configure.ac 18.9 KB
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dnl -*- mode: shell-script; sh-indentation: 2; -*-

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dnl Process this file with autoconf to produce a configure script.

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AC_INIT([nettle], [2.5], [nettle-bugs@lists.lysator.liu.se])
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AC_PREREQ(2.61)
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AC_CONFIG_SRCDIR([arcfour.c])
# Needed to stop autoconf from looking for files in parent directories.
AC_CONFIG_AUX_DIR([.])

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AC_CONFIG_HEADER([config.h])
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LIBNETTLE_MAJOR=4
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LIBNETTLE_MINOR=3
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LIBHOGWEED_MAJOR=2
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LIBHOGWEED_MINOR=1
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AC_CANONICAL_HOST

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# Command line options
AC_ARG_WITH(include-path,
  AC_HELP_STRING([--with-include-path], [A colon-separated list of directories to search for include files]),,
  [with_include_path=''])

if test x$with_include_path != x ; then
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  CPPFLAGS="$CPPFLAGS -I`echo $with_include_path | sed 's/:/ -I/g'`"
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fi

AC_ARG_WITH(lib-path,
  AC_HELP_STRING([--with-lib-path], [A colon-separated list of directories to search for libraries]),,
  [with_lib_path=''])

if test x$with_lib_path != x ; then
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  LDFLAGS="$LDFLAGS -L`echo $with_lib_path | sed 's/:/ -L/g'`"
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fi

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AC_ARG_ENABLE(public-key,
  AC_HELP_STRING([--disable-public-key], [Disable public key algorithms]),,
  [enable_public_key=yes])

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AC_ARG_ENABLE(assembler,
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  AC_HELP_STRING([--disable-assembler],[Disable assembler code]),,
  [enable_assembler=yes])
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AC_ARG_ENABLE(shared,
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  AC_HELP_STRING([--enable-shared], [Build a shared library]),,
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  [enable_shared=no])

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AC_ARG_ENABLE(pic,
  AC_HELP_STRING([--disable-pic],
  [Do not try to compile library files as position independent code]),,
  [enable_pic=yes])

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AC_ARG_ENABLE(openssl,
  AC_HELP_STRING([--disable-openssl], [Do not include openssl glue in the benchmark program]),,
  [enable_openssl=yes])
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AC_ARG_ENABLE(gcov,
  AC_HELP_STRING([--enable-gcov], [Instrument for gcov (requires a modern gcc)]),,
  [enable_gcov=no])

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LSH_RPATH_INIT([`echo $with_lib_path | sed 's/:/ /g'` \
    `echo $exec_prefix | sed "s@^NONE@$prefix/lib@g" | sed "s@^NONE@$ac_default_prefix/lib@g"` \
    /usr/local/lib /sw/local/lib /sw/lib \
    /usr/gnu/lib /opt/gnu/lib /sw/gnu/lib /usr/freeware/lib /usr/pkg/lib])

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# Checks for programs.
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AC_PROG_CC
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# When $CC foo.c -o foo creates both foo and foo.exe, autoconf picks
# up the foo.exe and sets exeext to .exe. That is correct for cygwin,
# which has some kind of magic link from foo to foo.exe, but not for
# rntcl. A better check for the cygwin case would check if the
# contents of foo and foo.exe are equal; in the rntcl case, foo is a
# sh script, and foo.exe is a windows executable.

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if test "x$CC" = xrntcl ; then
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    AC_MSG_NOTICE([Compiling with rntcl; clearing EXEEXT and disabling assembler])
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    ac_exeext=''
    ac_cv_exeext=''
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    EXEEXT=''
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    enable_assembler=no
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fi

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# Used by the testsuite only
AC_PROG_CXX

AC_LANG_PUSH(C++)
AC_TRY_COMPILE([],[return 0;],[CXX_TESTS='cxx-test$(EXEEXT)'], [CXX_TESTS=''])
AC_SUBST([CXX_TESTS])
AC_LANG_POP

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AC_PROG_MAKE_SET
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AC_PROG_RANLIB
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AC_CHECK_TOOL(NM, nm, strings)
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# Used only for the GNU-stack configure test.
AC_CHECK_TOOL(OBJDUMP, objdump, false)
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if test "x$ac_cv_prog_cc_stdc" = xno ; then
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  AC_ERROR([the C compiler doesn't handle ANSI-C]) #'
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fi
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AC_PROG_INSTALL

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# According to the autoconf manual, needs install-sh from
# autoconf-2.60 or automake-1.10 to avoid races.
AC_PROG_MKDIR_P

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LSH_DEPENDENCY_TRACKING

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if test x$enable_dependency_tracking = xyes ; then
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  # Since the makefiles use include to get the dependency files, we must
  # make sure that the files exist. We generate some more files than are
  # actually needed.
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  AC_CONFIG_COMMANDS([dummy-dep-files],
  [(cd "$srcdir" && find . -name '*.c' -print) \
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 | sed 's/\.c$//' | (while read f; do echo > "$f.o.d"; echo > "$f.po.d"; done)
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])
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fi
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# Figure out ABI. Currently, configurable only by setting CFLAGS.
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ABI=standard

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case "$host_cpu" in
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  [x86_64 | amd64])
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    AC_TRY_COMPILE([
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#if defined(__x86_64__) || defined(__arch64__)
#error 64-bit x86
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#endif
    ], [], [
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      ABI=32
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    ], [
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      ABI=64
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    ])
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    ;;
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  *sparc*)
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    AC_TRY_COMPILE([
#if defined(__sparcv9) || defined(__arch64__)
#error 64-bit sparc
#endif
    ], [], [
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      ABI=32
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    ], [
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      ABI=64
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    ])
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    ;;
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esac

if test "x$ABI" != xstandard ; then
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  AC_MSG_NOTICE([Compiler uses $ABI-bit ABI. To change, set CC.])
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  if test "$libdir" = '${exec_prefix}/lib' ; then
    # Try setting a better default
    case "$host_cpu:$host_os:$ABI" in
      *:solaris*:32|*:sunos*:32)
	libdir='${exec_prefix}/lib'
	;;
      *:solaris*:64|*:sunos*:64)
	libdir='${exec_prefix}/lib/64'
	;;
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      # Linux conventions are a mess... According to the Linux File
      # Hierarchy Standard, all architectures except IA64 puts 32-bit
      # libraries in lib, and 64-bit in lib64. Some distributions,
      # e.g., Fedora and Gentoo, adhere to this standard, while at
      # least Debian has decided to put 64-bit libraries in lib and
      # 32-bit libraries in lib32.
      
      # We try to figure out the convention, except if we're cross
      # compiling. We use lib${ABI} if /usr/lib${ABI} exists and
      # appears to not be a symlink to a different name.
      *:linux*:32|*:linux*:64)
	if test "$cross_compiling" = yes ; then
          AC_MSG_WARN([Cross compiling for linux. Can't guess if libraries go in lib${ABI} or lib.]); dnl '
	else
	  # The dash builtin pwd tries to be "helpful" and remember
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	  # symlink names. Use -P option, and hope it's portable enough.
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	  test -d /usr/lib${ABI} \
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	    && (cd /usr/lib${ABI} && pwd -P | grep >/dev/null "/lib${ABI}"'$') \
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	    && libdir='${exec_prefix}/'"lib${ABI}"
	fi
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	;;
      # On freebsd, it seems 32-bit libraries are in lib32,
      # and 64-bit in lib. Don't know about "kfreebsd", does
      # it follow the Linux fhs conventions?
      *:freebsd*:32)
	libdir='${exec_prefix}/lib32'
	;;
      *:freebsd*:64)
	libdir='${exec_prefix}/lib'
	;;
      *)
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        AC_MSG_WARN([Don't know where to install $ABI-bit libraries on this system.]); dnl '
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    esac
    AC_MSG_NOTICE([Libraries to be installed in $libdir.])
  fi
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fi

# Select assembler code
asm_path=
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if test "x$enable_assembler" = xyes ; then
  case "$host_cpu" in
    [i?86* | k[5-8]* | pentium* | athlon])
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      asm_path=x86
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      ;;
    [x86_64 | amd64])
      if test "$ABI" = 64 ; then
	asm_path=x86_64
      else
	asm_path=x86
      fi
      ;;
    *sparc*)
      if test "$ABI" = 64 ; then
	asm_path=sparc64
      else
	asm_path=sparc32
      fi
      ;;
    *)
      enable_assembler=no
      ;;
  esac
fi
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# echo "enable_assembler: $enable_assembler, asm_path: $asm_path"
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if test "x$enable_assembler" = xyes ; then
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  if test -n "$asm_path"; then
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    AC_MSG_NOTICE([Looking for assembler files in $asm_path/.])
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    found=no
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    for tmp_f in aes-encrypt-internal.asm aes-decrypt-internal.asm \
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		 arcfour-crypt.asm camellia-crypt-internal.asm \
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		 md5-compress.asm memxor.asm \
		 serpent-encrypt.asm serpent-decrypt.asm \
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		 sha1-compress.asm machine.m4; do
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#       echo "Looking for $srcdir/$asm_path/$tmp_f"
      if test -f "$srcdir/$asm_path/$tmp_f"; then
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#        echo found
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        found=yes
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        AC_CONFIG_LINKS($tmp_f:$asm_path/$tmp_f)
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      fi
    done
    if test "$found" = no; then
      enable_assembler=no
      AC_MSG_WARN([No assembler files found.])
    fi
  fi
fi

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LSH_CCPIC

SHLIBCFLAGS="$CCPIC"
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IF_DLL='#'
LIBNETTLE_FILE_SRC='$(LIBNETTLE_FORLINK)'
LIBHOGWEED_FILE_SRC='$(LIBHOGWEED_FORLINK)'
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EMULATOR=''
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case "$host_os" in
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  mingw32*|cygwin*)
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    # The actual DLLs, e.g. libnettle-$major-$minor.dll, are normally
    # installed into the bin dir (or more exactly $libdir/../bin, for
    # automake), while libnettle.dll.a, which is a stub file for
    # linking to the DLL, is installed into the lib dir.
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    case "$host_os" in
      mingw32*)
        LIBNETTLE_FORLINK='libnettle-$(LIBNETTLE_MAJOR)-$(LIBNETTLE_MINOR).dll'
        LIBHOGWEED_FORLINK='libhogweed-$(LIBHOGWEED_MAJOR)-$(LIBHOGWEED_MINOR).dll'
        ;;
      cygwin*)
        LIBNETTLE_FORLINK='cygnettle-$(LIBNETTLE_MAJOR)-$(LIBNETTLE_MINOR).dll'
        LIBHOGWEED_FORLINK='cyghogweed-$(LIBHOGWEED_MAJOR)-$(LIBHOGWEED_MINOR).dll'
        ;;
    esac
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    # FIXME: Support native compilation using mingw on windows.
    case "$ABI" in
    64)
        EMULATOR=wine64
        ;;
    *)
        EMULATOR=wine
        ;;
    esac
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    LIBNETTLE_SONAME=''
    LIBNETTLE_FILE='libnettle.dll.a'
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    LIBNETTLE_FILE_SRC='$(LIBNETTLE_FILE)'
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    LIBNETTLE_LINK='$(CC) $(LDFLAGS) -shared -Wl,--out-implib=$(LIBNETTLE_FILE) -Wl,--export-all-symbols -Wl,--enable-auto-import -Wl,--whole-archive'
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    LIBNETTLE_LIBS='-Wl,--no-whole-archive $(LIBS)'

    LIBHOGWEED_SONAME=''
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    LIBHOGWEED_FILE='libhogweed.dll.a'
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    LIBHOGWEED_FILE_SRC='$(LIBHOGWEED_FILE)'
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    LIBHOGWEED_LINK='$(CC) $(LDFLAGS) -shared -Wl,--out-implib=$(LIBHOGWEED_FILE) -Wl,--export-all-symbols -Wl,--enable-auto-import -Wl,--whole-archive'
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    LIBHOGWEED_LIBS='-Wl,--no-whole-archive $(LIBS) libnettle.dll.a'
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    IF_DLL=''
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    ;;
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  darwin*)
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    LIBNETTLE_FORLINK=libnettle.dylib
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    LIBNETTLE_SONAME='libnettle.$(LIBNETTLE_MAJOR).dylib'
    LIBNETTLE_FILE='libnettle.$(LIBNETTLE_MAJOR).$(LIBNETTLE_MINOR).dylib'
    LIBNETTLE_LINK='$(CC) -dynamiclib $(LDFLAGS) -install_name ${libdir}/$(LIBNETTLE_SONAME) -compatibility_version $(LIBNETTLE_MAJOR) -current_version $(LIBNETTLE_MAJOR).$(LIBNETTLE_MINOR)'
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    LIBNETTLE_LIBS=''

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    LIBHOGWEED_FORLINK=libhogweed.dylib
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    LIBHOGWEED_SONAME='libhogweed.$(LIBHOGWEED_MAJOR).dylib'
    LIBHOGWEED_FILE='libhogweed.$(LIBHOGWEED_MAJOR).$(LIBHOGWEED_MINOR).dylib'
    LIBHOGWEED_LINK='$(CC) -dynamiclib -L. $(LDFLAGS) -install_name ${libdir}/$(LIBHOGWEED_SONAME) -compatibility_version $(LIBHOGWEED_MAJOR) -current_version $(LIBHOGWEED_MAJOR).$(LIBHOGWEED_MINOR)'
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    LIBHOGWEED_LIBS='-lnettle -lgmp'
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    ;;
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  solaris*)
    # Sun's ld uses -h to set the soname, and this option is passed
    # through by both Sun's compiler and gcc. Might not work with GNU
    # ld, but it's unusual to use GNU ld on Solaris.
    LIBNETTLE_FORLINK=libnettle.so
    LIBNETTLE_SONAME='$(LIBNETTLE_FORLINK).$(LIBNETTLE_MAJOR)'
    LIBNETTLE_FILE='$(LIBNETTLE_SONAME).$(LIBNETTLE_MINOR)'
    LIBNETTLE_LINK='$(CC) $(LDFLAGS) -G -h $(LIBNETTLE_SONAME)'
    LIBNETTLE_LIBS=''

    LIBHOGWEED_FORLINK=libhogweed.so
    LIBHOGWEED_SONAME='$(LIBHOGWEED_FORLINK).$(LIBHOGWEED_MAJOR)'
    LIBHOGWEED_FILE='$(LIBHOGWEED_SONAME).$(LIBHOGWEED_MINOR)'
    LIBHOGWEED_LINK='$(CC) $(LDFLAGS) -L. -G -h $(LIBHOGWEED_SONAME)'
    LIBHOGWEED_LIBS='-lnettle -lgmp'
    ;;
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  *)
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    LIBNETTLE_FORLINK=libnettle.so
    LIBNETTLE_SONAME='$(LIBNETTLE_FORLINK).$(LIBNETTLE_MAJOR)'
    LIBNETTLE_FILE='$(LIBNETTLE_SONAME).$(LIBNETTLE_MINOR)'
    LIBNETTLE_LINK='$(CC) $(LDFLAGS) -shared -Wl,-soname=$(LIBNETTLE_SONAME)'
    LIBNETTLE_LIBS=''

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    LIBHOGWEED_FORLINK=libhogweed.so
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    LIBHOGWEED_SONAME='$(LIBHOGWEED_FORLINK).$(LIBHOGWEED_MAJOR)'
    LIBHOGWEED_FILE='$(LIBHOGWEED_SONAME).$(LIBHOGWEED_MINOR)'
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    LIBHOGWEED_LINK='$(CC) $(LDFLAGS) -L. -shared -Wl,-soname=$(LIBHOGWEED_SONAME)'
    # Requested by debian, to make linking with only -lhogweed work
    # (does not work in general, e.g., with static linking all of
    # -lhogweed -lgmp -lnettle are still required). Also makes dlopen
    # of libhogweed.so work, without having to use RTLD_GLOBAL.
    # Depends on -L. above, to locate nettle.so.
    LIBHOGWEED_LIBS='-lnettle -lgmp'
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    ;;
esac
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if test "x$enable_pic" = xyes; then
  CCPIC_MAYBE="$CCPIC"
else
  CCPIC_MAYBE=''
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fi
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AC_SUBST([CCPIC_MAYBE])
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ASM_SYMBOL_PREFIX=''
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ASM_ELF_STYLE='no'
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ASM_TYPE_FUNCTION=''
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ASM_MARK_NOEXEC_STACK=''
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ASM_ALIGN_LOG=''
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if test x$enable_assembler = xyes ; then
  AC_CACHE_CHECK([if globals are prefixed by underscore],
  nettle_cv_asm_underscore,
  [ # Default is no underscore
    nettle_cv_asm_underscore=no
    AC_COMPILE_IFELSE(
      [int a_global_symbol;],
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      [ $NM conftest.$OBJEXT >conftest.out
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        if grep _a_global_symbol conftest.out >/dev/null ; then
          nettle_cv_asm_underscore=yes
        elif grep a_global_symbol conftest.out >/dev/null ; then
          nettle_cv_asm_underscore=no
        else
          AC_MSG_WARN([nm doesn't list a_global_symbol at all])
	fi],
      [AC_MSG_WARN([test program with a single global could not be compiled!?])])])
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  if test x$nettle_cv_asm_underscore = xyes ; then
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    ASM_SYMBOL_PREFIX='_'
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  fi
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  AC_CACHE_CHECK([if we should use a .note.GNU-stack section],
  nettle_cv_asm_gnu_stack,
  [ # Default
    nettle_cv_asm_gnu_stack=no

    cat >conftest.c <<EOF
int foo() { return 0; }
EOF
    nettle_compile="$CC $CFLAGS $CPPFLAGS -c conftest.c >conftest.out 2>&1"
    if AC_TRY_EVAL(nettle_compile); then
      cat conftest.out >&AC_FD_CC
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      $OBJDUMP -x conftest.o | grep '\.note\.GNU-stack' > /dev/null \
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      && nettle_cv_asm_gnu_stack=yes
    else
      cat conftest.out >&AC_FD_CC
      echo "configure: failed program was:" >&AC_FD_CC
      cat conftest.s >&AC_FD_CC
    fi
    rm -f conftest.*])
  if test x$nettle_cv_asm_gnu_stack = xyes ; then
    ASM_MARK_NOEXEC_STACK='.section .note.GNU-stack,"",@progbits'
  fi

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  AC_CACHE_CHECK([for ELF-style .type,%function pseudo-ops],
    [nettle_cv_asm_type_percent_function],
    [GMP_TRY_ASSEMBLE([
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.text
.globl foo
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.type foo,%function
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foo:
.Lend:

.size foo, .Lend - foo
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],
       [nettle_cv_asm_type_percent_function=yes],
       [nettle_cv_asm_type_percent_function=no])])

dnl Needs double quote for the # character
  AC_CACHE_CHECK([[for ELF-style .type,#function pseudo-ops]],
    [nettle_cv_asm_type_hash_function],
    [GMP_TRY_ASSEMBLE([
.text
.globl foo
.type foo,#function
foo:
.Lend:

.size foo, .Lend - foo
],
       [nettle_cv_asm_type_hash_function=yes],
       [nettle_cv_asm_type_hash_function=no])])

  if test x$nettle_cv_asm_type_percent_function = xyes ; then
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    ASM_ELF_STYLE='yes'
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    ASM_TYPE_FUNCTION='%function'
  else
    if test x$nettle_cv_asm_type_hash_function = xyes ; then
      ASM_ELF_STYLE='yes'
      ASM_TYPE_FUNCTION='#function'
    fi
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  fi
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  AC_CACHE_CHECK([if .align assembly directive is logarithmic],
    [nettle_cv_asm_align_log],
    [GMP_TRY_ASSEMBLE([
.align 3
],
       [nettle_cv_asm_align_log=yes],
       [nettle_cv_asm_align_log=no])])
  if test x$nettle_cv_asm_align_log = xyes ; then
    ASM_ALIGN_LOG='yes'
  fi
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fi

AC_SUBST(ASM_SYMBOL_PREFIX)
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AC_SUBST(ASM_ELF_STYLE)
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AC_SUBST(ASM_TYPE_FUNCTION)
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AC_SUBST(ASM_MARK_NOEXEC_STACK)
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AC_SUBST(ASM_ALIGN_LOG)
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AC_SUBST(EMULATOR)
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AC_SUBST(SHLIBCFLAGS)
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AC_SUBST(LIBNETTLE_MAJOR)
AC_SUBST(LIBNETTLE_MINOR)
AC_SUBST(LIBNETTLE_FORLINK)
AC_SUBST(LIBNETTLE_SONAME)
AC_SUBST(LIBNETTLE_FILE)
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AC_SUBST(LIBNETTLE_FILE_SRC)
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AC_SUBST(LIBNETTLE_LINK)
AC_SUBST(LIBNETTLE_LIBS)

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AC_SUBST(LIBHOGWEED_MAJOR)
AC_SUBST(LIBHOGWEED_MINOR)
AC_SUBST(LIBHOGWEED_FORLINK)
AC_SUBST(LIBHOGWEED_SONAME)
AC_SUBST(LIBHOGWEED_FILE)
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AC_SUBST(LIBHOGWEED_FILE_SRC)
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AC_SUBST(LIBHOGWEED_LINK)
AC_SUBST(LIBHOGWEED_LIBS)
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AC_PATH_PROG(M4, m4, m4)
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if test "x$enable_gcov" = "xyes"; then
  CFLAGS="$CFLAGS -ftest-coverage -fprofile-arcs"
fi

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# Checks for typedefs, structures, and compiler characteristics.
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AC_C_CONST
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AC_C_INLINE
AC_TYPE_UID_T
AC_TYPE_SIZE_T
AC_HEADER_TIME
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AC_CHECK_SIZEOF(long)
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AC_CHECK_ALIGNOF(uint64_t)

ALIGNOF_UINT64_T="$ac_cv_alignof_uint64_t"
AC_SUBST(ALIGNOF_UINT64_T)
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AC_CHECK_HEADERS([openssl/blowfish.h openssl/des.h openssl/cast.h openssl/aes.h],,
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[enable_openssl=no
 break])

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LSH_FUNC_ALLOCA
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LSH_FUNC_STRERROR
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# Needed by the supplied memcmp.c
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AC_C_BIGENDIAN
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AC_REPLACE_FUNCS(memxor)

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LSH_GCC_ATTRIBUTES
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# According to Simon Josefsson, looking for uint32_t and friends in
# sys/types.h is needed on some systems, in particular cygwin.
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AX_CREATE_STDINT_H([nettle-stdint.h], [sys/types.h])
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# Check for file locking. We (AC_PROG_CC?) have already checked for
# sys/types.h and unistd.h.
AC_CACHE_CHECK([for fcntl file locking],
		nettle_cv_fcntl_locking,
[AC_TRY_COMPILE([
#if HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <fcntl.h>
],[
int op = F_SETLKW;
struct flock fl;
],
nettle_cv_fcntl_locking=yes,
nettle_cv_fcntl_locking=no)])

AH_TEMPLATE([HAVE_FCNTL_LOCKING], [Define if fcntl file locking is available])
if test "x$nettle_cv_fcntl_locking" = "xyes" ; then
  AC_DEFINE(HAVE_FCNTL_LOCKING)
fi

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# Checks for libraries
AC_CHECK_LIB(gmp, __gmpz_getlimbn,,
    [AC_MSG_WARN(
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[GNU MP not found, or not 3.1 or up, see http://gmplib.org/.
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Support for public key algorithms will be unavailable.])]
    enable_public_key=no)

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# Add -R flags needed to run programs linked with gmp
LSH_RPATH_FIX

AH_TEMPLATE([HAVE_MPZ_POWM_SEC], [Define if mpz_powm_sec is available (appeared in GMP-5)])
AC_CHECK_FUNC(__gmpz_powm_sec, [AC_DEFINE(HAVE_MPZ_POWM_SEC)])

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AH_TEMPLATE([WITH_HOGWEED], [Defined if public key features are enabled])

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if test "x$enable_public_key" = xyes ; then
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  AC_DEFINE(WITH_HOGWEED)
  IF_HOGWEED=''
else
  IF_HOGWEED='#'
fi

if test "x$enable_shared" = xyes ; then
  IF_SHARED=''
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else
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  IF_SHARED='#'
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fi

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AC_SUBST(IF_HOGWEED)
AC_SUBST(IF_SHARED)
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AC_SUBST(IF_DLL)
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OPENSSL_LIBFLAGS=''

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# Check for openssl's libcrypto (used only for benchmarking)
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if test x$enable_openssl = xyes ; then
  AC_CHECK_LIB(crypto, BF_ecb_encrypt,
    [OPENSSL_LIBFLAGS='-lcrypto'],
    [enable_openssl=no])
fi

AH_TEMPLATE([WITH_OPENSSL],
	    [Define if you have openssl's libcrypto (used for benchmarking)])

if test x$enable_openssl = xyes ; then
  AC_DEFINE(WITH_OPENSSL)
fi
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AC_SUBST(OPENSSL_LIBFLAGS)
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# Choose strategy for Camellia round
AH_BOTTOM(
[/* Needs include of <limits.h> before use. */
#define HAVE_NATIVE_64_BIT (SIZEOF_LONG * CHAR_BIT >= 64)
])

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# clock_gettime is in librt on *-*-osf5.1 and on glibc, so add -lrt to
# BENCH_LIBS if needed. On linux (tested on x86_32, 2.6.26),
# clock_getres reports ns accuracy, while in a quick test on osf
# clock_getres said only 1 millisecond.

old_LIBS="$LIBS"
AC_SEARCH_LIBS(clock_gettime, rt, [
  AC_DEFINE([HAVE_CLOCK_GETTIME],1,[Define to 1 if you have the `clock_gettime' function])])
BENCH_LIBS="$LIBS"
LIBS="$old_LIBS"

AC_SUBST(BENCH_LIBS)

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# Set these flags *last*, or else the test programs won't compile
if test x$GCC = xyes ; then
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  # Using -ggdb3 makes (some versions of) Redhat's gcc-2.96 dump core
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  if $CC --version | grep '^2\.96$' 1>/dev/null 2>&1; then
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    true
  else
    CFLAGS="$CFLAGS -ggdb3"
  fi
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  # FIXME: It would be better to actually test if this option works and/or is needed.
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  # Or perhaps use -funsigned-char.
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  if $CC --version | grep 'gcc.* 4\.' 1>/dev/null 2>&1; then
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    CFLAGS="$CFLAGS -Wno-pointer-sign"
  fi
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  CFLAGS="$CFLAGS -Wall -W \
  -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes \
  -Wpointer-arith -Wbad-function-cast -Wnested-externs"
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# Don't enable -Wcast-align as it results in tons of warnings in the
# DES code. And when using stdio.
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# Don't enable -Waggregate-return, as that causes warnings for glibc
# inttypes.h.
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fi
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AC_CONFIG_FILES([config.make config.m4 Makefile])
AC_CONFIG_FILES([tools/Makefile testsuite/Makefile examples/Makefile])
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AC_CONFIG_FILES([nettle.pc hogweed.pc])
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AC_OUTPUT
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AC_MSG_NOTICE([summary of build options:

  Version:           ${PACKAGE_STRING}
  Host type:         ${host}
  ABI:               ${ABI}
  Assembly files:    ${asm_path:-none}
  Install prefix:    ${prefix}
  Library directory: ${libdir}
  Compiler:          ${CC}
  Shared libraries:  ${enable_shared}
  Public key crypto: ${enable_public_key}
])