On my pc I have compiler gcc (x86_64-posix-seh-rev0, Built by MinGW-W64 project) 8.1.0.
I would like to compile gstreamer source code, where is meson.build.
In meson.build, there is line:
cc = meson.get_compiler('c')
In user's path I set CC to gcc. When I start meson using command:
meson /path/to/directory I see that meson select gcc (gcc 8.1.0 "gcc (i686-posix-dwarf-rev0, Built by MinGW-W64 project) 8.1.0"). How can I change that?
I tried cc=gcc too.
My cpu is AMD 64bit.
Related
I am trying to build a project from cmake on CentOS 7. The project requires C++ 17 and I'm getting this error from the build:
CMake Error at nvbench/nvbench/CMakeLists.txt:86 (target_compile_features):
target_compile_features The compiler feature "cxx_std_17" is not known to
CXX compiler
"GNU"
version 4.8.5.
L86:
target_compile_features(nvbench PUBLIC cuda_std_17 PRIVATE cxx_std_17)
Naturally, CentOS 7's g++ has version 4.8.5 and doesn't support C++ 17, but I have devtoolset 9 which has g++ version 9.3.1. I've added these lines near the top CMakeLists.txt:
set(CMAKE_C_COMPILER /opt/rh/devtoolset-9/root/bin/gcc)
set(CMAKE_CXX_COMPILER /opt/rh/devtoolset-9/root/bin/g++)
but cmake still references the default compiler and not the one in the devtoolset.
Also made sure to run with scl enable devtoolset-9 'cmake ..' but that didn't work either.
How can I fix this so cmake uses g++ in the devtooset?
After a very long and lengthy process of trying to get Emscripten going. I'm stuck trying to build fastcomp.
cmake .. -DCMAKE_BUILD_TYPE=Release
-DLLVM_TARGETS_TO_BUILD="X86;JSBackend" -DLLVM_INCLUDE_EXAMPLES=OFF -DLLVM_INCLUDE_TESTS=OFF -DCLANG_INCLUDE_TESTS=OFF
It gives this error:
CMake Error at cmake/modules/CheckCompilerVersion.cmake:12 (message):
Host GCC version must be at least 4.8!
I've installed devtools 2 and actiavted the toolset.
gcc --version reads as using gcc 4.8.2, but it just won't go.
I've also tried:
export CC=/opt/rh/devtoolset-2/root/usr/bin/gcc
export CXX=/opt/rh/devtoolset-2/root/usr/bin/c++
export CPP=/opt/rh/devtoolset-2/root/usr/bin/cpp
What am I doing wrong?
I had this same problem until I recompiled a recent version of cmake with the newer version of gcc already "activated".
Then, with the CC, CXX and CPP environment variables also set to the appropriate paths, cmake then stopped giving that "Host GCC version must be at least 4.8!" error.
I'm using Ubuntu 16.04 x86_64 and LLVM 5.0 and would like to compile a project to a single LLVM IR bitcode file using CMake. I know there is a way to do this using the GOLD Linker with the LLVM Plugin and add the CMake linker flags "-fuse-ld=gold -Wl,-plugin-opt=emit-llvm" and the CXX flag "-flto".
But when I try to compile the project with the LLVM LLD linker and the "-fuse-ld=lld -Wl,-plugin-opt=emit-llvm" respectively "-flto" Flag, the linker is generating a native executable and no LLVM IR file. I was searching for other LLD options to emit a LLVM IR file but found nothing.
Is there a way (or option) to generate a single LLVM IR file using LLD?
You can use the -save-temps option.
clang -flto -fuse-ld=lld -Wl,-save-temps a.o b.o -o myprogram
This will generate myprogramXYZ.precodegen.bc among other files. You can then use llvm-dis to get it in readable IR format.
Firstly, I have installed MinGW from https://sourceforge.net/projects/mingw/files/ and the mingw32-gcc-g++ and mingw32-gcc-objs with it. I have added C:\MinGW\bin to my path.
Secondly, I have installed Git for windows (not really important, the result is the same on cmd.exe).
Thirdly, I have installed the complete package "make" with http://gnuwin32.sourceforge.net/packages/make.htm
After that, I have installed cmake 3.5.1 with the .msi.
But when I run cmake ../src the result is :
-- The C compiler identification is unknown
-- The CXX compiler identification is unknown
CMake Error at CMakeLists.txt:5 (project):
No CMAKE_C_COMPILER could be found.
CMake Error at CMakeLists.txt:5 (project):
No CMAKE_CXX_COMPILER could be found.
-- Configuring incomplete, errors occurred!
See also "C:/Users/pauka/Dropbox/ETUDE/SRI/S8/STA_Stage/sources/tests/bin/CMakeFiles/CMakeOutput.log".
See also "C:/Users/pauka/Dropbox/ETUDE/SRI/S8/STA_Stage/sources/tests/bin/CMakeFiles/CMakeError.log".
So cmake can't find gcc or g++. But when I run gcc -version, the output is good... What should I configure for cmake ?
My CMakeLists.txt is :
# Ajustez en fonction de votre version de CMake
cmake_minimum_required (VERSION 2.8)
# Nom du projet
project (main)
find_package (OpenCV REQUIRED)
# Exécutable "main", compilé à partir du fichier main.cpp
add_executable (tracking_color tracking_color.cpp)
add_executable (feuille feuille.cpp)
add_executable (detect_circles detect_circles.cpp)
add_executable (segmentation segmentation.cpp)
add_executable (watershed_perso watershed_perso.cpp)
add_executable (main main.cpp utils.h)
add_executable (info_coins info_coins.cpp)
# main sera linké avec les bibliothèques d'OpenCV
target_link_libraries (tracking_color ${OpenCV_LIBS})
target_link_libraries (feuille ${OpenCV_LIBS})
target_link_libraries (detect_circles ${OpenCV_LIBS})
target_link_libraries (segmentation ${OpenCV_LIBS})
target_link_libraries (watershed_perso ${OpenCV_LIBS})
target_link_libraries (info_coins ${OpenCV_LIBS})
target_link_libraries (main ${OpenCV_LIBS})
Ok, shame on me,
I had to restart my computer and select "MinGW Makefiles" in the CMake GUI. Click Configure, and after that Generate.
Next, you must not use Git for windows because there is sh.exe and it's a cmake bug.
PS: to use OpenCV, you must compile it :
cd C:\opencv
mkdir my_build
cd my_build
cmake -G "MinGW Makefiles" ../sources
mingw32-make # took 2 hours on my computer
and next add, C:\opencv\my_build and C:\opencv\my_build\bin to the system path.
You can try setting manually the cxx path, see CMAKE_C_COMPILER from link which tells you more or less link this:
CXX=C:\path\to\g++ cmake ..
But, I would recommend you to see why cmake doesn't recognize your cxx compiler. I would double check your environment paths.
Maybe not the best answer but get things going. Install Bash On Ubuntu On Windows and install cmake and make using sudo apt-get install cmake and sudo apt-get install build-essential if you don't already have them installed. However, Bash On Ubuntu On Windows only comes with Windows 10 and for accessing a specific drive you should use /mnt/c instead of C:\
Follow this official tutorial to install Bash On Ubuntu On Windows.
mona#DESKTOP-0JQ770H:/mnt/c$ cmake -version
cmake version 2.8.12.2
mona#DESKTOP-0JQ770H:/mnt/c$ make -version
GNU Make 3.81
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
This program built for x86_64-pc-linux-gnu
Additionally, of course you can install git in Bash On Ubuntu On Windows
sudo apt-get install git
mona#DESKTOP-0JQ770H:/mnt/c$ git --version
git version 1.9.1
though I don't suggest using a Linux-based git for pushing to github for a Windows specific SDK/code. I would still stick to Git Bash for dealing with git.
*I used to use CMAKE GUI for dealing with CMake in Windows 10 and then port my stuff to Visual Studio. That is also a neat solution depending on your codebase.
I want to generate a dll file in MinGW, I have several object dependencies in order to do that, one of my object dependencies is libdl.so, I add this object in unix simply as :
g++ xx.o yy.o /usr/lib/libdl.so -o module.so
but in MinGW, I don't have any idea how to add this object. any ideas?
There is a MinGW port of libdl that you can use just like under Unix. Quote from the website:
This library implements a wrapper for dlfcn, as specified in POSIX and SUS, around the dynamic link library functions found in the Windows API.
It requires MinGW to build.
You may get pre-built binaries (with MinGW gcc 3.4.5) and a bundled source code from the Downloads section.
The following commands build and install it in a standard MinGW installation (to be run from your MinGW shell):
./configure --prefix=/ --libdir=/lib --incdir=/include && make && make install
To compile your library as a DLL, use the following command:
g++ -shared xx.o yy.o -ldl -o module.dll
I encountered the same problem (msys2, 32bit version of compiler etc.).
For me I found out that the libdl.a was available in /usr/lib but not in /mingw32/lib. I was able to solve the problem by linking it to the /mingw32/lib folder:
ln -s /usr/lib/libdl.a /mingw32/lib