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111
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1 dnl
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2 dnl Unconditionally define a preprocessor macro, translating the shell
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|
3 dnl macro from yes/no to 1/0.
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4 dnl
|
|
|
5 AC_DEFUN([LIBAT_DEFINE_YESNO], [
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|
6 yesno=`echo $2 | tr 'yesno' '1 0 '`
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7 AC_DEFINE_UNQUOTED([$1], $yesno, [$3])
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|
8 ])
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9 dnl
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10 dnl Iterate over all of the modes we're prepared to check.
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11 dnl
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12 AC_DEFUN([LIBAT_FORALL_MODES],
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13 [$1(QI,1)
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14 $1(HI,2)
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15 $1(SI,4)
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16 $1(DI,8)
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17 $1(TI,16)]
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18 )
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19 dnl
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20 dnl Check for builtin types by mode.
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21 dnl
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22 dnl A less interesting of size checking than autoconf normally provides.
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23 dnl We know that gcc always provides <stdint.h>, but we don't often
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24 dnl provide a builtin type for TImode.
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25 dnl
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26 AC_DEFUN([LIBAT_HAVE_INT_MODE],[
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27 AC_CACHE_CHECK([for $2 byte integer],[libat_cv_have_mode_$1],
|
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145
|
28 [AC_COMPILE_IFELSE([AC_LANG_SOURCE([int x __attribute__((mode($1)));])],
|
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111
|
29 [libat_cv_have_mode_$1=yes],[libat_cv_have_mode_$1=no])])
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30 LIBAT_DEFINE_YESNO([HAVE_INT$2], [$libat_cv_have_mode_$1],
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31 [Have support for $2 byte integers.])
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32 if test x$libat_cv_have_mode_$1 = xyes; then
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33 SIZES="$SIZES $2"
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34 fi
|
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35 ])
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36 dnl
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37 dnl Check for atomic builtins.
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38 dnl See:
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39 dnl http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
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40 dnl
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41 dnl This checks to see if the host supports the compiler-generated
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42 dnl builtins for atomic operations for various integral sizes.
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43 dnl
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44 AC_DEFUN([LIBAT_TEST_ATOMIC_INIT],[
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45 # Do link tests if possible, instead asm tests, limited to some platforms
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46 # see discussion in PR target/40134, PR libstdc++/40133 and the thread
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47 # starting at http://gcc.gnu.org/ml/gcc-patches/2009-07/msg00322.html
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48 atomic_builtins_link_tests=no
|
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49 if test x$gcc_no_link != xyes; then
|
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50 # Can do link tests. Limit to some tested platforms
|
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51 case "$host" in
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52 *-*-linux* | *-*-uclinux* | *-*-kfreebsd*-gnu | *-*-gnu*)
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53 atomic_builtins_link_tests=yes
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54 ;;
|
|
|
55 esac
|
|
|
56 fi
|
|
|
57 ])
|
|
|
58 AC_DEFUN([LIBAT_TEST_ATOMIC_BUILTIN],[
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59 AC_CACHE_CHECK([$1],[$2],[
|
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60 AC_LANG_CONFTEST([AC_LANG_PROGRAM([],[$3])])
|
|
|
61 if test x$atomic_builtins_link_tests = xyes; then
|
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62 if AC_TRY_EVAL(ac_link); then
|
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63 eval $2=yes
|
|
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64 else
|
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65 eval $2=no
|
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|
66 fi
|
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|
67 else
|
|
|
68 old_CFLAGS="$CFLAGS"
|
|
|
69 # Compile unoptimized.
|
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|
70 CFLAGS="$CFLAGS -O0 -S"
|
|
|
71 if AC_TRY_EVAL(ac_compile); then
|
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72 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
|
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73 eval $2=no
|
|
|
74 else
|
|
|
75 eval $2=yes
|
|
|
76 fi
|
|
|
77 else
|
|
|
78 eval $2=no
|
|
|
79 fi
|
|
|
80 CFLAGS="$old_CFLAGS"
|
|
|
81 fi
|
|
|
82 rm -f conftest*
|
|
|
83 ])
|
|
|
84 ])
|
|
|
85
|
|
|
86 dnl
|
|
|
87 dnl Test if we have __atomic_load and __atomic_store for mode $1, size $2
|
|
|
88 dnl
|
|
|
89 AC_DEFUN([LIBAT_HAVE_ATOMIC_LOADSTORE],[
|
|
|
90 LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_load/store for size $2],
|
|
|
91 [libat_cv_have_at_ldst_$2],
|
|
|
92 [typedef int T __attribute__((mode($1)));
|
|
|
93 T *x; volatile T sink; asm("" : "=g"(x));
|
|
|
94 sink = __atomic_load_n(x, 0);
|
|
|
95 __atomic_store_n(x, sink, 0);])
|
|
|
96 LIBAT_DEFINE_YESNO([HAVE_ATOMIC_LDST_$2], [$libat_cv_have_at_ldst_$2],
|
|
|
97 [Have __atomic_load/store for $2 byte integers.])
|
|
|
98 AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_LDST_$2 HAVE_ATOMIC_LDST_$2])
|
|
|
99 AH_BOTTOM([#define FAST_ATOMIC_LDST_$2 HAVE_ATOMIC_LDST_$2])
|
|
|
100 ])
|
|
|
101
|
|
|
102 dnl
|
|
|
103 dnl Test if we have __atomic_test_and_set for mode $1, size $2
|
|
|
104 dnl
|
|
|
105 AC_DEFUN([LIBAT_HAVE_ATOMIC_TAS],[
|
|
|
106 LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_test_and_set for size $2],
|
|
|
107 [libat_cv_have_at_tas_$2],
|
|
|
108 [typedef int T __attribute__((mode($1))); T *x; asm("" : "=g"(x));
|
|
|
109 __atomic_test_and_set(x, 0);])
|
|
|
110 LIBAT_DEFINE_YESNO([HAVE_ATOMIC_TAS_$2], [$libat_cv_have_at_tas_$2],
|
|
|
111 [Have __atomic_test_and_set for $2 byte integers.])
|
|
|
112 AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_TAS_$2 HAVE_ATOMIC_TAS_$2])
|
|
|
113 ])
|
|
|
114
|
|
|
115 dnl
|
|
|
116 dnl Test if we have __atomic_exchange for mode $1, size $2
|
|
|
117 dnl
|
|
|
118 AC_DEFUN([LIBAT_HAVE_ATOMIC_EXCHANGE],[
|
|
|
119 LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_exchange for size $2],
|
|
|
120 [libat_cv_have_at_exch_$2],
|
|
|
121 [typedef int T __attribute__((mode($1))); T *x; asm("" : "=g"(x));
|
|
|
122 __atomic_exchange_n(x, 0, 0);])
|
|
|
123 LIBAT_DEFINE_YESNO([HAVE_ATOMIC_EXCHANGE_$2], [$libat_cv_have_at_exch_$2],
|
|
|
124 [Have __atomic_exchange for $2 byte integers.])
|
|
|
125 AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_EXCHANGE_$2 HAVE_ATOMIC_EXCHANGE_$2])
|
|
|
126 ])
|
|
|
127
|
|
|
128 dnl
|
|
|
129 dnl Test if we have __atomic_compare_exchange for mode $1, size $2
|
|
|
130 dnl
|
|
|
131 AC_DEFUN([LIBAT_HAVE_ATOMIC_CAS],[
|
|
|
132 LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_compare_exchange for size $2],
|
|
|
133 [libat_cv_have_at_cas_$2],
|
|
|
134 [typedef int T __attribute__((mode($1))); T *x, *y;
|
|
|
135 asm("" : "=g"(x), "=g"(y));
|
|
|
136 __atomic_compare_exchange_n(x, y, 0, 0, 0, 0);])
|
|
|
137 LIBAT_DEFINE_YESNO([HAVE_ATOMIC_CAS_$2], [$libat_cv_have_at_cas_$2],
|
|
|
138 [Have __atomic_compare_exchange for $2 byte integers.])
|
|
|
139 AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_CAS_$2 HAVE_ATOMIC_CAS_$2])
|
|
|
140 ])
|
|
|
141
|
|
|
142 dnl
|
|
|
143 dnl Test if we have __atomic_fetch_add for mode $1, size $2
|
|
|
144 dnl
|
|
|
145 AC_DEFUN([LIBAT_HAVE_ATOMIC_FETCH_ADD],[
|
|
|
146 LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_fetch_add for size $2],
|
|
|
147 [libat_cv_have_at_fadd_$2],
|
|
|
148 [typedef int T __attribute__((mode($1))); T *x, y;
|
|
|
149 asm("" : "=g"(x), "=g"(y));
|
|
|
150 __atomic_fetch_add (x, y, 0);
|
|
|
151 __atomic_add_fetch (x, y, 0);])
|
|
|
152 LIBAT_DEFINE_YESNO([HAVE_ATOMIC_FETCH_ADD_$2], [$libat_cv_have_at_fadd_$2],
|
|
|
153 [Have __atomic_fetch_add for $2 byte integers.])
|
|
|
154 AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_FETCH_ADD_$2 HAVE_ATOMIC_FETCH_ADD_$2])
|
|
|
155 ])
|
|
|
156
|
|
|
157 dnl
|
|
|
158 dnl Test if we have __atomic_fetch_op for all op for mode $1, size $2
|
|
|
159 dnl
|
|
|
160 AC_DEFUN([LIBAT_HAVE_ATOMIC_FETCH_OP],[
|
|
|
161 LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_fetch_op for size $2],
|
|
|
162 [libat_cv_have_at_fop_$2],
|
|
|
163 [typedef int T __attribute__((mode($1))); T *x, y;
|
|
|
164 asm("" : "=g"(x), "=g"(y));
|
|
|
165 __atomic_fetch_add (x, y, 0); __atomic_add_fetch (x, y, 0);
|
|
|
166 __atomic_fetch_sub (x, y, 0); __atomic_sub_fetch (x, y, 0);
|
|
|
167 __atomic_fetch_and (x, y, 0); __atomic_and_fetch (x, y, 0);
|
|
|
168 __atomic_fetch_nand (x, y, 0); __atomic_nand_fetch (x, y, 0);
|
|
|
169 __atomic_fetch_xor (x, y, 0); __atomic_xor_fetch (x, y, 0);
|
|
|
170 __atomic_fetch_or (x, y, 0); __atomic_or_fetch (x, y, 0); ])
|
|
|
171 LIBAT_DEFINE_YESNO([HAVE_ATOMIC_FETCH_OP_$2], [$libat_cv_have_at_fop_$2],
|
|
|
172 [Have __atomic_fetch_op for all op for $2 byte integers.])
|
|
|
173 AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_FETCH_OP_$2 HAVE_ATOMIC_FETCH_OP_$2])
|
|
|
174 ])
|
|
|
175
|
|
|
176 dnl
|
|
|
177 dnl Test for the size of the target word.
|
|
|
178 dnl
|
|
|
179 AC_DEFUN([LIBAT_WORDSIZE],[
|
|
|
180 AC_CACHE_CHECK([for the word size],[libat_cv_wordsize],
|
|
|
181 [AC_COMPUTE_INT(libat_cv_wordsize,
|
|
|
182 [sizeof(word)], [typedef int word __attribute__((mode(word)));],
|
|
|
183 AC_ERROR([Could not determine word size.]))])
|
|
|
184 AC_DEFINE_UNQUOTED(WORDSIZE, $libat_cv_wordsize,
|
|
|
185 [The word size in bytes of the machine.])
|
|
|
186 ])
|
|
|
187
|
|
|
188 dnl
|
|
|
189 dnl Check whether the target supports the ifunc attribute.
|
|
|
190 dnl
|
|
|
191 AC_DEFUN([LIBAT_CHECK_IFUNC], [
|
|
|
192 AC_CACHE_CHECK([whether the target supports the ifunc attribute],
|
|
|
193 libat_cv_have_ifunc, [
|
|
|
194 save_CFLAGS="$CFLAGS"
|
|
|
195 CFLAGS="$CFLAGS -Werror"
|
|
|
196 AC_TRY_LINK([
|
|
|
197 int foo_alt(void) { return 0; }
|
|
|
198 typedef int F (void);
|
|
|
199 F *foo_sel(void) { return foo_alt; }
|
|
|
200 int foo(void) __attribute__((ifunc("foo_sel")));],
|
|
|
201 [return foo();], libat_cv_have_ifunc=yes, libat_cv_have_ifunc=no)])
|
|
|
202 LIBAT_DEFINE_YESNO([HAVE_IFUNC], [$libat_cv_have_ifunc],
|
|
|
203 [Define to 1 if the target supports __attribute__((ifunc(...))).])
|
|
|
204 ])
|
|
|
205
|
|
|
206 dnl ----------------------------------------------------------------------
|
|
|
207 dnl This whole bit snagged from libitm.
|
|
|
208
|
|
|
209 dnl Check whether the target supports hidden visibility.
|
|
|
210 AC_DEFUN([LIBAT_CHECK_ATTRIBUTE_VISIBILITY], [
|
|
|
211 AC_CACHE_CHECK([whether the target supports hidden visibility],
|
|
|
212 libat_cv_have_attribute_visibility, [
|
|
|
213 save_CFLAGS="$CFLAGS"
|
|
|
214 CFLAGS="$CFLAGS -Werror"
|
|
|
215 AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
|
|
|
216 [], libat_cv_have_attribute_visibility=yes,
|
|
|
217 libat_cv_have_attribute_visibility=no)
|
|
|
218 CFLAGS="$save_CFLAGS"])
|
|
|
219 if test $libat_cv_have_attribute_visibility = yes; then
|
|
|
220 AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1,
|
|
|
221 [Define to 1 if the target supports __attribute__((visibility(...))).])
|
|
|
222 fi])
|
|
|
223
|
|
|
224 dnl Check whether the target supports dllexport
|
|
|
225 AC_DEFUN([LIBAT_CHECK_ATTRIBUTE_DLLEXPORT], [
|
|
|
226 AC_CACHE_CHECK([whether the target supports dllexport],
|
|
|
227 libat_cv_have_attribute_dllexport, [
|
|
|
228 save_CFLAGS="$CFLAGS"
|
|
|
229 CFLAGS="$CFLAGS -Werror"
|
|
|
230 AC_TRY_COMPILE([void __attribute__((dllexport)) foo(void) { }],
|
|
|
231 [], libat_cv_have_attribute_dllexport=yes,
|
|
|
232 libat_cv_have_attribute_dllexport=no)
|
|
|
233 CFLAGS="$save_CFLAGS"])
|
|
|
234 if test $libat_cv_have_attribute_dllexport = yes; then
|
|
|
235 AC_DEFINE(HAVE_ATTRIBUTE_DLLEXPORT, 1,
|
|
|
236 [Define to 1 if the target supports __attribute__((dllexport)).])
|
|
|
237 fi])
|
|
|
238
|
|
|
239 dnl Check whether the target supports symbol aliases.
|
|
|
240 AC_DEFUN([LIBAT_CHECK_ATTRIBUTE_ALIAS], [
|
|
|
241 AC_CACHE_CHECK([whether the target supports symbol aliases],
|
|
|
242 libat_cv_have_attribute_alias, [
|
|
|
243 AC_TRY_LINK([
|
|
|
244 void foo(void) { }
|
|
|
245 extern void bar(void) __attribute__((alias("foo")));],
|
|
|
246 [bar();], libat_cv_have_attribute_alias=yes, libat_cv_have_attribute_alias=no)])
|
|
|
247 if test $libat_cv_have_attribute_alias = yes; then
|
|
|
248 AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1,
|
|
|
249 [Define to 1 if the target supports __attribute__((alias(...))).])
|
|
|
250 fi])
|
|
|
251
|
|
|
252 dnl ----------------------------------------------------------------------
|
|
|
253 dnl This whole bit snagged from libstdc++-v3.
|
|
|
254
|
|
|
255 dnl
|
|
|
256 dnl LIBAT_ENABLE
|
|
|
257 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
|
|
|
258 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
|
|
|
259 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
|
|
|
260 dnl
|
|
|
261 dnl See docs/html/17_intro/configury.html#enable for documentation.
|
|
|
262 dnl
|
|
|
263 m4_define([LIBAT_ENABLE],[dnl
|
|
|
264 m4_define([_g_switch],[--enable-$1])dnl
|
|
|
265 m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl
|
|
|
266 AC_ARG_ENABLE($1,_g_help,
|
|
|
267 m4_bmatch([$5],
|
|
|
268 [^permit ],
|
|
|
269 [[
|
|
|
270 case "$enableval" in
|
|
|
271 m4_bpatsubst([$5],[permit ])) ;;
|
|
|
272 *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
|
|
|
273 dnl Idea for future: generate a URL pointing to
|
|
|
274 dnl "onlinedocs/configopts.html#whatever"
|
|
|
275 esac
|
|
|
276 ]],
|
|
|
277 [^$],
|
|
|
278 [[
|
|
|
279 case "$enableval" in
|
|
|
280 yes|no) ;;
|
|
|
281 *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
|
|
|
282 esac
|
|
|
283 ]],
|
|
|
284 [[$5]]),
|
|
|
285 [enable_]m4_bpatsubst([$1],-,_)[=][$2])
|
|
|
286 m4_undefine([_g_switch])dnl
|
|
|
287 m4_undefine([_g_help])dnl
|
|
|
288 ])
|
|
|
289
|
|
|
290 dnl
|
|
|
291 dnl If GNU ld is in use, check to see if tricky linker opts can be used. If
|
|
|
292 dnl the native linker is in use, all variables will be defined to something
|
|
|
293 dnl safe (like an empty string).
|
|
|
294 dnl
|
|
|
295 dnl Defines:
|
|
|
296 dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible
|
|
|
297 dnl OPT_LDFLAGS='-Wl,-O1' if possible
|
|
|
298 dnl LD (as a side effect of testing)
|
|
|
299 dnl Sets:
|
|
|
300 dnl with_gnu_ld
|
|
|
301 dnl libat_ld_is_gold (possibly)
|
|
|
302 dnl libat_gnu_ld_version (possibly)
|
|
|
303 dnl
|
|
|
304 dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
|
|
|
305 dnl set libat_gnu_ld_version to 12345. Zeros cause problems.
|
|
|
306 dnl
|
|
|
307 AC_DEFUN([LIBAT_CHECK_LINKER_FEATURES], [
|
|
|
308 # If we're not using GNU ld, then there's no point in even trying these
|
|
|
309 # tests. Check for that first. We should have already tested for gld
|
|
|
310 # by now (in libtool), but require it now just to be safe...
|
|
|
311 test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
|
|
|
312 test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
|
|
|
313 AC_REQUIRE([AC_PROG_LD])
|
|
|
314 AC_REQUIRE([AC_PROG_AWK])
|
|
|
315
|
|
|
316 # The name set by libtool depends on the version of libtool. Shame on us
|
|
|
317 # for depending on an impl detail, but c'est la vie. Older versions used
|
|
|
318 # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
|
|
|
319 # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
|
|
|
320 # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't
|
|
|
321 # set (hence we're using an older libtool), then set it.
|
|
|
322 if test x${with_gnu_ld+set} != xset; then
|
|
|
323 if test x${ac_cv_prog_gnu_ld+set} != xset; then
|
|
|
324 # We got through "ac_require(ac_prog_ld)" and still not set? Huh?
|
|
|
325 with_gnu_ld=no
|
|
|
326 else
|
|
|
327 with_gnu_ld=$ac_cv_prog_gnu_ld
|
|
|
328 fi
|
|
|
329 fi
|
|
|
330
|
|
|
331 # Start by getting the version number. I think the libtool test already
|
|
|
332 # does some of this, but throws away the result.
|
|
|
333 libat_ld_is_gold=no
|
|
|
334 if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then
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|
335 libat_ld_is_gold=yes
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|
|
336 fi
|
|
|
337 changequote(,)
|
|
|
338 ldver=`$LD --version 2>/dev/null |
|
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145
|
339 sed -e 's/[. ][0-9]\{8\}$//;s/.* \([^ ]\{1,\}\)$/\1/; q'`
|
|
111
|
340 changequote([,])
|
|
|
341 libat_gnu_ld_version=`echo $ldver | \
|
|
|
342 $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
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343
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344 # Set --gc-sections.
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345 if test "$with_gnu_ld" = "notbroken"; then
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346 # GNU ld it is! Joy and bunny rabbits!
|
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347
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348 # All these tests are for C++; save the language and the compiler flags.
|
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349 # Need to do this so that g++ won't try to link in libstdc++
|
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|
350 ac_test_CFLAGS="${CFLAGS+set}"
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|
351 ac_save_CFLAGS="$CFLAGS"
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352 CFLAGS='-x c++ -Wl,--gc-sections'
|
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353
|
|
|
354 # Check for -Wl,--gc-sections
|
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|
355 # XXX This test is broken at the moment, as symbols required for linking
|
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|
356 # are now in libsupc++ (not built yet). In addition, this test has
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357 # cored on solaris in the past. In addition, --gc-sections doesn't
|
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358 # really work at the moment (keeps on discarding used sections, first
|
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359 # .eh_frame and now some of the glibc sections for iconv).
|
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360 # Bzzzzt. Thanks for playing, maybe next time.
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361 AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
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362 AC_TRY_RUN([
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363 int main(void)
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364 {
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365 try { throw 1; }
|
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366 catch (...) { };
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367 return 0;
|
|
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368 }
|
|
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369 ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes])
|
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370 if test "$ac_test_CFLAGS" = set; then
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371 CFLAGS="$ac_save_CFLAGS"
|
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372 else
|
|
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373 # this is the suspicious part
|
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374 CFLAGS=''
|
|
|
375 fi
|
|
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376 if test "$ac_sectionLDflags" = "yes"; then
|
|
|
377 SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
|
|
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378 fi
|
|
|
379 AC_MSG_RESULT($ac_sectionLDflags)
|
|
|
380 fi
|
|
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381
|
|
|
382 # Set linker optimization flags.
|
|
|
383 if test x"$with_gnu_ld" = x"yes"; then
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|
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384 OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
|
|
|
385 fi
|
|
|
386
|
|
|
387 AC_SUBST(SECTION_LDFLAGS)
|
|
|
388 AC_SUBST(OPT_LDFLAGS)
|
|
|
389 ])
|
|
|
390
|
|
|
391
|
|
|
392 dnl
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393 dnl If GNU ld is in use, check to see if tricky linker opts can be used. If
|
|
|
394 dnl the native linker is in use, all variables will be defined to something
|
|
|
395 dnl safe (like an empty string).
|
|
|
396 dnl
|
|
|
397 dnl Defines:
|
|
|
398 dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible
|
|
|
399 dnl OPT_LDFLAGS='-Wl,-O1' if possible
|
|
|
400 dnl LD (as a side effect of testing)
|
|
|
401 dnl Sets:
|
|
|
402 dnl with_gnu_ld
|
|
|
403 dnl libat_ld_is_gold (possibly)
|
|
|
404 dnl libat_gnu_ld_version (possibly)
|
|
|
405 dnl
|
|
|
406 dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
|
|
|
407 dnl set libat_gnu_ld_version to 12345. Zeros cause problems.
|
|
|
408 dnl
|
|
|
409 AC_DEFUN([LIBAT_CHECK_LINKER_FEATURES], [
|
|
|
410 # If we're not using GNU ld, then there's no point in even trying these
|
|
|
411 # tests. Check for that first. We should have already tested for gld
|
|
|
412 # by now (in libtool), but require it now just to be safe...
|
|
|
413 test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
|
|
|
414 test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
|
|
|
415 AC_REQUIRE([AC_PROG_LD])
|
|
|
416 AC_REQUIRE([AC_PROG_AWK])
|
|
|
417
|
|
|
418 # The name set by libtool depends on the version of libtool. Shame on us
|
|
|
419 # for depending on an impl detail, but c'est la vie. Older versions used
|
|
|
420 # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
|
|
|
421 # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
|
|
|
422 # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't
|
|
|
423 # set (hence we're using an older libtool), then set it.
|
|
|
424 if test x${with_gnu_ld+set} != xset; then
|
|
|
425 if test x${ac_cv_prog_gnu_ld+set} != xset; then
|
|
|
426 # We got through "ac_require(ac_prog_ld)" and still not set? Huh?
|
|
|
427 with_gnu_ld=no
|
|
|
428 else
|
|
|
429 with_gnu_ld=$ac_cv_prog_gnu_ld
|
|
|
430 fi
|
|
|
431 fi
|
|
|
432
|
|
|
433 # Start by getting the version number. I think the libtool test already
|
|
|
434 # does some of this, but throws away the result.
|
|
|
435 libat_ld_is_gold=no
|
|
|
436 if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then
|
|
|
437 libat_ld_is_gold=yes
|
|
|
438 fi
|
|
|
439 changequote(,)
|
|
|
440 ldver=`$LD --version 2>/dev/null |
|
|
145
|
441 sed -e 's/[. ][0-9]\{8\}$//;s/.* \([^ ]\{1,\}\)$/\1/; q'`
|
|
111
|
442 changequote([,])
|
|
|
443 libat_gnu_ld_version=`echo $ldver | \
|
|
|
444 $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
|
|
|
445
|
|
|
446 # Set --gc-sections.
|
|
|
447 if test "$with_gnu_ld" = "notbroken"; then
|
|
|
448 # GNU ld it is! Joy and bunny rabbits!
|
|
|
449
|
|
|
450 # All these tests are for C++; save the language and the compiler flags.
|
|
|
451 # Need to do this so that g++ won't try to link in libstdc++
|
|
|
452 ac_test_CFLAGS="${CFLAGS+set}"
|
|
|
453 ac_save_CFLAGS="$CFLAGS"
|
|
|
454 CFLAGS='-x c++ -Wl,--gc-sections'
|
|
|
455
|
|
|
456 # Check for -Wl,--gc-sections
|
|
|
457 # XXX This test is broken at the moment, as symbols required for linking
|
|
|
458 # are now in libsupc++ (not built yet). In addition, this test has
|
|
|
459 # cored on solaris in the past. In addition, --gc-sections doesn't
|
|
|
460 # really work at the moment (keeps on discarding used sections, first
|
|
|
461 # .eh_frame and now some of the glibc sections for iconv).
|
|
|
462 # Bzzzzt. Thanks for playing, maybe next time.
|
|
|
463 AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
|
|
|
464 AC_TRY_RUN([
|
|
|
465 int main(void)
|
|
|
466 {
|
|
|
467 try { throw 1; }
|
|
|
468 catch (...) { };
|
|
|
469 return 0;
|
|
|
470 }
|
|
|
471 ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes])
|
|
|
472 if test "$ac_test_CFLAGS" = set; then
|
|
|
473 CFLAGS="$ac_save_CFLAGS"
|
|
|
474 else
|
|
|
475 # this is the suspicious part
|
|
|
476 CFLAGS=''
|
|
|
477 fi
|
|
|
478 if test "$ac_sectionLDflags" = "yes"; then
|
|
|
479 SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
|
|
|
480 fi
|
|
|
481 AC_MSG_RESULT($ac_sectionLDflags)
|
|
|
482 fi
|
|
|
483
|
|
|
484 # Set linker optimization flags.
|
|
|
485 if test x"$with_gnu_ld" = x"yes"; then
|
|
|
486 OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
|
|
|
487 fi
|
|
|
488
|
|
|
489 AC_SUBST(SECTION_LDFLAGS)
|
|
|
490 AC_SUBST(OPT_LDFLAGS)
|
|
|
491 ])
|
|
|
492
|
|
|
493
|
|
|
494 dnl
|
|
|
495 dnl Add version tags to symbols in shared library (or not), additionally
|
|
|
496 dnl marking other symbols as private/local (or not).
|
|
|
497 dnl
|
|
|
498 dnl --enable-symvers=style adds a version script to the linker call when
|
|
|
499 dnl creating the shared library. The choice of version script is
|
|
|
500 dnl controlled by 'style'.
|
|
|
501 dnl --disable-symvers does not.
|
|
|
502 dnl + Usage: LIBAT_ENABLE_SYMVERS[(DEFAULT)]
|
|
|
503 dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
|
|
|
504 dnl choose a default style based on linker characteristics. Passing
|
|
|
505 dnl 'no' disables versioning.
|
|
|
506 dnl
|
|
|
507 AC_DEFUN([LIBAT_ENABLE_SYMVERS], [
|
|
|
508
|
|
|
509 LIBAT_ENABLE(symvers,yes,[=STYLE],
|
|
|
510 [enables symbol versioning of the shared library],
|
|
|
511 [permit yes|no|gnu*|sun])
|
|
|
512
|
|
|
513 # If we never went through the LIBAT_CHECK_LINKER_FEATURES macro, then we
|
|
|
514 # don't know enough about $LD to do tricks...
|
|
|
515 AC_REQUIRE([LIBAT_CHECK_LINKER_FEATURES])
|
|
|
516
|
|
|
517 # Turn a 'yes' into a suitable default.
|
|
|
518 if test x$enable_symvers = xyes ; then
|
|
|
519 # FIXME The following test is too strict, in theory.
|
|
|
520 if test $enable_shared = no || test "x$LD" = x; then
|
|
|
521 enable_symvers=no
|
|
|
522 else
|
|
|
523 if test $with_gnu_ld = yes ; then
|
|
|
524 enable_symvers=gnu
|
|
|
525 else
|
|
|
526 case ${target_os} in
|
|
|
527 # Sun symbol versioning exists since Solaris 2.5.
|
|
|
528 solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
|
|
|
529 enable_symvers=sun ;;
|
|
|
530 *)
|
|
|
531 enable_symvers=no ;;
|
|
|
532 esac
|
|
|
533 fi
|
|
|
534 fi
|
|
|
535 fi
|
|
|
536
|
|
|
537 # Check if 'sun' was requested on non-Solaris 2 platforms.
|
|
|
538 if test x$enable_symvers = xsun ; then
|
|
|
539 case ${target_os} in
|
|
|
540 solaris2*)
|
|
|
541 # All fine.
|
|
|
542 ;;
|
|
|
543 *)
|
|
|
544 # Unlikely to work.
|
|
|
545 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
|
|
|
546 AC_MSG_WARN([=== you are not targetting Solaris 2.])
|
|
|
547 AC_MSG_WARN([=== Symbol versioning will be disabled.])
|
|
|
548 enable_symvers=no
|
|
|
549 ;;
|
|
|
550 esac
|
|
|
551 fi
|
|
|
552
|
|
|
553 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
|
|
|
554 if test $enable_symvers != no; then
|
|
|
555 AC_MSG_CHECKING([for shared libgcc])
|
|
|
556 ac_save_CFLAGS="$CFLAGS"
|
|
|
557 CFLAGS=' -lgcc_s'
|
|
|
558 AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes, libat_shared_libgcc=no)
|
|
|
559 CFLAGS="$ac_save_CFLAGS"
|
|
|
560 if test $libat_shared_libgcc = no; then
|
|
|
561 cat > conftest.c <<EOF
|
|
|
562 int main (void) { return 0; }
|
|
|
563 EOF
|
|
|
564 changequote(,)dnl
|
|
|
565 libat_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
|
|
|
566 -shared -shared-libgcc -o conftest.so \
|
|
|
567 conftest.c -v 2>&1 >/dev/null \
|
|
|
568 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
|
|
|
569 changequote([,])dnl
|
|
|
570 rm -f conftest.c conftest.so
|
|
|
571 if test x${libat_libgcc_s_suffix+set} = xset; then
|
|
|
572 CFLAGS=" -lgcc_s$libat_libgcc_s_suffix"
|
|
|
573 AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes)
|
|
|
574 CFLAGS="$ac_save_CFLAGS"
|
|
|
575 fi
|
|
|
576 fi
|
|
|
577 AC_MSG_RESULT($libat_shared_libgcc)
|
|
|
578 fi
|
|
|
579
|
|
|
580 # For GNU ld, we need at least this version. The format is described in
|
|
|
581 # LIBAT_CHECK_LINKER_FEATURES above.
|
|
|
582 libat_min_gnu_ld_version=21400
|
|
|
583 # XXXXXXXXXXX libat_gnu_ld_version=21390
|
|
|
584
|
|
|
585 # Check to see if unspecified "yes" value can win, given results above.
|
|
|
586 # Change "yes" into either "no" or a style name.
|
|
|
587 if test $enable_symvers != no && test $libat_shared_libgcc = yes; then
|
|
|
588 if test $with_gnu_ld = yes; then
|
|
|
589 if test $libat_gnu_ld_version -ge $libat_min_gnu_ld_version ; then
|
|
|
590 enable_symvers=gnu
|
|
|
591 elif test $libat_ld_is_gold = yes ; then
|
|
|
592 enable_symvers=gnu
|
|
|
593 else
|
|
|
594 # The right tools, the right setup, but too old. Fallbacks?
|
|
|
595 AC_MSG_WARN(=== Linker version $libat_gnu_ld_version is too old for)
|
|
|
596 AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
|
|
|
597 AC_MSG_WARN(=== You would need to upgrade your binutils to version)
|
|
|
598 AC_MSG_WARN(=== $libat_min_gnu_ld_version or later and rebuild GCC.)
|
|
|
599 if test $libat_gnu_ld_version -ge 21200 ; then
|
|
|
600 # Globbing fix is present, proper block support is not.
|
|
|
601 dnl AC_MSG_WARN([=== Dude, you are soooo close. Maybe we can fake it.])
|
|
|
602 dnl enable_symvers=???
|
|
|
603 AC_MSG_WARN([=== Symbol versioning will be disabled.])
|
|
|
604 enable_symvers=no
|
|
|
605 else
|
|
|
606 # 2.11 or older.
|
|
|
607 AC_MSG_WARN([=== Symbol versioning will be disabled.])
|
|
|
608 enable_symvers=no
|
|
|
609 fi
|
|
|
610 fi
|
|
|
611 elif test $enable_symvers = sun; then
|
|
|
612 : All interesting versions of Sun ld support sun style symbol versioning.
|
|
|
613 else
|
|
|
614 # just fail for now
|
|
|
615 AC_MSG_WARN([=== You have requested some kind of symbol versioning, but])
|
|
|
616 AC_MSG_WARN([=== either you are not using a supported linker, or you are])
|
|
|
617 AC_MSG_WARN([=== not building a shared libgcc_s (which is required).])
|
|
|
618 AC_MSG_WARN([=== Symbol versioning will be disabled.])
|
|
|
619 enable_symvers=no
|
|
|
620 fi
|
|
|
621 fi
|
|
|
622 if test $enable_symvers = gnu; then
|
|
|
623 AC_DEFINE(LIBAT_GNU_SYMBOL_VERSIONING, 1,
|
|
|
624 [Define to 1 if GNU symbol versioning is used for libatomic.])
|
|
|
625 fi
|
|
|
626
|
|
|
627 AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB, test $enable_symvers != no)
|
|
|
628 AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB_GNU, test $enable_symvers = gnu)
|
|
|
629 AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB_SUN, test $enable_symvers = sun)
|
|
|
630 AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
|
|
|
631 ])
|
|
|
632
|
|
|
633 dnl ----------------------------------------------------------------------
|
|
|
634 sinclude(../libtool.m4)
|
|
131
|
635 sinclude(../config/enable.m4)
|
|
|
636 sinclude(../config/cet.m4)
|
|
111
|
637 dnl The lines below arrange for aclocal not to bring an installed
|
|
|
638 dnl libtool.m4 into aclocal.m4, while still arranging for automake to
|
|
|
639 dnl add a definition of LIBTOOL to Makefile.in.
|
|
|
640 ifelse(,,,[AC_SUBST(LIBTOOL)
|
|
|
641 AC_DEFUN([AM_PROG_LIBTOOL])
|
|
|
642 AC_DEFUN([AC_LIBTOOL_DLOPEN])
|
|
|
643 AC_DEFUN([AC_PROG_LD])
|
|
|
644 ])
|
