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Recent versions of the OS X linker support this but follow the existing OS X linker convention of using an underscore in the option name, i.e., -export_dynamic. Rather than changing our configure scripts to check for that alternate spelling, it is simpler to just use the compiler's -rdynamic option and let it deal with translating that to the appropriate linker option. One potential disadvantage of this approach is that the compiler will typically ignore -rdynamic on platforms where it is not supported, so the HAVE_LINK_EXPORT_DYNAMIC in config.h will not necessarily show whether that option has any effect or not. I don't see any in-tree uses of that macro, so I'm assuming it is OK. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187686 91177308-0d34-0410-b5e6-96231b3b80d8
110 lines
3.2 KiB
Plaintext
110 lines
3.2 KiB
Plaintext
#
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# Get the linker version string.
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#
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# This macro is specific to LLVM.
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#
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AC_DEFUN([AC_LINK_GET_VERSION],
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[AC_CACHE_CHECK([for linker version],[llvm_cv_link_version],
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[
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version_string="$(ld -v 2>&1 | head -1)"
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# Check for ld64.
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if (echo "$version_string" | grep -q "ld64"); then
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llvm_cv_link_version=$(echo "$version_string" | sed -e "s#.*ld64-\([^ ]*\)\( (.*)\)\{0,1\}#\1#")
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else
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llvm_cv_link_version=$(echo "$version_string" | sed -e "s#[^0-9]*\([0-9.]*\).*#\1#")
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fi
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])
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AC_DEFINE_UNQUOTED([HOST_LINK_VERSION],"$llvm_cv_link_version",
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[Linker version detected at compile time.])
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])
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#
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# Determine if the system can handle the -R option being passed to the linker.
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#
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# This macro is specific to LLVM.
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#
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AC_DEFUN([AC_LINK_USE_R],
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[AC_CACHE_CHECK([for compiler -Wl,-R<path> option],[llvm_cv_link_use_r],
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[ AC_LANG_PUSH([C])
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oldcflags="$CFLAGS"
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CFLAGS="$CFLAGS -Wl,-R."
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AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[]])],
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[llvm_cv_link_use_r=yes],[llvm_cv_link_use_r=no])
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CFLAGS="$oldcflags"
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AC_LANG_POP([C])
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])
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if test "$llvm_cv_link_use_r" = yes ; then
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AC_DEFINE([HAVE_LINK_R],[1],[Define if you can use -Wl,-R. to pass -R. to the linker, in order to add the current directory to the dynamic linker search path.])
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fi
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])
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#
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# Determine if the system can handle the -rdynamic option being passed
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# to the compiler.
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#
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# This macro is specific to LLVM.
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#
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AC_DEFUN([AC_LINK_EXPORT_DYNAMIC],
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[AC_CACHE_CHECK([for compiler -rdynamic option],
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[llvm_cv_link_use_export_dynamic],
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[ AC_LANG_PUSH([C])
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oldcflags="$CFLAGS"
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CFLAGS="$CFLAGS -rdynamic"
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AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[]])],
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[llvm_cv_link_use_export_dynamic=yes],[llvm_cv_link_use_export_dynamic=no])
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CFLAGS="$oldcflags"
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AC_LANG_POP([C])
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])
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if test "$llvm_cv_link_use_export_dynamic" = yes ; then
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AC_DEFINE([HAVE_LINK_EXPORT_DYNAMIC],[1],[Define if you can use -rdynamic.])
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fi
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])
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#
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# Determine if the system can handle the --version-script option being
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# passed to the linker.
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#
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# This macro is specific to LLVM.
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#
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AC_DEFUN([AC_LINK_VERSION_SCRIPT],
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[AC_CACHE_CHECK([for compiler -Wl,--version-script option],
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[llvm_cv_link_use_version_script],
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[ AC_LANG_PUSH([C])
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oldcflags="$CFLAGS"
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# The following code is from the autoconf manual,
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# "11.13: Limitations of Usual Tools".
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# Create a temporary directory $tmp in $TMPDIR (default /tmp).
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# Use mktemp if possible; otherwise fall back on mkdir,
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# with $RANDOM to make collisions less likely.
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: ${TMPDIR=/tmp}
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{
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tmp=`
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(umask 077 && mktemp -d "$TMPDIR/fooXXXXXX") 2>/dev/null
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` &&
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test -n "$tmp" && test -d "$tmp"
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} || {
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tmp=$TMPDIR/foo$$-$RANDOM
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(umask 077 && mkdir "$tmp")
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} || exit $?
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echo "{" > "$tmp/export.map"
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echo " global: main;" >> "$tmp/export.map"
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echo " local: *;" >> "$tmp/export.map"
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echo "};" >> "$tmp/export.map"
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CFLAGS="$CFLAGS -Wl,--version-script=$tmp/export.map"
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AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[]])],
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[llvm_cv_link_use_version_script=yes],[llvm_cv_link_use_version_script=no])
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rm "$tmp/export.map"
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rmdir "$tmp"
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CFLAGS="$oldcflags"
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AC_LANG_POP([C])
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])
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if test "$llvm_cv_link_use_version_script" = yes ; then
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AC_SUBST(HAVE_LINK_VERSION_SCRIPT,1)
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fi
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])
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