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# serial 1
# Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
# Copyright © 2010, 2014, 2016 Guillem Jover <guillem@debian.org>
# DPKG_LINKER_OPTIMIZATIONS
# -------------------------
# Add configure option to disable linker optimizations.
AC_DEFUN([DPKG_LINKER_OPTIMIZATIONS], [
AC_ARG_ENABLE([linker-optimizations],
[AS_HELP_STRING([--disable-linker-optimizations],
[Disable (detected) linker optimizations])],
[], [enable_linker_optimizations=yes])
AS_IF([test "x$enable_linker_optimizations" = "xno"], [
LDFLAGS=$(echo "$LDFLAGS" | $SED -e "s/ -Wl,-O[[0-9]]*\b//g")
], [
save_LDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -Wl,-O1"
AC_LINK_IFELSE([
AC_LANG_PROGRAM([[]], [[]])
], [], [
LDFLAGS="$save_LDFLAGS"
])
])
])
# DPKG_LINKER_AS_NEEDED
# ---------------------
AC_DEFUN([DPKG_LINKER_AS_NEEDED], [
AC_CACHE_CHECK([for --as-needed linker flag], [dpkg_cv_linker_as_needed], [
save_LDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -Wl,--as-needed"
AC_LINK_IFELSE([
AC_LANG_PROGRAM([], [])
], [
dpkg_cv_linker_as_needed=yes
], [
dpkg_cv_linker_as_needed=no
])
LDFLAGS="$save_LDFLAGS"
])
AM_CONDITIONAL([HAVE_LINKER_AS_NEEDED],
[test "x$dpkg_cv_linker_as_needed" = "xyes"])
])
# DPKG_LINKER_VERSION_SCRIPT
# --------------------------
AC_DEFUN([DPKG_LINKER_VERSION_SCRIPT], [
AC_CACHE_CHECK([for --version-script linker flag], [dpkg_cv_version_script], [
echo "{ global: symbol; local: *; };" >conftest.map
save_LDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
AC_LINK_IFELSE([
AC_LANG_PROGRAM([[
extern int symbol(void);
int symbol(void) { return 0; }
]], [[
]])
], [
dpkg_cv_version_script=yes
], [
dpkg_cv_version_script=no
])
LDFLAGS="$save_LDFLAGS"
rm -f conftest.map
])
AM_CONDITIONAL([HAVE_LINKER_VERSION_SCRIPT],
[test "x$dpkg_cv_version_script" = "xyes"])
])
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