[cairomm] No way to actually use cairomm after installation

[atimholt]

Describe the bug
After installing cairomm, no instructions are given for how to integrate it into a cmake project, and no files of the form '*cairomm*config.cmake' exist anywhere in the vcpkg directory.

Environment

• OS: Windows
• Compiler: Microsoft (R) Build Engine version 16.8.2+25e4d540b for .NET Framework

To Reproduce
Steps to reproduce the behavior:

1. ./vcpkg install cairomm
2. Manually try every capitalization and punctuation variation of the typical cmake commands, attempting to compile the project (with the 'cmake --build' command) every time.
3. Repeat step 2 after following the cmake-integration instructions for './vcpkg install cairo', for good measure.

Expected behavior
One should be able to follow instructions (currently absent), given at the end of the './vcpkg install cairomm' command, which will allow a project using the cairomm library to compile.

Failure logs
The following is typical output from the compiler (via the 'cmake --build build' command), whether or not the 'cairo' package (as opposed to the 'cairomm' package) is integrated into the cmake project, per the instructions given after './vcpkg install cairo'.

|| CMake is re-running because C:/[project_path]/build/CMakeFiles/generate.stamp is out-of-date.
|| the file 'C:/[project_path]/CMakeLists.txt'
|| is newer than 'C:/[project_path]/build/CMakeFiles/generate.stamp.depend'
|| result='-1'
|| -- Selecting Windows SDK version 10.0.18362.0 to target Windows 10.0.19042.
|| -- Configuring done
|| -- Generating done
|| -- Build files have been written to: C:/[project_path]/build
|| Microsoft (R) Build Engine version 16.8.2+25e4d540b for .NET Framework
|| Copyright (C) Microsoft Corporation. All rights reserved.
||
|| Checking Build System
|| main.obj : error LNK2001: unresolved external symbol "public: void __cdecl Cairo::Context::show_page(void)" (?show_page@Context@Cairo@@QEAAXXZ) [C:[project_path]\build\src\main.vcxproj]
|| main.obj : error LNK2001: unresolved external symbol "public: void __cdecl Cairo::Context::stroke(void)" (?stroke@Context@Cairo@@QEAAXXZ) [C:[project_path]\build\src\main.vcxproj]
|| main.obj : error LNK2001: unresolved external symbol "public: void __cdecl Cairo::Context::line_to(double,double)" (?line_to@Context@Cairo@@QEAAXNN@Z) [C:[project_path]\build\src\main.vcxproj]
|| main.obj : error LNK2001: unresolved external symbol "public: void __cdecl Cairo::Context::move_to(double,double)" (?move_to@Context@Cairo@@QEAAXNN@Z) [C:[project_path]\build\src\main.vcxproj]
|| main.obj : error LNK2001: unresolved external symbol "public: void __cdecl Cairo::Context::set_line_width(double)" (?set_line_width@Context@Cairo@@QEAAXN@Z) [C:[project_path]\build\src\main.vcxproj]
|| main.obj : error LNK2001: unresolved external symbol "public: void __cdecl Cairo::Context::set_source_rgb(double,double,double)" (?set_source_rgb@Context@Cairo@@QEAAXNNN@Z) [C:[project_path]\build\src\main.vcxproj]
|| main.obj : error LNK2001: unresolved external symbol "public: static class std::shared_ptr __cdecl Cairo::Context::create(class std::shared_ptr const &)" (?create@Context@Cairo@@sa?AV?$shared_ptr@VContext@Cairo@@@std@@aebv?$shared_ptr@VSurface@Cairo@@@4@@z) [C:[project_path]\build\src\main.vcxproj]
|| main.obj : error LNK2001: unresolved external symbol "public: static class std::shared_ptr __cdecl Cairo::SvgSurface::create(class std::basic_string<char,struct std::char_traits,class std::allocator >,double,double)" (?create@SvgSurface@Cairo@@sa?AV?$shared_ptr@VSvgSurface@Cairo@@@std@@v?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@4@NN@Z) [C:[project_path]\build\src\main.vcxproj]
|| C:[project_path]\build\src\Debug\main.exe : fatal error LNK1120: 8 unresolved externals [C:[project_path]\build\src\main.vcxproj]

Additional Context
The above linker failure output is given as illustrative that cairomm is not simply a header-only library, at the least.

[Neumann-A]

try out #13100

[NancyLi1013]

Hi @atimholt

Thanks for posting this issue.

Could you please try to build cairomm via this PR #13100?

[NancyLi1013]

Please update to latest vcpkg and rebuild this. Feel free to reopen this issue if it is still a problem for you.

[tueda]

Still vcpkg doesn't tell any clue on how to use cairomm in a CMake project. One has to figure it out somehow:

find_package(PkgConfig REQUIRED)
pkg_check_modules(CAIROMM REQUIRED IMPORTED_TARGET cairomm-1.16)

target_compile_features(main PRIVATE cxx_std_17)
target_link_libraries(main PRIVATE PkgConfig::CAIROMM)