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A new switch is added to gnatmake: --single-compile-per-obj-dir. When this switch is used and project files are used, gnatmake will not spawn more that one compilation for the same object directory, even if switch -jnn would allow for a larger number of simultaneous compilations. The test for this is to invoke gnatmake on a project file with many sources that does not import other project files and with switches -j8 and --single-compile-per-obj-dir: there should not be several simultaneous compilation processes. Tested on x86_64-pc-linux-gnu, committed on trunk 2010-09-09 Vincent Celier <celier@adacore.com> * make.adb (Queue): New package implementing a new impementation of the queue, taking into account the new switch --single-compile-per-obj-dir. * makeutl.ads (Single_Compile_Per_Obj_Dir_Switch): New constant String for gnatmake and gprbuild new switch --single-compile-per-obj-dir. * opt.ads (One_Compilation_Per_Obj_Dir): New Boolean flag, defauted to False. * switch-m.adb (Scan_Make_Switches): Take into account new gnatmake switch --single-compile-per-obj-dir. * vms_data.ads: Add qualifier SINGLE_COMPILE_PER_OBJ_DIR for gnatmake switch --single-compile-per-obj-dir. * gnat_ugn.texi: Add documentation for new gnatmake switch --single-compile-per-obj-dir.
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