Avoid $(shell) in determining default ARM ABI

["Joseph S. Myers" <joseph at codesourcery dot com>]

I've applied this patch to avoid use of $(shell) when determining the 
default ARM ABI, instead generating a makefile fragment from the configure 
scripts, as previously requested by Roland.  (I put the relevant code in 
the configure fragment with the existing test for the ARM ABI, although 
the only user is the Linux-specific makefile.  That existing code is in 
fact only for the benefit of the shlib-versions file, which is in 
sysdeps/arm/shlib-versions although almost all the ports shlib-versions 
files are in fact Linux-specific despite their sysdeps locations.)

2012-11-21  Joseph Myers  <joseph@codesourcery.com>

	* sysdeps/arm/configure.in: Generate default-abi.make with
	definition of default-abi.
	* sysdeps/arm/configure: Regenerated.
	* sysdeps/unix/sysv/linux/arm/Makefile (default-abi-prog): Remove.
	(default-abi): Likewise.
	($(common-objpfx)default-abi.make): Include.

diff --git a/ports/sysdeps/arm/configure b/ports/sysdeps/arm/configure
index 385f295..91239cd 100644
--- a/ports/sysdeps/arm/configure
+++ b/ports/sysdeps/arm/configure
@@ -197,4 +197,7 @@ $as_echo "$libc_cv_arm_pcs_vfp" >&6; }
 if test $libc_cv_arm_pcs_vfp = yes; then
   $as_echo "#define HAVE_ARM_PCS_VFP 1" >>confdefs.h
 
+  echo "default-abi := hard" > default-abi.make
+else
+  echo "default-abi := soft" > default-abi.make
 fi
diff --git a/ports/sysdeps/arm/configure.in b/ports/sysdeps/arm/configure.in
index 7e91332..6073d0e 100644
--- a/ports/sysdeps/arm/configure.in
+++ b/ports/sysdeps/arm/configure.in
@@ -40,4 +40,7 @@ AC_CACHE_CHECK([whether the compiler is using the ARM hard-float ABI],
   ], libc_cv_arm_pcs_vfp=yes, libc_cv_arm_pcs_vfp=no)])
 if test $libc_cv_arm_pcs_vfp = yes; then
   AC_DEFINE(HAVE_ARM_PCS_VFP)
+  echo "default-abi := hard" > default-abi.make
+else
+  echo "default-abi := soft" > default-abi.make
 fi
diff --git a/ports/sysdeps/unix/sysv/linux/arm/Makefile b/ports/sysdeps/unix/sysv/linux/arm/Makefile
index bda3ea9..be7946e 100644
--- a/ports/sysdeps/unix/sysv/linux/arm/Makefile
+++ b/ports/sysdeps/unix/sysv/linux/arm/Makefile
@@ -70,25 +70,16 @@ LDFLAGS-tst-rfc3484-2 += $(common-objpfx)csu/libc-do-syscall.o
 LDFLAGS-tst-rfc3484-3 += $(common-objpfx)csu/libc-do-syscall.o
 endif
 
-define default-abi-prog
-echo '#ifdef __ARM_PCS_VFP';
-echo 'hard';
-echo '#else';
-echo 'soft';
-echo '#endif'
-endef
-default-abi := $(strip $(shell \
-    ($(default-abi-prog)) | $(CC) $(CFLAGS) $(CPPFLAGS) -E -P -))
-ifeq ($(default-abi),hard)
-# OK.
-else
-ifneq ($(default-abi),soft)
-Unknown ABI, must be "hard" or "soft".
-endif
+# Get value of default-abi.
+include $(common-objpfx)default-abi.make
+
+abi-variants := soft hard
+
+ifeq (,$(filter $(default-abi),$(abi-variants)))
+Unknown ABI, must be one of $(abi-variants)
 endif
 
 abi-includes :=
-abi-variants := soft hard
 abi-soft-options := -U__ARM_PCS_VFP
 abi-soft-condition := !defined __ARM_PCS_VFP
 abi-soft-ld-soname := ld-linux.so.3

-- 
Joseph S. Myers
joseph@codesourcery.com