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Fix the internal compiler error with gcc 12/13 and CUDA 12.4/12.5 #2282

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@diehlpk diehlpk commented Jan 8, 2025

Summary

Compiling qiskit-aer with CUDA support and gcc 12/13 resulted in some internal compiler error, see #2227.

The error was resolved by removing the const expression in from of the lambda functions. The issue is that the above const declared variables are passed to the lambda function using & as the default capture of the lambda function. Passing a constant value by reference to a lambda function causes issues by gcc 12/13.

Details and comments

Removing the const expression allows the code to compile with gcc 12/13 using CUDA 12.4/12.5. I have not yet checked if the issue us specific to Grace Grace and Grace Hopper which is ARM.

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