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1 dnl ----------------------------------------------------------------------
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2 dnl This whole bit snagged from libgfortran.
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3
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4 dnl Check whether the target supports __sync_*_compare_and_swap.
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5 AC_DEFUN([LIBGOMP_CHECK_SYNC_BUILTINS], [
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6 AC_CACHE_CHECK([whether the target supports __sync_*_compare_and_swap],
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7 libgomp_cv_have_sync_builtins, [
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8 AC_TRY_LINK([], [int foo, bar; bar = __sync_val_compare_and_swap(&foo, 0, 1);],
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9 libgomp_cv_have_sync_builtins=yes, libgomp_cv_have_sync_builtins=no)])
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10 if test $libgomp_cv_have_sync_builtins = yes; then
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11 AC_DEFINE(HAVE_SYNC_BUILTINS, 1,
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12 [Define to 1 if the target supports __sync_*_compare_and_swap])
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13 fi])
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14
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15 dnl Check whether the target supports hidden visibility.
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16 AC_DEFUN([LIBGOMP_CHECK_ATTRIBUTE_VISIBILITY], [
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17 AC_CACHE_CHECK([whether the target supports hidden visibility],
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18 libgomp_cv_have_attribute_visibility, [
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19 save_CFLAGS="$CFLAGS"
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20 CFLAGS="$CFLAGS -Werror"
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21 AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
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22 [], libgomp_cv_have_attribute_visibility=yes,
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23 libgomp_cv_have_attribute_visibility=no)
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24 CFLAGS="$save_CFLAGS"])
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25 if test $libgomp_cv_have_attribute_visibility = yes; then
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26 AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1,
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27 [Define to 1 if the target supports __attribute__((visibility(...))).])
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28 fi])
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29
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30 dnl Check whether the target supports dllexport
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31 AC_DEFUN([LIBGOMP_CHECK_ATTRIBUTE_DLLEXPORT], [
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32 AC_CACHE_CHECK([whether the target supports dllexport],
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33 libgomp_cv_have_attribute_dllexport, [
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34 save_CFLAGS="$CFLAGS"
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35 CFLAGS="$CFLAGS -Werror"
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36 AC_TRY_COMPILE([void __attribute__((dllexport)) foo(void) { }],
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37 [], libgomp_cv_have_attribute_dllexport=yes,
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38 libgomp_cv_have_attribute_dllexport=no)
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39 CFLAGS="$save_CFLAGS"])
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40 if test $libgomp_cv_have_attribute_dllexport = yes; then
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41 AC_DEFINE(HAVE_ATTRIBUTE_DLLEXPORT, 1,
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42 [Define to 1 if the target supports __attribute__((dllexport)).])
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43 fi])
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44
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45 dnl Check whether the target supports symbol aliases.
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46 AC_DEFUN([LIBGOMP_CHECK_ATTRIBUTE_ALIAS], [
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47 AC_CACHE_CHECK([whether the target supports symbol aliases],
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48 libgomp_cv_have_attribute_alias, [
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49 AC_TRY_LINK([
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50 void foo(void) { }
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51 extern void bar(void) __attribute__((alias("foo")));],
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52 [bar();], libgomp_cv_have_attribute_alias=yes, libgomp_cv_have_attribute_alias=no)])
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53 if test $libgomp_cv_have_attribute_alias = yes; then
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54 AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1,
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55 [Define to 1 if the target supports __attribute__((alias(...))).])
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56 fi])
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57
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58 sinclude(../libtool.m4)
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59 dnl The lines below arrange for aclocal not to bring an installed
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60 dnl libtool.m4 into aclocal.m4, while still arranging for automake to
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61 dnl add a definition of LIBTOOL to Makefile.in.
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62 ifelse(,,,[AC_SUBST(LIBTOOL)
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63 AC_DEFUN([AM_PROG_LIBTOOL])
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64 AC_DEFUN([AC_LIBTOOL_DLOPEN])
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65 AC_DEFUN([AC_PROG_LD])
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66 ])
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67
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68 dnl ----------------------------------------------------------------------
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69 dnl This whole bit snagged from libstdc++-v3.
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70
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71 dnl
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72 dnl LIBGOMP_ENABLE
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73 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
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74 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
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75 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
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76 dnl
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77 dnl See docs/html/17_intro/configury.html#enable for documentation.
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78 dnl
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79 m4_define([LIBGOMP_ENABLE],[dnl
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80 m4_define([_g_switch],[--enable-$1])dnl
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81 m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl
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82 AC_ARG_ENABLE($1,_g_help,
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83 m4_bmatch([$5],
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84 [^permit ],
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85 [[
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86 case "$enableval" in
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87 m4_bpatsubst([$5],[permit ])) ;;
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88 *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
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89 dnl Idea for future: generate a URL pointing to
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90 dnl "onlinedocs/configopts.html#whatever"
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91 esac
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92 ]],
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93 [^$],
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94 [[
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95 case "$enableval" in
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96 yes|no) ;;
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97 *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
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98 esac
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99 ]],
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100 [[$5]]),
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101 [enable_]m4_bpatsubst([$1],-,_)[=][$2])
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102 m4_undefine([_g_switch])dnl
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103 m4_undefine([_g_help])dnl
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104 ])
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105
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106
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107 dnl
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108 dnl If GNU ld is in use, check to see if tricky linker opts can be used. If
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109 dnl the native linker is in use, all variables will be defined to something
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110 dnl safe (like an empty string).
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111 dnl
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112 dnl Defines:
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113 dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible
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114 dnl OPT_LDFLAGS='-Wl,-O1' if possible
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115 dnl LD (as a side effect of testing)
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116 dnl Sets:
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117 dnl with_gnu_ld
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118 dnl libgomp_ld_is_gold (possibly)
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119 dnl libgomp_gnu_ld_version (possibly)
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120 dnl
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121 dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
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122 dnl set libgomp_gnu_ld_version to 12345. Zeros cause problems.
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123 dnl
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124 AC_DEFUN([LIBGOMP_CHECK_LINKER_FEATURES], [
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125 # If we're not using GNU ld, then there's no point in even trying these
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126 # tests. Check for that first. We should have already tested for gld
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127 # by now (in libtool), but require it now just to be safe...
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128 test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
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129 test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
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130 AC_REQUIRE([AC_PROG_LD])
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131 AC_REQUIRE([AC_PROG_AWK])
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132
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133 # The name set by libtool depends on the version of libtool. Shame on us
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134 # for depending on an impl detail, but c'est la vie. Older versions used
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135 # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
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136 # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
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137 # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't
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138 # set (hence we're using an older libtool), then set it.
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139 if test x${with_gnu_ld+set} != xset; then
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140 if test x${ac_cv_prog_gnu_ld+set} != xset; then
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141 # We got through "ac_require(ac_prog_ld)" and still not set? Huh?
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142 with_gnu_ld=no
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143 else
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144 with_gnu_ld=$ac_cv_prog_gnu_ld
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145 fi
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146 fi
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147
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148 # Start by getting the version number. I think the libtool test already
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149 # does some of this, but throws away the result.
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150 libgomp_ld_is_gold=no
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151 if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then
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152 libgomp_ld_is_gold=yes
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153 fi
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154 changequote(,)
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155 ldver=`$LD --version 2>/dev/null | head -1 | \
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156 sed -e 's/GNU \(go\)\{0,1\}ld \(version \)\{0,1\}\(([^)]*) \)\{0,1\}\([0-9.][0-9.]*\).*/\4/'`
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157 changequote([,])
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158 libgomp_gnu_ld_version=`echo $ldver | \
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159 $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
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160
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161 # Set --gc-sections.
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162 if test "$with_gnu_ld" = "notbroken"; then
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163 # GNU ld it is! Joy and bunny rabbits!
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164
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165 # All these tests are for C++; save the language and the compiler flags.
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166 # Need to do this so that g++ won't try to link in libstdc++
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167 ac_test_CFLAGS="${CFLAGS+set}"
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168 ac_save_CFLAGS="$CFLAGS"
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169 CFLAGS='-x c++ -Wl,--gc-sections'
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170
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171 # Check for -Wl,--gc-sections
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172 # XXX This test is broken at the moment, as symbols required for linking
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173 # are now in libsupc++ (not built yet). In addition, this test has
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174 # cored on solaris in the past. In addition, --gc-sections doesn't
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175 # really work at the moment (keeps on discarding used sections, first
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176 # .eh_frame and now some of the glibc sections for iconv).
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177 # Bzzzzt. Thanks for playing, maybe next time.
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178 AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
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179 AC_TRY_RUN([
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180 int main(void)
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181 {
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182 try { throw 1; }
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183 catch (...) { };
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184 return 0;
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185 }
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186 ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes])
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187 if test "$ac_test_CFLAGS" = set; then
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188 CFLAGS="$ac_save_CFLAGS"
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189 else
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190 # this is the suspicious part
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191 CFLAGS=''
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192 fi
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193 if test "$ac_sectionLDflags" = "yes"; then
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194 SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
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195 fi
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196 AC_MSG_RESULT($ac_sectionLDflags)
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197 fi
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198
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199 # Set linker optimization flags.
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200 if test x"$with_gnu_ld" = x"yes"; then
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201 OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
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202 fi
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203
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204 AC_SUBST(SECTION_LDFLAGS)
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205 AC_SUBST(OPT_LDFLAGS)
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206 ])
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207
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208
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209 dnl
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210 dnl Add version tags to symbols in shared library (or not), additionally
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211 dnl marking other symbols as private/local (or not).
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212 dnl
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213 dnl --enable-symvers=style adds a version script to the linker call when
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214 dnl creating the shared library. The choice of version script is
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215 dnl controlled by 'style'.
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216 dnl --disable-symvers does not.
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217 dnl + Usage: LIBGOMP_ENABLE_SYMVERS[(DEFAULT)]
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218 dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
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219 dnl choose a default style based on linker characteristics. Passing
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220 dnl 'no' disables versioning.
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221 dnl
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222 AC_DEFUN([LIBGOMP_ENABLE_SYMVERS], [
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223
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224 LIBGOMP_ENABLE(symvers,yes,[=STYLE],
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225 [enables symbol versioning of the shared library],
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226 [permit yes|no|gnu])
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227
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228 # If we never went through the LIBGOMP_CHECK_LINKER_FEATURES macro, then we
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229 # don't know enough about $LD to do tricks...
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230 AC_REQUIRE([LIBGOMP_CHECK_LINKER_FEATURES])
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231 # FIXME The following test is too strict, in theory.
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232 if test $enable_shared = no ||
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233 test "x$LD" = x ||
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234 test x$libgomp_gnu_ld_version = x; then
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235 enable_symvers=no
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236 fi
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237
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238 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
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239 if test $enable_symvers != no; then
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240 AC_MSG_CHECKING([for shared libgcc])
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241 ac_save_CFLAGS="$CFLAGS"
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242 CFLAGS=' -lgcc_s'
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243 AC_TRY_LINK(, [return 0;], libgomp_shared_libgcc=yes, libgomp_shared_libgcc=no)
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244 CFLAGS="$ac_save_CFLAGS"
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245 if test $libgomp_shared_libgcc = no; then
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246 cat > conftest.c <<EOF
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247 int main (void) { return 0; }
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248 EOF
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249 changequote(,)dnl
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250 libgomp_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
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251 -shared -shared-libgcc -o conftest.so \
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252 conftest.c -v 2>&1 >/dev/null \
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253 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
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254 changequote([,])dnl
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255 rm -f conftest.c conftest.so
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256 if test x${libgomp_libgcc_s_suffix+set} = xset; then
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257 CFLAGS=" -lgcc_s$libgomp_libgcc_s_suffix"
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258 AC_TRY_LINK(, [return 0;], libgomp_shared_libgcc=yes)
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259 CFLAGS="$ac_save_CFLAGS"
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260 fi
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261 fi
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262 AC_MSG_RESULT($libgomp_shared_libgcc)
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263 fi
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264
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265 # For GNU ld, we need at least this version. The format is described in
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266 # LIBGOMP_CHECK_LINKER_FEATURES above.
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267 libgomp_min_gnu_ld_version=21400
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268 # XXXXXXXXXXX libgomp_gnu_ld_version=21390
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269
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270 # Check to see if unspecified "yes" value can win, given results above.
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271 # Change "yes" into either "no" or a style name.
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272 if test $enable_symvers = yes; then
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273 if test $with_gnu_ld = yes &&
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274 test $libgomp_shared_libgcc = yes;
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275 then
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276 if test $libgomp_gnu_ld_version -ge $libgomp_min_gnu_ld_version ; then
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277 enable_symvers=gnu
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278 elif test $libgomp_ld_is_gold = yes ; then
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279 enable_symvers=gnu
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280 else
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281 # The right tools, the right setup, but too old. Fallbacks?
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282 AC_MSG_WARN(=== Linker version $libgomp_gnu_ld_version is too old for)
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283 AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
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284 AC_MSG_WARN(=== You would need to upgrade your binutils to version)
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285 AC_MSG_WARN(=== $libgomp_min_gnu_ld_version or later and rebuild GCC.)
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286 if test $libgomp_gnu_ld_version -ge 21200 ; then
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287 # Globbing fix is present, proper block support is not.
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288 dnl AC_MSG_WARN([=== Dude, you are soooo close. Maybe we can fake it.])
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289 dnl enable_symvers=???
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290 AC_MSG_WARN([=== Symbol versioning will be disabled.])
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291 enable_symvers=no
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292 else
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293 # 2.11 or older.
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294 AC_MSG_WARN([=== Symbol versioning will be disabled.])
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295 enable_symvers=no
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296 fi
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297 fi
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298 else
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299 # just fail for now
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300 AC_MSG_WARN([=== You have requested some kind of symbol versioning, but])
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301 AC_MSG_WARN([=== either you are not using a supported linker, or you are])
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302 AC_MSG_WARN([=== not building a shared libgcc_s (which is required).])
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303 AC_MSG_WARN([=== Symbol versioning will be disabled.])
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304 enable_symvers=no
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305 fi
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306 fi
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307
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308 AC_CACHE_CHECK([whether the target supports .symver directive],
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309 libgomp_cv_have_as_symver_directive, [
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310 AC_TRY_COMPILE([void foo (void); __asm (".symver foo, bar@SYMVER");],
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311 [], libgomp_cv_have_as_symver_directive=yes,
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312 libgomp_cv_have_as_symver_directive=no)])
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313 if test $libgomp_cv_have_as_symver_directive = yes; then
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314 AC_DEFINE(HAVE_AS_SYMVER_DIRECTIVE, 1,
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315 [Define to 1 if the target assembler supports .symver directive.])
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316 fi
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317
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318 AM_CONDITIONAL(LIBGOMP_BUILD_VERSIONED_SHLIB, test $enable_symvers != no)
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319 AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
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320 ])
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