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When using gnatmake with project files, if there exists a file gnat.adc that contains configuration pragmas, this file will be ignored.
Configuration pragmas can be defined by means of the following attributes in
project files: Global_Configuration_Pragmas in package Builder
and Local_Configuration_Pragmas in package Compiler.
Both these attributes are single string attributes. Their values is the path name of a file containing configuration pragmas. If a path name is relative, then it is relative to the project directory of the project file where the attribute is defined.
When compiling a source, the configuration pragmas used are, in order,
those listed in the file designated by attribute
Global_Configuration_Pragmas in package Builder of the main
project file, if it is specified, and those listed in the file designated by
attribute Local_Configuration_Pragmas in package Compiler of
the project file of the source, if it exists.