Experimental Physics and
Industrial Control System

Dirk Zimoch via Core-talk <core-talk at aps.anl.gov> · Mon, 01 Feb 2021 15:50:52 -0000

Concerning _GNU_SOURCE, this is what gnu.org has to say about this:

"You should define these macros by using ‘#define’ preprocessor directives at the top of your source code files. These directives must come before any #include of a system header file. It is best to make them the very first thing in the file, preceded only by comments. You could also use the ‘-D’ option to GCC, but it’s better if you make the source files indicate their own meaning in a self-contained way."

So better put it in the source files, not in the Makefile.
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System