"math cannot parse the expression" Error in Reprojucer when configuring a project

[JoseDiazRohena]

Hi! I'm excited to get this working but have run into some issues.

I configured and built FRUT as instructed in "getting started". I was able to
successfully create a cmakelist.txt for my project, but configuring with
cmake .. G Xcode fails with the following error:

CMake Error at ~/ToteBag/Third Party/FRUT/prefix/FRUT/cmake/Reprojucer.cmake:6749 (math):
  math cannot parse the expression: "(1 << 16) + (0 << 8) + 0r1": syntax
  error, unexpected exp_NUMBER, expecting end of file (26).
Call Stack (most recent call first):
  ~/ToteBag/Third Party/FRUT/prefix/FRUT/cmake/Reprojucer.cmake:4653 (_FRUT_version_to_dec)
  ~/ToteBag/Third Party/FRUT/prefix/FRUT/cmake/Reprojucer.cmake:2671 (_FRUT_generate_plist_file)
  CMakeLists.txt:352 (jucer_project_end)
  

I'm using Xcode 14.2 and Cmake 3.25.1

[JoseDiazRohena]

I think this may be due to an out of date cmake on my part.

[JoseDiazRohena]

Wait. I think there is an issue in the docs. It says that "Reprojucer.cmake requires CMake version 3.4 minimum." However, the latest version of cmake I can find is 3.25.1, See: https://cmake.org/download/

[McMartin]

Hi @JoseDiazRohena,

Thanks for using FRUT!

FRUT indeed requires CMake 3.4 (which was released in November 2015), or a later version. The last version of CMake (3.25.1 as you found out) should work fine, though I haven't tested personally.

Based on the CMake error you shared above, Reproducer.cmake is trying to convert the version of your project (1.0.0r1) into an integer, by splitting on periods and using bit shifting. Unfortunately, 0r1 is not a valid number that can be bit shifted.

Does Projucer really accept a project version like 1.0.0r1? If it does, then you found a bug in Reprojucer.cmake, since it should reproduce how Projucer works. I'll have a look on my side to see what Projucer's behavior is.

I hope this helps!

[McMartin]

It seems that Projucer is fine with non-integers values in the project version because it uses juce::String::getIntValue, which returns the first integer in the string and ignores anything afterwards. This means that 0r1 is treated like 0 and the math expression (that contains the bit shifting) works fine.

As I wrote above, you found a bug in Reprojucer.cmake. Thanks for finding it and opening that issue!

I'll take care of fixing it as soon as I can.

[JoseDiazRohena]

Ah! I'm glad to have helped 🫡.