Add support for subsections to the ELF assembler. Fixes PR8717.

[oota-llvm.git] / autoconf / configure.ac

diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index ae615df2029ba34b45d994a57ba3ac37f7b2c971..0097db3d681d87a9dedd3da921cf9a4d0cac1009 100644 (file)
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -1270,43 +1270,24 @@ dnl Check optional compiler flags.
 AC_MSG_CHECKING([optional compiler flags])
 CXX_FLAG_CHECK(NO_VARIADIC_MACROS, [-Wno-variadic-macros])
 CXX_FLAG_CHECK(NO_MISSING_FIELD_INITIALIZERS, [-Wno-missing-field-initializers])
-CXX_FLAG_CHECK(NO_NESTED_ANON_TYPES, [-Wno-nested-anon-types])
 CXX_FLAG_CHECK(COVERED_SWITCH_DEFAULT, [-Wcovered-switch-default])
+
 dnl GCC's potential uninitialized use analysis is weak and presents lots of
 dnl false positives, so disable it.
+NO_UNINITIALIZED=
+NO_MAYBE_UNINITIALIZED=
 if test "$GXX" = "yes"
 then
   CXX_FLAG_CHECK(NO_MAYBE_UNINITIALIZED, [-Wno-maybe-uninitialized])
   dnl gcc 4.7 introduced -Wmaybe-uninitialized to distinguish cases which are
-  dnl known to be uninitialized from cases which might be uninitialized.  We 
+  dnl known to be uninitialized from cases which might be uninitialized.  We
   dnl still want to catch the first kind of errors.
-  if test "$NO_MAYBE_UNINITIALIZED" != "-Wno-maybe-uninitialized"
+  if test -z "$NO_MAYBE_UNINITIALIZED"
   then
     CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized])
-  else
-    dnl Some versions of gcc accept unsupported -W flags if there is
-    dnl no warning but stop with an error when a warning is
-    dnl encountered.  If this gcc is earlier than 4.7, just use
-    dnl -Wno-uninitialized.
-    gxx_version=`$CXX -dumpversion`
-    gxx_version_major=`echo $gxx_version | cut -d'.' -f1`
-    gxx_version_minor=`echo $gxx_version | cut -d'.' -f2`
-    gxx_version_patch=`echo $gxx_version | cut -d'.' -f3`
-
-    if    test "$gxx_version_major" -ge "4" \
-       && test "$gxx_version_minor" -ge "7"; then
-      dnl AC_SUBST doesn't work with empty strings.
-      NO_UNINITIALIZED=
-    else
-      NO_MAYBE_UNINITIALIZED=
-      CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized])
-    fi
   fi
-else
-  NO_UNINITIALIZED=
-  NO_MAYBE_UNINITIALIZED=
 fi
-AC_MSG_RESULT([$NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS $NO_NESTED_ANON_TYPES $COVERED_SWITCH_DEFAULT $NO_UNINITIALIZED $NO_MAYBE_UNINITIALIZED])
+AC_MSG_RESULT([$NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS $COVERED_SWITCH_DEFAULT $NO_UNINITIALIZED $NO_MAYBE_UNINITIALIZED])
 
 AC_ARG_WITH([python],
             [AS_HELP_STRING([--with-python], [path to python])],
@@ -1512,6 +1493,7 @@ AC_CHECK_HEADERS([sys/mman.h sys/param.h sys/resource.h sys/time.h sys/uio.h])
 AC_CHECK_HEADERS([sys/types.h sys/ioctl.h malloc/malloc.h mach/mach.h])
 AC_CHECK_HEADERS([valgrind/valgrind.h])
 AC_CHECK_HEADERS([fenv.h])
+AC_CHECK_DECLS([FE_ALL_EXCEPT, FE_INEXACT], [], [], [[#include <fenv.h>]])
 if test "$LLVM_ENABLE_THREADS" -eq 1 && test "$ENABLE_PTHREADS" -eq 1 ; then
   AC_CHECK_HEADERS(pthread.h,
                    AC_SUBST(HAVE_PTHREAD, 1),