I can't get Code Blocks IDE to compile the hello world C program it creates when you create a new C project. I've installed MinGW and it was recognised by the IDE. But when I try to build I get the following output:
--------------Build:Debug in TestC3(compiler: GNU GCC Compiler)--------------- mingw32-gcc.exe -Wall-g -c C:\Users\jody\codeblocks\testc3\TestC3\main.c -o obj\Debug\main.o mingw32-g++.exe -o bin\Debug\TestC3.exe obj\Debug\main.o Execution of 'mingw32-g++.exe -o bin\Debug\TestC3.exe obj\Debug\main.o' in 'C:\Users\jody\codeblocks\testc3\TestC3' failed.
Why is it trying to run mingw32-g++.exe as well as mingw32-gcc.exe? (And if it shouldn't be doing this, how can I configure it not to?)
The mingw32-gcc.exe step is the compile step. The mingw32-g++.exe is the link step. This is the correct sequence and will work if your mingw32 installation is "normal" and correct - where "normal" means you have installed the C++ as well as the C tools.
The link step is failing for you because mingw32-g++.exe cannot be executed, most likely because it does not exist on your PATH. Try running mingw32-g++.exe at the command prompt to check. Look in the directory where mingw32-gcc.exe resides to see if mingw32-g++.exe is also there.
If your mingw32 installation has got broken somehow I suggest you uninstall and reinstall.
If you have intentionally installed only the C tools then that will explain what you are seeing, and it is easily fixed:
Both mingw32-gcc.exe and mingw32-g++.exe are just tool driver programs. When invoked with compilation options for .c files, mingw32-gcc.exe invokes the C compiler. When invoked with compilation options for .cpp|cxx|... files, mingw32-g++.exe invokes the C++ compiler. If either of them is invoked with linkage options then it invokes the linker.
Codeblocks by default configures mingw32-g++.exe to invoke the linker because it will do equally well for C projects, C++ projects and C/C++ projects, and it assumes you have the full C/C++ toolchain.
If you have not installed C++ tools and only want to build C, then you can use mingw32-gcc.exe to invoke both the C compiler and the linker. To configure this in the CodeBlocks IDE:
Navigate Settings -> Compiler
Ensure that the Selected Compiler is GNU GCC
Tab to Toolchain executables
Change Linker for dynamic libs from mingw32-g++.exe to mingw32-gcc.exe