Found CppAD version '' but at least version '20200000.1' is required

[sampotter]

Attempting to install CppAD and CppADCodeGen using CMake 3.18.4 on macOS 10.15.6 and running into some issues.

First, I clone the master branch of CppAD, and run:

cd CppAD
mkdir build
cd build
cmake ..
make
sudo make install

Everything runs fine, no issues.

Next, I clone the master branch of CppADCodeGen, and run:

cp CppADCodeGen
mkdir build
cd build
cmake ..

and get the error:

CMake Error at cmake/FindCppAD.cmake:99 (MESSAGE):
  Found CppAD version '' but at least version '20200000.1' is required
Call Stack (most recent call first):
  CMakeLists.txt:42 (FIND_PACKAGE)

Following the instructions here I run grep '^SET(cppad_version' CMakeLists.txt and get:

SET(cppad_version "20200905")

Evidently the version is high enough but it isn't getting pulled in by FindCppAD.cmake.

Let me know if I made some mistake in the above. I would expect this approach to "just work"... Thanks.

[joaoleal]

Hello,

That version has a different version format since it does not have the X in "YYYYMMDD.X".
CppADCodeGen uses regular expressions to extract the version information from the installed file (CMakeLists.txt is not installed):
/usr/local/include/cppad/configure.hpp

I'll update the regular expressions to be more flexible.

[joaoleal]

Note that this issue would not happen with the CppAD releases since they follow the format "YYYYMMDD.X".

[sampotter]

Thanks. Makes sense. I figured it was something like this. Please update when you've fixed this issue. I'll try with the releases in the meantime.

[joaoleal]

It is in master and develop branches.

[sampotter]

That fixes the problem, thanks.