libgo: Use stat_atim.go on Solaris 12+

From Rainer Orth.
    
    Solaris 12 changes the stat_[amc]tim members of struct stat from
    timestruc_t to timespec_t for XPG7 compatiblity, thus breaking the libgo
    build.  The following patch checks for this change and uses the common
    stat_atim.go if appropriate.
    
    Reviewed-on: https://go-review.googlesource.com/14495

From-SVN: r227665

gcc/go/gofrontend/MERGE

@@ -1,4 +1,4 @@
-7ba569544420d1de0eb607707ced6d23f8865186
+9bac6243d2252b2d043243d6ab1123ba7e90fa53
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/Makefile.am

@@ -880,7 +880,11 @@ endif
 endif
 
 if LIBGO_IS_SOLARIS
+if HAVE_STAT_TIMESPEC
+go_os_stat_file = go/os/stat_atim.go
+else
 go_os_stat_file = go/os/stat_solaris.go
+endif
 else
 if LIBGO_IS_LINUX
 go_os_stat_file = go/os/stat_atim.go

libgo/Makefile.in

@@ -1107,6 +1107,8 @@ go_netgo_files = \
 @LIBGO_IS_DARWIN_FALSE@@LIBGO_IS_FREEBSD_FALSE@go_os_cloexec_file = go/os/sys_unix.go
 @LIBGO_IS_DARWIN_TRUE@@LIBGO_IS_FREEBSD_FALSE@go_os_cloexec_file = go/os/sys_darwin.go
 @LIBGO_IS_FREEBSD_TRUE@go_os_cloexec_file = go/os/sys_freebsd.go
+@HAVE_STAT_TIMESPEC_FALSE@@LIBGO_IS_SOLARIS_TRUE@go_os_stat_file = go/os/stat_solaris.go
+@HAVE_STAT_TIMESPEC_TRUE@@LIBGO_IS_SOLARIS_TRUE@go_os_stat_file = go/os/stat_atim.go
 @LIBGO_IS_DARWIN_FALSE@@LIBGO_IS_DRAGONFLY_FALSE@@LIBGO_IS_FREEBSD_FALSE@@LIBGO_IS_LINUX_FALSE@@LIBGO_IS_NETBSD_FALSE@@LIBGO_IS_OPENBSD_FALSE@@LIBGO_IS_SOLARIS_FALSE@go_os_stat_file = go/os/stat.go
 @LIBGO_IS_DARWIN_FALSE@@LIBGO_IS_DRAGONFLY_TRUE@@LIBGO_IS_FREEBSD_FALSE@@LIBGO_IS_LINUX_FALSE@@LIBGO_IS_NETBSD_FALSE@@LIBGO_IS_OPENBSD_FALSE@@LIBGO_IS_SOLARIS_FALSE@go_os_stat_file = go/os/stat_dragonfly.go
 @LIBGO_IS_DARWIN_FALSE@@LIBGO_IS_FREEBSD_FALSE@@LIBGO_IS_LINUX_FALSE@@LIBGO_IS_NETBSD_TRUE@@LIBGO_IS_OPENBSD_FALSE@@LIBGO_IS_SOLARIS_FALSE@go_os_stat_file = go/os/stat_atimespec.go
@@ -1114,7 +1116,6 @@ go_netgo_files = \
 @LIBGO_IS_DARWIN_TRUE@@LIBGO_IS_LINUX_FALSE@@LIBGO_IS_OPENBSD_FALSE@@LIBGO_IS_SOLARIS_FALSE@go_os_stat_file = go/os/stat_atimespec.go
 @LIBGO_IS_LINUX_FALSE@@LIBGO_IS_OPENBSD_TRUE@@LIBGO_IS_SOLARIS_FALSE@go_os_stat_file = go/os/stat_atim.go
 @LIBGO_IS_LINUX_TRUE@@LIBGO_IS_SOLARIS_FALSE@go_os_stat_file = go/os/stat_atim.go
-@LIBGO_IS_SOLARIS_TRUE@go_os_stat_file = go/os/stat_solaris.go
 @LIBGO_IS_LINUX_FALSE@go_os_pipe_file = go/os/pipe_bsd.go
 @LIBGO_IS_LINUX_TRUE@go_os_pipe_file = go/os/pipe_linux.go
 go_os_files = \

libgo/configure

@@ -602,6 +602,8 @@ ac_subst_vars='am__EXEEXT_FALSE
 am__EXEEXT_TRUE
 LTLIBOBJS
 LIBOBJS
+HAVE_STAT_TIMESPEC_FALSE
+HAVE_STAT_TIMESPEC_TRUE
 STRUCT_EPOLL_EVENT_FD_OFFSET
 SIZEOF_STRUCT_EPOLL_EVENT
 MATH_FLAG
@@ -11118,7 +11120,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11121 "configure"
+#line 11123 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11224,7 +11226,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11227 "configure"
+#line 11229 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -15076,6 +15078,28 @@ $as_echo "$libgo_cv_c_epoll_event_fd_offset" >&6; }
 STRUCT_EPOLL_EVENT_FD_OFFSET=${libgo_cv_c_epoll_event_fd_offset}
 
 
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <sys/stat.h>
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "timespec_t.*st_atim" >/dev/null 2>&1; then :
+  have_stat_timespec=yes
+else
+  have_stat_timespec=no
+fi
+rm -f conftest*
+
+ if test $have_stat_timespec = yes; then
+  HAVE_STAT_TIMESPEC_TRUE=
+  HAVE_STAT_TIMESPEC_FALSE='#'
+else
+  HAVE_STAT_TIMESPEC_TRUE='#'
+  HAVE_STAT_TIMESPEC_FALSE=
+fi
+
+
 ac_fn_c_check_type "$LINENO" "struct exception" "ac_cv_type_struct_exception" "#include <math.h>
 "
 if test "x$ac_cv_type_struct_exception" = x""yes; then :
@@ -15696,6 +15720,10 @@ if test -z "${HAVE_WAIT4_TRUE}" && test -z "${HAVE_WAIT4_FALSE}"; then
   as_fn_error "conditional \"HAVE_WAIT4\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${HAVE_STAT_TIMESPEC_TRUE}" && test -z "${HAVE_STAT_TIMESPEC_FALSE}"; then
+  as_fn_error "conditional \"HAVE_STAT_TIMESPEC\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 
 : ${CONFIG_STATUS=./config.status}
 ac_write_fail=0

libgo/configure.ac

@@ -645,6 +645,12 @@ AC_CACHE_CHECK([epoll_event data.fd offset],
 STRUCT_EPOLL_EVENT_FD_OFFSET=${libgo_cv_c_epoll_event_fd_offset}
 AC_SUBST(STRUCT_EPOLL_EVENT_FD_OFFSET)
 
+dnl Check if <sys/stat.h> uses timespec_t for st_?tim members.  Introduced
+dnl in Solaris 12 for XPG7 compatibility.
+AC_EGREP_HEADER([timespec_t.*st_atim], [sys/stat.h],
+		[have_stat_timespec=yes], [have_stat_timespec=no])
+AM_CONDITIONAL(HAVE_STAT_TIMESPEC, test $have_stat_timespec = yes)
+
 dnl See if struct exception is defined in <math.h>.
 AC_CHECK_TYPE([struct exception],
 [libgo_has_struct_exception=yes],