[committed] libphobos: Build runtime library with -ffunction-sections -fdata-sections

diff --git a/libphobos/Makefile.in b/libphobos/Makefile.in
index eab12688867..a8f7e160742 100644
--- a/libphobos/Makefile.in
+++ b/libphobos/Makefile.in
@@ -271,6 +271,7 @@  PACKAGE_URL = @PACKAGE_URL@
 PACKAGE_VERSION = @PACKAGE_VERSION@
 PATH_SEPARATOR = @PATH_SEPARATOR@
 RANLIB = @RANLIB@
+SECTION_FLAGS = @SECTION_FLAGS@
 SED = @SED@
 SET_MAKE = @SET_MAKE@
 SHELL = @SHELL@
diff --git a/libphobos/configure b/libphobos/configure
index 59ca64aa1e0..fe7cd9c11ff 100755
--- a/libphobos/configure
+++ b/libphobos/configure
@@ -700,6 +700,7 @@  DRUNTIME_CPU_ARM_FALSE
 DRUNTIME_CPU_ARM_TRUE
 DRUNTIME_CPU_AARCH64_FALSE
 DRUNTIME_CPU_AARCH64_TRUE
+SECTION_FLAGS
 libphobos_srcdir
 libphobos_builddir
 get_gcc_base_ver
@@ -11749,7 +11750,7 @@  else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11752 "configure"
+#line 11753 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11855,7 +11856,7 @@  else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11858 "configure"
+#line 11859 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -14085,6 +14086,48 @@  fi
   fi
 
 
+
+
+  gdc_save_DFLAGS=$GDCFLAGS
+  GDCFLAGS="-fno-moduleinfo -nostdinc -I $phobos_cv_abs_srcdir/libdruntime -nophoboslib $GDCFLAGS"
+
+    ac_ext=d
+ac_compile='$GDC -c $GDCFLAGS conftest.$ac_ext >&5'
+ac_link='$GDC -o conftest$ac_exeext $GDCFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=yes
+
+    GDCFLAGS="$GDCFLAGS -g -Werror -ffunction-sections -fdata-sections"
+    cat > conftest.$ac_ext <<_ACEOF
+module mod;
+int foo; void bar() { }
+
+extern(C) int main() {
+  return 0;
+}
+_ACEOF
+if ac_fn_d_try_compile "$LINENO"; then :
+  ac_fdsections=yes
+else
+  ac_fdsections=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+    if test "x$ac_fdsections" = "xyes"; then
+      SECTION_FLAGS='-ffunction-sections -fdata-sections'
+    fi
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_fdsections" >&5
+$as_echo "$ac_fdsections" >&6; }
+    ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+  GDCFLAGS=$gdc_save_DFLAGS
+
+
+
+
   druntime_target_cpu_parsed=""
   case "$target_cpu" in
       aarch64*)
diff --git a/libphobos/configure.ac b/libphobos/configure.ac
index 248d0ebbc19..3b5a830cccf 100644
--- a/libphobos/configure.ac
+++ b/libphobos/configure.ac
@@ -137,6 +137,7 @@  GCC_BASE_VER
 DRUNTIME_CONFIGURE
 DRUNTIME_MULTILIB
 DRUNTIME_WERROR
+DRUNTIME_SECTION_FLAGS
 DRUNTIME_CPU_SOURCES
 DRUNTIME_OS_SOURCES
 DRUNTIME_OS_THREAD_MODEL
diff --git a/libphobos/libdruntime/Makefile.am b/libphobos/libdruntime/Makefile.am
index 74a0f006036..02a68b10424 100644
--- a/libphobos/libdruntime/Makefile.am
+++ b/libphobos/libdruntime/Makefile.am
@@ -24,7 +24,7 @@  D_EXTRA_DFLAGS=-nostdinc -I $(srcdir) -I .
 # D flags for compilation
 AM_DFLAGS= \
 	$(phobos_lt_pic_flag) $(phobos_compiler_shared_flag) \
-	$(WARN_DFLAGS) $(CHECKING_DFLAGS) $(CET_DFLAGS)
+	$(WARN_DFLAGS) $(CHECKING_DFLAGS) $(SECTION_FLAGS) $(CET_DFLAGS)
 
 # Flags for other kinds of sources
 AM_CFLAGS=$(CET_FLAGS)
diff --git a/libphobos/libdruntime/Makefile.in b/libphobos/libdruntime/Makefile.in
index 63b2133e69c..853a7fc1981 100644
--- a/libphobos/libdruntime/Makefile.in
+++ b/libphobos/libdruntime/Makefile.in
@@ -635,6 +635,7 @@  PACKAGE_URL = @PACKAGE_URL@
 PACKAGE_VERSION = @PACKAGE_VERSION@
 PATH_SEPARATOR = @PATH_SEPARATOR@
 RANLIB = @RANLIB@
+SECTION_FLAGS = @SECTION_FLAGS@
 SED = @SED@
 SET_MAKE = @SET_MAKE@
 SHELL = @SHELL@
@@ -727,7 +728,7 @@  D_EXTRA_DFLAGS = -nostdinc -I $(srcdir) -I .
 # D flags for compilation
 AM_DFLAGS = \
 	$(phobos_lt_pic_flag) $(phobos_compiler_shared_flag) \
-	$(WARN_DFLAGS) $(CHECKING_DFLAGS) $(CET_DFLAGS)
+	$(WARN_DFLAGS) $(CHECKING_DFLAGS) $(SECTION_FLAGS) $(CET_DFLAGS)
 
 
 # Flags for other kinds of sources
diff --git a/libphobos/m4/druntime.m4 b/libphobos/m4/druntime.m4
index 7221712a888..2a7a689dd18 100644
--- a/libphobos/m4/druntime.m4
+++ b/libphobos/m4/druntime.m4
@@ -116,3 +116,22 @@  AC_DEFUN([DRUNTIME_INSTALL_DIRECTORIES],
   gdc_include_dir='$(libdir)/gcc/${target_alias}/${gcc_version}/include/d'
   AC_SUBST(gdc_include_dir)
 ])
+
+# DRUNTIME_SECTION_FLAGS
+# ----------------------
+# Check for -ffunction-sections nad -fdata-sections.
+AC_DEFUN([DRUNTIME_SECTION_FLAGS],
+[
+  WITH_LOCAL_DRUNTIME([
+    AC_LANG_PUSH([D])
+    GDCFLAGS="$GDCFLAGS -g -Werror -ffunction-sections -fdata-sections"
+    AC_TRY_COMPILE([int foo; void bar() { }],[return 0;],
+		   [ac_fdsections=yes], [ac_fdsections=no])
+    if test "x$ac_fdsections" = "xyes"; then
+      SECTION_FLAGS='-ffunction-sections -fdata-sections'
+    fi
+    AC_MSG_RESULT($ac_fdsections)
+    AC_LANG_POP([D])
+  ], [-nophoboslib])
+  AC_SUBST(SECTION_FLAGS)
+])
diff --git a/libphobos/src/Makefile.am b/libphobos/src/Makefile.am
index 2dedc740f16..f97ddccaca8 100644
--- a/libphobos/src/Makefile.am
+++ b/libphobos/src/Makefile.am
@@ -25,7 +25,7 @@  D_EXTRA_DFLAGS=-nostdinc -I $(srcdir) \
 # D flags for compilation
 AM_DFLAGS= \
 	$(phobos_lt_pic_flag) $(phobos_compiler_shared_flag) \
-	$(WARN_DFLAGS) $(CHECKING_DFLAGS) $(CET_DFLAGS)
+	$(WARN_DFLAGS) $(CHECKING_DFLAGS) $(SECTION_FLAGS) $(CET_DFLAGS)
 
 # Flags for other kinds of sources
 AM_CFLAGS=$(CET_FLAGS)
diff --git a/libphobos/src/Makefile.in b/libphobos/src/Makefile.in
index 9e410e5b642..4f76e1077d5 100644
--- a/libphobos/src/Makefile.in
+++ b/libphobos/src/Makefile.in
@@ -388,6 +388,7 @@  PACKAGE_URL = @PACKAGE_URL@
 PACKAGE_VERSION = @PACKAGE_VERSION@
 PATH_SEPARATOR = @PATH_SEPARATOR@
 RANLIB = @RANLIB@
+SECTION_FLAGS = @SECTION_FLAGS@
 SED = @SED@
 SET_MAKE = @SET_MAKE@
 SHELL = @SHELL@
@@ -482,7 +483,7 @@  D_EXTRA_DFLAGS = -nostdinc -I $(srcdir) \
 # D flags for compilation
 AM_DFLAGS = \
 	$(phobos_lt_pic_flag) $(phobos_compiler_shared_flag) \
-	$(WARN_DFLAGS) $(CHECKING_DFLAGS) $(CET_DFLAGS)
+	$(WARN_DFLAGS) $(CHECKING_DFLAGS) $(SECTION_FLAGS) $(CET_DFLAGS)
 
 
 # Flags for other kinds of sources
diff --git a/libphobos/testsuite/Makefile.in b/libphobos/testsuite/Makefile.in
index 51eb4efc79d..885548018ba 100644
--- a/libphobos/testsuite/Makefile.in
+++ b/libphobos/testsuite/Makefile.in
@@ -215,6 +215,7 @@  PACKAGE_URL = @PACKAGE_URL@
 PACKAGE_VERSION = @PACKAGE_VERSION@
 PATH_SEPARATOR = @PATH_SEPARATOR@
 RANLIB = @RANLIB@
+SECTION_FLAGS = @SECTION_FLAGS@
 SED = @SED@
 SET_MAKE = @SET_MAKE@
 SHELL = @SHELL@