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1 # Process this file with autoconf to produce a configure script, like so:
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2 # aclocal -I .. -I ../config && autoconf && autoheader && automake
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3
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4 AC_PREREQ(2.59)
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5 AC_INIT(libmudflap, 1.0)
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6 AC_CONFIG_SRCDIR(mf-runtime.c)
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7 AC_CANONICAL_SYSTEM
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8 ACX_NONCANONICAL_TARGET
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9
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10 AM_INIT_AUTOMAKE
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11
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12 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
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13 AC_ARG_ENABLE(version-specific-runtime-libs,
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14 [ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
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15 [case "$enableval" in
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16 yes) version_specific_libs=yes ;;
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17 no) version_specific_libs=no ;;
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18 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
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19 esac],
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20 [version_specific_libs=no])
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21 AC_MSG_RESULT($version_specific_libs)
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22
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23 AM_MAINTAINER_MODE
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24 AC_EXEEXT
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25
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26 AM_ENABLE_MULTILIB(, ..)
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27
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28 target_alias=${target_alias-$host_alias}
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29 AC_SUBST(target_alias)
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30
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31 AC_CONFIG_HEADERS(config.h)
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32
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33 AC_LANG_C
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34 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
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35 # We must force CC to /not/ be precious variables; otherwise
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36 # the wrong, non-multilib-adjusted value will be used in multilibs.
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37 # As a side effect, we have to subst CFLAGS ourselves.
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38
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39 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
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40 m4_define([_AC_ARG_VAR_PRECIOUS],[])
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41 AC_PROG_CC
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42 m4_rename([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
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43
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44 AC_SUBST(CFLAGS)
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45
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46 if test "x$GCC" != "xyes"; then
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47 AC_MSG_ERROR([libmudflap must be built with GCC])
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48 fi
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49 AC_PROG_CPP
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50
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51 # Some hosts don't have dlsym(RTLD_NEXT, "symbol") for use in
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52 # symbol interposition. We disable shared libraries for these.
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53 AC_MSG_CHECKING([whether dlsym(RTLD_NEXT,...) is available])
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54 AC_TRY_COMPILE([
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55 #define _GNU_SOURCE
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56 #include <dlfcn.h>
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57 ],
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58 [void *foo = dlsym (RTLD_NEXT, "exit");],
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59 [AC_MSG_RESULT(yes)],
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60 [AC_MSG_RESULT(no)
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61 enable_shared=no])
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62
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63 AC_CHECK_HEADERS(stdint.h execinfo.h signal.h dlfcn.h dirent.h pwd.h grp.h \
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64 netdb.h sys/ipc.h sys/sem.h sys/shm.h sys/wait.h ctype.h mntent.h \
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65 sys/socket.h netinet/in.h arpa/inet.h dlfcn.h sys/mman.h)
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66
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67 AC_CHECK_FUNCS(backtrace backtrace_symbols gettimeofday signal)
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68 AC_CHECK_FUNCS(fopen64 fseeko64 ftello64 stat64 freopen64)
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69 AC_CHECK_FUNCS(setbuf setbuffer setlinebuf setvbuf)
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70 AC_CHECK_FUNCS(strnlen memrchr strncpy memmem sethostname)
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71 AC_CHECK_FUNCS(__ctype_b_loc __ctype_tolower_loc __ctype_toupper_loc)
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72 AC_CHECK_FUNCS(getlogin cuserid getpwnam getpwuid getpwent getgrnam getgrgid getgrent)
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73 AC_CHECK_FUNCS(getlogin_r getpwnam_r getpwuid_r getgrnam_r getgrgid_r)
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74 AC_CHECK_FUNCS(getservent getservbyname getservbyport getaddrinfo gai_strerror)
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75 AC_CHECK_FUNCS(getprotoent getprotobyname getprotobynumber)
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76 AC_CHECK_FUNCS(getmntent setmntent addmntent)
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77 AC_CHECK_FUNCS(inet_ntoa mmap munmap)
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78 AC_CHECK_FUNCS(__libc_freeres)
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79
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80 AC_TRY_COMPILE([#include <sys/types.h>
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81 #include <sys/ipc.h>
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82 #include <sys/sem.h>],[union semun foo;], [mf_have_semun=1], [mf_have_semun=0])
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83 if test $mf_have_semun = 1
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84 then
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85 AC_DEFINE(HAVE_UNION_SEMUN, 1, [union semun defined in sys/ipc.h or sys/sem.h])
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86 fi
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87
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88
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89 AC_MSG_CHECKING([for socklen_t in sys/socket.h])
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90 AC_TRY_COMPILE([#define _POSIX_PII_SOCKET
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91 #include <sys/types.h>
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92 #include <sys/socket.h>], [socklen_t x = 5;],
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93 [AC_DEFINE(HAVE_SOCKLEN_T, 1, [Define it socklen_t typedef is in sys/socket.h.])
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94 AC_MSG_RESULT(yes)],
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95 [AC_MSG_RESULT(no)])
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96
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97 AC_LIBTOOL_DLOPEN
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98 AM_PROG_LIBTOOL
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99 AC_SUBST(enable_shared)
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100 AC_SUBST(enable_static)
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101
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102 AC_CHECK_HEADER(stdint.h, [MF_HAVE_STDINT_H=1], [MF_HAVE_STDINT_H=0])
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103 AC_SUBST(MF_HAVE_STDINT_H)
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104 if test $MF_HAVE_STDINT_H = 1
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105 then
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106 MF_HAVE_UINTPTR_T=1
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107 else
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108 AC_TRY_COMPILE([#include <sys/types.h>], [uintptr_t k = 0;],
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109 [MF_HAVE_UINTPTR_T=1], [MF_HAVE_UINTPTR_T=0])
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110 fi
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111 AC_SUBST(MF_HAVE_UINTPTR_T)
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112
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113 if test ! -d pth
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114 then
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115 # libmudflapth objects are built in this subdirectory
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116 mkdir pth
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117 fi
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118
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119 AC_CHECK_HEADERS(pthread.h)
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120
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121 AC_MSG_CHECKING([for thread model used by GCC])
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122 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
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123 AC_MSG_RESULT([$target_thread_file])
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124
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125 # We only support posix threads, or no threads at all.
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126 posix_threads=
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127 case ${target_thread_file} in
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128 posix)
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129 posix_threads=yes
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130 ;;
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131 single)
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132 ;;
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133 *)
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134 echo "${target_thread_file} is an unsupported thread package" 1>&2
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135 exit 1
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136 ;;
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137 esac
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138
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139 AM_CONDITIONAL(LIBMUDFLAPTH, [test "x$posix_threads" != "x"])
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140 if test "x$posix_threads" != "x"
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141 then
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142 build_libmudflapth=1
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143 else
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144 build_libmudflapth=0
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145 fi
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146 AC_SUBST(build_libmudflapth)
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147
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148 AC_CHECK_LIB(dl, dlsym)
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149
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150 # Calculate toolexeclibdir
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151 # Also toolexecdir, though it's only used in toolexeclibdir
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152 case ${version_specific_libs} in
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153 yes)
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154 # Need the gcc compiler version to know where to install libraries
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155 # and header files if --enable-version-specific-runtime-libs option
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156 # is selected.
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157 toolexecdir='$(libdir)/gcc/$(target_alias)'
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158 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
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159 ;;
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160 no)
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161 if test -n "$with_cross_host" &&
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162 test x"$with_cross_host" != x"no"; then
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163 # Install a library built with a cross compiler in tooldir, not libdir.
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164 toolexecdir='$(exec_prefix)/$(target_alias)'
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165 toolexeclibdir='$(toolexecdir)/lib'
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166 else
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167 toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
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168 toolexeclibdir='$(libdir)'
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169 fi
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170 multi_os_directory=`$CC -print-multi-os-directory`
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171 case $multi_os_directory in
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172 .) ;; # Avoid trailing /.
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173 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
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174 esac
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175 ;;
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176 esac
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177 AC_SUBST(toolexecdir)
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178 AC_SUBST(toolexeclibdir)
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179
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180 includedir=${toolexecdir}/include
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181 AC_SUBST(includedir)
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182
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183 pthread_create_version='""'
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184 if test "x$enable_shared" = "xyes" && test "x$posix_threads" != "x"; then
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185 # NB: don't check for -lpthread here, because then it would be
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186 # added to LIBS. For the thread-unaware libmudflap.la, we don't
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187 # want it there.
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188
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189 # glibc-related hacks. dlsym() may pick the wrong version of
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190 # interposed functions like pthread_create on modern glibc.
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191 # We need to find the proper symbol version string, and use
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192 # the nonstandard dlvsym().
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193 AC_CHECK_FUNCS(dlvsym)
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194 AC_CHECK_TOOL(NM, nm)
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195 if test "x$ac_cv_have_dlvsym" != "x"; then
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196 # Try compiling a simple pthreads program. Find the shared libraries it
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197 # ends up with. Then use "nm" on those libraries to extract the
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198 # default symbol versioning suffix ("@@"), if any. But that's tricky.
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199 # Rather, run nm on the resulting executable. Unfortunately, autoconf
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200 # doesn't appear to have a macro that builds a test executable for
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201 # subsequent analysis ... so we do it by hand here.
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202 cat >> conftest.c << EOF
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203 #include <pthread.h>
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204 int main () { void *p = (void *) & pthread_create; return (int) p; }
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205 EOF
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206 oldLIBS="$LIBS"
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207 LIBS="$LIBS -lpthread"
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208 pthread_create_version="\"\""
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209 AC_MSG_CHECKING(pthread_create symbol version)
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210 if eval $ac_link 2>&5 && test -s conftest${ac_exeext}; then
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211 version=`$NM conftest${ac_exeect} | grep 'pthread_create@@' | sed -e 's/^.*@@//'`
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212 if test "x$version" != "x"; then
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213 pthread_create_version="\"$version\""
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214 fi
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215 fi
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216 AC_MSG_RESULT($pthread_create_version)
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217 LIBS="$oldLIBS"
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218 fi
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219 fi
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220 AC_DEFINE_UNQUOTED(PTHREAD_CREATE_VERSION, $pthread_create_version, [pthread_create symbol version])
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221
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222
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223 # Figure out whether the compiler supports "-ffunction-sections -fdata-sections",
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224 # similarly to how libstdc++ does it
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225 ac_test_CFLAGS="${CFLAGS+set}"
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226 ac_save_CFLAGS="$CFLAGS"
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227
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228 # Check for -ffunction-sections -fdata-sections
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229 AC_MSG_CHECKING([for gcc that supports -ffunction-sections -fdata-sections])
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230 CFLAGS='-Werror -ffunction-sections -fdata-sections'
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231 AC_TRY_COMPILE(, [int foo;], [ac_fdsections=yes], [ac_fdsections=no])
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232 if test "$ac_test_CFLAGS" = set; then
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233 CFLAGS="$ac_save_CFLAGS"
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234 else
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235 # this is the suspicious part
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236 CFLAGS=""
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237 fi
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238 if test x"$ac_fdsections" = x"yes"; then
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239 SECTION_FLAGS='-ffunction-sections -fdata-sections'
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240 fi
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241 AC_MSG_RESULT($ac_fdsections)
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242 AC_SUBST(SECTION_FLAGS)
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243
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244
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245 # Check for the name of the symbol used for the entry point.
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246 AC_CACHE_CHECK([for the name of the symbol used for the entry point],
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247 [mudflap_cv_entry_point], [
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248 for name in _start __start unknown; do
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249 AC_LINK_IFELSE([AC_LANG_PROGRAM([extern char $name@<:@@:>@;], [$name@<:@0@:>@ = 0;])],
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250 [break])
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251 done
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252 mudflap_cv_entry_point="$name"])
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253 if test "$mudflap_cv_entry_point" = unknown; then
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254 AC_MSG_ERROR([none of the known symbol names works])
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255 fi
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256 AC_DEFINE_UNQUOTED([ENTRY_POINT], [$mudflap_cv_entry_point],
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257 [Define to the name of the symbol used for the entry point.])
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258
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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 # See if we support thread-local storage.
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267 GCC_CHECK_TLS
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268 GCC_CHECK_EMUTLS
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269
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270 AC_CONFIG_FILES([Makefile testsuite/Makefile testsuite/mfconfig.exp])
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271 AC_OUTPUT
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