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[AArch64] Fall back to -fPIC if no support of -fpic in binutils

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2015-07-01  Jiong Wang  <jiong.wang@arm.com>

	* configure.ac: Add check for aarch64 assembler -fpic relocation
	modifier support.
	* configure: Regenerate.
	* config.in: Regenerate.
	* config/aarch64/aarch64.c (initialize_aarch64_code_model): Fall back
	to -fPIC if not support of -fpic relocation modifier in assembler.

From-SVN: r225231
This commit is contained in:
Jiong Wang 2015-07-01 08:45:08 +00:00 committed by Jiong Wang
parent 1d628b1536
commit 34ecdb0f20
5 changed files with 60 additions and 0 deletions
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9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
2015-07-01 Jiong Wang <jiong.wang@arm.com>
* configure.ac: Add check for aarch64 assembler -fpic relocation
modifier support.
* configure: Regenerate.
* config.in: Regenerate.
* config/aarch64/aarch64.c (initialize_aarch64_code_model): Fall back
to -fPIC if not support of -fpic relocation modifier in assembler.
2015-07-01 Richard Sandiford <richard.sandiford@arm.com>
PR bootstrap/66685

6
gcc/config.in
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@ -606,6 +606,12 @@
#endif
/* Define if your assembler supports relocs needed by -fpic. */
#ifndef USED_FOR_TARGET
#undef HAVE_AS_SMALL_PIC_RELOCS
#endif
/* Define if your assembler and linker support thread-local storage. */
#ifndef USED_FOR_TARGET
#undef HAVE_AS_TLS

4
gcc/config/aarch64/aarch64.c
View File

@ -7581,9 +7581,13 @@ initialize_aarch64_code_model (void)
aarch64_cmodel = AARCH64_CMODEL_TINY_PIC;
break;
case AARCH64_CMODEL_SMALL:
#ifdef HAVE_AS_SMALL_PIC_RELOCS
aarch64_cmodel = (flag_pic == 2
? AARCH64_CMODEL_SMALL_PIC
: AARCH64_CMODEL_SMALL_SPIC);
#else
aarch64_cmodel = AARCH64_CMODEL_SMALL_PIC;
#endif
break;
case AARCH64_CMODEL_LARGE:
sorry ("code model %qs with -f%s", "large",

34
gcc/configure vendored
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@ -24228,6 +24228,40 @@ $as_echo "#define HAVE_AS_MABI_OPTION 1" >>confdefs.h
done
fi
fi
# Check if we have binutils support for relocations types needed by -fpic
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for -fpic relocs" >&5
$as_echo_n "checking assembler for -fpic relocs... " >&6; }
if test "${gcc_cv_as_aarch64_picreloc+set}" = set; then :
$as_echo_n "(cached) " >&6
else
gcc_cv_as_aarch64_picreloc=no
if test x$gcc_cv_as != x; then
$as_echo '
.text
ldr x0, [x2, #:gotpage_lo15:globalsym]
' > conftest.s
if { ac_try='$gcc_cv_as $gcc_cv_as_flags -o conftest.o conftest.s >&5'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }
then
gcc_cv_as_aarch64_picreloc=yes
else
echo "configure: failed program was" >&5
cat conftest.s >&5
fi
rm -f conftest.o conftest.s
fi
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_aarch64_picreloc" >&5
$as_echo "$gcc_cv_as_aarch64_picreloc" >&6; }
if test $gcc_cv_as_aarch64_picreloc = yes; then
$as_echo "#define HAVE_AS_SMALL_PIC_RELOCS 1" >>confdefs.h
fi
# Enable default workaround for AArch64 Cortex-A53 erratum 835769.
# Check whether --enable-fix-cortex-a53-835769 was given.
if test "${enable_fix_cortex_a53_835769+set}" = set; then :

7
gcc/configure.ac
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@ -3562,6 +3562,13 @@ case "$target" in
done
fi
fi
# Check if we have binutils support for relocations types needed by -fpic
gcc_GAS_CHECK_FEATURE([-fpic relocs], gcc_cv_as_aarch64_picreloc,,,
[
.text
ldr x0, [[x2, #:gotpage_lo15:globalsym]]
],,[AC_DEFINE(HAVE_AS_SMALL_PIC_RELOCS, 1,
[Define if your assembler supports relocs needed by -fpic.])])
# Enable default workaround for AArch64 Cortex-A53 erratum 835769.
AC_ARG_ENABLE(fix-cortex-a53-835769,
[