2012-07-16 Sriraman Tallam <tmsriram@google.com>

[deliverable/binutils-gdb.git] / gold / configure.ac

diff --git a/gold/configure.ac b/gold/configure.ac
index a2c4875eb422b893087d71d9e563d58fe82aad5e..5e3dc0601c04074213ce82180f2c1c42211a8d0e 100644 (file)
--- a/gold/configure.ac
+++ b/gold/configure.ac
@@ -499,7 +499,7 @@ AC_LANG_PUSH(C++)
 AC_CHECK_HEADERS(tr1/unordered_set tr1/unordered_map)
 AC_CHECK_HEADERS(ext/hash_map ext/hash_set)
 AC_CHECK_HEADERS(byteswap.h)
-AC_CHECK_FUNCS(mallinfo posix_fallocate readv sysconf times)
+AC_CHECK_FUNCS(mallinfo posix_fallocate fallocate readv sysconf times)
 AC_CHECK_DECLS([basename, ffs, asprintf, vasprintf, snprintf, vsnprintf, strverscmp, strndup, memmem])
 
 # Use of ::std::tr1::unordered_map::rehash causes undefined symbols
@@ -515,6 +515,25 @@ if test "$gold_cv_unordered_map_rehash" = "yes"; then
            [Define if ::std::tr1::unordered_map::rehash is usable])
 fi
 
+# Use of tr1/unordered_map with off_t as a key is not supported on GCC
+# 4.1.xx when compiling in 32-bit mode with a 64-bit off_t type.
+AC_CACHE_CHECK([whether std::tr1::hash<off_t> is defined],
+[gold_cv_hash_off_t],
+[CXXFLAGS_hold=$CXXFLAGS
+CXXFLAGS="$CXXFLAGS $LFS_CFLAGS"
+AC_COMPILE_IFELSE([
+#include <sys/types.h>
+#include <tr1/unordered_map>
+std::tr1::hash<off_t> h;
+],
+[gold_cv_hash_off_t=yes],
+[gold_cv_hash_off_t=no])
+CXXFLAGS=$CFLAGS_hold])
+if test "$gold_cv_hash_off_t" = "yes"; then
+   AC_DEFINE(HAVE_TR1_HASH_OFF_T, 1,
+            [Define if std::tr1::hash<off_t> is usable])
+fi
+
 # gcc 4.3.0 doesn't recognize the printf attribute on a template
 # function.  Check for that.  This is gcc bug 35546.  This test can
 # probably be removed after the bug has been fixed for a while.