FLAG is appended to the FLAGS-VARIABLE shell variable, with a space added in between.
If FLAGS-VARIABLE is not specified, the current language’s flags (e.g. CFLAGS) is used. FLAGS-VARIABLE is not changed if it already contains FLAG. If FLAGS-VARIABLE is unset in the shell, it is set to exactly FLAG.
NOTE: Implementation based on AX_CFLAGS_GCC_OPTION.
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Copyright © 2008 Guido U. Draheim email@example.com
Copyright © 2011 Maarten Bosmans firstname.lastname@example.org
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