2009-08-12 Tristan Gingold <gingold@adacore.com>

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

diff --git a/gold/configure.ac b/gold/configure.ac
index a770f877e9a78eeca94a47aaa8fe8853f893743a..0a535987d914fda02ec71eb001f8db8a037330bf 100644 (file)
--- a/gold/configure.ac
+++ b/gold/configure.ac
@@ -221,6 +221,9 @@ AM_CONDITIONAL(FN_PTRS_IN_SO_WITHOUT_PIC, [
     *) true;;
   esac])
 
+dnl Whether we can test -mcmodel=medium.
+AM_CONDITIONAL(MCMODEL_MEDIUM, [test "$target_cpu" = "x86_64"])
+
 dnl Test for __thread support.
 AC_CACHE_CHECK([for thread support], [gold_cv_c_thread],
 [AC_COMPILE_IFELSE([__thread int i = 1;],
@@ -312,18 +315,38 @@ LFS_CFLAGS="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
 AC_SUBST(LFS_CFLAGS)
 
 AC_CHECK_FUNCS(chsize)
-AC_REPLACE_FUNCS(pread ftruncate)
+AC_REPLACE_FUNCS(pread ftruncate mremap ffsll)
 
 # Link in zlib if we can.  This allows us to write compressed sections.
 AC_SEARCH_LIBS(zlibVersion, z, [AC_CHECK_HEADERS(zlib.h)])
 AM_CONDITIONAL(HAVE_ZLIB, test "$ac_cv_search_zlibVersion" != "no")
 
+dnl We have to check these in C, not C++, because autoconf generates
+dnl tests which have no type information, and current glibc provides
+dnl multiple declarations of functions like basename when compiling
+dnl with C++.
+AC_CHECK_DECLS([basename, ffs, asprintf, vasprintf, snprintf, vsnprintf, strverscmp])
+
 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)
+AC_CHECK_DECLS([basename, ffs, asprintf, vasprintf, snprintf, vsnprintf, strverscmp, strndup, memmem])
+
+# Use of ::std::tr1::unordered_map::rehash causes undefined symbols
+# at link time with some versions of GCC.
+AC_CACHE_CHECK([whether ::std::tr1::unordered_map::rehash is usable.],
+[gold_cv_unordered_map_rehash],
+[AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#include <tr1/unordered_map>
+void bar() { ::std::tr1::unordered_map<int, int> x; x.rehash(10); }
+]])], [gold_cv_unordered_map_rehash=yes], [gold_cv_unordered_map_rehash=no])])
+if test "$gold_cv_unordered_map_rehash" = "yes"; then
+  AC_DEFINE(HAVE_TR1_UNORDERED_MAP_REHASH, 1,
+           [Define if ::std::tr1::unordered_map::rehash 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