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A speciality of the RTEMS build system was the make preinstall step. It
copied header files from arbitrary locations into the build tree. The
header files were included via the -Bsome/build/tree/path GCC command
line option.
This has at least seven problems:
* The make preinstall step itself needs time and disk space.
* Errors in header files show up in the build tree copy. This makes it
hard for editors to open the right file to fix the error.
* There is no clear relationship between source and build tree header
files. This makes an audit of the build process difficult.
* The visibility of all header files in the build tree makes it
difficult to enforce API barriers. For example it is discouraged to
use BSP-specifics in the cpukit.
* An introduction of a new build system is difficult.
* Include paths specified by the -B option are system headers. This
may suppress warnings.
* The parallel build had sporadic failures on some hosts.
This patch removes the make preinstall step. All installed header
files are moved to dedicated include directories in the source tree.
Let @RTEMS_CPU@ be the target architecture, e.g. arm, powerpc, sparc,
etc. Let @RTEMS_BSP_FAMILIY@ be a BSP family base directory, e.g.
erc32, imx, qoriq, etc.
The new cpukit include directories are:
* cpukit/include
* cpukit/score/cpu/@RTEMS_CPU@/include
* cpukit/libnetworking
The new BSP include directories are:
* bsps/include
* bsps/@RTEMS_CPU@/include
* bsps/@RTEMS_CPU@/@RTEMS_BSP_FAMILIY@/include
There are build tree include directories for generated files.
The include directory order favours the most general header file, e.g.
it is not possible to override general header files via the include path
order.
The "bootstrap -p" option was removed. The new "bootstrap -H" option
should be used to regenerate the "headers.am" files.
Update #3254.
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This bsp_specs included non-standard logic to pass endian arguments
to the linker. These should not be necessary. If they are, it is a
bug in the sh gcc target. The code was "%{ml:-EL}%{mb:-EB}"
Also the file linkcmds.sim was not referenced and was deleted.
Updates #3250.
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* bsp_specs: Move -e start from *link to *startfile to avoid warning
for undefined entry symbol when linking relocatables with binutils
2.19.
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* bsp_specs: Remove qrtems_debug.
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* bsp_specs: Remove *lib:.
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* bsp_specs: Remove -D__embedded__ -Asystem(embedded) from cpp.
Remove cpp, old_cpp (now unused).
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* bsp_specs: Added support for -nostdlibs.
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* bsp_specs: Replace -lrtemsall with -lrtemsbsp -lrtemscpu,
replace -lrtemsall_g with -lrtemsbsp_g -lrtemscpu_g.
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* scitab/.cvsignore: Add.
* configure.in: Add --enable-console, CPU_CLOCK_RATE_HZ, autoheader
bspopt.h.
* include/bsp.h: Complete rewrite based on the AMOS-BSP.
* README: Update.
* bsp_specs: copy from gensh1
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* The shsim is for the SH simulator in gdb. It should be able
to be used with multiple SH CPU models.
* .cvsignore, ChangeLog, Makefile.am, README, bsp_specs,
configure.in, clock/.cvsignore, clock/Makefile.am,
clock/clockdrv.c, console/.cvsignore, console/Makefile.am,
console/console-io.c, console/console-support.S,
include/.cvsignore, include/Makefile.am, include/bsp.h,
start/.cvsignore, start/Makefile.am, start/regs.S,
start/start.S, startup/.cvsignore, startup/Makefile.am,
startup/bspstart.c, startup/linkcmds, wrapup/.cvsignore,
wrapup/Makefile.am: New files.
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