This macro tries to determine the type of the date (1) command and some of its non-standard capabilities.
The type is determined as follow:
* If the version string contains "GNU", then: - The variable ax_cv_prog_date_gnu is set to "yes". - The variable ax_cv_prog_date_type is set to "gnu".
* If date supports the "-v 1d" option, then: - The variable ax_cv_prog_date_bsd is set to "yes". - The variable ax_cv_prog_date_type is set to "bsd".
* If both previous checks fail, then: - The variable ax_cv_prog_date_type is set to "unknown".
The following capabilities of GNU date are checked:
* If date supports the --date arg option, then: - The variable ax_cv_prog_date_gnu_date is set to "yes".
* If date supports the --utc arg option, then: - The variable ax_cv_prog_date_gnu_utc is set to "yes".
The following capabilities of BSD date are checked:
* If date supports the -v 1d option, then: - The variable ax_cv_prog_date_bsd_adjust is set to "yes".
* If date supports the -r arg option, then: - The variable ax_cv_prog_date_bsd_date is set to "yes".
All the aforementioned variables are set to "no" before a check is performed.
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Copyright © 2017 Enrico M. Crisostomo email@example.com
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