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Default to --with-default-link=yes if configure check finds good -shared layout.
This commit is contained in:
Roland McGrath
parent
5c55070081
commit
fd5e21c75d
@ -1,5 +1,9 @@
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2011-07-02 Roland McGrath <roland@hack.frob.com>
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* configure.in (use-default-link): Default to yes if a test -shared
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link meets our qualifications.
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* configure: Regenerated.
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* config.make.in (output-format): New variable.
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* configure.in: Check for ld --print-output-format support.
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* configure: Regenerated.
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67
configure
vendored
67
configure
vendored
@ -1469,7 +1469,7 @@ Optional Packages:
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--without-cvs if CVS should not be used
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--with-headers=PATH location of system headers to use (for example
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/usr/src/linux/include) [default=compiler default]
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--with-default-link do not use explicit linker scripts [default=no]
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--with-default-link do not use explicit linker scripts
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--with-tls enable support for TLS
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--without-__thread do not use TLS features even when supporting them
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--with-cpu=CPU select code for CPU variant
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@ -3593,7 +3593,7 @@ fi
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if test "${with_default_link+set}" = set; then :
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withval=$with_default_link; use_default_link=$withval
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else
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use_default_link=no
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use_default_link=default
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fi
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@ -6702,6 +6702,69 @@ fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_hashstyle" >&5
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$as_echo "$libc_cv_hashstyle" >&6; }
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# The linker's default -shared behavior is good enough if it
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# does these things that our custom linker scripts ensure that
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# all allocated NOTE sections come first.
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if test "$use_default_link" = default; then
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for sufficient default -shared layout" >&5
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$as_echo_n "checking for sufficient default -shared layout... " >&6; }
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if ${libc_cv_use_default_link+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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libc_cv_use_default_link=no
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cat > conftest.s <<\EOF
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.section .note.a,"a",%note
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.balign 4
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.long 4,4,9
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.string "GNU"
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.string "foo"
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.section .note.b,"a",%note
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.balign 4
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.long 4,4,9
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.string "GNU"
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.string "bar"
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EOF
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if { ac_try=' ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&5'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; } &&
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ac_try=`$READELF -S conftest.so | sed -n \
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'${x;p;}
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s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
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t a
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b
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: a
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H'`
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then
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libc_seen_a=no libc_seen_b=no
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set -- $ac_try
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while test $# -ge 2 -a "$1" = NOTE; do
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case "$2" in
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.note.a) libc_seen_a=yes ;;
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.note.b) libc_seen_b=yes ;;
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esac
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shift 2
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done
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case "$libc_seen_a$libc_seen_b" in
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yesyes)
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libc_cv_use_default_link=yes
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;;
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*)
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echo >&5 "\
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$libc_seen_a$libc_seen_b from:
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$ac_try"
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;;
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esac
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fi
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rm -f conftest*
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_use_default_link" >&5
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$as_echo "$libc_cv_use_default_link" >&6; }
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use_default_link=$libc_cv_use_default_link
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fi
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking linker output format" >&5
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58
configure.in
58
configure.in
@ -117,10 +117,9 @@ AC_ARG_WITH([headers],
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AC_SUBST(use_default_link)
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AC_ARG_WITH([default-link],
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AC_HELP_STRING([--with-default-link],
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[do not use explicit linker scripts
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@<:@default=no@:>@]),
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[do not use explicit linker scripts]),
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[use_default_link=$withval],
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[use_default_link=no])
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[use_default_link=default])
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AC_ARG_ENABLE([sanity-checks],
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AC_HELP_STRING([--disable-sanity-checks],
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@ -1801,6 +1800,59 @@ EOF
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fi
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rm -f conftest*])
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AC_SUBST(libc_cv_hashstyle)
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# The linker's default -shared behavior is good enough if it
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# does these things that our custom linker scripts ensure that
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# all allocated NOTE sections come first.
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if test "$use_default_link" = default; then
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AC_CACHE_CHECK([for sufficient default -shared layout],
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libc_cv_use_default_link, [dnl
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libc_cv_use_default_link=no
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cat > conftest.s <<\EOF
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.section .note.a,"a",%note
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.balign 4
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.long 4,4,9
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.string "GNU"
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.string "foo"
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.section .note.b,"a",%note
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.balign 4
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.long 4,4,9
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.string "GNU"
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.string "bar"
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EOF
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if AC_TRY_COMMAND([dnl
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${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
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ac_try=`$READELF -S conftest.so | sed -n \
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['${x;p;}
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s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
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t a
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b
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: a
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H']`
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then
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libc_seen_a=no libc_seen_b=no
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set -- $ac_try
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while test $# -ge 2 -a "$1" = NOTE; do
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case "$2" in
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.note.a) libc_seen_a=yes ;;
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.note.b) libc_seen_b=yes ;;
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esac
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shift 2
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done
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case "$libc_seen_a$libc_seen_b" in
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yesyes)
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libc_cv_use_default_link=yes
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;;
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*)
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echo >&AS_MESSAGE_LOG_FD "\
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$libc_seen_a$libc_seen_b from:
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$ac_try"
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;;
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esac
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fi
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rm -f conftest*])
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use_default_link=$libc_cv_use_default_link
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fi
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fi
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AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
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