2 dnl * If we have gettimeofday;
3 dnl * If we have struct timezone for use in calling it;
4 dnl * If calling it with a timezone pointer actually works -- this is deemed
5 dnl obsolete or undefined on some systems which say you should use a null
6 dnl pointer -- and undefine HAVE_TIMEZONE if so;
7 dnl * Whether it only takes one arg.
8 AC_DEFUN([LIBGFOR_GETTIMEOFDAY], [
9 AC_CHECK_FUNCS(gettimeofday)
10 if test "$ac_cv_func_gettimeofday" = yes; then
11 AC_CACHE_CHECK([for struct timezone], gfor_cv_struct_timezone,
12 [AC_TRY_COMPILE([#include <sys/time.h>],
13 [struct timezone tz;],
14 gfor_cv_struct_timezone=yes, gfor_cv_struct_timezone=no)])
15 if test $gfor_cv_struct_timezone = yes; then
16 dnl It may be that we can't call gettimeofday with a non-null pointer.
17 dnl In that case we'll lie about struct timezone.
19 #ifdef TIME_WITH_SYS_TIME
23 #ifdef HAVE_SYS_TIME_H
32 struct timezone dummy;
33 if (gettimeofday (&time, &dummy))
38 [gfor_have_struct_timezone=yes], [gfor_have_struct_timezone=no],
39 [gfor_have_struct_timezone=yes])
40 if test $gfor_have_struct_timezone = yes; then
41 AC_DEFINE(HAVE_TIMEZONE, 1, [Do we have struct timezone])
44 AC_REQUIRE([AC_HEADER_TIME])
45 AC_CACHE_CHECK([whether gettimeofday can accept two arguments],
46 emacs_cv_gettimeofday_two_arguments,
48 #ifdef TIME_WITH_SYS_TIME
52 #ifdef HAVE_SYS_TIME_H
62 struct timezone dummy;
67 gettimeofday (&time, DUMMY);],
68 emacs_cv_gettimeofday_two_arguments=yes,
69 emacs_cv_gettimeofday_two_arguments=no)])
70 if test $emacs_cv_gettimeofday_two_arguments = no; then
71 AC_DEFINE(GETTIMEOFDAY_ONE_ARGUMENT, 1,
72 [Does gettimeofday take a single argument])
76 sinclude(../libtool.m4)
77 dnl The lines below arrange for aclocal not to bring an installed
78 dnl libtool.m4 into aclocal.m4, while still arranging for automake to
79 dnl add a definition of LIBTOOL to Makefile.in.
80 ifelse(,,,[AC_SUBST(LIBTOOL)
81 AC_DEFUN([AM_PROG_LIBTOOL])
82 AC_DEFUN([AC_LIBTOOL_DLOPEN])
83 AC_DEFUN([AC_PROG_LD])
86 dnl Check whether the target is ILP32.
87 AC_DEFUN([LIBGFOR_TARGET_ILP32], [
88 AC_CACHE_CHECK([whether the target is ILP32], target_ilp32, [
92 if (sizeof(int) == 4 && sizeof(long) == 4 && sizeof(void *) == 4)
95 undefined_function ();
99 CFLAGS="$save_CFLAGS"])
100 if test $target_ilp32 = yes; then
101 AC_DEFINE(TARGET_ILP32, 1,
102 [Define to 1 if the target is ILP32.])
106 dnl Check whether the target supports hidden visibility.
107 AC_DEFUN([LIBGFOR_CHECK_ATTRIBUTE_VISIBILITY], [
108 AC_CACHE_CHECK([whether the target supports hidden visibility],
109 have_attribute_visibility, [
110 save_CFLAGS="$CFLAGS"
111 CFLAGS="$CFLAGS -Werror"
112 AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
113 [], have_attribute_visibility=yes,
114 have_attribute_visibility=no)
115 CFLAGS="$save_CFLAGS"])
116 if test $have_attribute_visibility = yes; then
117 AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1,
118 [Define to 1 if the target supports __attribute__((visibility(...))).])
121 dnl Check whether the target supports dllexport
122 AC_DEFUN([LIBGFOR_CHECK_ATTRIBUTE_DLLEXPORT], [
123 AC_CACHE_CHECK([whether the target supports dllexport],
124 have_attribute_dllexport, [
125 save_CFLAGS="$CFLAGS"
126 CFLAGS="$CFLAGS -Werror"
127 AC_TRY_COMPILE([void __attribute__((dllexport)) foo(void) { }],
128 [], have_attribute_dllexport=yes,
129 have_attribute_dllexport=no)
130 CFLAGS="$save_CFLAGS"])
131 if test $have_attribute_dllexport = yes; then
132 AC_DEFINE(HAVE_ATTRIBUTE_DLLEXPORT, 1,
133 [Define to 1 if the target supports __attribute__((dllexport)).])
136 dnl Check whether the target supports symbol aliases.
137 AC_DEFUN([LIBGFOR_CHECK_ATTRIBUTE_ALIAS], [
138 AC_CACHE_CHECK([whether the target supports symbol aliases],
139 have_attribute_alias, [
141 #define ULP STR1(__USER_LABEL_PREFIX__)
142 #define STR1(x) STR2(x)
145 extern void bar(void) __attribute__((alias(ULP "foo")));],
146 [bar();], have_attribute_alias=yes, have_attribute_alias=no)])
147 if test $have_attribute_alias = yes; then
148 AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1,
149 [Define to 1 if the target supports __attribute__((alias(...))).])