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This patch implements pragma Ada_2012 (pragma Ada_12 allowed as a synonym) and switch -gnat12 to activate Ada 2012 mode. Already implemented Ada_2012 features have been placed under control of this switch. The effect of -gnatX and pragma Extensions_Allowed (On) has been modified to set the latest Ada version to minimize compatibility issues. The patch also adds -gnat2005 and -gnat2012 as synonyms for -gnat05/12. The following compiles clean with this patch pragma Ada_2012; function Ada12test (X : Boolean) return Integer is begin return (if X then 2 else 42); end Ada12test; Tested on x86_64-pc-linux-gnu, committed on trunk 2010-06-23 Robert Dewar <dewar@adacore.com> * usage.adb: Add documentation for -gnat12 switch. * errout.ads: Add VMS alias entry for -gnat12 switch * gnat_rm.texi: Add documentation for pragma Ada_12 and Ada_2012 Add documentation for pragma Extensions_Allowed. * opt.ads: Add entry for Ada 2012 mode. * sem_ch4.adb, par-ch3.adb, par-ch4.adb: Use new Ada 2012 mode for 2012 features. * sem_prag.adb, par-prag.adb: Add processing for pragma Ada_12 and Ada_2012. * sem_ch13.adb: Add handling for Ada 2012 mode. * snames.ads-tmpl: Add entries for pragma Ada_2012 and Ada_12. * switch-c.adb: Add handling for -gnat12 switch. Implement -gnat2005 and -gnat2012. * usage.adb: Add documentation for -gnat12 switch. * vms_data.ads: Add /12 switch for Ada 2012 mode.
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