source: rtems/c/configure.ac @ d8de6b9

5
Last change on this file since d8de6b9 was 2afb22b, checked in by Chris Johns <chrisj@…>, on Dec 23, 2017 at 7:18:56 AM

Remove make preinstall

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.

  • Property mode set to 100644
File size: 2.7 KB
Line 
1## Process this file with autoconf to produce a configure script.
2##
3
4AC_PREREQ([2.69])
5AC_INIT([rtems-c],[_RTEMS_VERSION],[https://devel.rtems.org/newticket])
6AC_CONFIG_SRCDIR([src])
7RTEMS_TOP(..)
8RTEMS_SOURCE_TOP
9RTEMS_BUILD_TOP
10
11RTEMS_CANONICAL_TARGET_CPU
12
13AM_INIT_AUTOMAKE([no-define foreign 1.12.2])
14AM_MAINTAINER_MODE
15
16## These options are used within this file.
17RTEMS_ENABLE_RTEMSBSP
18
19# Set up rtems_bsp
20AS_IF([test x"$enable_rtemsbsp" = x"no"],[
21# --disable-rtemsbsp
22  rtems_bsp=""
23],[
24  AS_IF([test -z "$enable_rtemsbsp"],
25    [# --enable-rtemsbsp=""
26    RTEMS_CHECK_BSPS(rtems_bsp)],
27    [# --enable-rtemsbsp="list"
28    rtems_bsp="$enable_rtemsbsp"])
29])
30
31# Check sanity of BSPs in $rtems_bsp
32for _rtems_bsp in : $rtems_bsp; do test "x$_rtems_bsp" = x: && continue
33  # make sure there is a make/custom file for the bsp
34  _RTEMS_CHECK_CUSTOM_BSP([$_rtems_bsp.cfg],[bsp_cfg])
35
36  AS_IF([test -n "$bsp_cfg"],
37  [
38    # retrieve bsp_family
39    RTEMS_BSP_ALIAS([$_rtems_bsp],[rtems_bsp_family])
40
41    # Is there a configure script for the BSP?
42    AS_IF([test -r "$srcdir/$RTEMS_TOPdir/c/src/lib/libbsp/$RTEMS_CPU/$rtems_bsp_family/configure"],
43      [RTEMS_BSP_LIST="$RTEMS_BSP_LIST $_rtems_bsp"])
44  ])
45done
46
47#
48# Compose the configuration arguments to be passed to c/src/configure
49#
50##
51## Partially borrowed from autoconf-2.13
52##
53
54## Adjust paths
55_RTEMS_ADJUST_SRCDIR([rtems_bsp_configure],[src])
56rtems_bsp_configure="$rtems_bsp_configure/configure"
57  RTEMS_CONFIGURE_ARGS_QUOTE([rtems_bsp_configure_args],
58    [-enable-rtemsbsp=* | --enable-rtemsbsp=* ) ;;])
59
60rtems_bsp_configure="$rtems_bsp_configure $rtems_bsp_configure_args"
61rtems_bsp_configure="$rtems_bsp_configure '--with-project-root=../../'"
62rtems_bsp_configure="$rtems_bsp_configure '--with-project-top=../../'"
63AC_SUBST(rtems_bsp_configure)
64
65AC_SUBST(RTEMS_BSP_LIST)
66
67# Explicitly list all Makefiles here
68AC_CONFIG_FILES([Makefile],[
69for bsp in : $RTEMS_BSP_LIST; do test "x$bsp" = x: && continue
70rtems_source_top=$(cd ${srcdir}/.. && pwd)
71cat >> Makefile << BSPEOF
72
73$bsp: src/configure
74        @set fnord \$(MAKEFLAGS); amf=\[$]\[$]2; \\
75          echo "Configuring RTEMS_BSP=$bsp"; \\
76          \$(MKDIR_P) $bsp; \\
77          ( cd $bsp && \\
78           CONFIG_SHELL=\$(SHELL) RTEMS_BSP=$bsp \$(rtems_bsp_configure) \\
79           --with-rtems-build-top=\$\${PWD} --with-rtems-source-top=${rtems_source_top} ) \\
80          || case "\$\$amf" in *=*) exit 1;; *k*) fail=yes;; *) exit 1;; esac;
81BSPEOF
82done
83],[RTEMS_BSP_LIST="$RTEMS_BSP_LIST"])
84AC_OUTPUT
85AS_IF([test -n "$RTEMS_BSP_LIST"],[
86echo
87echo target architecture: $target_cpu.
88echo available BSPs: $RTEMS_BSP_LIST.
89echo \'${MAKE} all\' will build the following BSPs: $RTEMS_BSP_LIST.
90echo other BSPs can be built with \'${MAKE} RTEMS_BSP=\"bsp1 bsp2 ...\"\'
91echo
92])
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