2019-07-03  Arnaud Charlet  <charlet@adacore.com>

gcc/ada/

	* bindgen.adb (Gen_Main): Disable generation of reference to
	Ada_Main_Program_Name for CCG.
	* bindusg.adb (Display): Add -G to the command-line usage for
	gnatbind.
	* opt.ads (Generate_C_Code): Update comment.
	* switch-b.adb (Scan_Binder_Switches): Add handling for -G.

From-SVN: r272965