I have a C++ library packaged with conan and it contains a test_package with a conanfile.py that uses the new conan 2.0 self.requries(self.tested_reference_str) and test_type = "explicit".
When not cross-building everything runs fine. I can build the library using conan build . and build and run the consumer test_package.
In case of cross-building, the main library can be built without issues. However, the build of the test_package fails with:
----Running------
> . "/work/tests/test_package/build/generators/conanbuild.sh" && cmake -G "Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE="/work/tests/test_package/build/generators/conan_toolchain.cmake" -DCMAKE_POLICY_DEFAULT_CMP0091="NEW" -DCMAKE_BUILD_TYPE="Release" "/work/tests/test_package/."
-----------------
-- Using Conan toolchain: /work/tests/test_package/build/generators/conan_toolchain.cmake
-- The CXX compiler identification is GNU 11.3.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - failed
-- Check for working CXX compiler: /opt/poky/4.0.5/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-g++
-- Check for working CXX compiler: /opt/poky/4.0.5/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-g++ - broken
CMake Error at /opt/poky/4.0.5/sysroots/x86_64-pokysdk-linux/usr/share/cmake-3.22/Modules/CMakeTestCXXCompiler.cmake:62 (message):
The C++ compiler
"/opt/poky/4.0.5/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-g++"
is not able to compile a simple test program.
It fails with the following output:
Change Dir: /work/tests/test_package/build/Release/CMakeFiles/CMakeTmp
Run Build Command(s):/usr/bin/gmake -f Makefile cmTC_8ea64/fast && /usr/bin/gmake -f CMakeFiles/cmTC_8ea64.dir/build.make CMakeFiles/cmTC_8ea64.dir/build
gmake[1]: Entering directory '/work/tests/test_package/build/Release/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_8ea64.dir/testCXXCompiler.cxx.o
/opt/poky/4.0.5/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-g++ -O2 -pipe -g -feliminate-unused-debug-types -stdlib=libstdc++ -o CMakeFiles/cmTC_8ea64.dir/testCXXCompiler.cxx.o -c /work/tests/test_package/build/Release/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
arm-poky-linux-gnueabi-g++: error: unrecognized command-line option ‘-stdlib=libstdc++’
gmake[1]: *** [CMakeFiles/cmTC_8ea64.dir/build.make:78: CMakeFiles/cmTC_8ea64.dir/testCXXCompiler.cxx.o] Error 1
gmake[1]: Leaving directory '/work/tests/test_package/build/Release/CMakeFiles/CMakeTmp'
gmake: *** [Makefile:127: cmTC_8ea64/fast] Error 2
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:2 (project)
host profile:
[settings]
os=Linux
arch=armv7hf
compiler=clang
compiler.version=14
# Tried also with libc++
compiler.libcxx=libstdc++11
build_type=Release
build profile:
[settings]
os=Linux
arch=x86_64
compiler=gcc
compiler.version=11
# Without the following the error becomes:
# arm-poky-linux-gnueabi-g++: error: unrecognized command-line option ‘-stdlib=libc++’
compiler.libcxx=libstdc++11
build_type=Release
[env]
CC=gcc-11
CXX=g++-11
Any idea why cross compiling works for the library itself but the test_package fails?
Edit: I looked into conaninfo.txt, CMakeCache.txt, for both: the library generated files and the test_package generated files. Conan specifies the clang compiler in both cases (library build and test_package) but CMake uses anyway the GNU compiler for the test_package. It seems the CMAKE_CXX_COMPILER is not passed correctly to CMake in case of the test_package. A conan install inside the test_package folder also results in the wrong compiler (GNU) being used.
Related
Hello i am quite new to linux and i am trying to do some cross-compilation to run a flutter app on an external device.
Setup :
VM under virtual box : Ubuntu 22.04 LTS
External device : (imx8) with arm64
So i need to compile my app to match the arm64 architecture but i am having many errors that i have no idea how to fix and no idea where they come from :
Failed to cmake:
-- The CXX compiler identification is Clang 14.0.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - failed
-- Check for working CXX compiler: /usr/bin/clang++
-- Check for working CXX compiler: /usr/bin/clang++ - broken
-- Configuring incomplete, errors occurred!
See also "/home/tom/test_app/build/elinux/arm64/release/CMakeFiles/CMakeOutput.log".
See also "/home/tom/test_app/build/elinux/arm64/release/CMakeFiles/CMakeError.log".
CMake Error at /usr/share/cmake-3.22/Modules/CMakeTestCXXCompiler.cmake:62 (message):
The C++ compiler
"/usr/bin/clang++"
is not able to compile a simple test program.
It fails with the following output:
Change Dir: /home/tom/test_app/build/elinux/arm64/release/CMakeFiles/CMakeTmp
Run Build Command(s):/usr/bin/gmake -f Makefile cmTC_46f48/fast && /usr/bin/gmake -f CMakeFiles/cmTC_46f48.dir/build.make CMakeFiles/cmTC_46f48.dir/build
gmake[1]: Entering directory '/home/tom/test_app/build/elinux/arm64/release/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_46f48.dir/testCXXCompiler.cxx.o
/usr/bin/clang++ --target=aarch64-linux-gnu --sysroot=/opt/arm64-sysroot -MD -MT CMakeFiles/cmTC_46f48.dir/testCXXCompiler.cxx.o -MF
CMakeFiles/cmTC_46f48.dir/testCXXCompiler.cxx.o.d -o CMakeFiles/cmTC_46f48.dir/testCXXCompiler.cxx.o -c
/home/tom/test_app/build/elinux/arm64/release/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
Linking CXX executable cmTC_46f48
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_46f48.dir/link.txt --verbose=1
/usr/bin/clang++ --target=aarch64-linux-gnu --sysroot=/opt/arm64-sysroot CMakeFiles/cmTC_46f48.dir/testCXXCompiler.cxx.o -o cmTC_46f48
/usr/bin/aarch64-linux-gnu-ld: cannot find Scrt1.o: No such file or directory
/usr/bin/aarch64-linux-gnu-ld: cannot find crti.o: No such file or directory
/usr/bin/aarch64-linux-gnu-ld: cannot find crtbeginS.o: No such file or directory
/usr/bin/aarch64-linux-gnu-ld: cannot find -lstdc++: No such file or directory
/usr/bin/aarch64-linux-gnu-ld: cannot find -lm: No such file or directory
/usr/bin/aarch64-linux-gnu-ld: cannot find -lgcc_s: No such file or directory
/usr/bin/aarch64-linux-gnu-ld: cannot find -lgcc: No such file or directory
/usr/bin/aarch64-linux-gnu-ld: cannot find -lc: No such file or directory
/usr/bin/aarch64-linux-gnu-ld: cannot find -lgcc_s: No such file or directory
/usr/bin/aarch64-linux-gnu-ld: cannot find -lgcc: No such file or directory
/usr/bin/aarch64-linux-gnu-ld: cannot find crtendS.o: No such file or directory
/usr/bin/aarch64-linux-gnu-ld: cannot find crtn.o: No such file or directory
clang: error: linker command failed with exit code 1 (use -v to see invocation)
gmake[1]: *** [CMakeFiles/cmTC_46f48.dir/build.make:100: cmTC_46f48] Error 1
gmake[1]: Leaving directory '/home/tom/test_app/build/elinux/arm64/release/CMakeFiles/CMakeTmp'
gmake: *** [Makefile:127: cmTC_46f48/fast] Error 2
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:2 (project)
For more specification, i am using the flutter-elinux package to cross-compile and i have raised an issue there, but i am not sure the issue comes from the package as i don't know anything about linux compilation.
I have installed manually the following packages :
sudo apt install cpp-aarch64-linux-gnu
sudo apt install binutils-aarch64-linux-gnu
Thanks in advance for any help i really need to get this working...
EDIT : i have tried another solution using a docker container and the image arm64v8/ubuntu:18.04.
I have created a systroot ubuntu18-arm64-sysroot on my host and i use it to compile my app in arm64 arch. I am having the following error only :
Failed to cmake:
-- The CXX compiler identification is unknown
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - failed
-- Check for working CXX compiler: /home/tom/ubuntu18-arm64-sysroot/usr/bin/clang++
-- Check for working CXX compiler: /home/tom/ubuntu18-arm64-sysroot/usr/bin/clang++ - broken
-- Configuring incomplete, errors occurred!
See also "/home/tom/test_app/build/elinux/arm64/debug/CMakeFiles/CMakeOutput.log".
See also "/home/tom/test_app/build/elinux/arm64/debug/CMakeFiles/CMakeError.log".
CMake Error at /usr/share/cmake-3.22/Modules/CMakeTestCXXCompiler.cmake:62 (message):
The C++ compiler
"/home/tom/ubuntu18-arm64-sysroot/usr/bin/clang++"
is not able to compile a simple test program.
It fails with the following output:
Change Dir: /home/tom/test_app/build/elinux/arm64/debug/CMakeFiles/CMakeTmp
Run Build Command(s):/usr/bin/gmake -f Makefile cmTC_848af/fast && /usr/bin/gmake -f
CMakeFiles/cmTC_848af.dir/build.make CMakeFiles/cmTC_848af.dir/build
gmake[1]: Entering directory '/home/tom/test_app/build/elinux/arm64/debug/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_848af.dir/testCXXCompiler.cxx.o
/home/tom/ubuntu18-arm64-sysroot/usr/bin/clang++ -o CMakeFiles/cmTC_848af.dir/testCXXCompiler.cxx.o -c
/home/tom/test_app/build/elinux/arm64/debug/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
aarch64-binfmt-P: Could not open '/lib/ld-linux-aarch64.so.1': No such file or directory
gmake[1]: *** [CMakeFiles/cmTC_848af.dir/build.make:78: CMakeFiles/cmTC_848af.dir/testCXXCompiler.cxx.o] Error 255
gmake[1]: Leaving directory '/home/tom/test_app/build/elinux/arm64/debug/CMakeFiles/CMakeTmp'
gmake: *** [Makefile:127: cmTC_848af/fast] Error 2
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:2 (project)
TLDR
Im building a static library and linking it to an executable. Im generating makefiles with cmake. When I generate the makefile for cl (The compiler from visual studio) I have no problems, but when I generate the makefile for clang I get an undefined symbol.
Versions:
cmake version 3.18.1
clang version 11.0.0
Target: x86_64-pc-windows-msvc
Thread model: posix
cl version 19.26.28806 for x64
Minimal Example
I have the following structure for the proyect:
Proyect Root
│ CMakeLists.txt
│ foo.cpp
│ foo.hpp
│ main.cpp
│
└───bin
And this are the contents of the files:
foo.hpp
namespace foo {
void do_stuff(void);
}
foo.cpp
#include <foo.hpp>
namespace foo {
void do_stuff(void) {}
}
main.cpp
#include <foo.hpp>
int main(void) {
foo::do_stuff();
return 0;
}
And CMakeLists.txt
cmake_minimum_required(VERSION 3.0.0)
project(CompileAndLinkLib)
include_directories(".")
file(GLOB FOO_SRC "foo.cpp")
add_library(foo STATIC ${FOO_SRC})
add_executable(main "main.cpp")
target_link_libraries(main foo)
Correct linking
First I call vcvarsall.bat. I generate a nmake file with the following command:
cmake .. -G "NMake Makefiles"
And compile with:
nmake
The project compiles and links correctly
The undefined symbol
I generate the make file with the following command:
cmake .. -G "Unix Makefiles" -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
And when I compile with make I get the following output:
Scanning dependencies of target foo
[ 25%] Building CXX object CMakeFiles/foo.dir/foo.cpp.obj
[ 50%] Linking CXX static library foo.lib
[ 50%] Built target foo
Scanning dependencies of target main
[ 75%] Building CXX object CMakeFiles/main.dir/main.cpp.obj
[100%] Linking CXX executable main.exe
lld-link: error: undefined symbol: void __cdecl foo::do_stuff(void)
>>> referenced by C:\Users\pabsa\temp\main.cpp:4
>>> CMakeFiles/main.dir/main.cpp.obj:(main)
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [main.exe] Error 1
make[1]: *** [CMakeFiles/main.dir/all] Error 2
make: *** [all] Error 2
Im not sure if im doing something wrong, like if im missing something, or if this is an error with the makefile generated by cmake.
I just had the same problem, but with Clang 13. It could be solved with specifying clang as compiler in the CMakeLists, instead of letting CMake determine it automatically.
set(CMAKE_CXX_COMPILER "clang++")
(And yes, I read your original question correct, using this:
-DCMAKE_CXX_COMPILER=clang++
as an additional argument for cmake did not work for me as well, even if it looks like it should behave the same as setting it in CMakeLists.txt)
I tested again with:
clang version 12.0.0
Target: x86_64-pc-windows-msvc
Thread model: posix
And it worked corretly. Seems like it was a problem with clang 11
You're overcomplicating things imo. What about just "cmake .. -T ClangCL && cmake --build ."? Builds fine for me:
C:\Users\vital\test\_build>cmake .. -T ClangCL
-- Building for: Visual Studio 17 2022
-- Selecting Windows SDK version 10.0.20348.0 to target Windows 10.0.22000.
-- The C compiler identification is Clang 14.0.5 with MSVC-like command-line
-- The CXX compiler identification is Clang 14.0.5 with MSVC-like command-line
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/Llvm/x64/bin/clang-cl.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/Llvm/x64/bin/clang-cl.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Users/vital/test/_build
C:\Users\vital\test\_build>cmake --build .
MSBuild version 17.3.1+2badb37d1 for .NET Framework
Checking Build System
Building Custom Rule C:/Users/vital/test/CMakeLists.txt
foo.vcxproj -> C:\Users\vital\test\_build\Debug\foo.lib
Building Custom Rule C:/Users/vital/test/CMakeLists.txt
main.vcxproj -> C:\Users\vital\test\_build\Debug\main.exe
Building Custom Rule C:/Users/vital/test/CMakeLists.txt
C:\Users\vital\test\_build>
I'm trying to compile SDL2 (https://www.libsdl.org/download-2.0.php) using CMake with clang + lld (http://releases.llvm.org/) + mingw (https://sourceforge.net/projects/mingw-w64/) headers on Windows 10. Despite my many efforts, I seem unable to get CMake to use the lld linker over the mingw ld linker.
I currently build sdl2 with a batch file:
#ECHO OFF
IF NOT EXIST build MKDIR build
PUSHD build
cmake.exe -DCMAKE_BUILD_TYPE=Debug -G "MinGW Makefiles"^
-DCMAKE_C_FLAGS="-target x86_64-windows-gnu"^
-DCMAKE_C_COMPILER_ID="Clang" -DCMAKE_C_COMPILER="clang.exe"^
-DCMAKE_CXX_FLAGS="-target x86_64-windows-gnu"^
-DCMAKE_CXX_COMPILER_ID="Clang++" -DCMAKE_CXX_COMPILER="clang++.exe"^
-DDIRECTX=OFF -DSDL_TEST=OFF -DSDL_SHARED=OFF -DSDL_STATIC=ON ..
cmake.exe --build . -- -j %NUMBER_OF_PROCESSORS%
POPD
I have tried to no avail:
setting -fuse-ld=lld.exe
setting LDFLAGS=lld.exe
setting -DCMAKE_LINKER=lld.exe
the solution from: CMake: use a custom linker
Any help would be greatly appreciated.
To replicate your environment, I followed these steps:
I installed LLVM+Clang 12 to C:\Program Files\LLVM from the GitHub releases page: https://github.com/llvm/llvm-project/releases/download/llvmorg-12.0.0/LLVM-12.0.0-win64.exe
I downloaded mingw-w64 via MSYS2. I have it installed to C:\msys64. See: https://www.msys2.org/
I then downloaded SDL2 2.0.14 from https://www.libsdl.org/release/SDL2-2.0.14.zip and unzipped it to D:\SDL2-2.0.14
I have CMake 3.20 and Ninja 1.10.2 installed system-wide and in the PATH.
Then, I created D:\clang-mingw.cmake with the following contents:
set(CMAKE_C_COMPILER "C:/Program Files/LLVM/bin/clang.exe")
set(CMAKE_CXX_COMPILER "C:/Program Files/LLVM/bin/clang++.exe")
set(CMAKE_C_COMPILER_TARGET x86_64-windows-gnu)
set(CMAKE_CXX_COMPILER_TARGET x86_64-windows-gnu)
set(CMAKE_SYSROOT "C:/msys64/mingw64")
set(CMAKE_EXE_LINKER_FLAGS_INIT "-fuse-ld=lld")
set(CMAKE_MODULE_LINKER_FLAGS_INIT "-fuse-ld=lld")
set(CMAKE_SHARED_LINKER_FLAGS_INIT "-fuse-ld=lld")
This is called a toolchain file. These are used to inform CMake about non-standard compiler and library setups like this one.
Setting the CMAKE_<LANG>_COMPILER variables (naturally) points CMake to the compilers you want to use. In this case, that's Clang.
Setting CMAKE_<LANG>_COMPILER_TARGET configures Clang to use the x86_64-windows-gnu target when compiling. This is important for CMake's compiler detection and sanity checking steps.
Setting CMAKE_SYSROOT informs Clang where to find all of the standard libraries and headers (ie. those from mingw-w64).
Finally, we ensure LLD is used by adding -fuse-ld=lld to the linker flags used when linking executables, loadable modules, and shared libraries (but not static libraries, since no linker is needed, just the archiver). The CMAKE_{EXE,MODULE,SHARED}_LINKER_FLAGS_INIT variables are meant to be set from the toolchain for this purpose.
Then from a normal command prompt (i.e. not a Visual Studio command prompt or MSYS2 bash), I ran:
D:\SDL2-2.0.14>cmake -G Ninja -S . -B build -DCMAKE_TOOLCHAIN_FILE=D:/clang-mingw.cmake -DCMAKE_BUILD_TYPE=Debug -DDIRECTX=OFF -DSDL_TEST=OFF -DSDL_SHARED=OFF -DSDL_STATIC=ON
-- The C compiler identification is Clang 12.0.0
-- The CXX compiler identification is Clang 12.0.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Program Files/LLVM/bin/clang.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files/LLVM/bin/clang++.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE)
-- Performing Test HAVE_GCC_WALL
-- Performing Test HAVE_GCC_WALL - Success
[... output clipped ...]
The configure command I used does little more than replicate the SDL-specific settings you used in your question. It just selects Ninja as the build system generator (you could of course replace this with a different one if you so desired) and sets the toolchain file to the one above.
It then builds without errors.
D:\SDL2-2.0.14>cmake --build build
[... output clipped ...]
[163/164] C:\PROGRA~1\LLVM\bin\clang.exe --target=x86_64-windows-gnu --sysroot=C:/msys64/mingw64 -DUSING_GENERATED_CONFIG_H -Iinclude -I../include -idirafter "D:/SDL2-2.0.14/src/video/khronos" "-ID:/SDL2-2.0.14/src/hidapi/hidapi" -msse3 -msse2 -msse -m3dnow -mmmx -Wshadow -fvisibility=hidden -Wdeclaration-after-statement -Werror=declaration-after-statement -fno-strict-aliasing -Wall -g -MD -MT CMakeFiles/SDL2-static.dir/src/video/yuv2rgb/yuv_rgb.c.obj -MF CMakeFiles\SDL2-static.dir\src\video\yuv2rgb\yuv_rgb.c.obj.d -o CMakeFiles/SDL2-static.dir/src/video/yuv2rgb/yuv_rgb.c.obj -c ../src/video/yuv2rgb/yuv_rgb.c
[164/164] cmd.exe /C "cd . && "C:\Program Files\CMake\bin\cmake.exe" -E rm -f libSDL2d.a && C:\PROGRA~1\LLVM\bin\llvm-ar.exe qc libSDL2d.a #CMakeFiles\SDL2-static.rsp && cd ."
So I tried to install clang + cmake to compile a simple C++ program and I'm getting the following error:
-- The C compiler identification is GNU 4.8.3
-- The CXX compiler identification is Clang 3.5.0
-- 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
-- Check for working CXX compiler: /usr/local/bin/clang++
-- Check for working CXX compiler: /usr/local/bin/clang++ -- broken
CMake Error at /usr/share/cmake/Modules/CMakeTestCXXCompiler.cmake:54 (message):
The C++ compiler "/usr/local/bin/clang++" is not able to compile a simple
test program.
It fails with the following output:
Change Dir: /home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp
Run Build Command:/usr/bin/gmake "cmTryCompileExec697180971/fast"
/usr/bin/gmake -f CMakeFiles/cmTryCompileExec697180971.dir/build.make
CMakeFiles/cmTryCompileExec697180971.dir/build
gmake[1]: Entering directory
`/home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report
/home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp/CMakeFiles 1
Building CXX object
CMakeFiles/cmTryCompileExec697180971.dir/testCXXCompiler.cxx.o
/usr/local/bin/clang++ -o
CMakeFiles/cmTryCompileExec697180971.dir/testCXXCompiler.cxx.o -c
/home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
Linking CXX executable cmTryCompileExec697180971
/usr/bin/cmake -E cmake_link_script
CMakeFiles/cmTryCompileExec697180971.dir/link.txt --verbose=1
/usr/local/bin/clang++
CMakeFiles/cmTryCompileExec697180971.dir/testCXXCompiler.cxx.o -o
cmTryCompileExec697180971 -rdynamic
/usr/bin/ld: cannot find -lstdc++
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
gmake[1]: Leaving directory
`/home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTryCompileExec697180971] Error 1
gmake: *** [cmTryCompileExec697180971/fast] Error 2
It's not even compiling my program because it fails to compile a test program.
Looks like the important line is here:
/usr/bin/ld: cannot find -lstdc++
However, I have checked that libstdc++ is installed and up to date, so at this point I'm quite lost.
Other things I've tried:
Using prebuilt binaries instead of sudo yum install clang
remove and reinstall
Tried clang++ hello.cpp (hello world program). It says <iostreams> is not found. Is clang missing a standard library? EDIT: changing to <iostream> gives me the same linker error above.
I'm not familiar with the clang, cmake and C++ scene in general, so I'd appreciate any pointers. Thanks!
You need the development libraries and headers for C++ library, try
yum install libstdc++-devel
Your /home/gnu/bin/c++ seem to require additional flag to link things properly and CMake doesn't know about that.
To use /usr/bin/c++ as your compiler run cmake with -DCMAKE_CXX_COMPILER=/usr/bin/c++.
Also, CMAKE_PREFIX_PATH variable sets destination dir where your project' files should be installed. It has nothing to do with CMake installation prefix and CMake itself already know this.
I am trying to compile a c++ library g2o in cygwin(in windows 8) using cmake . I created a build folder and when I try to do cmake in that folder it fails with the following error
$ cmake ../
-- The C compiler identification is GNU 4.8.3
-- The CXX compiler identification is GNU 4.8.3
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- broken
CMake Error at /usr/share/cmake-2.8.11.2/Modules/CMakeTestCCompiler.cmake:61 (message):
The C compiler "/usr/bin/cc" is not able to compile a simple test program.
It fails with the following output:
Change Dir: /cygdrive/b/g2o/trunk/build/CMakeFiles/CMakeTmp
Run Build Command:/cygdrive/c/Program\
Files/MATLAB/R2009a/bin/win64/gmake.exe "cmTryCompileExec3795381385/fast"
C:/Program Files/MATLAB/R2009a/bin/win64/gmake -f
CMakeFiles/cmTryCompileExec3795381385.dir/build.make
CMakeFiles/cmTryCompileExec3795381385.dir/build
gmake[1]: Entering directory `B:/g2o/trunk/build/CMakeFiles/CMakeTmp'
/usr/bin/cmake.exe -E cmake_progress_report "/cygdrive/b/g2o/trunk/build/CMakeFiles/CMakeTmp/CMakeFiles" 1
Building C object
CMakeFiles/cmTryCompileExec3795381385.dir/testCCompiler.c.o
/usr/bin/cc -o CMakeFiles/cmTryCompileExec3795381385.dir/testCCompiler.c.o
-c "/cygdrive/b/g2o/trunk/build/CMakeFiles/CMakeTmp/testCCompiler.c"
Linking C executable cmTryCompileExec3795381385.exe
/usr/bin/cmake.exe -E cmake_link_script
CMakeFiles/cmTryCompileExec3795381385.dir/link.txt --verbose=1
gmake[1]: Leaving directory `B:/g2o/trunk/build/CMakeFiles/CMakeTmp'
process_begin: CreateProcess(NULL, /usr/bin/cmake.exe -E cmake_link_script
CMakeFiles/cmTryCompileExec3795381385.dir/link.txt --verbose=1, ...)
failed.
make (e=2): The system cannot find the file specified.
gmake[1]: *** [cmTryCompileExec3795381385.exe] Error 2
gmake: *** [cmTryCompileExec3795381385/fast] Error 2
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:4 (PROJECT)
-- Configuring incomplete, errors occurred!
The interesting thing here is I have cmake 3.0 installed in my machine and the error says cmake 2.8.11.2. I did a search in the pc and cannot find any folder by that name. The system path variable contains the path to correct cmake bin folder also.
I cannot figure out what could be the reason behind this error. Can it be an issue with the cygwin itself? What can I do to avoid this error?
One thing to note, Cygwin has its own copy of CMake, which is what your seeing as 2.8.11.2. That version has nothing to do with the one you have on your Windows machine. Have you tried to use the Windows installed version and not Cygwin?
I think the problem comes from not having all required compiler libraries installed in Cygwin. You could try creating a simple C++ file and try compiling it with gcc directly. If that fails, you've now found out why CMake is failing.
Unless there is a good reason to do so, you should probably consider NOT using Cygwin to run CMake inside Windows. CMake is very capable of producing Visual Studio project files.
The issue, at least for me, was the c compiler not accepting unix style paths.
The solution was to install gcc via cygwin. The packages I installed is gcc-base and gcc-cpp I believe.