cmake-3.3.2/Modules/CMakeTestCXXCompiler.cmake:54
(message):
The C++ compiler "/usr/bin/clang" is not able to compile a simple test
program.
It fails with the following output:
Change Dir:
/cygdrive/g/shared_data/SMD/ATomilov_quickhull/build/CMakeFiles/CMakeTmp
Run Build Command:"/usr/bin/make.exe" "cmTC_e1f3f/fast"
/usr/bin/make -f CMakeFiles/cmTC_e1f3f.dir/build.make
CMakeFiles/cmTC_e1f3f.dir/build
make[1]: Entering directory
'/cygdrive/g/shared_data/SMD/ATomilov_quickhull/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_e1f3f.dir/testCXXCompiler.cxx.o
/usr/bin/clang -o CMakeFiles/cmTC_e1f3f.dir/testCXXCompiler.cxx.o -c
/cygdrive/g/shared_data/SMD/ATomilov_quickhull/build/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
CMakeFiles/cmTC_e1f3f.dir/build.make:65: recipe for target
'CMakeFiles/cmTC_e1f3f.dir/testCXXCompiler.cxx.o' failed
make[1]: Leaving directory
'/cygdrive/g/shared_data/SMD/ATomilov_quickhull/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_e1f3f/fast' failed
make[1]: *** [CMakeFiles/cmTC_e1f3f.dir/testCXXCompiler.cxx.o] Error 127
make: *** [cmTC_e1f3f/fast] Error 2
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:1 (project)
-- Configuring incomplete, errors occurred!
See also
"/cygdrive/g/shared_data/SMD/ATomilov_quickhull/build/CMakeFiles/CMakeOutput.log".
See also
"/cygdrive/g/shared_data/SMD/ATomilov_quickhull/build/CMakeFiles/CMakeError.log".
It looks like it is still using gnu for the compiler and not clang. It looks like it
can't identify the c++ compiler at all. I tried this,
cmake -DCMAKE_CXX_COMPILER=clang++ ../src
because I think that CXX is the c++ compiler, but this doesn't make any difference. I
have attached the cmake error and output logs in case that is useful.
It just looks like there is something missing or misconfigured in my installation.
The which clang and which clang++ commands return the expected values. If cmake isn't
able to build a test app, then there is something wrong at that end I think.
LMH
The system is: CYGWIN - 2.3.1(0.291/5/3) - i686
Compiling the C compiler identification source file "CMakeCCompilerId.c"
succeeded.
Compiler: /usr/bin/cc
Build flags:
Id flags:
The output was:
0
Compilation of the C compiler identification source "CMakeCCompilerId.c"
produced "a.exe"
The C compiler identification is GNU, found in
"/cygdrive/g/shared_data/SMD/ATomilov_quickhull/build/CMakeFiles/3.3.2/CompilerIdC/a.exe"
Determining if the C compiler works passed with the following output:
Change Dir:
/cygdrive/g/shared_data/SMD/ATomilov_quickhull/build/CMakeFiles/CMakeTmp
Run Build Command:"/usr/bin/make.exe" "cmTC_25c78/fast"
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CMakeFiles/cmTC_25c78.dir/build
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Detecting C [-std=c11] compiler features compiled with the following output:
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Detecting C [-std=c90] compiler features compiled with the following output:
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Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp"
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