commit: 6d93631928bc2939043fcac603967acea604d915
parent: 5bbd418ff3631968dd78c2aede811f96e15a4cbf
author: Brian Callahan <bcallah@openbsd.org>
date: Thu, 9 Jul 2020 14:02:07 -0400
Add --enable-lto for those who want link-time optimization.
1 file changed, 39 insertions(+), 1 deletion(-)
diff --git a/configure b/configure
@@ -188,6 +188,20 @@ EOF
fi
}
+ltoflagcheck() {
+ cat << EOF > conftest.c
+int main(void){return 0;}
+EOF
+ $cc $cflags -flto $ldflags -o conftest conftest.c > /dev/null 2>&1
+ if [ $? -eq 0 ] ; then
+ rm -f conftest conftest.o conftest.c
+ return 1
+ else
+ rm -f conftest conftest.o conftest.c
+ return 0
+ fi
+}
+
ncursescheck() {
cat << EOF > conftest.c
#include <term.h>
@@ -502,7 +516,7 @@ wflagcheck() {
cat << EOF > conftest.c
int main(void){return 0;}
EOF
- $cc -w -o conftest conftest.c > /dev/null 2> conftest.err
+ $cc $cflags -w $ldflags -o conftest conftest.c > /dev/null 2>&1
grep ':' conftest.err > /dev/null 2>&1
if [ $? -eq 0 ] ; then
rm -f conftest conftest.err conftest.o conftest.c
@@ -530,6 +544,7 @@ libs=""
curses=1
instsh=0
static=0
+lto=0
# Options
for opt
@@ -580,6 +595,13 @@ do
static=0
fi
;;
+ --disable-lto|--enable-lto)
+ if [ "x$opt" = "x--enable-lto" ] ; then
+ lto=1
+ else
+ lto=0
+ fi
+ ;;
--help|-h)
echo "Usage: configure [options]"
echo ""
@@ -596,6 +618,8 @@ do
echo "Use curses library for screen clear [default=yes]"
printf " --enable-ksh "
echo "Install executable as ksh [default=no]"
+ printf " --enable-lto "
+ echo "Enable link-time optimization [default=no]"
printf " --enable-sh "
echo "Install additional sh executable [default=no]"
printf " --enable-static "
@@ -677,6 +701,20 @@ case "x$os" in
;;
esac
+printf "checking for -flto compiler flag... "
+if [ $lto -eq 0 ] ; then
+ echo "not enabled"
+else
+ ltoflagcheck
+ if [ $lto -eq 0 ] ; then
+ echo "no"
+ else
+ cflags="$cflags -flto"
+ ldflags="$ldflags -flto -Wl,-O3"
+ echo "yes"
+ fi
+fi
+
cat << EOF > pconfig.h
/* This file automatically generated by configure. */
