Hi Yufeng,
Thanks for the quick response.
>> +#define ASM_MABI_SPEC "%{mabi=lp64*:}"
>
> Is '*' necessary here?
Removed it.
>> diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
>> index b1b4eef..c1a9cbd 100644
>> --- a/gcc/config/aarch64/aarch64.c
>> +++ b/gcc/config/aarch64/aarch64.c
>> @@ -5186,6 +5186,10 @@ aarch64_override_options (void)
>> {
>> aarch64_parse_tune ();
>> }
>> +#ifndef HAVE_AS_MABI_OPTION
>> + if (TARGET_ILP32)
>> + error ("Assembler does not supprt -mabi=ilp32");
>> +#endif
>
> A blank line before #ifndef and some comment to explain the reason please.
Blank line and comments are added.
>> + aarch64*-*-*)
>
> Alphabetically, this should be placed before alpha*.
Moved it up.
>
> It is not sufficient to only check with_abi itself. By default,
> aarch64*-*-elf builds both ilp32 and lp64 libraries (e.g. libgcc). This
> needs to be turned off if test x$gcc_cv_as_aarch64_mabi = xno. We also
> need to detect the situation where users explicitly configure the
> toolchain with --with-multilib-list=lp64,ilp32
>
> Here is an incremental diff based on your change to gcc/configure.ac to
> give an example on a more thorough check:
>
> diff --git a/gcc/configure.ac b/gcc/configure.ac
> index c8cf274..c590ad7 100644
> --- a/gcc/configure.ac
> +++ b/gcc/configure.ac
> @@ -3488,12 +3488,27 @@ case "$target" in
> gcc_GAS_CHECK_FEATURE([-mabi option],
> gcc_cv_as_aarch64_mabi,,
> [-mabi=lp64], [.text],,,)
> - if test $gcc_cv_as_aarch64_mabi = yes ; then
> + if test x$gcc_cv_as_aarch64_mabi = xyes ; then
> AC_DEFINE(HAVE_AS_MABI_OPTION, 1,
> [Define if your assembler supports the -mabi option.])
> - fi
> - if test x$gcc_cv_as_aarch64_mabi = xno && test x$with_abi = xilp32;
> then
> - AC_MSG_ERROR([Assembler doesnot support -mabi=ilp32. Upgrade the
> Assembler.])
> + else
> + if test x$with_abi = xilp32; then
> + AC_MSG_ERROR([Assembler does not support -mabi=ilp32. Upgrade
> the Assembler.])
> + fi
> + if test x"$with_multilib_list" = xdefault; then
> + TM_MULTILIB_CONFIG=lp64
> + else
> + aarch64_multilibs=`echo $with_multilib_list | sed -e 's/,/ /g'`
> + for aarch64_multilib in ${aarch64_multilibs}; do
> + case ${aarch64_multilib} in
> + ilp32 )
> + AC_MSG_ERROR([Assembler does not support -mabi=ilp32. Upgrade
> the Assembler.])
> + ;;
> + *)
> + ;;
> + esac
> + done
> + fi
> fi
> ;;
Updated it and tested with
1. binutils 2.23.2
a. bootstrapped with defaults and tested gcc for -mabi=lp64
(compiles) and -mabi=ilp32 gives error
b. Trying to boottsrap with --with-multilibs-list=lp64,ilp32 fails
with error msg
c. Trying to bootstrap with --with-multilibs-list=ilp32 fails with
error msg
d. Bootstrap with --with-multilibs-list=lp64 works.
2. binutils 2.24.51
a. bootstrapped with defaults and tested gcc for -mabi=lp64
(compiles) and -mabi=ilp32 (compiles)
b. Bootstrap with --with-multilibs-list=lp64,ilp32 works and tested
gcc for -mabi=lp64
compiles and -mabi=ilp32 compiles(* gives linker error in my setup -
aarch64:ilp32 architecture of input file `/tmp/ccIFqSxU.o' is
incompatible with aarch64 output; I believe this is not related to what
I am testing)
c. Bootstrap with default works
Thanks,
kugan
gcc/
+2013-12-09 Kugan Vivekanandarajah <kug...@linaro.org>
+ * configure.ac: Add check for aarch64 assembler -mabi support.
+ * configure: Regenerate.
+ * config.in: Regenerate.
+ * config/aarch64/aarch64-elf.h (ASM_MABI_SPEC): New define.
+ (ASM_SPEC): Update to substitute -mabi with ASM_MABI_SPEC.
+ * config/aarch64/aarch64.h (aarch64_override_options): Issue error if
+ assebler does not support -mabi and option ilp32 is selected.
+ * doc/install.texi: Added note that building gcc 4.9 and after with pre
+ 2.24 binutils will not support -mabi=ilp32.
+
diff --git a/gcc/config/aarch64/aarch64-elf.h b/gcc/config/aarch64/aarch64-elf.h
index 4757d22..a66c3db 100644
--- a/gcc/config/aarch64/aarch64-elf.h
+++ b/gcc/config/aarch64/aarch64-elf.h
@@ -134,13 +134,19 @@
" %{!mbig-endian:%{!mlittle-endian:" ENDIAN_SPEC "}}" \
" %{!mabi=*:" ABI_SPEC "}"
+#ifdef HAVE_AS_MABI_OPTION
+#define ASM_MABI_SPEC "%{mabi=*:-mabi=%*}"
+#else
+#define ASM_MABI_SPEC "%{mabi=lp64:}"
+#endif
+
#ifndef ASM_SPEC
#define ASM_SPEC "\
%{mbig-endian:-EB} \
%{mlittle-endian:-EL} \
%{mcpu=*:-mcpu=%*} \
-%{march=*:-march=%*} \
-%{mabi=*:-mabi=%*}"
+%{march=*:-march=%*}" \
+ASM_MABI_SPEC
#endif
#undef TYPE_OPERAND_FMT
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index b1b4eef..a53febc 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -5187,6 +5187,13 @@ aarch64_override_options (void)
aarch64_parse_tune ();
}
+/* Issue error if assembler does not support -mabi and option ilp32
+ is selected. */
+#ifndef HAVE_AS_MABI_OPTION
+ if (TARGET_ILP32)
+ error ("Assembler does not supprt -mabi=ilp32");
+#endif
+
initialize_aarch64_code_model ();
aarch64_build_bitmask_table ();
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 91a22d5..a951b82 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -3495,6 +3495,35 @@ AC_DEFINE_UNQUOTED(HAVE_LTO_PLUGIN, $gcc_cv_lto_plugin,
AC_MSG_RESULT($gcc_cv_lto_plugin)
case "$target" in
+
+ aarch64*-*-*)
+ gcc_GAS_CHECK_FEATURE([-mabi option],
+ gcc_cv_as_aarch64_mabi,,
+ [-mabi=lp64], [.text],,,)
+ if test x$gcc_cv_as_aarch64_mabi = xyes; then
+ AC_DEFINE(HAVE_AS_MABI_OPTION, 1,
+ [Define if your assembler supports the -mabi option.])
+ else
+ if test x$with_abi = xilp32; then
+ AC_MSG_ERROR([Assembler does not support -mabi=ilp32. Upgrade the
Assembler.])
+ fi
+ if test x"$with_multilib_list" = xdefault; then
+ TM_MULTILIB_CONFIG=lp64
+ else
+ aarch64_multilibs=`echo $with_multilib_list | sed -e 's/,/ /g'`
+ for aarch64_multilib in ${aarch64_multilibs}; do
+ case ${aarch64_multilib} in
+ ilp32)
+ AC_MSG_ERROR([Assembler does not support -mabi=ilp32.
Upgrade the Assembler.])
+ ;;
+ *)
+ ;;
+ esac
+ done
+ fi
+ fi
+ ;;
+
# All TARGET_ABI_OSF targets.
alpha*-*-linux* | alpha*-*-*bsd*)
gcc_GAS_CHECK_FEATURE([explicit relocation support],
diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index a8f9f8a..00c4f0d 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -3735,6 +3735,15 @@ removed and the system libunwind library will always be
used.
@html
<hr />
+@end html
+@anchor{aarch64-x-x}
+@heading aarch64*-*-*
+Pre 2.24 binutils does not have support for selecting -mabi and does not
+support ILP32. If GCC 4.9 or later is built with pre 2.24, GCC will not
+support option -mabi=ilp32.
+
+@html
+<hr />
<!-- rs6000-ibm-aix*, powerpc-ibm-aix* -->
@end html
@anchor{x-ibm-aix}
