I did see gcc-4.7 fail to build for an ARM soft-float/hard-float multilib
configuration. The reason is that gcc -print-multi-directory doesn't print
anything for the non-default, and gcc -print-multi-lib only prints `.' (and then
not building the runtime libs for the non-default). The reason is that
set_multilib_dir in gcc.c only consults MULTILIB_DEFAULTS (only defined in
linux-elf.h), but not configure_default_options in configargs.h. This proposed
patch updates MULTILIB_DEFAULTS depending on the configure options. An
alternative approach would be to update set_multilib_dir and print_multilib_info
to lookup configure_default_options in configargs.h as well.
Note that this didn't fail to build in gcc-4.6, but I can't see yet what change
did cause the build failure.
I didn't check if other targets need an update as well.
Ok for the trunk?
Matthias
# DP: Set MULTILIB_DEFAULTS for ARM multilib builds
* config.gcc (arm*-*-*): Set TARGET_CONFIGURED_FLOAT_ABI and
TARGET_CONFIGURED_THUMB_MODE when configured --with-float and
--with-mode.
* config/arm/linux-eabi.h (MULTILIB_DEFAULTS): Set depending
on TARGET_CONFIGURED_FLOAT_ABI, TARGET_CONFIGURED_THUMB_MODE and
TARGET_BIG_ENDIAN_DEFAULT.
Index: b/src/gcc/config.gcc
===================================================================
--- a/src/gcc/config.gcc 2012-05-02 10:24:10.585842104 +0000
+++ b/src/gcc/config.gcc 2012-05-02 10:26:12.509846641 +0000
@@ -3047,10 +3047,18 @@
esac
case "$with_float" in
- "" \
- | soft | hard | softfp)
+ "")
# OK
;;
+ soft)
+ tm_defines="${tm_defines} TARGET_CONFIGURED_FLOAT_ABI=0"
+ ;;
+ softfp)
+ tm_defines="${tm_defines} TARGET_CONFIGURED_FLOAT_ABI=1"
+ ;;
+ hard)
+ tm_defines="${tm_defines} TARGET_CONFIGURED_FLOAT_ABI=2"
+ ;;
*)
echo "Unknown floating point type used in
--with-float=$with_float" 1>&2
exit 1
@@ -3094,6 +3102,9 @@
"" \
| arm | thumb )
#OK
+ if test "$with_mode" = thumb; then
+ tm_defines="${tm_defines}
TARGET_CONFIGURED_THUMB_MODE=1"
+ fi
;;
*)
echo "Unknown mode used in --with-mode=$with_mode"
Index: b/src/gcc/config/arm/linux-eabi.h
===================================================================
--- a/src/gcc/config/arm/linux-eabi.h 2012-05-02 10:24:10.585842104 +0000
+++ b/src/gcc/config/arm/linux-eabi.h 2012-05-02 10:26:55.141848227 +0000
@@ -34,7 +34,21 @@
/* We default to a soft-float ABI so that binaries can run on all
target hardware. */
#undef TARGET_DEFAULT_FLOAT_ABI
+#ifdef TARGET_CONFIGURED_FLOAT_ABI
+#if TARGET_CONFIGURED_FLOAT_ABI == 2
+#define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_HARD
+#define MULTILIB_DEFAULT_FLOAT_ABI "mfloat-abi=hard"
+#elif TARGET_CONFIGURED_FLOAT_ABI == 1
+#define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFTFP
+#define MULTILIB_DEFAULT_FLOAT_ABI "mfloat-abi=softfp"
+#else
+#define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFT
+#define MULTILIB_DEFAULT_FLOAT_ABI "mfloat-abi=soft"
+#endif
+#else
#define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFT
+#define MULTILIB_DEFAULT_FLOAT_ABI "mfloat-abi=soft"
+#endif
/* We default to the "aapcs-linux" ABI so that enums are int-sized by
default. */
@@ -68,6 +82,28 @@
"%{mfloat-abi=hard:" GLIBC_DYNAMIC_LINKER_HARD_FLOAT "} \
%{!mfloat-abi=hard:" GLIBC_DYNAMIC_LINKER_SOFT_FLOAT "}"
+/* Set the multilib defaults according the configuration, needed to
+ let gcc -print-multi-dir do the right thing. */
+
+#if TARGET_BIG_ENDIAN_DEFAULT
+#define MULTILIB_DEFAULT_ENDIAN "mbig-endian"
+#else
+#define MULTILIB_DEFAULT_ENDIAN "mlittle-endian"
+#endif
+
+#ifndef TARGET_CONFIGURED_THUMB_MODE
+#define MULTILIB_DEFAULT_MODE "marm"
+#elif TARGET_CONFIGURED_THUMB_MODE == 1
+#define MULTILIB_DEFAULT_MODE "mthumb"
+#else
+#define MULTILIB_DEFAULT_MODE "marm"
+#endif
+
+#undef MULTILIB_DEFAULTS
+#define MULTILIB_DEFAULTS \
+ { MULTILIB_DEFAULT_MODE, MULTILIB_DEFAULT_ENDIAN, \
+ MULTILIB_DEFAULT_FLOAT_ABI, "mno-thumb-interwork" }
+
/* At this point, bpabi.h will have clobbered LINK_SPEC. We want to
use the GNU/Linux version, not the generic BPABI version. */
#undef LINK_SPEC
