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-rw-r--r--m4/dpkg-linker.m465
1 files changed, 65 insertions, 0 deletions
diff --git a/m4/dpkg-linker.m4 b/m4/dpkg-linker.m4
new file mode 100644
index 0000000..d3abb30
--- /dev/null
+++ b/m4/dpkg-linker.m4
@@ -0,0 +1,65 @@
+# 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([], [])
+ ], [
+ 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"])
+])