Include c++ header in all cpp files from cmake

Question

Is there any way to include a header (.hpp) in all cpp files from a project (automatic)?

The project is compiled using cmake.

Forcefully including something in TU is naughty. Why do you even want to do that? I suspect this is an [XY problem](https://meta.stackexchange.com/questions/66377/what-is-the-xy-problem). — StoryTeller - Unslander Monica, Nov 16 '17 at 12:06
Big project with lots of files (c++ and c) and I would like to add some common functions in all of them — CrSe, Nov 16 '17 at 12:09
Sounds like you want to "force include" files, but as far as I know there is not direct support for this in CMake. So do you need this to be cross-platform or would it be enough to have it for GNU or VS compilers? — Florian, Nov 16 '17 at 12:12
you are planning to also add calls to that functions in an automated manner? really quite unclear why you would need that. — 463035818_is_not_a_number, Nov 16 '17 at 12:19
@CrSe - Is that it? You just need to link a TU that replaces them once. No need to force include anything. — StoryTeller - Unslander Monica, Nov 16 '17 at 12:27
[What is the XY problem?](https://meta.stackexchange.com/questions/66377/what-is-the-xy-problem) — 463035818_is_not_a_number, Nov 16 '17 at 12:30
[\[new.delete\]](https://timsong-cpp.github.io/cppwp/n4659/new.delete), from the C++ standard itself. Notice how it says *"A C++ program may define functions with either of these function signatures, and thereby displace the default versions defined by the C++ standard library."* The replacement is global across the entire program. — StoryTeller - Unslander Monica, Nov 16 '17 at 12:39

score 0 · Answer 1 · answered Nov 16 '17 at 12:15

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You can use pre-compiled headers to that. Cross-compile implementation of that for CMake is not very easy, so, I recommend 3rd party module for that, for example CMakePCHCompiler

answered Nov 16 '17 at 12:15

knst

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Include c++ header in all cpp files from cmake

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