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Date: Thu, 01 Mar 2018 10:23:54 -0800
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: tytso@....edu, darrick.wong@...cle.com
Cc: djwong@...nel.org, linux-ext4@...r.kernel.org
Subject: [PATCH 4/7] misc: enable link time optimization, if requested
From: Darrick J. Wong <darrick.wong@...cle.com>
Enable link time optimization (LTO) if the builder requests it. The
extra link optimization results in smaller binaries.
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
MCONFIG.in | 19 +++++---
configure | 138 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
configure.ac | 34 ++++++++++++++
debian/rules | 2 -
4 files changed, 184 insertions(+), 9 deletions(-)
diff --git a/MCONFIG.in b/MCONFIG.in
index ee83554..f06933d 100644
--- a/MCONFIG.in
+++ b/MCONFIG.in
@@ -81,21 +81,24 @@ SYSTEMD_SYSTEM_UNIT_DIR = @systemd_system_unit_dir@
@ifNotGNUmake@ CHECK_CMD=true
@ifNotGNUmake@ CPPCHECK_CMD=true
+SANITIZER_CFLAGS = @lto_cflags@
+SANITIZER_LDFLAGS = @lto_ldflags@
+
CC = @CC@
BUILD_CC = @BUILD_CC@
-CFLAGS = @CFLAGS@
-CFLAGS_SHLIB = @CFLAGS_SHLIB@
-CFLAGS_STLIB = @CFLAGS_STLIB@
+CFLAGS = $(SANITIZER_CFLAGS) @CFLAGS@
+CFLAGS_SHLIB = $(SANITIZER_CFLAGS) @CFLAGS_SHLIB@
+CFLAGS_STLIB = $(SANITIZER_CFLAGS) @CFLAGS_STLIB@
CPPFLAGS = @INCLUDES@
ALL_CFLAGS = $(CPPFLAGS) $(CFLAGS) $(CFLAGS_WARN) @DEFS@ $(LOCAL_CFLAGS)
ALL_CFLAGS_SHLIB = $(CPPFLAGS) $(CFLAGS_SHLIB) $(CFLAGS_WARN) @DEFS@ $(LOCAL_CFLAGS)
ALL_CFLAGS_STLIB = $(CPPFLAGS) $(CFLAGS_STLIB) $(CFLAGS_WARN) @DEFS@ $(LOCAL_CFLAGS)
-LDFLAGS = @LDFLAGS@
-LDFLAGS_SHLIB = @LDFLAGS_SHLIB@
+LDFLAGS = $(SANITIZER_LDFLAGS) @LDFLAGS@
+LDFLAGS_SHLIB = $(SANITIZER_LDFLAGS) @LDFLAGS_SHLIB@
ALL_LDFLAGS = $(LDFLAGS) @LDFLAG_DYNAMIC@
-LDFLAGS_STATIC = @LDFLAGS_STATIC@
-BUILD_CFLAGS = @BUILD_CFLAGS@
-BUILD_LDFLAGS = @BUILD_LDFLAGS@
+LDFLAGS_STATIC = $(SANITIZER_LDFLAGS) @LDFLAGS_STATIC@
+BUILD_CFLAGS = $(SANITIZER_CFLAGS) @BUILD_CFLAGS@
+BUILD_LDFLAGS = $(SANITIZER_LDFLAGS) @BUILD_LDFLAGS@
RDYNAMIC = @RDYNAMIC@
LINK_BUILD_FLAGS = @LINK_BUILD_FLAGS@
LINK_INSTALL_FLAGS = @LINK_INSTALL_FLAGS@
diff --git a/configure b/configure
index db6e4a0..c298cc4 100755
--- a/configure
+++ b/configure
@@ -653,6 +653,11 @@ E2SCRUB_CMT
UNIX_CMT
CYGWIN_CMT
LINUX_CMT
+lto_ldflags
+lto_cflags
+have_lto
+gcc_ranlib
+gcc_ar
UNI_DIFF_OPTS
SEM_INIT_LIB
FUSE_CMT
@@ -902,6 +907,7 @@ with_libiconv_prefix
with_included_gettext
with_libintl_prefix
enable_fuse2fs
+enable_lto
with_multiarch
with_udev_rules_dir
with_crond_dir
@@ -1580,6 +1586,7 @@ Optional Features:
--disable-threads build without multithread safety
--disable-rpath do not hardcode runtime library paths
--disable-fuse2fs do not build fuse2fs
+ --enable-lto enable link time optimization
Optional Packages:
--with-PACKAGE[=ARG] use PACKAGE [ARG=yes]
@@ -13725,6 +13732,137 @@ $as_echo "#define HAVE_EXT2_IOCTLS 1" >>confdefs.h
;;
esac
+# Check whether --enable-lto was given.
+if test "${enable_lto+set}" = set; then :
+ enableval=$enable_lto;
+else
+ enable_lto=probe
+fi
+
+if test "$enable_lto" = "yes" || test "$enable_lto" = "probe"; then
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking if C compiler supports LTO" >&5
+$as_echo_n "checking if C compiler supports LTO... " >&6; }
+ OLD_CFLAGS="$CFLAGS"
+ OLD_LDFLAGS="$LDFLAGS"
+ LTO_FLAGS="-flto -ffat-lto-objects"
+ CFLAGS="$CFLAGS $LTO_FLAGS"
+ LDFLAGS="$LDFLAGS $LTO_FLAGS"
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+int
+main ()
+{
+
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+ lto_cflags=$LTO_FLAGS
+ lto_ldflags=$LTO_FLAGS
+ # Extract the first word of "gcc-ar", so it can be a program name with args.
+set dummy gcc-ar; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_gcc_ar+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ case $gcc_ar in
+ [\\/]* | ?:[\\/]*)
+ ac_cv_path_gcc_ar="$gcc_ar" # Let the user override the test with a path.
+ ;;
+ *)
+ as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+ IFS=$as_save_IFS
+ test -z "$as_dir" && as_dir=.
+ for ac_exec_ext in '' $ac_executable_extensions; do
+ if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+ ac_cv_path_gcc_ar="$as_dir/$ac_word$ac_exec_ext"
+ $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+ break 2
+ fi
+done
+ done
+IFS=$as_save_IFS
+
+ ;;
+esac
+fi
+gcc_ar=$ac_cv_path_gcc_ar
+if test -n "$gcc_ar"; then
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_ar" >&5
+$as_echo "$gcc_ar" >&6; }
+else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+ # Extract the first word of "gcc-ranlib", so it can be a program name with args.
+set dummy gcc-ranlib; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_gcc_ranlib+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ case $gcc_ranlib in
+ [\\/]* | ?:[\\/]*)
+ ac_cv_path_gcc_ranlib="$gcc_ranlib" # Let the user override the test with a path.
+ ;;
+ *)
+ as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+ IFS=$as_save_IFS
+ test -z "$as_dir" && as_dir=.
+ for ac_exec_ext in '' $ac_executable_extensions; do
+ if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+ ac_cv_path_gcc_ranlib="$as_dir/$ac_word$ac_exec_ext"
+ $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+ break 2
+ fi
+done
+ done
+IFS=$as_save_IFS
+
+ ;;
+esac
+fi
+gcc_ranlib=$ac_cv_path_gcc_ranlib
+if test -n "$gcc_ranlib"; then
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_ranlib" >&5
+$as_echo "$gcc_ranlib" >&6; }
+else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+rm -f core conftest.err conftest.$ac_objext \
+ conftest$ac_exeext conftest.$ac_ext
+ if test -x "$gcc_ar" && test -x "$gcc_ranlib"; then
+ have_lto=yes
+ AR="${gcc_ar}"
+ RANLIB="${gcc_ranlib}"
+ fi
+ CFLAGS="${OLD_CFLAGS}"
+ LDFLAGS="${OLD_LDFLAGS}"
+
+
+
+fi
+if test "$enable_lto" = "yes" && test "$have_lto" != "yes"; then
+ as_fn_error $? "LTO not supported by compiler." "$LINENO" 5
+fi
LINUX_CMT="#"
CYGWIN_CMT="#"
UNIX_CMT=
diff --git a/configure.ac b/configure.ac
index 34935b7..77bea4f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1294,6 +1294,40 @@ linux*)
;;
esac
dnl
+dnl Enable LTO for all packages
+dnl
+AC_ARG_ENABLE([lto],
+[ --enable-lto enable link time optimization],,
+enable_lto=probe)
+if test "$enable_lto" = "yes" || test "$enable_lto" = "probe"; then
+ AC_MSG_CHECKING([if C compiler supports LTO])
+ OLD_CFLAGS="$CFLAGS"
+ OLD_LDFLAGS="$LDFLAGS"
+ LTO_FLAGS="-flto -ffat-lto-objects"
+ CFLAGS="$CFLAGS $LTO_FLAGS"
+ LDFLAGS="$LDFLAGS $LTO_FLAGS"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
+ [AC_MSG_RESULT([yes])]
+ [lto_cflags=$LTO_FLAGS]
+ [lto_ldflags=$LTO_FLAGS]
+ [AC_PATH_PROG(gcc_ar, gcc-ar,,)]
+ [AC_PATH_PROG(gcc_ranlib, gcc-ranlib,,)],
+ [AC_MSG_RESULT([no])])
+ if test -x "$gcc_ar" && test -x "$gcc_ranlib"; then
+ have_lto=yes
+ AR="${gcc_ar}"
+ RANLIB="${gcc_ranlib}"
+ fi
+ CFLAGS="${OLD_CFLAGS}"
+ LDFLAGS="${OLD_LDFLAGS}"
+ AC_SUBST(have_lto)
+ AC_SUBST(lto_cflags)
+ AC_SUBST(lto_ldflags)
+fi
+if test "$enable_lto" = "yes" && test "$have_lto" != "yes"; then
+ AC_MSG_ERROR([LTO not supported by compiler.])
+fi
+dnl
dnl OS-specific uncomment control
dnl
LINUX_CMT="#"
diff --git a/debian/rules b/debian/rules
index b6df023..176ea78 100755
--- a/debian/rules
+++ b/debian/rules
@@ -164,7 +164,7 @@ endif
BACKTRACE_CONF_FLAGS ?= $(shell if ${debdir}/scripts/test-backtrace ; then echo --disable-backtrace ; fi)
-COMMON_CONF_FLAGS = --disable-e2initrd-helper \
+COMMON_CONF_FLAGS = --enable-lto --disable-e2initrd-helper \
--infodir=/usr/share/info --enable-symlink-install \
--with-multiarch=$(DEB_HOST_MULTIARCH) \
$(BACKTRACE_CONF_FLAGS) $(UTIL_CONF_FLAGS)
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