EDIT Since not so recently by now, MinGW-w64 has “absorbed” one of the toolchain building projects. The downloads can be found here. The installer should work, and allow you to pick a version that you need. Note the Qt SDK comes with the same toolchain. So if you are developing in Qt and using the … Read more
Update: Often people want the most recent version of gcc, and devtoolset is being kept up-to-date, so maybe you want devtoolset-N where N={4,5,6,7…}, check yum for the latest available on your system). Updated the cmds below for N=7. There is a package for gcc-7.2.1 for devtoolset-7 as an example. First you need to enable the … Read more
With gcc but also other compilers (e.g. clang), the order of linker command arguments does matter. As a rule of thumb, I would use the following order when composing the linker command: Object files (*.o) Static libraries (*.a) Shared libraries (*.so) The order of shared libraries does matter as well. If libfoo.so depends on libbar.so, … Read more
Warning: dangerous and ugly hack. Close your eyes now You can hook your own preprocessor by adding the ‘-no-integrated-cpp’ and ‘-B’ switches to the gcc command line. ‘-no-integrated-cpp’ means that gcc does search in the ‘-B’ path for its preprocessors before it uses its internal search path. The invocations of the preprocessor can be identified … Read more
If you need that code to work portable then you should cast the argument to unsigned int, as the int type may have a different size than Int32 on some platforms. To answer your question about disabling specific warnings in GCC, you can enable specific warnings in GCC with -Wxxxx and disable them with -Wno-xxxx. … Read more
The Threads module in the latest versions (>= 3.1) of CMake generates the Threads::Threads imported target. Linking your target against Threads::Threads adds all the necessary compilation and linking flags. It can be done like this: set(CMAKE_THREAD_PREFER_PTHREAD TRUE) set(THREADS_PREFER_PTHREAD_FLAG TRUE) find_package(Threads REQUIRED) add_executable(test test.cpp) target_link_libraries(test Threads::Threads) Use of the imported target is highly recommended for new … Read more
It looks like you are most of the way there already. Well done with your investigation. Let’s see if I can help clear up the ‘why’ behind it. Here’s what the linker is doing. When you link your executable (‘main’ above) it has some symbols (functions and other things) that are unresolved. It will look … Read more
This is not a compiler error, it is a preprocessor error. It occurs when the preprocessor encounters invalid syntax while trying to evaluate an expression in a #if or #elif directive. One common cause is the sizeof operator in an #if directive: For example: #define NBITS (sizeof(TYPE)*8) //later #if (NBITS>16) //ERROR This is an error … Read more
You should not override the compiler for this purpose. If you really need to compile your C files as C++ then you should teach cmake that your files belong to C++ language: set_source_files_properties(filename.c PROPERTIES LANGUAGE CXX )