gprconfig crashes with ENCODING_ERROR when environment variables contain non-ASCII characters

[santiagomfo]

Description

gprconfig crashes with ADA.STRINGS.UTF_ENCODING.ENCODING_ERROR when Windows environment variables contain non-ASCII (UTF-8) characters.

Environment

• OS: Windows 11 (or your version)
• gprbuild version: 25.0.1
• Alire version: 2.1.0

Steps to Reproduce

1. Have a Windows environment variable with non-ASCII characters
   (e.g., OneDrive=C:\Users\user\OneDrive - Politécnica)
2. Run any Alire/gprbuild command: alr clean or gprconfig --config ada

Expected Behavior

The command should execute normally, handling UTF-8 encoded paths.

Actual Behavior

Crash with stack trace:

Unrecoverable error in GPRconfig: raised ADA.STRINGS.UTF_ENCODING.ENCODING_ERROR : bad input at Item (50)

Workaround

Clearing the problematic environment variables before running:

set OneDrive=
set OneDriveCommercial=

[Jicquel]

Hi @Santiago-Murillo, thank you for your report, I managed to reproduced the issue.

From my initial investigation:

To obtain environment variables, the GPR2 tools, such as gprconfig, rely on GPR2.Environment, which in most cases relies on Ada.Environment. Ada.Environment uses the C getenv function, which returns values encoded according to the current locale.

The retrieved environment values are eventually passed to GNATCOLL’s Set_Variables subprogram, which expects UTF-8–encoded values. Therefore, if the locale is not UTF-8–compliant, the decoding fails.

We will update the issue as progress is made.