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  • Committer: Scott James Remnant
  • Date: 2010-02-04 23:59:00 UTC
  • mfrom: (1185.1.9 upstream)
  • Revision ID: scott@netsplit.com-20100204235900-c0j0frow10azwsus
* New upstream release:
  - libnih has been separated out into its own project.
  - "start on" and "stop on" now support != matches.  LP: #513035.
  - Fixed crash in child when unable to spawn job.  LP: #451917.
  - No longer holds /dev/console open so SAK won't kill init.  LP: #486005.
  - Added missing OPTIONS section to init(8).  LP: #449883.

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m4/linker.m4
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# libnih
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#
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# linker.m4 - autoconf macros for linker settings
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#
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# Copyright © 2009 Scott James Remnant <scott@netsplit.com>.
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# Copyright © 2009 Canonical Ltd.
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#
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# This file is free software; the author gives unlimited permission to
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# copy and/or distribute it, with or without modifications, as long as
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# this notice is preserved.
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# NIH_LINKER_OPTIMISATIONS
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# ------------------------
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# Add configure option to disable linker optimisations.
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AC_DEFUN([NIH_LINKER_OPTIMISATIONS],
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[AC_ARG_ENABLE(linker-optimisations,
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        AS_HELP_STRING([--disable-linker-optimisations],
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                       [Disable linker optimisations]),
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[AS_IF([test "x$enable_linker_optimisations" = "xno"],
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       [LDFLAGS=`echo "$LDFLAGS" | sed -e "s/ -Wl,-O[0-9]*\b//g"`],
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       [LDFLAGS="$LDFLAGS -Wl,-O1"])
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])dnl
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])# NIH_LINKER_OPTIMISATIONS
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# NIH_LINKER_VERSION_SCRIPT
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# -------------------------
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# Detect whether the linker supports version scripts
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AC_DEFUN([NIH_LINKER_VERSION_SCRIPT],
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[AC_CACHE_CHECK([for linker version script argument], [nih_cv_version_script],
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[nih_cv_version_script=none
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for nih_try_arg in "-Wl,--version-script"; do
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        nih_old_libs="$LIBS"
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        LIBS="$LIBS $nih_try_arg=conftest.ver"
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        cat >conftest.ver <<EOF
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TEST {
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        global:
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                *;
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};
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EOF
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        AC_TRY_LINK([], [], [
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                rm -f conftest.ver
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                LIBS="$nih_old_libs"
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                nih_cv_version_script="$nih_try_arg"
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                break
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        ])
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        rm -f conftest.ver
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        LIBS="$nih_old_libs"
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done])
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AS_IF([test "x$nih_cv_version_script" != "xnone"],
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      [AC_SUBST(VERSION_SCRIPT_ARG, [$nih_cv_version_script])])
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AM_CONDITIONAL(HAVE_VERSION_SCRIPT_ARG,
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               [test "x$nih_cv_version_script" != "xnone"])
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])# NIH_LINKER_VERSION_SCRIPT
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# NIH_LINKER_SYMBOLIC_FUNCTIONS
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# -----------------------------
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# Detect whether the linker supports symbolic functions
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AC_DEFUN([NIH_LINKER_SYMBOLIC_FUNCTIONS],
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[AC_CACHE_CHECK([for linker symbolic functions argument],
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[nih_cv_symbolic_functions],
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[nih_cv_symbolic_functions=none
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for nih_try_arg in "-Wl,-Bsymbolic-functions"; do
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        nih_old_ldflags="$LDFLAGS"
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        LDFLAGS="$LDFLAGS $nih_try_arg"
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        AC_TRY_LINK([], [], [
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                LDFLAGS="$nih_old_ldflags"
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                nih_cv_symbolic_functions="$nih_try_arg"
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                break
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        ])
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        LDFLAGS="$nih_old_ldflags"
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done])
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AS_IF([test "x$nih_cv_symbolic_functions" != "xnone"],
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      [LDFLAGS="$LDFLAGS $nih_cv_symbolic_functions"])dnl
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])# NIH_LINKER_SYMBOLIC_FUNCTIONS