PING. I am enclosing the patch here for review.
On Wed, Feb 11, 2015 at 8:47 AM, H.J. Lu <hjl.to...@gmail.com> wrote:
> PING.
>
> On Wed, Jan 28, 2015 at 8:05 AM, H.J. Lu <hjl.to...@gmail.com> wrote:
>> PING.
>>
>> On Tue, Jan 13, 2015 at 3:25 PM, H.J. Lu <hjl.to...@gmail.com> wrote:
>>> On Tue, Jan 13, 2015 at 5:03 AM, H.J. Lu <hjl.to...@gmail.com> wrote:
>>>> On Mon, Jan 12, 2015 at 11:50:41PM +0000, Joseph Myers wrote:
>>>>> On Mon, 12 Jan 2015, H.J. Lu wrote:
>>>>>
>>>>> > +if test x$enable_default_pie = xyes; then
>>>>> > + AC_MSG_CHECKING(if $target supports default PIE)
>>>>> > + enable_default_pie=no
>>>>> > + case $target in
>>>>> > + i?86*-*-linux* | x86_64*-*-linux*)
>>>>> > + saved_LDFLAGS="$LDFLAGS"
>>>>> > + saved_CFLAGS="$CFLAGS"
>>>>> > + CFLAGS="$CFLAGS -fPIE"
>>>>> > + LDFLAGS="$LDFLAGS -fPIE -pie"
>>>>> > + AC_TRY_LINK(,,[enable_default_pie=yes],)
>>>>> > + LDFLAGS="$saved_LDFLAGS"
>>>>> > + CFLAGS="$saved_CFLAGS"
>>>>> > + ;;
>>>>> > + *)
>>>>> > + ;;
>>>>> > + esac
>>>>>
>>>>> There should not be any such hardcoding of targets here without concrete
>>>>> evidence that the targets for which this sets enable_default_pie=no really
>>>>> cannot support PIE. In particular, there is no reason at all for this to
>>>>> be architecture-specific; all GNU/Linux architectures should support PIE.
>>>>>
>>>>> I believe AC_TRY_LINK here will test for the host, whereas what you want
>>>>> to know is what's supported for the target (but it's not possible to run
>>>>> link tests for the target at this point; the compiler for the target
>>>>> hasn't even been built).
>>>>>
>>>>> So: just presume that if the user passes --enable-default-pie then they
>>>>> know what they are doing, and don't try to override their choice.
>>>>>
>>>>> > diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
>>>>> > index c9e3bf1..89fc305 100644
>>>>> > --- a/gcc/doc/install.texi
>>>>> > +++ b/gcc/doc/install.texi
>>>>> > @@ -1583,6 +1583,10 @@ not be built.
>>>>> > Specify that the run-time libraries for stack smashing protection
>>>>> > should not be built.
>>>>> >
>>>>> > +@item --enable-default-pie
>>>>> > +Turn on @option{-fPIE} and @option{-pie} by default if supported.
>>>>> > +Currently supported targets are i?86-*-linux* and x86-64-*-linux*.
>>>>>
>>>>> The "if supported" and target list can then be removed here.
>>>>>
>>>>
>>>> Here is the updated patch. To support --enable-default-pie, each target
>>>> must update STARTFILE_SPEC to support PIE_SPEC and NO_PIE_SPEC. I can
>>>> provide STARTFILE_SPEC patch if needed.
>>>>
>>>> Thanks.
>>>>
>>>>
>>>> H.J.
>>>> ---
>>>> gcc/
>>>>
>>>> 2015-01-12 Magnus Granberg <zo...@gentoo.org>
>>>> H.J. Lu <hongjiu...@intel.com>
>>>>
>>>> * Makefile.in (COMPILER): Add @NO_PIE_CFLAGS@.
>>>> (LINKER): Add @NO_PIE_FLAG@.
>>>> (libgcc.mvars): Set NO_PIE_CFLAGS to -fno-PIE for
>>>> --enable-default-pie.
>>>> * common.opt (fPIE): Initialize to -1.
>>>> (fpie): Likewise.
>>>> (static): Add "RejectNegative Negative(shared)".
>>>> (no-pie): New option.
>>>> (pie): Replace "Negative(shared)" with "Negative(no-pie)".
>>>> * configure.ac: Add --enable-default-pie.
>>>> (NO_PIE_CFLAGS): New. Check if -fno-PIE works. AC_SUBST.
>>>> (NO_PIE_FLAG): New. Check if -no-pie works. AC_SUBST.
>>>> * defaults.h (DEFAULT_FLAG_PIE): New. Default PIE to -fPIE.
>>>> * gcc.c (NO_PIE_SPEC): New.
>>>> (PIE_SPEC): Likewise.
>>>> (LD_PIE_SPEC): Likewise.
>>>> (LINK_PIE_SPEC): Handle -no-pie. Use PIE_SPEC and LD_PIE_SPEC.
>>>> * opts.c (DEFAULT_FLAG_PIE): New. Set to 0 if ENABLE_DEFAULT_PIE
>>>> is undefined.
>>>> (finish_options): Update opts->x_flag_pie if it is -1.
>>>> * config/gnu-user.h (FVTABLE_VERIFY_SPEC): New.
>>>> (GNU_USER_TARGET_STARTFILE_SPEC): Use FVTABLE_VERIFY_SPEC. Use
>>>> NO_PIE_SPEC and NO_PIE_SPEC if ENABLE_DEFAULT_PIE is defined.
>>>> (GNU_USER_TARGET_STARTFILE_SPEC): Use FVTABLE_VERIFY_SPEC.
>>>> * doc/install.texi: Document --enable-default-pie.
>>>> * doc/invoke.texi: Document -no-pie.
>>>> * config.in: Regenerated.
>>>> * configure: Likewise.
>>>>
>>>> gcc/ada/
>>>>
>>>> 2015-01-12 H.J. Lu <hongjiu...@intel.com>
>>>>
>>>> * gcc-interface/Makefile.in (TOOLS_LIBS): Add @NO_PIE_FLAG@.
>>>>
>>>> libgcc/
>>>>
>>>> 2015-01-12 H.J. Lu <hongjiu...@intel.com>
>>>>
>>>> * Makefile.in (CRTSTUFF_CFLAGS): Add $(NO_PIE_CFLAGS).
>>>>
>>>
>>> This is the updated patch. I fixed the -r regression. LTO tests
>>> pass now.
>>>
>>> --
>>> H.J.
>>
>>
>>
>> --
>> H.J.
>
>
>
> --
> H.J.
--
H.J.
From 46faeb11166103c6a8b1608731eccf75385fe5c9 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.to...@gmail.com>
Date: Fri, 6 Mar 2015 09:07:54 -0800
Subject: [PATCH] Add --enable-default-pie option to GCC configure
Add --enable-default-pie option to configure GCC to generate PIE by
default.
gcc/
* Makefile.in (COMPILER): Add @NO_PIE_CFLAGS@.
(LINKER): Add @NO_PIE_FLAG@.
(libgcc.mvars): Set NO_PIE_CFLAGS to -fno-PIE for
--enable-default-pie.
* common.opt (fPIE): Initialize to -1.
(fpie): Likewise.
(no-pie): New option.
(pie): Replace "Negative(shared)" with "Negative(no-pie)".
* configure.ac: Add --enable-default-pie.
(NO_PIE_CFLAGS): New. Check if -fno-PIE works. AC_SUBST.
(NO_PIE_FLAG): New. Check if -no-pie works. AC_SUBST.
* defaults.h (DEFAULT_FLAG_PIE): New. Default PIE to -fPIE.
* gcc.c (NO_PIE_SPEC): New.
(PIE_SPEC): Likewise.
(LD_PIE_SPEC): Likewise.
(LINK_PIE_SPEC): Handle -no-pie. Use PIE_SPEC and LD_PIE_SPEC.
* opts.c (DEFAULT_FLAG_PIE): New. Set to 0 if ENABLE_DEFAULT_PIE
is undefined.
(finish_options): Update opts->x_flag_pie if it is -1.
* config/gnu-user.h (FVTABLE_VERIFY_SPEC): New.
(GNU_USER_TARGET_STARTFILE_SPEC): Use FVTABLE_VERIFY_SPEC. Use
PIE_SPEC and NO_PIE_SPEC if ENABLE_DEFAULT_PIE is defined.
(GNU_USER_TARGET_STARTFILE_SPEC): Use FVTABLE_VERIFY_SPEC.
* doc/install.texi: Document --enable-default-pie.
* doc/invoke.texi: Document -no-pie.
* config.in: Regenerated.
* configure: Likewise.
gcc/ada/
* gcc-interface/Makefile.in (TOOLS_LIBS): Add @NO_PIE_FLAG@.
libgcc/
* Makefile.in (CRTSTUFF_CFLAGS): Add $(NO_PIE_CFLAGS).
---
gcc/Makefile.in | 12 ++++++
gcc/ada/gcc-interface/Makefile.in | 3 ++
gcc/common.opt | 10 +++--
gcc/config.in | 6 +++
gcc/config/gnu-user.h | 26 +++++++++----
gcc/configure | 79 ++++++++++++++++++++++++++++++++++++++-
gcc/configure.ac | 40 ++++++++++++++++++++
gcc/defaults.h | 6 +++
gcc/doc/install.texi | 3 ++
gcc/doc/invoke.texi | 4 ++
gcc/gcc.c | 12 +++++-
gcc/opts.c | 14 +++++++
libgcc/Makefile.in | 2 +-
13 files changed, 201 insertions(+), 16 deletions(-)
diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index de1f3b6..46c3ed3 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -252,6 +252,12 @@ LINKER = $(CC)
LINKER_FLAGS = $(CFLAGS)
endif
+# We don't want to compile the compiler with -fPIE, it make PCH fail.
+COMPILER += @NO_PIE_CFLAGS@
+
+# Link with -no-pie since we compile the compiler with -fno-PIE.
+LINKER += @NO_PIE_FLAG@
+
# Like LINKER, but use a mutex for serializing front end links.
ifeq (@DO_LINK_MUTEX@,true)
LLINKER = $(SHELL) $(srcdir)/lock-and-run.sh linkfe.lck $(LINKER)
@@ -1854,6 +1860,12 @@ libgcc.mvars: config.status Makefile specs xgcc$(exeext)
echo GCC_CFLAGS = '$(GCC_CFLAGS)' >> tmp-libgcc.mvars
echo INHIBIT_LIBC_CFLAGS = '$(INHIBIT_LIBC_CFLAGS)' >> tmp-libgcc.mvars
echo TARGET_SYSTEM_ROOT = '$(TARGET_SYSTEM_ROOT)' >> tmp-libgcc.mvars
+ if test @enable_default_pie@ = yes; then \
+ NO_PIE_CFLAGS="-fno-PIE"; \
+ else \
+ NO_PIE_CFLAGS=; \
+ fi; \
+ echo NO_PIE_CFLAGS = "$$NO_PIE_CFLAGS" >> tmp-libgcc.mvars
mv tmp-libgcc.mvars libgcc.mvars
diff --git a/gcc/ada/gcc-interface/Makefile.in b/gcc/ada/gcc-interface/Makefile.in
index 60c1b5b..e09b921 100644
--- a/gcc/ada/gcc-interface/Makefile.in
+++ b/gcc/ada/gcc-interface/Makefile.in
@@ -267,6 +267,9 @@ TOOLS_LIBS = ../link.o ../targext.o ../../ggc-none.o ../../libcommon-target.a \
../../libcommon.a ../../../libcpp/libcpp.a $(LIBGNAT) $(LIBINTL) $(LIBICONV) \
../$(LIBBACKTRACE) ../$(LIBIBERTY) $(SYSLIBS) $(TGT_LIB)
+# Add -no-pie to TOOLS_LIBS since some of them are compiled with -fno-PIE.
+TOOLS_LIBS += @NO_PIE_FLAG@
+
# Specify the directories to be searched for header files.
# Both . and srcdir are used, in that order,
# so that tm.h and config.h will be found in the compilation
diff --git a/gcc/common.opt b/gcc/common.opt
index b49ac46..51f17c0 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -1765,7 +1765,7 @@ Common Report Var(flag_pic,2) Negative(fPIE)
Generate position-independent code if possible (large mode)
fPIE
-Common Report Var(flag_pie,2) Negative(fpic)
+Common Report Var(flag_pie,2) Negative(fpic) Init(-1)
Generate position-independent code for executables if possible (large mode)
fpic
@@ -1773,7 +1773,7 @@ Common Report Var(flag_pic,1) Negative(fpie)
Generate position-independent code if possible (small mode)
fpie
-Common Report Var(flag_pie,1) Negative(fPIC)
+Common Report Var(flag_pie,1) Negative(fPIC) Init(-1)
Generate position-independent code for executables if possible (small mode)
fplugin=
@@ -2846,8 +2846,12 @@ Driver
symbolic
Driver
-pie
+no-pie
Driver RejectNegative Negative(shared)
+Don't create a position independent executable
+
+pie
+Driver RejectNegative Negative(no-pie)
Create a position independent executable
z
diff --git a/gcc/config.in b/gcc/config.in
index 7bde5b1..b708f3a 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -89,6 +89,12 @@
#endif
+/* Define if your target supports default PIE and it is enabled. */
+#ifndef USED_FOR_TARGET
+#undef ENABLE_DEFAULT_PIE
+#endif
+
+
/* Define if you want more run-time sanity checks for dataflow. */
#ifndef USED_FOR_TARGET
#undef ENABLE_DF_CHECKING
diff --git a/gcc/config/gnu-user.h b/gcc/config/gnu-user.h
index 2faa2e5..5cbe5da 100644
--- a/gcc/config/gnu-user.h
+++ b/gcc/config/gnu-user.h
@@ -41,19 +41,29 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
object constructed before entering `main'. */
#if defined HAVE_LD_PIE
-#define GNU_USER_TARGET_STARTFILE_SPEC \
- "%{!shared: %{pg|p|profile:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}} \
- crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s} \
- %{fvtable-verify=none:%s; \
+#define FVTABLE_VERIFY_SPEC \
+ "%{fvtable-verify=none:%s; \
fvtable-verify=preinit:vtv_start_preinit.o%s; \
fvtable-verify=std:vtv_start.o%s}"
+#if defined ENABLE_DEFAULT_PIE
+#define GNU_USER_TARGET_STARTFILE_SPEC \
+ "%{!shared: %{pg|p|profile:gcrt1.o%s;: \
+ %{" PIE_SPEC ":Scrt1.o%s} %{" NO_PIE_SPEC ":crt1.o%s}}} \
+ crti.o%s %{static:crtbeginT.o%s;: %{shared:crtbeginS.o%s} \
+ %{" PIE_SPEC ":crtbeginS.o%s} \
+ %{" NO_PIE_SPEC ":crtbegin.o%s}}" \
+ FVTABLE_VERIFY_SPEC
+#else
+#define GNU_USER_TARGET_STARTFILE_SPEC \
+ "%{!shared: %{pg|p|profile:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}} \
+ crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}" \
+ FVTABLE_VERIFY_SPEC
+#endif
#else
#define GNU_USER_TARGET_STARTFILE_SPEC \
"%{!shared: %{pg|p|profile:gcrt1.o%s;:crt1.o%s}} \
- crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s} \
- %{fvtable-verify=none:%s; \
- fvtable-verify=preinit:vtv_start_preinit.o%s; \
- fvtable-verify=std:vtv_start.o%s}"
+ crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}" \
+ FVTABLE_VERIFY_SPEC
#endif
#undef STARTFILE_SPEC
#define STARTFILE_SPEC GNU_USER_TARGET_STARTFILE_SPEC
diff --git a/gcc/configure b/gcc/configure
index 1a35d5a..b419791 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -600,6 +600,9 @@ ac_includes_default="\
ac_subst_vars='LTLIBOBJS
LIBOBJS
+NO_PIE_FLAG
+NO_PIE_CFLAGS
+enable_default_pie
PICFLAG
enable_host_shared
enable_plugin
@@ -937,6 +940,7 @@ enable_host_shared
enable_libquadmath_support
with_linker_hash_style
with_diagnostics_color
+enable_default_pie
'
ac_precious_vars='build_alias
host_alias
@@ -1665,6 +1669,7 @@ Optional Features:
--enable-host-shared build host code as shared libraries
--disable-libquadmath-support
disable libquadmath support for Fortran
+ --enable-default-pie enable Position Independent Executable as default
Optional Packages:
--with-PACKAGE[=ARG] use PACKAGE [ARG=yes]
@@ -18147,7 +18152,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 18150 "configure"
+#line 18155 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -18253,7 +18258,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 18256 "configure"
+#line 18261 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -28432,6 +28437,76 @@ cat > gcc-driver-name.h <<EOF
#define GCC_DRIVER_NAME "${target_noncanonical}-gcc-${gcc_BASEVER}${exeext}"
EOF
+# Check whether --enable-default-pie was given.
+# Check whether --enable-default-pie was given.
+if test "${enable_default_pie+set}" = set; then :
+ enableval=$enable_default_pie; enable_default_pie=$enableval
+else
+ enable_default_pie=no
+fi
+
+if test x$enable_default_pie == xyes ; then
+
+$as_echo "#define ENABLE_DEFAULT_PIE 1" >>confdefs.h
+
+fi
+
+
+# Check if -fno-PIE works.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for -fno-PIE option" >&5
+$as_echo_n "checking for -fno-PIE option... " >&6; }
+if test "${gcc_cv_c_no_fpie+set}" = set; then :
+ $as_echo_n "(cached) " >&6
+else
+ saved_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -fno-PIE"
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+int main(void) {return 0;}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ gcc_cv_c_no_fpie=yes
+else
+ gcc_cv_c_no_fpie=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ CFLAGS="$saved_CFLAGS"
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_c_no_fpie" >&5
+$as_echo "$gcc_cv_c_no_fpie" >&6; }
+if test "$gcc_cv_c_no_fpie" = "yes"; then
+ NO_PIE_CFLAGS="-fno-PIE"
+fi
+
+
+# Check if -no-pie works.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for -no-pie option" >&5
+$as_echo_n "checking for -no-pie option... " >&6; }
+if test "${gcc_cv_no_pie+set}" = set; then :
+ $as_echo_n "(cached) " >&6
+else
+ saved_LDFLAGS="$LDFLAGS"
+ LDFLAGS="$LDFLAGS -no-pie"
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+int main(void) {return 0;}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+ gcc_cv_no_pie=yes
+else
+ gcc_cv_no_pie=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+ conftest$ac_exeext conftest.$ac_ext
+ LDFLAGS="$saved_LDFLAGS"
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_no_pie" >&5
+$as_echo "$gcc_cv_no_pie" >&6; }
+if test "$gcc_cv_no_pie" = "yes"; then
+ NO_PIE_FLAG="-no-pie"
+fi
+
+
# Configure the subdirectories
# AC_CONFIG_SUBDIRS($subdirs)
diff --git a/gcc/configure.ac b/gcc/configure.ac
index a553a65..dfd1537 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -5759,6 +5759,46 @@ cat > gcc-driver-name.h <<EOF
#define GCC_DRIVER_NAME "${target_noncanonical}-gcc-${gcc_BASEVER}${exeext}"
EOF
+# Check whether --enable-default-pie was given.
+AC_ARG_ENABLE(default-pie,
+[AS_HELP_STRING([--enable-default-pie],
+ [enable Position Independent Executable as default])],
+enable_default_pie=$enableval,
+enable_default_pie=no)
+if test x$enable_default_pie == xyes ; then
+ AC_DEFINE(ENABLE_DEFAULT_PIE, 1,
+ [Define if your target supports default PIE and it is enabled.])
+fi
+AC_SUBST([enable_default_pie])
+
+# Check if -fno-PIE works.
+AC_CACHE_CHECK([for -fno-PIE option],
+ [gcc_cv_c_no_fpie],
+ [saved_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -fno-PIE"
+ AC_COMPILE_IFELSE([int main(void) {return 0;}],
+ [gcc_cv_c_no_fpie=yes],
+ [gcc_cv_c_no_fpie=no])
+ CFLAGS="$saved_CFLAGS"])
+if test "$gcc_cv_c_no_fpie" = "yes"; then
+ NO_PIE_CFLAGS="-fno-PIE"
+fi
+AC_SUBST([NO_PIE_CFLAGS])
+
+# Check if -no-pie works.
+AC_CACHE_CHECK([for -no-pie option],
+ [gcc_cv_no_pie],
+ [saved_LDFLAGS="$LDFLAGS"
+ LDFLAGS="$LDFLAGS -no-pie"
+ AC_LINK_IFELSE([int main(void) {return 0;}],
+ [gcc_cv_no_pie=yes],
+ [gcc_cv_no_pie=no])
+ LDFLAGS="$saved_LDFLAGS"])
+if test "$gcc_cv_no_pie" = "yes"; then
+ NO_PIE_FLAG="-no-pie"
+fi
+AC_SUBST([NO_PIE_FLAG])
+
# Configure the subdirectories
# AC_CONFIG_SUBDIRS($subdirs)
diff --git a/gcc/defaults.h b/gcc/defaults.h
index 1d54798..f0acadc 100644
--- a/gcc/defaults.h
+++ b/gcc/defaults.h
@@ -1186,6 +1186,12 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#define DEFAULT_PCC_STRUCT_RETURN 1
#endif
+/* Default PIE to -fPIE. */
+#ifndef DEFAULT_FLAG_PIE
+# define DEFAULT_FLAG_PIE 2
+#endif
+
+
#ifdef GCC_INSN_FLAGS_H
/* Dependent default target macro definitions
diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index b8bb4bd..761e929 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -1583,6 +1583,9 @@ not be built.
Specify that the run-time libraries for stack smashing protection
should not be built.
+@item --enable-default-pie
+Turn on @option{-fPIE} and @option{-pie} by default.
+
@item --disable-libquadmath
Specify that the GCC quad-precision math library should not be built.
On some systems, the library is required to be linkable when building
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 006a852..7fcc8d1 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -11029,6 +11029,10 @@ For predictable results, you must also specify the same set of options
used for compilation (@option{-fpie}, @option{-fPIE},
or model suboptions) when you specify this linker option.
+@item -no-pie
+@opindex no-pie
+Don't produce a position independent executable.
+
@item -rdynamic
@opindex rdynamic
Pass the flag @option{-export-dynamic} to the ELF linker, on targets
diff --git a/gcc/gcc.c b/gcc/gcc.c
index 8a163a1..233a3db 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -737,12 +737,20 @@ proper position among the other output files. */
#endif
#endif
+#ifdef ENABLE_DEFAULT_PIE
+#define NO_PIE_SPEC "no-pie|static"
+#define PIE_SPEC NO_PIE_SPEC "|r|shared:;"
+#else
+#define PIE_SPEC "pie"
+#endif
+
#ifndef LINK_PIE_SPEC
#ifdef HAVE_LD_PIE
-#define LINK_PIE_SPEC "%{pie:-pie} "
+#define LD_PIE_SPEC "-pie"
#else
-#define LINK_PIE_SPEC "%{pie:} "
+#define LD_PIE_SPEC ""
#endif
+#define LINK_PIE_SPEC "%{no-pie:} " "%{" PIE_SPEC ":" LD_PIE_SPEC "} "
#endif
#ifndef LINK_BUILDID_SPEC
diff --git a/gcc/opts.c b/gcc/opts.c
index 39c190d..748238e 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -739,8 +739,22 @@ finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
opts->x_flag_section_anchors = 0;
}
+#ifndef ENABLE_DEFAULT_PIE
+#undef DEFAULT_FLAG_PIE
+#define DEFAULT_FLAG_PIE 0
+#endif
+
if (!opts->x_flag_opts_finished)
{
+ /* We initialize opts->x_flag_pie to -1 so that targets can set a
+ default value. */
+ if (opts->x_flag_pie == -1)
+ {
+ if (opts->x_flag_pic == 0)
+ opts->x_flag_pie = DEFAULT_FLAG_PIE;
+ else
+ opts->x_flag_pie = 0;
+ }
if (opts->x_flag_pie)
opts->x_flag_pic = opts->x_flag_pie;
if (opts->x_flag_pic && !opts->x_flag_pie)
diff --git a/libgcc/Makefile.in b/libgcc/Makefile.in
index 88ddfea..4fa0f78 100644
--- a/libgcc/Makefile.in
+++ b/libgcc/Makefile.in
@@ -284,7 +284,7 @@ INTERNAL_CFLAGS = $(CFLAGS) $(LIBGCC2_CFLAGS) $(HOST_LIBGCC2_CFLAGS) \
# Options to use when compiling crtbegin/end.
CRTSTUFF_CFLAGS = -O2 $(GCC_CFLAGS) $(INCLUDES) $(MULTILIB_CFLAGS) -g0 \
- -finhibit-size-directive -fno-inline -fno-exceptions \
+ $(NO_PIE_CFLAGS) -finhibit-size-directive -fno-inline -fno-exceptions \
-fno-zero-initialized-in-bss -fno-toplevel-reorder -fno-tree-vectorize \
-fbuilding-libgcc -fno-stack-protector $(FORCE_EXPLICIT_EH_REGISTRY) \
$(INHIBIT_LIBC_CFLAGS)
--
1.9.3
