Including cpr in CMakeLists.txt causes linker errors in another library on Windows

[sentientbottleofwine]

Description

I don't really know if I should report this here or in the library that gets broken but with the following CMakeLists.txt:

cmake_minimum_required(VERSION 3.25)
set(CMAKE_CXX_STANDARD 20)
include(FetchContent)

FetchContent_Declare(cpr 
	GIT_REPOSITORY 	https://github.com/libcpr/cpr.git
	GIT_TAG 	dec9422db3af470641f8b0d90e4b451c4daebf64
)

FetchContent_Declare(keychain
	GIT_REPOSITORY 	https://github.com/hrantzsch/keychain
	GIT_TAG        	82acee89623d0d84e1575147fb83ed387646bce8 
)

FetchContent_MakeAvailable(cpr keychain)

project(foo)

add_executable(foo
	main.cpp
)

target_link_libraries(foo
        PRIVATE keychain
	PRIVATE cpr::cpr
)

And main.cpp:

#include <cpr/cpr.h>
#include <keychain/keychain.h>

int main() {
    // The code isn't that important it's just for the functions to be linked to the executable
    cpr::Response r = cpr::Get( cpr::Url{"https://example.com"} );
    keychain::Error err;
    keychain::setPassword("dasd", "asdasda", "dasdasd", "asd", err);
}

The build breaks and throws out linker errors that reference keychain. This only happens when I include cpr. Other libs work fine. There is one weird thing, when I switch the order in FetchContent_MakeAvailable():

FetchContent_MakeAvailable(keychain cpr)

The build works.
Logs of failed build:
https://pastebin.com/iKSpKjqq
https://pastebin.com/L75nGhHx

Logs of successful build(with switched order):
https://pastebin.com/28f7taQP
https://pastebin.com/mQfsw97a
On linux everything works no matter the order. I'm using clang + msvc(as stdlib) + ninja.

Example/How to Reproduce

• On a windows setup with clang + msvc + ninja(I used this guide , it's just downloading clang and ninja).
• Create files CMakeLists.txt and main.cpp with the contents specified above.
• Run

cmake . -G Ninja -B build
cmake --build build/

• Observe linker error occurring based on CMakeLists.txt

Possible Fix

No response

Where did you get it from?

GitHub (branch e.g. master)

Additional Context/Your Environment

• OS: Windows
• Version: 11

[COM8]

@sentientbottleofwine thanks for reporting and this well written issue!

I had a quick look at it and it looks like it's a Windows only issue. I tested it on Fedora (Silverblue) 41 and there both orders work.

I suspect there are actually missing includes in the keychain source code and it most likely is not directly related to cpr.

[sentientbottleofwine]

@COM8 I'm not sure if I understand you correctly but building keychain alone works fine(altough I had to remove the build directory and rerun cmake . -G Ninja -B build, probably because of some caching issues). I don't know how that would be caused by missing includes if one order works fine, could you elaborate?