vect: Add a function to check lane-reducing code

[thirdparty/gcc.git] / libquadmath / configure.ac

# Process this file with autoconf to produce a configure script, like so:
# aclocal && autoconf && autoheader && automake

AC_INIT([GCC Quad-precision Math Library], 0.1,,[libquadmath])
AC_CONFIG_HEADER(config.h)

# Gets build, host, target, *_vendor, *_cpu, *_os, etc.
#
# You will slowly go insane if you do not grok the following fact:  when
# building this library, the top-level /target/ becomes the library's /host/.
#
# configure then causes --target to default to --host, exactly like any
# other package using autoconf.  Therefore, 'target' and 'host' will
# always be the same.  This makes sense both for native and cross compilers
# just think about it for a little while.  :-)
#
# Also, if this library is being configured as part of a cross compiler, the
# top-level configure script will pass the "real" host as $with_cross_host.
#
# Do not delete or change the following two lines.  For why, see
# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
AC_CANONICAL_SYSTEM
ACX_NONCANONICAL_TARGET

AM_ENABLE_MULTILIB(, ..)

target_alias=${target_alias-$host_alias}
AC_SUBST(target_alias)

AM_INIT_AUTOMAKE([1.9.0 foreign subdir-objects no-dist -Wall -Wno-override -Werror])

AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
AC_ARG_ENABLE(version-specific-runtime-libs,
AS_HELP_STRING([--enable-version-specific-runtime-libs],
 [specify that runtime libraries should be installed in a compiler-specific directory]),
[case "$enableval" in
 yes) version_specific_libs=yes ;;
 no)  version_specific_libs=no ;;
 *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
 esac],
[version_specific_libs=no])
AC_MSG_RESULT($version_specific_libs)

GCC_NO_EXECUTABLES

AC_USE_SYSTEM_EXTENSIONS

# See if makeinfo has been installed and is modern enough
# that we can use it.
ACX_CHECK_PROG_VER([MAKEINFO], [makeinfo], [--version],
                   [GNU texinfo.* \([0-9][0-9.]*\)],
                   [4.[4-9]*|4.[1-9][0-9]*|[5-9]*|[1-9][0-9]*])
AM_CONDITIONAL(BUILD_INFO, test $gcc_cv_prog_makeinfo_modern = "yes")

ACX_BUGURL([https://gcc.gnu.org/bugs/])

# Configure libtool
AM_PROG_LIBTOOL
ACX_LT_HOST_FLAGS
AC_SUBST(enable_shared)
AC_SUBST(enable_static)
AM_CONDITIONAL([ENABLE_DARWIN_AT_RPATH], [test x$enable_darwin_at_rpath = xyes])

AM_MAINTAINER_MODE

AC_LANG_C
# The same as in boehm-gc and libstdc++. Have to borrow it from there.
# We must force CC to /not/ be precious variables; otherwise
# the wrong, non-multilib-adjusted value will be used in multilibs.
# As a side effect, we have to subst CFLAGS ourselves.

m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
m4_define([_AC_ARG_VAR_PRECIOUS],[])
AC_PROG_CC
m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])

AC_SUBST(CFLAGS)

AM_PROG_CC_C_O

if test "x$GCC" != "xyes"; then
  AC_MSG_ERROR([libquadmath must be built with GCC])
fi
AC_PROG_CPP

GCC_WITH_TOOLEXECLIBDIR

# Calculate toolexeclibdir
# Also toolexecdir, though it's only used in toolexeclibdir
case ${version_specific_libs} in
  yes)
    # Need the gcc compiler version to know where to install libraries
    # and header files if --enable-version-specific-runtime-libs option
    # is selected.
    toolexecdir='$(libdir)/gcc/$(target_alias)'
    toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
    ;;
  no)
    if test -n "$with_cross_host" &&
       test x"$with_cross_host" != x"no"; then
      # Install a library built with a cross compiler in tooldir, not libdir.
      toolexecdir='$(exec_prefix)/$(target_alias)'
      case ${with_toolexeclibdir} in
	no)
	  toolexeclibdir='$(toolexecdir)/lib'
	  ;;
	*)
	  toolexeclibdir=${with_toolexeclibdir}
	  ;;
      esac
    else
      toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
      toolexeclibdir='$(libdir)'
    fi
    multi_os_directory=`$CC -print-multi-os-directory`
    case $multi_os_directory in
      .) ;; # Avoid trailing /.
      *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
    esac
    ;;
esac
AC_SUBST(toolexecdir)
AC_SUBST(toolexeclibdir)

# AC_CHECK_LIBM variant which avoids AC_CHECK_LIB (that doesn't work
# on bare metal).  In the past we've used -lm in Makefile.am unconditionally,
# let's use it there unless target knows it doesn't need that.
LIBM=
case $host in
*-*-beos* | *-*-cegcc* | *-*-cygwin* | *-*-haiku* | *-*-pw32* | *-*-darwin*)
  # These system don't have libm, or don't need it
  ;;
*)
  LIBM=-lm
  ;;
esac
AC_SUBST([LIBM])

AC_CHECK_HEADERS(fenv.h langinfo.h locale.h wchar.h wctype.h limits.h ctype.h printf.h errno.h)
LIBQUAD_CHECK_MATH_H_SIGNGAM

# If available, sqrtl and cbrtl speed up the calculation -
# but they are not required
if test x$gcc_no_link != xyes; then
  AC_CHECK_LIB([m],[sqrtl],[AC_DEFINE([HAVE_SQRTL],[1],[libm includes sqrtl])])
  AC_CHECK_LIB([m],[cbrtl],[AC_DEFINE([HAVE_CBRTL],[1],[libm includes cbrtl])])
  AC_CHECK_LIB([m],[feholdexcept],[AC_DEFINE([HAVE_FEHOLDEXCEPT],[1],[libm includes feholdexcept])])
  AC_CHECK_LIB([m],[fesetround],[AC_DEFINE([HAVE_FESETROUND],[1],[libm includes fesetround])])
  AC_CHECK_LIB([m],[feupdateenv],[AC_DEFINE([HAVE_FEUPDATEENV],[1],[libm includes feupdateenv])])
  AC_CHECK_LIB([m],[fesetenv],[AC_DEFINE([HAVE_FESETENV],[1],[libm includes fesetenv])])
  AC_CHECK_LIB([m],[fetestexcept],[AC_DEFINE([HAVE_FETESTEXCEPT],[1],[libm includes fetestexcept])])
  AC_CHECK_FUNCS(strtoull)
else
  if test "x$ac_cv_lib_m_sqrtl" = x""yes; then
    AC_DEFINE([HAVE_SQRTL],[1],[libm includes sqrtl])  
  fi
  if test "x$ac_cv_lib_m_cbrtl" = x""yes; then
    AC_DEFINE([HAVE_CBRTL],[1],[libm includes cbrtl])  
  fi
  if test "x$ac_cv_lib_m_feholdexcept" = x""yes; then
    AC_DEFINE([HAVE_FEHOLDEXCEPT],[1],[libm includes feholdexcept])
  fi
  if test "x$ac_cv_lib_m_fesetround" = x""yes; then
    AC_DEFINE([HAVE_FESETROUND],[1],[libm includes fesetround])
  fi
  if test "x$ac_cv_lib_m_feupdateenv" = x""yes; then
    AC_DEFINE([HAVE_FEUPDATEENV],[1],[libm includes feupdateenv])
  fi
  if test "x$ac_cv_lib_m_fesetenv" = x""yes; then
    AC_DEFINE([HAVE_FESETENV],[1],[libm includes fesetenv])
  fi
  if test "x$ac_cv_lib_m_fetestexcept" = x""yes; then
    AC_DEFINE([HAVE_FETESTEXCEPT],[1],[libm includes fetestexcept])
  fi
fi

# Check for hidden visibility (copied from libssp).
saved_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror"
AC_MSG_CHECKING([whether hidden visibility is supported])
AC_TRY_COMPILE([
void __attribute__((visibility ("hidden"))) bar (void) {}],,
[quadmath_hidden=yes],[quadmath_hidden=no])
AC_MSG_RESULT($quadmath_hidden)
if test x$quadmath_hidden = xyes; then
  AC_DEFINE([HAVE_HIDDEN_VISIBILITY],[1],[__attribute__((visibility ("hidden"))) supported])
fi
CFLAGS="$saved_CFLAGS"

# Check for symbol versioning (copied from libssp).
AC_MSG_CHECKING([whether symbol versioning is supported])
AC_ARG_ENABLE(symvers,
AS_HELP_STRING([--disable-symvers],
  [disable symbol versioning for libquadmath]),
quadmath_use_symver=$enableval,
quadmath_use_symver=yes)
if test "x$quadmath_use_symver" != xno; then
  if test x$gcc_no_link = xyes; then
    # If we cannot link, we cannot build shared libraries, so do not use
    # symbol versioning.
    quadmath_use_symver=no
  else
    save_LDFLAGS="$LDFLAGS"
    LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
    cat > conftest.map <<EOF
FOO_1.0 {
  global: *foo*; bar; local: *;
};
EOF
    AC_TRY_LINK([int foo;],[],[quadmath_use_symver=gnu],[quadmath_use_symver=no])
    if test x$quadmath_use_symver = xno; then
      case "$target_os" in
        solaris2*)
          LDFLAGS="$save_LDFLAGS"
          LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
          # Sun ld cannot handle wildcards and treats all entries as undefined.
          cat > conftest.map <<EOF
FOO_1.0 {
  global: foo; local: *;
};
EOF
          AC_TRY_LINK([int foo;],[],[quadmath_use_symver=sun],[quadmath_use_symver=no])
          ;;
      esac
    fi
    LDFLAGS="$save_LDFLAGS"
  fi
fi
AC_MSG_RESULT($quadmath_use_symver)
AM_CONDITIONAL(LIBQUAD_USE_SYMVER, [test "x$quadmath_use_symver" != xno])
AM_CONDITIONAL(LIBQUAD_USE_SYMVER_GNU, [test "x$quadmath_use_symver" = xgnu])
AM_CONDITIONAL(LIBQUAD_USE_SYMVER_SUN, [test "x$quadmath_use_symver" = xsun])

AC_CACHE_CHECK([whether __float128 is supported], [libquad_cv_have_float128],
  [GCC_TRY_COMPILE_OR_LINK([
    #if (!defined(_ARCH_PPC)) || defined(__LONG_DOUBLE_IEEE128__)
    typedef _Complex float __attribute__((mode(TC))) __complex128;
    #else
    typedef _Complex float __attribute__((mode(KC))) __complex128;
    #endif

    __float128 foo (__float128 x)
    {

     __complex128 z1, z2;

     z1 = x;
     z2 = x / 7.Q;
     z2 /= z1;

     return (__float128) z2;
    }

    __float128 bar (__float128 x)
    {
      return x * __builtin_huge_valq ();
    }
  ],[
    foo (1.2Q);
    bar (1.2Q);
  ],[
    libquad_cv_have_float128=yes
  ],[
    libquad_cv_have_float128=no
])])
AM_CONDITIONAL(BUILD_LIBQUADMATH, [test "x$libquad_cv_have_float128" = xyes])

# Check for printf hook support.
AC_MSG_CHECKING([whether printf hooks are supported])
AC_TRY_COMPILE([
#include <printf.h>
#include <stdarg.h>
#include <stdlib.h>
extern void flt128_va (void *, va_list *);
extern int flt128_ais (const struct printf_info *, size_t, int *, int *);
extern int flt128_printf_fp (FILE *, const struct printf_info *, const void *const *);
],[
int pa_flt128 = register_printf_type (flt128_va);
int mod_Q = register_printf_modifier (L"Q");
int res = register_printf_specifier ('f', flt128_printf_fp, flt128_ais);
struct printf_info info = { .user = -1 };
],
[quadmath_printf_hooks=yes],[quadmath_printf_hooks=no])
AC_MSG_RESULT($quadmath_printf_hooks)
if test x$quadmath_printf_hooks = xyes; then
  AC_DEFINE([HAVE_PRINTF_HOOKS],[1],[GNU C Library stype printf hooks supported])
fi

# Check for whether locale support for quadmath_snprintf or Q printf hooks
# should be provided.
AC_MSG_CHECKING([whether nl_langinfo should be used])
AC_TRY_COMPILE([#include <langinfo.h>],[
const char *s;
s = nl_langinfo (DECIMAL_POINT);
s = nl_langinfo (MON_DECIMAL_POINT);
s = nl_langinfo (GROUPING);
s = nl_langinfo (MON_GROUPING);
s = nl_langinfo (THOUSANDS_SEP);
s = nl_langinfo (MON_THOUSANDS_SEP);
(void) s;
],
[quadmath_use_nl_langinfo=yes],[quadmath_use_nl_langinfo=no])
AC_MSG_RESULT($quadmath_use_nl_langinfo)
if test x$quadmath_use_nl_langinfo = xyes; then
  AC_DEFINE([USE_NL_LANGINFO],[1],[whether nl_langinfo should be used])
fi

AC_MSG_CHECKING([whether nl_langinfo should be used for wide char locale info])
AC_TRY_COMPILE([#include <langinfo.h>],[
const char *s;
s = nl_langinfo (_NL_NUMERIC_DECIMAL_POINT_WC);
s = nl_langinfo (_NL_MONETARY_DECIMAL_POINT_WC);
s = nl_langinfo (_NL_NUMERIC_THOUSANDS_SEP_WC);
s = nl_langinfo (_NL_MONETARY_THOUSANDS_SEP_WC);
(void) s;
],
[quadmath_use_nl_langinfo_wc=yes],[quadmath_use_nl_langinfo_wc=no])
AC_MSG_RESULT($quadmath_use_nl_langinfo_wc)
if test x$quadmath_use_nl_langinfo_wc = xyes; then
  AC_DEFINE([USE_NL_LANGINFO_WC],[1],[whether nl_langinfo should be used for wide char locale info])
fi

AC_MSG_CHECKING([whether localeconv should be used])
AC_TRY_COMPILE([#include <locale.h>],[
const struct lconv *l = localeconv ();
const char *s;
s = l->decimal_point;
s = l->mon_decimal_point;
s = l->grouping;
s = l->mon_grouping;
s = l->thousands_sep;
s = l->mon_thousands_sep;
(void) s;
],
[quadmath_use_localeconv=yes],[quadmath_use_localeconv=no])
AC_MSG_RESULT($quadmath_use_localeconv)
if test x$quadmath_use_localeconv = xyes; then
  AC_DEFINE([USE_LOCALECONV],[1],[whether localeconv should be used])
fi

# Check for whether i18n number rewriting support for quadmath_snprintf
# or Q printf hooks should be provided.
AC_MSG_CHECKING([whether i18n number rewriting support for quadmath_snprintf should be added])
AC_TRY_COMPILE([#include <langinfo.h>
#include <limits.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>],[
const char *s;
char decimal[MB_LEN_MAX];
wctrans_t map = wctrans ("to_outpunct");
wint_t wdecimal = towctrans (L'.', map);
mbstate_t state;
memset (&state, '\0', sizeof (state));
wcrtomb (decimal, wdecimal, &state);
s = nl_langinfo (_NL_CTYPE_OUTDIGIT0_MB);
s = nl_langinfo (_NL_CTYPE_OUTDIGIT0_WC);
s = nl_langinfo (_NL_CTYPE_MB_CUR_MAX);
(void) s;
],
[quadmath_use_i18n_number_h=yes],[quadmath_use_i18n_number_h=no])
AC_MSG_RESULT($quadmath_use_i18n_number_h)
if test x$quadmath_use_i18n_number_h = xyes; then
  AC_DEFINE([USE_I18N_NUMBER_H],[1],[whether i18n number rewriting can be supported])
fi

# Add CET specific flags if CET is enabled
GCC_CET_FLAGS(CET_FLAGS)
XCFLAGS="$XCFLAGS $CET_FLAGS"

case x$target in
  xpowerpc64le*-linux*)
    AC_PREPROC_IFELSE(
      [AC_LANG_PROGRAM([[#if __SIZEOF_LONG_DOUBLE__ != 16
                         #error long double is double
                         #endif]],
                       [[(void) 0;]])],
      [XCFLAGS="$XCFLAGS -mno-gnu-attribute"])
    ;;
  *)
    ;;
esac
AC_SUBST(XCFLAGS)

AC_CACHE_SAVE

if test ${multilib} = yes; then
  multilib_arg="--enable-multilib"
else
  multilib_arg=
fi


# We would like our source tree to be readonly. However when releases or
# pre-releases are generated, the flex/bison generated files as well as the
# various formats of manuals need to be included along with the rest of the
# sources.  Therefore we have --enable-generated-files-in-srcdir to do 
# just that.
AC_MSG_CHECKING(generated-files-in-srcdir)
AC_ARG_ENABLE(generated-files-in-srcdir,
AS_HELP_STRING([--enable-generated-files-in-srcdir],
 [put copies of generated files in source dir intended for creating source tarballs for users without texinfo bison or flex]),
[case "$enableval" in
 yes) enable_generated_files_in_srcdir=yes ;;
 no)  enable_generated_files_in_srcdir=no ;;
 *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
 esac],
[enable_generated_files_in_srcdir=no])
AC_MSG_RESULT($enable_generated_files_in_srcdir)
AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)

# Determine what GCC version number to use in filesystem paths.
GCC_BASE_VER

AC_CONFIG_FILES(Makefile)
AC_OUTPUT