1 files changed, 64 insertions, 0 deletions
diff --git a/m4/dpkg-linker.m4 b/m4/dpkg-linker.m4
new file mode 100644
index 0000000..1bb6435
--- /dev/null
+++ b/m4/dpkg-linker.m4
@@ -0,0 +1,64 @@
+# 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([], [])
+    ], [
+      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"])
+])