libquadmath/configure.ac

   1 # Process this file with autoconf to produce a configure script, like so:
   2 # aclocal && autoconf && autoheader && automake
   3
   4 AC_PREREQ(2.64)
   5 AC_INIT([GCC Quad-precision Math Library], 0.1,,[libquadmath])
   6 AC_CONFIG_HEADER(config.h)
   7
   8 # Gets build, host, target, *_vendor, *_cpu, *_os, etc.
   9 #
  10 # You will slowly go insane if you do not grok the following fact:  when
  11 # building this library, the top-level /target/ becomes the library's /host/.
  12 #
  13 # configure then causes --target to default to --host, exactly like any
  14 # other package using autoconf.  Therefore, 'target' and 'host' will
  15 # always be the same.  This makes sense both for native and cross compilers
  16 # just think about it for a little while.  :-)
  17 #
  18 # Also, if this library is being configured as part of a cross compiler, the
  19 # top-level configure script will pass the "real" host as $with_cross_host.
  20 #
  21 # Do not delete or change the following two lines.  For why, see
  22 # http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
  23 AC_CANONICAL_SYSTEM
  24 ACX_NONCANONICAL_TARGET
  25
  26 target_alias=${target_alias-$host_alias}
  27 AC_SUBST(target_alias)
  28
  29 AM_INIT_AUTOMAKE([1.9.0 foreign subdir-objects no-dist -Wall -Wno-override -Werror])
  30
  31 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
  32 AC_ARG_ENABLE(version-specific-runtime-libs,
  33 AS_HELP_STRING([--enable-version-specific-runtime-libs],
  34  [specify that runtime libraries should be installed in a compiler-specific directory]),
  35 [case "$enableval" in
  36  yes) version_specific_libs=yes ;;
  37  no)  version_specific_libs=no ;;
  38  *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
  39  esac],
  40 [version_specific_libs=no])
  41 AC_MSG_RESULT($version_specific_libs)
  42
  43 GCC_NO_EXECUTABLES
  44
  45 # See if makeinfo has been installed and is modern enough
  46 # that we can use it.
  47 ACX_CHECK_PROG_VER([MAKEINFO], [makeinfo], [--version],
  48                    [GNU texinfo.* \([0-9][0-9.]*\)],
  49                    [4.[4-9]*|4.[1-9][0-9]*|[5-9]*|[1-9][0-9]*])
  50 AM_CONDITIONAL(BUILD_INFO, test $gcc_cv_prog_makeinfo_modern = "yes")
  51
  52 ACX_BUGURL([http://gcc.gnu.org/bugs.html])
  53
  54 # Configure libtool
  55 AM_PROG_LIBTOOL
  56 ACX_LT_HOST_FLAGS
  57 AC_SUBST(enable_shared)
  58 AC_SUBST(enable_static)
  59
  60 AM_MAINTAINER_MODE
  61 AM_ENABLE_MULTILIB(, ..)
  62
  63 AC_LANG_C
  64 # The same as in boehm-gc and libstdc++. Have to borrow it from there.
  65 # We must force CC to /not/ be precious variables; otherwise
  66 # the wrong, non-multilib-adjusted value will be used in multilibs.
  67 # As a side effect, we have to subst CFLAGS ourselves.
  68
  69 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
  70 m4_define([_AC_ARG_VAR_PRECIOUS],[])
  71 AC_PROG_CC
  72 m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
  73
  74 AC_SUBST(CFLAGS)
  75
  76 AM_PROG_CC_C_O
  77
  78 if test "x$GCC" != "xyes"; then
  79   AC_MSG_ERROR([libquadmath must be built with GCC])
  80 fi
  81 AC_PROG_CPP
  82
  83 # Calculate toolexeclibdir
  84 # Also toolexecdir, though it's only used in toolexeclibdir
  85 case ${version_specific_libs} in
  86   yes)
  87     # Need the gcc compiler version to know where to install libraries
  88     # and header files if --enable-version-specific-runtime-libs option
  89     # is selected.
  90     toolexecdir='$(libdir)/gcc/$(target_alias)'
  91     toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
  92     ;;
  93   no)
  94     if test -n "$with_cross_host" &&
  95        test x"$with_cross_host" != x"no"; then
  96       # Install a library built with a cross compiler in tooldir, not libdir.
  97       toolexecdir='$(exec_prefix)/$(target_alias)'
  98       toolexeclibdir='$(toolexecdir)/lib'
  99     else
 100       toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
 101       toolexeclibdir='$(libdir)'
 102     fi
 103     multi_os_directory=`$CC -print-multi-os-directory`
 104     case $multi_os_directory in
 105       .) ;; # Avoid trailing /.
 106       *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
 107     esac
 108     ;;
 109 esac
 110 AC_SUBST(toolexecdir)
 111 AC_SUBST(toolexeclibdir)
 112
 113 AC_CHECK_HEADERS(fenv.h)
 114
 115 # If available, sqrtl and cbrtl speed up the calculation -
 116 # but they are not required
 117 if test x$gcc_no_link != xyes; then
 118   AC_CHECK_LIB([m],[sqrtl],[AC_DEFINE([HAVE_SQRTL],[1],[libm includes sqrtl])])
 119   AC_CHECK_LIB([m],[cbrtl],[AC_DEFINE([HAVE_CBRTL],[1],[libm includes cbrtl])])
 120   AC_CHECK_LIB([m],[feholdexcept],[AC_DEFINE([HAVE_FEHOLDEXCEPT],[1],[libm includes feholdexcept])])
 121   AC_CHECK_LIB([m],[fesetround],[AC_DEFINE([HAVE_FESETROUND],[1],[libm includes fesetround])])
 122   AC_CHECK_LIB([m],[feupdateenv],[AC_DEFINE([HAVE_FEUPDATEENV],[1],[libm includes feupdateenv])])
 123   AC_CHECK_LIB([m],[fesetenv],[AC_DEFINE([HAVE_FESETENV],[1],[libm includes fesetenv])])
 124   AC_CHECK_LIB([m],[fetestexcept],[AC_DEFINE([HAVE_FETESTEXCEPT],[1],[libm includes fetestexcept])])
 125 else
 126   if test "x$ac_cv_lib_m_sqrtl" = x""yes; then
 127     AC_DEFINE([HAVE_SQRTL],[1],[libm includes sqrtl])
 128   fi
 129   if test "x$ac_cv_lib_m_cbrtl" = x""yes; then
 130     AC_DEFINE([HAVE_CBRTL],[1],[libm includes cbrtl])
 131   fi
 132   if test "x$ac_cv_lib_m_feholdexcept" = x""yes; then
 133     AC_DEFINE([HAVE_FEHOLDEXCEPT],[1],[libm includes feholdexcept])
 134   fi
 135   if test "x$ac_cv_lib_m_fesetround" = x""yes; then
 136     AC_DEFINE([HAVE_FESETROUND],[1],[libm includes fesetround])
 137   fi
 138   if test "x$ac_cv_lib_m_feupdateenv" = x""yes; then
 139     AC_DEFINE([HAVE_FEUPDATEENV],[1],[libm includes feupdateenv])
 140   fi
 141   if test "x$ac_cv_lib_m_fesetenv" = x""yes; then
 142     AC_DEFINE([HAVE_FESETENV],[1],[libm includes fesetenv])
 143   fi
 144   if test "x$ac_cv_lib_m_fetestexcept" = x""yes; then
 145     AC_DEFINE([HAVE_FETESTEXCEPT],[1],[libm includes fetestexcept])
 146   fi
 147 fi
 148
 149 # Check for symbol versioning (copied from libssp).
 150 AC_MSG_CHECKING([whether symbol versioning is supported])
 151 if test x$gcc_no_link = xyes; then
 152   # If we cannot link, we cannot build shared libraries, so do not use
 153   # symbol versioning.
 154   quadmath_use_symver=no
 155 else
 156   save_LDFLAGS="$LDFLAGS"
 157   LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
 158   cat > conftest.map <<EOF
 159 FOO_1.0 {
 160   global: *foo*; bar; local: *;
 161 };
 162 EOF
 163   AC_TRY_LINK([int foo;],[],[quadmath_use_symver=gnu],[quadmath_use_symver=no])
 164   if test x$quadmath_use_symver = xno; then
 165     case "$target_os" in
 166       solaris2*)
 167         LDFLAGS="$save_LDFLAGS"
 168         LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
 169         # Sun ld cannot handle wildcards and treats all entries as undefined.
 170         cat > conftest.map <<EOF
 171 FOO_1.0 {
 172   global: foo; local: *;
 173 };
 174 EOF
 175         AC_TRY_LINK([int foo;],[],[quadmath_use_symver=sun],[quadmath_use_symver=no])
 176         ;;
 177     esac
 178   fi
 179   LDFLAGS="$save_LDFLAGS"
 180 fi
 181 AC_MSG_RESULT($quadmath_use_symver)
 182 AM_CONDITIONAL(LIBQUAD_USE_SYMVER, [test "x$quadmath_use_symver" != xno])
 183 AM_CONDITIONAL(LIBQUAD_USE_SYMVER_GNU, [test "x$quadmath_use_symver" = xgnu])
 184 AM_CONDITIONAL(LIBQUAD_USE_SYMVER_SUN, [test "x$quadmath_use_symver" = xsun])
 185
 186 AC_CACHE_CHECK([whether __float128 is supported], [libquad_cv_have_float128],
 187   [GCC_TRY_COMPILE_OR_LINK([
 188     typedef _Complex float __attribute__((mode(TC))) __complex128;
 189
 190     __float128 foo (__float128 x)
 191     {
 192
 193      __complex128 z1, z2;
 194
 195      z1 = x;
 196      z2 = x / 7.Q;
 197      z2 /= z1;
 198
 199      return (__float128) z2;
 200     }
 201
 202     __float128 bar (__float128 x)
 203     {
 204       return x * __builtin_huge_valq ();
 205     }
 206   ],[
 207     foo (1.2Q);
 208     bar (1.2Q);
 209   ],[
 210     libquad_cv_have_float128=yes
 211   ],[
 212     libquad_cv_have_float128=no
 213 ])])
 214 AM_CONDITIONAL(BUILD_LIBQUADMATH, [test "x$libquad_cv_have_float128" = xyes])
 215
 216 AC_CACHE_SAVE
 217
 218 if test ${multilib} = yes; then
 219   multilib_arg="--enable-multilib"
 220 else
 221   multilib_arg=
 222 fi
 223
 224
 225 # We would like our source tree to be readonly. However when releases or
 226 # pre-releases are generated, the flex/bison generated files as well as the
 227 # various formats of manuals need to be included along with the rest of the
 228 # sources.  Therefore we have --enable-generated-files-in-srcdir to do
 229 # just that.
 230 AC_MSG_CHECKING(generated-files-in-srcdir)
 231 AC_ARG_ENABLE(generated-files-in-srcdir,
 232 AS_HELP_STRING([--enable-generated-files-in-srcdir],
 233  [put copies of generated files in source dir intended for creating source tarballs for users without texinfo bison or flex]),
 234 [case "$enableval" in
 235  yes) enable_generated_files_in_srcdir=yes ;;
 236  no)  enable_generated_files_in_srcdir=no ;;
 237  *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
 238  esac],
 239 [enable_generated_files_in_srcdir=no])
 240 AC_MSG_RESULT($enable_generated_files_in_srcdir)
 241 AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)
 242
 243
 244 AC_CONFIG_FILES(Makefile)
 245 AC_OUTPUT