JuniorTheoryCommon

What happens when these files are built with the command `clang++ main.cpp`?

C++

// triple.h
int triple(int x);

// triple.cpp
#include "triple.h"
int triple(int x) { return x * 3; }

// main.cpp
#include "triple.h"
int main() { return triple(14); }

Link error: nothing in this build defines triple

Expecting #include "triple.h" to bring in triple.cpp: it pastes only the header's text, and triple.cpp is compiled only when the build command names it.
Expecting a compiler error: the declaration from triple.h is enough to compile the call; only the linker looks for the body of triple.

Which command builds these files into one working program?
How does the build system CMake help keep a source file from being left out?

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JuniorTheoryCommon

What happens when these files are built with the command `clang++ main.cpp`?

C++

// triple.h
int triple(int x);

// triple.cpp
#include "triple.h"
int triple(int x) { return x * 3; }

// main.cpp
#include "triple.h"
int main() { return triple(14); }

Link error: nothing in this build defines triple

Expecting #include "triple.h" to bring in triple.cpp: it pastes only the header's text, and triple.cpp is compiled only when the build command names it.
Expecting a compiler error: the declaration from triple.h is enough to compile the call; only the linker looks for the body of triple.

Which command builds these files into one working program?
How does the build system CMake help keep a source file from being left out?

Back to questions Open topic in roadmap →Answer it yourself — Quiz

What happens when these files are built with the command clang++ main.cpp?

What happens when these files are built with the command clang++ main.cpp?

What happens when these files are built with the command `clang++ main.cpp`?

What happens when these files are built with the command `clang++ main.cpp`?