[RTEMS Project] #4080: build: Add start.o dependency to the executable link step

[RTEMS trac]

#4080: build: Add start.o dependency to the executable link step
------------------------------+-----------------------------
  Reporter:  Sebastian Huber  |      Owner:  Sebastian Huber
      Type:  enhancement      |     Status:  assigned
  Priority:  normal           |  Milestone:  6.1
 Component:  build            |    Version:  6
  Severity:  normal           |   Keywords:
Blocked By:                   |   Blocking:
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 RTEMS is a real-time operating system and the applications using RTEMS end
 up in a single executable which contains also the full system
 initialization.  The linker uses a start file to determine what should be
 linked into the executable. The start file is also built by the build
 system, however, it is only indirectly referenced via a linker script, for
 example:

 https://git.rtems.org/rtems/tree/bsps/arm/shared/start/linkcmds.base#n28

 So, every executable depends on the start file (start.o usually). If
 start.o changes, then the executable needs to be re-linked. Also the start
 file needs the name expected by the linker script, for example not
 start.S.17.o.

 The start files are build with this commands:

 https://git.rtems.org/rtems/tree/wscript#n535

 https://git.rtems.org/rtems/tree/wscript#n244

 Somehow we have to add a dependency on start.o to every executable.

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Ticket URL: <http://devel.rtems.org/ticket/4080>
RTEMS Project <http://www.rtems.org/>
RTEMS Project