Move arm from ports to libc.

I've moved the ARM port from ports to the main sysdeps hierarchy.
Beyond the README update, the move of the files was simply

git mv ports/sysdeps/arm sysdeps/arm
git mv ports/sysdeps/unix/arm sysdeps/unix/arm
git mv ports/sysdeps/unix/sysv/linux/arm sysdeps/unix/sysv/linux/arm

and in addition to the ChangeLog entries here, I put a note at the top
of ports/ChangeLog.arm similar to that at the top of
ChangeLog.powerpc.  There is deliberately no NEWS change, as I think
it makes the most sense to put in a general note above all ports
having moved if we can achieve that for 2.20.

Tested that disassembly of installed shared libraries for arm is the
same before and after this patch, except for data (not instructions)
in ld.so (there are assertions in sysdeps/arm/dl-machine.h, and the
path by which that file is found, and so by which it appears in the
assertion message, changes as a result of the move).

	* sysdeps/arm: Move directory from ports/sysdeps/arm.
	* sysdeps/unix/arm: Move directory from ports/sysdeps/unix/arm.
	* sysdeps/unix/sysv/linux/arm: Move directory from
	ports/sysdeps/unix/sysv/linux/arm.
	* README: Update listing for arm-*-linux-gnueabi.

ports/ChangeLog.arm:
	* sysdeps/arm: Move directory to ../sysdeps/arm.
	* sysdeps/unix/arm: Move directory to ../sysdeps.arm.
	* sysdeps/unix/sysv/linux/arm: Move directory to
	../sysdeps/unix/sysv/linux/arm.

1 files changed, 46 insertions, 0 deletions

diff --git a/sysdeps/arm/configure.ac b/sysdeps/arm/configure.ac
new file mode 100644
index 0000000000..d66500b3fd
--- /dev/null
+++ b/sysdeps/arm/configure.ac
@@ -0,0 +1,46 @@
+GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
+# Local configure fragment for sysdeps/arm.
+
+dnl It is always possible to access static and hidden symbols in an
+dnl position independent way.
+dnl NOTE: This feature was added by the GCC TLS patches.  We should test for
+dnl it.  Until we do, don't define it.
+#AC_DEFINE(PI_STATIC_AND_HIDDEN)
+
+AC_CACHE_CHECK([whether the CFI directive .cfi_sections is supported],
+  [libc_cv_asm_cfi_directive_sections],
+  [cat > conftest.s <<EOF
+	.text
+	.cfi_sections .debug_frame, .eh_frame
+	.cfi_startproc
+	.cfi_endproc
+EOF
+  if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
+    libc_cv_asm_cfi_directive_sections=yes
+  else
+    libc_cv_asm_cfi_directive_sections=no
+  fi
+  rm -f conftest*])
+if test $libc_cv_asm_cfi_directive_sections != yes; then
+  AC_MSG_ERROR([need .cfi_sections in this configuration])
+fi
+
+# We check to see if the compiler and flags are
+# selecting the hard-float ABI and if they are then
+# we set libc_cv_arm_pcs_vfp to yes which causes
+# HAVE_ARM_PCS_VFP to be defined in config.h and
+# in include/libc-symbols.h and thus available to
+# shlib-versions to select the appropriate name for
+# the dynamic linker via %ifdef.
+AC_CACHE_CHECK([whether the compiler is using the ARM hard-float ABI],
+  [libc_cv_arm_pcs_vfp],
+  [AC_EGREP_CPP(yes,[#ifdef __ARM_PCS_VFP
+                      yes
+                     #endif
+  ], 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)
+  LIBC_CONFIG_VAR([default-abi], [hard])
+else
+  LIBC_CONFIG_VAR([default-abi], [soft])
+fi