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 $with_cross_host.
  20 #
  21 # Do not delete or change the following two lines.  For why, see
  22 # http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
  23 AC_CANONICAL_SYSTEM
  24 target_alias=${target_alias-$host_alias}
  25
  26 AM_INIT_AUTOMAKE([1.9.0 foreign subdir-objects no-dist -Wall -Werror])
  27
  28 AC_PROG_CC
  29 AM_PROG_CC_C_O
  30
  31 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
  32 AC_ARG_ENABLE(version-specific-runtime-libs,
  33 [  --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory ],
  34 [case "$enableval" in
  35  yes) version_specific_libs=yes ;;
  36  no)  version_specific_libs=no ;;
  37  *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
  38  esac],
  39 [version_specific_libs=no])
  40 AC_MSG_RESULT($version_specific_libs)
  41
  42
  43 # Configure libtool
  44 AM_PROG_LIBTOOL
  45 AC_SUBST(enable_shared)
  46 AC_SUBST(enable_static)
  47
  48 AM_MAINTAINER_MODE
  49 AM_ENABLE_MULTILIB(, ..)
  50
  51 # Calculate toolexeclibdir
  52 # Also toolexecdir, though it's only used in toolexeclibdir
  53 case ${version_specific_libs} in
  54   yes)
  55     # Need the gcc compiler version to know where to install libraries
  56     # and header files if --enable-version-specific-runtime-libs option
  57     # is selected.
  58     toolexecdir='$(libdir)/gcc/$(target_alias)'
  59     toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
  60     ;;
  61   no)
  62     if test -n "$with_cross_host" &&
  63        test x"$with_cross_host" != x"no"; then
  64       # Install a library built with a cross compiler in tooldir, not libdir.
  65       toolexecdir='$(exec_prefix)/$(target_alias)'
  66       toolexeclibdir='$(toolexecdir)/lib'
  67     else
  68       toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
  69       toolexeclibdir='$(libdir)'
  70     fi
  71     multi_os_directory=`$CC -print-multi-os-directory`
  72     case $multi_os_directory in
  73       .) ;; # Avoid trailing /.
  74       *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
  75     esac
  76     ;;
  77 esac
  78 AC_SUBST(toolexecdir)
  79 AC_SUBST(toolexeclibdir)
  80
  81 AC_CHECK_LIB([m],[sqrtl],[AC_DEFINE([HAVE_SQRTL],[1],[libm includes sqrtl])])
  82 AC_CHECK_LIB([m],[cbrtl],[AC_DEFINE([HAVE_CBRTL],[1],[libm includes cbrtl])])
  83
  84 # Check for symbol versioning (copied from libssp).
  85 AC_MSG_CHECKING([whether symbol versioning is supported])
  86 save_LDFLAGS="$LDFLAGS"
  87 LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
  88 cat > conftest.map <<EOF
  89 FOO_1.0 {
  90   global: *foo*; bar; local: *;
  91 };
  92 EOF
  93 AC_TRY_LINK([int foo;],[],[quadmath_use_symver=gnu],[quadmath_use_symver=no])
  94 if test x$quadmath_use_symver = xno; then
  95   case "$target_os" in
  96     solaris2*)
  97       LDFLAGS="$save_LDFLAGS"
  98       LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
  99       # Sun ld cannot handle wildcards and treats all entries as undefined.
 100       cat > conftest.map <<EOF
 101 FOO_1.0 {
 102   global: foo; local: *;
 103 };
 104 EOF
 105       AC_TRY_LINK([int foo;],[],[quadmath_use_symver=sun],[quadmath_use_symver=no])
 106       ;;
 107   esac
 108 fi
 109 LDFLAGS="$save_LDFLAGS"
 110 AC_MSG_RESULT($quadmath_use_symver)
 111 AM_CONDITIONAL(LIBQUAD_USE_SYMVER, [test "x$quadmath_use_symver" != xno])
 112 AM_CONDITIONAL(LIBQUAD_USE_SYMVER_GNU, [test "x$quadmath_use_symver" = xgnu])
 113 AM_CONDITIONAL(LIBQUAD_USE_SYMVER_SUN, [test "x$quadmath_use_symver" = xsun])
 114
 115 AC_MSG_CHECKING([whether __float128 is supported])
 116   AC_TRY_LINK([
 117     typedef _Complex float __attribute__((mode(TC))) __complex128;
 118
 119     __float128 foo (__float128 x)
 120     {
 121
 122      __complex128 z1, z2;
 123
 124      z1 = x;
 125      z2 = x / 7.Q;
 126      z2 /= z1;
 127
 128      return (__float128) z2;
 129     }
 130
 131     __float128 bar (__float128 x)
 132     {
 133       return x * __builtin_huge_valq ();
 134     }
 135   ],[
 136     foo (1.2Q);
 137     bar (1.2Q);
 138   ],[
 139     libquad_have_float128=yes
 140   ],[
 141     libquad_have_float128=no
 142 ])
 143 AC_MSG_RESULT([$libquad_have_float128])
 144
 145 dnl
 146 dnl Enable the following for a stand-alone library:
 147 dnl
 148 dnl if test $libquad_have_float128 = no; then
 149 dnl   AC_MSG_ERROR([__float128 support is required to build this library.])
 150 dnl fi
 151
 152 AM_CONDITIONAL(BUILD_LIBQUADMATH, [test "x$libquad_have_float128" = xyes])
 153
 154 AC_CACHE_SAVE
 155
 156 if test ${multilib} = yes; then
 157   multilib_arg="--enable-multilib"
 158 else
 159   multilib_arg=
 160 fi
 161
 162 AC_CONFIG_FILES(Makefile)
 163 AC_OUTPUT