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1 # Process this file with autoreconf to produce a configure script.
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2 # Copyright (C) 2012-2017 Free Software Foundation, Inc.
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3 #
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4 # This file is part of the GNU Atomic Library (libatomic).
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5 #
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6 # Libatomic is free software; you can redistribute it and/or modify it
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7 # under the terms of the GNU General Public License as published by
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8 # the Free Software Foundation; either version 3 of the License, or
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9 # (at your option) any later version.
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10 #
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11 # Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY
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12 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 # FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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14 # more details.
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15 #
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16 # Under Section 7 of GPL version 3, you are granted additional
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17 # permissions described in the GCC Runtime Library Exception, version
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18 # 3.1, as published by the Free Software Foundation.
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19 #
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20 # You should have received a copy of the GNU General Public License and
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21 # a copy of the GCC Runtime Library Exception along with this program;
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22 # see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 # <http://www.gnu.org/licenses/>.
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24
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25 AC_PREREQ(2.59)
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26 AC_INIT([GNU Atomic Library], 1.0,,[libatomic])
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27 AC_CONFIG_HEADER(auto-config.h)
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28
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29 # -------
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30 # Options
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31 # -------
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32
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33 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
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34 LIBAT_ENABLE(version-specific-runtime-libs, no, ,
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35 [Specify that runtime libraries should be installed in a compiler-specific directory],
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36 permit yes|no)
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37 AC_MSG_RESULT($enable_version_specific_runtime_libs)
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38
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39 # We would like our source tree to be readonly. However when releases or
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40 # pre-releases are generated, the flex/bison generated files as well as the
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41 # various formats of manuals need to be included along with the rest of the
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42 # sources. Therefore we have --enable-generated-files-in-srcdir to do
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43 # just that.
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44 AC_MSG_CHECKING([for --enable-generated-files-in-srcdir])
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45 LIBAT_ENABLE(generated-files-in-srcdir, no, ,
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46 [put copies of generated files in source dir intended for creating source
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47 tarballs for users without texinfo bison or flex.],
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48 permit yes|no)
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49 AC_MSG_RESULT($enable_generated_files_in_srcdir)
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50 AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)
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51
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52
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53 # -------
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54
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55 # Gets build, host, target, *_vendor, *_cpu, *_os, etc.
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56 #
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57 # You will slowly go insane if you do not grok the following fact: when
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58 # building this library, the top-level /target/ becomes the library's /host/.
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59 #
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60 # configure then causes --target to default to --host, exactly like any
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61 # other package using autoconf. Therefore, 'target' and 'host' will
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62 # always be the same. This makes sense both for native and cross compilers
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63 # just think about it for a little while. :-)
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64 #
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65 # Also, if this library is being configured as part of a cross compiler, the
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66 # top-level configure script will pass the "real" host as $with_cross_host.
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67 #
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68 # Do not delete or change the following two lines. For why, see
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69 # http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
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70 AC_CANONICAL_SYSTEM
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71 target_alias=${target_alias-$host_alias}
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72
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73 # Sets up automake. Must come after AC_CANONICAL_SYSTEM. Each of the
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74 # following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
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75 # 1.9.0: minimum required version
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76 # no-define: PACKAGE and VERSION will not be #define'd in config.h (a bunch
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77 # of other PACKAGE_* variables will, however, and there's nothing
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78 # we can do about that; they come from AC_INIT).
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79 # no-dist: we don't want 'dist' and related rules.
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80 # foreign: we don't follow the normal rules for GNU packages (no COPYING
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81 # file in the top srcdir, etc, etc), so stop complaining.
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82 # -Wall: turns on all automake warnings...
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83 # -Wno-portability: ...except this one, since GNU make is required.
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84 # -Wno-override: ... and this one, since we do want this in testsuite.
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85 AM_INIT_AUTOMAKE([1.9.0 foreign no-dist -Wall -Wno-portability -Wno-override])
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86 AM_ENABLE_MULTILIB(, ..)
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87
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88 # Calculate toolexeclibdir
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89 # Also toolexecdir, though it's only used in toolexeclibdir
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90 case ${enable_version_specific_runtime_libs} in
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91 yes)
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92 # Need the gcc compiler version to know where to install libraries
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93 # and header files if --enable-version-specific-runtime-libs option
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94 # is selected.
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95 toolexecdir='$(libdir)/gcc/$(target_alias)'
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96 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
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97 ;;
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98 no)
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99 if test -n "$with_cross_host" &&
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100 test x"$with_cross_host" != x"no"; then
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101 # Install a library built with a cross compiler in tooldir, not libdir.
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102 toolexecdir='$(exec_prefix)/$(target_alias)'
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103 toolexeclibdir='$(toolexecdir)/lib'
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104 else
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105 toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
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106 toolexeclibdir='$(libdir)'
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107 fi
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108 multi_os_directory=`$CC -print-multi-os-directory`
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109 case $multi_os_directory in
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110 .) ;; # Avoid trailing /.
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111 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
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112 esac
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113 ;;
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114 esac
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115 AC_SUBST(toolexecdir)
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116 AC_SUBST(toolexeclibdir)
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117
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118 # Check the compiler.
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119 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
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120 # We must force CC to /not/ be precious variables; otherwise
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121 # the wrong, non-multilib-adjusted value will be used in multilibs.
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122 # As a side effect, we have to subst CFLAGS ourselves.
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123
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124 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
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125 m4_define([_AC_ARG_VAR_PRECIOUS],[])
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126 AC_PROG_CC
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127 AM_PROG_AS
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128 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
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129
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130 AC_SUBST(CFLAGS)
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131
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132 # In order to override CFLAGS_FOR_TARGET, all of our special flags go
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133 # in XCFLAGS. But we need them in CFLAGS during configury. So put them
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134 # in both places for now and restore CFLAGS at the end of config.
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135 save_CFLAGS="$CFLAGS"
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136
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137 # Find other programs we need.
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138 AC_CHECK_TOOL(AR, ar)
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139 AC_CHECK_TOOL(NM, nm)
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140 AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
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141 AC_PATH_PROG(PERL, perl, perl-not-found-in-path-error)
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142 AC_PROG_INSTALL
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143
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144 # Configure libtool
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145 AM_PROG_LIBTOOL
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146 ACX_LT_HOST_FLAGS
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147 AC_SUBST(enable_shared)
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148 AC_SUBST(enable_static)
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149 AM_MAINTAINER_MODE
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150
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151 # For libtool versioning info, format is CURRENT:REVISION:AGE
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152 libtool_VERSION=3:0:2
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153 AC_SUBST(libtool_VERSION)
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154
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155 # Check for used threading-model
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156 AC_MSG_CHECKING([for thread model used by GCC])
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157 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
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158 AC_MSG_RESULT([$target_thread_file])
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159
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160 # Get target configury.
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161 . ${srcdir}/configure.tgt
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162 if test -n "$UNSUPPORTED"; then
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163 AC_MSG_ERROR([Configuration ${target} is unsupported.])
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164 fi
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165
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166 # Disable fallbacks to __sync routines from libgcc. Otherwise we'll
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167 # make silly decisions about what the cpu can do.
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168 CFLAGS="$save_CFLAGS -fno-sync-libcalls $XCFLAGS"
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169
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170 # Check header files.
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171 AC_STDC_HEADERS
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172 ACX_HEADER_STRING
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173 GCC_HEADER_STDINT(gstdint.h)
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174 AC_CHECK_HEADERS([fenv.h])
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175
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176 # Check for common type sizes
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177 LIBAT_FORALL_MODES([LIBAT_HAVE_INT_MODE])
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178
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179 # Check for compiler builtins of atomic operations.
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180 LIBAT_TEST_ATOMIC_INIT
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181 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_LOADSTORE])
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182 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_TAS])
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183 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_EXCHANGE])
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184 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_CAS])
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185 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_ADD])
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186 LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_OP])
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187
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188 AC_C_BIGENDIAN
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189 # I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE.
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190 AH_BOTTOM(
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191 [#ifndef WORDS_BIGENDIAN
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192 #define WORDS_BIGENDIAN 0
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193 #endif])
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194
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195 LIBAT_WORDSIZE
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196
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197 # Check to see if -pthread or -lpthread is needed. Prefer the former.
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198 # In case the pthread.h system header is not found, this test will fail.
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199 case " $config_path " in
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200 *" posix "*)
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201 XPCFLAGS=""
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202 CFLAGS="$CFLAGS -pthread"
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203 AC_LINK_IFELSE(
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204 [AC_LANG_PROGRAM(
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205 [#include <pthread.h>
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206 void *g(void *d) { return NULL; }],
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207 [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
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208 [XPCFLAGS=" -pthread"],
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209 [CFLAGS="$save_CFLAGS $XCFLAGS" LIBS="-lpthread $LIBS"
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210 AC_LINK_IFELSE(
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211 [AC_LANG_PROGRAM(
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212 [#include <pthread.h>
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213 void *g(void *d) { return NULL; }],
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214 [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
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215 [],
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216 [AC_MSG_ERROR([Pthreads are required to build libatomic])])])
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217 CFLAGS="$save_CFLAGS $XPCFLAGS"
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218 ;;
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219 esac
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220
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221 # See what sort of export controls are available.
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222 LIBAT_CHECK_ATTRIBUTE_VISIBILITY
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223 LIBAT_CHECK_ATTRIBUTE_DLLEXPORT
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224 LIBAT_CHECK_ATTRIBUTE_ALIAS
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225 if test x$try_ifunc = xyes; then
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226 LIBAT_CHECK_IFUNC
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227 fi
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228
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229 # Check linker support.
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230 LIBAT_ENABLE_SYMVERS
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231
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232 # Cleanup and exit.
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233 CFLAGS="$save_CFLAGS"
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234 AC_CACHE_SAVE
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235
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236 # Add -Wall -Werror if we are using GCC.
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237 if test "x$GCC" = "xyes"; then
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238 XCFLAGS="$XCFLAGS -Wall -Werror"
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239 fi
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240
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241 XCFLAGS="$XCFLAGS $XPCFLAGS"
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242
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243 AC_SUBST(config_path)
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244 AC_SUBST(XCFLAGS)
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245 AC_SUBST(XLDFLAGS)
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246 AC_SUBST(LIBS)
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247 AC_SUBST(SIZES)
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248
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249 AM_CONDITIONAL(HAVE_IFUNC, test x$libat_cv_have_ifunc = xyes)
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250 AM_CONDITIONAL(ARCH_ARM_LINUX,
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251 [expr "$config_path" : ".* linux/arm .*" > /dev/null])
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252 AM_CONDITIONAL(ARCH_I386,
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253 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x4])
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254 AM_CONDITIONAL(ARCH_X86_64,
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255 [test "$ARCH" = x86 && test x$libat_cv_wordsize = x8])
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256
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257 # Determine what GCC version number to use in filesystem paths.
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258 GCC_BASE_VER
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259
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260 if test ${multilib} = yes; then
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261 multilib_arg="--enable-multilib"
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262 else
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263 multilib_arg=
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264 fi
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265
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266 AC_CONFIG_FILES(Makefile testsuite/Makefile)
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267 AC_OUTPUT
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