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1 # Process this file with autoconf to produce a configure script, like so:
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2 #
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3 # aclocal -I .. -I ../config && autoconf && autoheader && automake
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4
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5 AC_PREREQ(2.59)
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6 AC_INIT(libssp, 1.0)
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7 AC_CONFIG_SRCDIR(ssp.c)
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8 AC_CANONICAL_SYSTEM
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9 ACX_NONCANONICAL_TARGET
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10
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11 AM_INIT_AUTOMAKE
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12
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13 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
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14 AC_ARG_ENABLE(version-specific-runtime-libs,
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15 [ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
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16 [case "$enableval" in
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17 yes) version_specific_libs=yes ;;
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18 no) version_specific_libs=no ;;
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19 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
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20 esac],
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21 [version_specific_libs=no])
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22 AC_MSG_RESULT($version_specific_libs)
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23
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24 AM_MAINTAINER_MODE
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25
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26 GCC_NO_EXECUTABLES
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27
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28 AM_ENABLE_MULTILIB(, ..)
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29
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30 target_alias=${target_alias-$host_alias}
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31 AC_SUBST(target_alias)
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32
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33 AC_CONFIG_HEADERS(config.h)
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34
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35 AC_LANG_C
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36 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
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37 # We must force CC to /not/ be precious variables; otherwise
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38 # the wrong, non-multilib-adjusted value will be used in multilibs.
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39 # As a side effect, we have to subst CFLAGS ourselves.
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40
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41 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
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42 m4_define([_AC_ARG_VAR_PRECIOUS],[])
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43 AC_PROG_CC
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44 m4_rename([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
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45
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46 AC_SUBST(CFLAGS)
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47
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48 if test "x$GCC" != "xyes"; then
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49 AC_MSG_ERROR([libssp must be built with GCC])
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50 fi
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51 AC_PROG_CPP
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52
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53 AC_MSG_CHECKING([whether -fstack-protector works])
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54 save_CFLAGS="$CFLAGS"
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55 CFLAGS="$CFLAGS -fstack-protector -Werror"
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56 AC_TRY_COMPILE([
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57 void __attribute__((noinline)) bar (char *x)
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58 {
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59 __builtin_memset (x, 0, 64);
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60 }],[char buf[64]; bar (buf);],
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61 [AC_MSG_RESULT(yes)],
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62 [AC_MSG_RESULT(no)])
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63 CFLAGS="$save_CFLAGS"
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64
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65 AC_MSG_CHECKING([whether hidden visibility is supported])
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66 AC_TRY_COMPILE([
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67 void __attribute__((visibility ("hidden"))) bar (void) {}],,
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68 [ssp_hidden=yes],[ssp_hidden=no])
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69 AC_MSG_RESULT($ssp_hidden)
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70 if test x$ssp_hidden = xyes; then
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71 AC_DEFINE([HAVE_HIDDEN_VISIBILITY],[1],[__attribute__((visibility ("hidden"))) supported])
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72 fi
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73
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74 AC_MSG_CHECKING([whether symbol versioning is supported])
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75 cat > conftest.map <<EOF
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76 FOO_1.0 {
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77 global: *foo*; bar; local: *;
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78 };
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79 EOF
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80 save_LDFLAGS="$LDFLAGS"
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81 LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
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82 if test x$gcc_no_link = xyes; then
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83 # If we cannot link, we cannot build shared libraries, so do not use
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84 # symbol versioning.
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85 ssp_use_symver=no
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86 else
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87 AC_TRY_LINK([int foo;],[],[ssp_use_symver=yes],[ssp_use_symver=no])
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88 fi
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89 LDFLAGS="$save_LDFLAGS"
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90 AC_MSG_RESULT($ssp_use_symver)
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91 AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" = xyes])
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92
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93 AC_CHECK_HEADERS(alloca.h paths.h syslog.h string.h unistd.h fcntl.h stdio.h limits.h)
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94
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95 if test x$gcc_no_link = xyes; then
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96 # Presume the ISO C functions are available; add target-specific
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97 # configuration here if required.
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98 AC_DEFINE(HAVE_STRNCPY)
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99 AC_DEFINE(HAVE_STRNCAT)
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100 else
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101 AC_CHECK_FUNCS(mempcpy strncpy strncat)
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102 fi
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103
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104 AC_MSG_CHECKING([whether vsnprintf is usable])
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105 AC_RUN_IFELSE(AC_LANG_PROGRAM([
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106 #include <stdarg.h>
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107 #include <string.h>
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108 #include <stdio.h>
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109 int foo (char *buf, size_t n, const char *fmt, ...)
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110 {
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111 va_list ap;
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112 int ret;
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113 va_start (ap, fmt);
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114 ret = vsnprintf (buf, n, fmt, ap);
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115 va_end (ap);
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116 return ret;
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117 }],
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118 [char buf@<:@8@:>@; memset (buf, 'A', sizeof (buf));
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119 if (foo (buf, 4, ".%s.", "CDEFG") != 7)
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120 return 1;
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121 return memcmp (buf, ".CD\0AAAA", sizeof (buf)) != 0;]),
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122 [ssp_have_usable_vsnprintf=define],
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123 [ssp_have_usable_vsnprintf=undef],
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124 [ssp_have_usable_vsnprintf=undef])
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125 if test "x$ssp_have_usable_vsnprintf" = xdefine; then
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126 AC_MSG_RESULT(yes)
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127 AC_DEFINE([HAVE_USABLE_VSNPRINTF],[1],[vsnprintf is present and works])
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128 else
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129 AC_MSG_RESULT(no)
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130 fi
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131 AC_SUBST(ssp_have_usable_vsnprintf)
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132
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133 AM_PROG_LIBTOOL
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134 AC_SUBST(enable_shared)
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135 AC_SUBST(enable_static)
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136
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137 # Calculate toolexeclibdir
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138 # Also toolexecdir, though it's only used in toolexeclibdir
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139 case ${version_specific_libs} in
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140 yes)
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141 # Need the gcc compiler version to know where to install libraries
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142 # and header files if --enable-version-specific-runtime-libs option
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143 # is selected.
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144 toolexecdir='$(libdir)/gcc/$(target_alias)'
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145 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
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146 ;;
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147 no)
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148 if test -n "$with_cross_host" &&
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149 test x"$with_cross_host" != x"no"; then
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150 # Install a library built with a cross compiler in tooldir, not libdir.
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151 toolexecdir='$(exec_prefix)/$(target_alias)'
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152 toolexeclibdir='$(toolexecdir)/lib'
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153 else
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154 toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
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155 toolexeclibdir='$(libdir)'
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156 fi
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157 multi_os_directory=`$CC -print-multi-os-directory`
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158 case $multi_os_directory in
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159 .) ;; # Avoid trailing /.
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160 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
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161 esac
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162 ;;
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163 esac
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164 AC_SUBST(toolexecdir)
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165 AC_SUBST(toolexeclibdir)
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166
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167 if test ${multilib} = yes; then
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168 multilib_arg="--enable-multilib"
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169 else
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170 multilib_arg=
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171 fi
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172
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173 AC_CONFIG_FILES([Makefile ssp/ssp.h])
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174 AC_OUTPUT
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