ARM: Clean up EABI-related configury

ChangeLog

@@ -1,3 +1,15 @@
+2014-07-16  Roland McGrath  <roland@hack.frob.com>
+
+	* sysdeps/arm/preconfigure.ac: Apply EABI sanity check to arm*, not
+	just Linux configurations.  Test empirically that the compiler sets
+	__ARM_EABI__, rather than using the tuple to decide.
+	* sysdeps/arm/preconfigure: Regenerated.
+	* sysdeps/unix/sysv/linux/arm/configure: File removed.
+	* sysdeps/unix/sysv/linux/arm/configure.ac: File removed,
+	contents appended ...
+	* sysdeps/arm/configure.ac: ... here.
+	* sysdeps/arm/configure: Regenerated.
+
 2014-07-15  Roland McGrath  <roland@hack.frob.com>
 
 	* nptl/pthread_kill.c: New file.

sysdeps/arm/configure

@@ -210,3 +210,11 @@ else
   config_vars="$config_vars
 have-arm-tls-desc = no"
 fi
+
+libc_cv_gcc_unwind_find_fde=no
+
+# Remove -fno-unwind-tables that was added in sysdeps/arm/preconfigure.ac.
+CFLAGS=${CFLAGS% -fno-unwind-tables}
+
+libc_cv_gcc_exceptions=yes
+exceptions=-fexceptions

sysdeps/arm/configure.ac

@@ -39,3 +39,14 @@ if test $libc_cv_arm_tls_desc = yes; then
 else
   LIBC_CONFIG_VAR([have-arm-tls-desc], [no])
 fi
+
+libc_cv_gcc_unwind_find_fde=no
+
+# Remove -fno-unwind-tables that was added in sysdeps/arm/preconfigure.ac.
+CFLAGS=${CFLAGS% -fno-unwind-tables}
+
+dnl The normal configure check for gcc -fexecptions fails because it can't
+dnl find __aeabi_unwind_cpp_pr0.  Work around this here; our GCC definitely
+dnl has -fexceptions.
+libc_cv_gcc_exceptions=yes
+exceptions=-fexceptions

sysdeps/arm/preconfigure

@@ -3,22 +3,36 @@
 
 case "$machine" in
 arm*)
-  case $config_os in
+
-  linux-gnueabi*)
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-    # If the compiler enables unwind tables by default, this causes
+/* end confdefs.h.  */
-    # problems with undefined symbols in -nostdlib link tests.  To
+
-    # avoid this, add -fno-unwind-tables here and remove it in
+#if !__ARM_EABI__
-    # sysdeps/unix/sysv/linux/arm/configure.ac after those tests have
+#error
-    # been run.
+#endif
-    if test "${CFLAGS+set}" != "set"; then
+int
-      CFLAGS="-g -O2"
+main ()
-    fi
+{
-    CFLAGS="$CFLAGS -fno-unwind-tables"
+
-    ;;
+  ;
-  linux*)
+  return 0;
-    as_fn_error $? "Old ABI no longer supported" "$LINENO" 5
+}
-    ;;
+_ACEOF
-  esac
+if ac_fn_c_try_compile "$LINENO"; then :
+
+else
+  as_fn_error $? "Old ABI no longer supported" "$LINENO" 5
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+  # If the compiler enables unwind tables by default, this causes
+  # problems with undefined symbols in -nostdlib link tests.  To
+  # avoid this, add -fno-unwind-tables here and remove it in
+  # sysdeps/arm/configure.ac after those tests have been run.
+  if test "${CFLAGS+set}" != "set"; then
+    CFLAGS="-g -O2"
+  fi
+  CFLAGS="$CFLAGS -fno-unwind-tables"
 
   base_machine=arm
   # Lets ask the compiler which ARM family we've got

sysdeps/arm/preconfigure.ac

@@ -3,22 +3,19 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
 
 case "$machine" in
 arm*)
-  case $config_os in
+  AC_TRY_COMPILE([
-  linux-gnueabi*)
+#if !__ARM_EABI__
-    # If the compiler enables unwind tables by default, this causes
+#error
-    # problems with undefined symbols in -nostdlib link tests.  To
+#endif], [], [], [AC_MSG_ERROR([Old ABI no longer supported])])
-    # avoid this, add -fno-unwind-tables here and remove it in
+
-    # sysdeps/unix/sysv/linux/arm/configure.ac after those tests have
+  # If the compiler enables unwind tables by default, this causes
-    # been run.
+  # problems with undefined symbols in -nostdlib link tests.  To
-    if test "${CFLAGS+set}" != "set"; then
+  # avoid this, add -fno-unwind-tables here and remove it in
-      CFLAGS="-g -O2"
+  # sysdeps/arm/configure.ac after those tests have been run.
-    fi
+  if test "${CFLAGS+set}" != "set"; then
-    CFLAGS="$CFLAGS -fno-unwind-tables"
+    CFLAGS="-g -O2"
-    ;;
+  fi
-  linux*)
+  CFLAGS="$CFLAGS -fno-unwind-tables"
-    AC_MSG_ERROR([Old ABI no longer supported])
-    ;;
-  esac
 
   base_machine=arm
   # Lets ask the compiler which ARM family we've got

sysdeps/unix/sysv/linux/arm/configure

@@ -1,9 +0,0 @@
-# This file is generated from configure.ac by Autoconf.  DO NOT EDIT!
- # Local configure fragment for sysdeps/unix/sysv/linux/arm.
-
-libc_cv_gcc_unwind_find_fde=no
-# Remove -fno-unwind-tables that was added in sysdeps/arm/preconfigure.ac.
-CFLAGS=${CFLAGS% -fno-unwind-tables}
-
-libc_cv_gcc_exceptions=yes
-exceptions=-fexceptions

sysdeps/unix/sysv/linux/arm/configure.ac

@@ -1,12 +0,0 @@
-GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
-# Local configure fragment for sysdeps/unix/sysv/linux/arm.
-
-libc_cv_gcc_unwind_find_fde=no
-# Remove -fno-unwind-tables that was added in sysdeps/arm/preconfigure.ac.
-CFLAGS=${CFLAGS% -fno-unwind-tables}
-
-dnl The normal configure check for gcc -fexecptions fails because it can't
-dnl find __aeabi_unwind_cpp_pr0.  Work around this here; our GCC definitely
-dnl has -fexceptions.
-libc_cv_gcc_exceptions=yes
-exceptions=-fexceptions