Use AC_GNU_SOURCE.

gold/Makefile.am

@@ -10,7 +10,7 @@ ACLOCAL_AMFLAGS = -I ../bfd -I ../config
 
 AM_CXXFLAGS = $(WARN_CXXFLAGS) $(LFS_CXXFLAGS)
 
-INCLUDES = -D_GNU_SOURCE \
+INCLUDES = \
 	-I$(srcdir) -I$(srcdir)/../include -I$(srcdir)/../elfcpp \
 	-DLOCALEDIR="\"$(datadir)/locale\"" \
 	-DBINDIR="\"$(bindir)\"" -DTOOLBINDIR="\"$(tooldir)/bin\"" \

gold/Makefile.in

@@ -271,7 +271,7 @@ SUBDIRS = po testsuite
 tooldir = $(exec_prefix)/$(target_alias)
 ACLOCAL_AMFLAGS = -I ../bfd -I ../config
 AM_CXXFLAGS = $(WARN_CXXFLAGS) $(LFS_CXXFLAGS)
-INCLUDES = -D_GNU_SOURCE \
+INCLUDES = \
 	-I$(srcdir) -I$(srcdir)/../include -I$(srcdir)/../elfcpp \
 	-DLOCALEDIR="\"$(datadir)/locale\"" \
 	-DBINDIR="\"$(bindir)\"" -DTOOLBINDIR="\"$(tooldir)/bin\"" \

gold/config.in

@@ -100,3 +100,8 @@
 /* Define to 1 if your processor stores words with the most significant byte
    first (like Motorola and SPARC, unlike Intel and VAX). */
 #undef WORDS_BIGENDIAN
+
+/* Enable GNU extensions on systems that have them.  */
+#ifndef _GNU_SOURCE
+# undef _GNU_SOURCE
+#endif

gold/configure

@@ -3810,6 +3810,14 @@ else
 echo "${ECHO_T}no, using $LN_S" >&6
 fi
 
+
+
+cat >>confdefs.h <<\_ACEOF
+#define _GNU_SOURCE 1
+_ACEOF
+
+
+
 # If we haven't got the data from the intl directory,
 # assume NLS is disabled.
 USE_NLS=no

gold/configure.ac

@@ -144,6 +144,9 @@ AC_PROG_YACC
 AC_PROG_RANLIB
 AC_PROG_INSTALL
 AC_PROG_LN_S
+
+AC_GNU_SOURCE
+
 ZW_GNU_GETTEXT_SISTER_DIR
 AM_PO_SUBDIRS
 

gold/testsuite/Makefile.am

@@ -11,7 +11,7 @@ AUTOMAKE_OPTIONS =
 # eventually.
 AM_CXXFLAGS = $(WARN_CXXFLAGS) $(LFS_CXXFLAGS) -fmerge-constants
 
-INCLUDES = -D_GNU_SOURCE \
+INCLUDES = \
 	-I$(srcdir) -I$(srcdir)/.. -I$(srcdir)/../../include \
 	-I$(srcdir)/../../elfcpp \
 	-DLOCALEDIR="\"$(datadir)/locale\"" \

gold/testsuite/Makefile.in

@@ -545,7 +545,7 @@ AUTOMAKE_OPTIONS =
 # it on.  This may need to be controlled by a configure option
 # eventually.
 AM_CXXFLAGS = $(WARN_CXXFLAGS) $(LFS_CXXFLAGS) -fmerge-constants
-INCLUDES = -D_GNU_SOURCE \
+INCLUDES = \
 	-I$(srcdir) -I$(srcdir)/.. -I$(srcdir)/../../include \
 	-I$(srcdir)/../../elfcpp \
 	-DLOCALEDIR="\"$(datadir)/locale\"" \