Some "url" attributes causes cmake-conan to fail

[rollebolle]

Having some special characters in the URL attribute in a conanfile.py may cause conan_provider.cmake to fail (see error message below). In my case it was a "?" and a "=" that generated this error. Selected generators was CMakeDeps but dont think it matters

CMake Error at /srv/rolwal/repos/sync-product/cmake/conan_provider.cmake:476 (string):
  string sub-command JSON failed parsing json string: * Line 1492, Column 24

    Syntax error: value, object or array expected.

  .
Call Stack (most recent call first):
  /srv/rolwal/repos/sync-product/cmake/conan_provider.cmake:578 (conan_install)
  CMakeLists.txt:60 (find_package)

[memsharded]

Hi @rollebolle

I have tried to reproduce this without success. What I did:

• Use a conan new cmake_lib -d name=pkg -d version=0.1 dependency
• Change the url attribute to contain ?=
• Created the package pkg/0.1
• Used the dependency pkg/0.1 in this repo example conanfile.txt
• Use the provider
• Everything went well

I am using Windows 11, CMake 3.25.3, VS 2022 17.1
Profile:

arch=x86_64
build_type=Release
compiler=msvc
compiler.cppstd=14
compiler.runtime=dynamic
compiler.runtime_type=Release
compiler.version=194
os=Windows

Latest Conan 2.4.1

[rollebolle]

After examining what part of our URL that actually triggered this, I tried it in the example project in this repo, using a conanfile with the URL below. This gave me the error I described. Conan 2.4.1

url = "foo;a=p"

[memsharded]

Thanks for the hints, I managed to reproduce, and the final offender was the ; semicolon, because CMake uses them as separators 🤦

I am doing #652 to fix it, thanks again for the feedback!