path: root/configure.ac

dnl Process this file with autoconf to produce a configure script.
dnl Configure input file for elfutils.                     -*-autoconf-*-
dnl
dnl Copyright (C) 1996-2018 Red Hat, Inc.
dnl
dnl This file is part of elfutils.
dnl
dnl  This file is free software; you can redistribute it and/or modify
dnl  it under the terms of the GNU General Public License as published by
dnl  the Free Software Foundation; either version 3 of the License, or
dnl  (at your option) any later version.
dnl
dnl  elfutils is distributed in the hope that it will be useful, but
dnl  WITHOUT ANY WARRANTY; without even the implied warranty of
dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl  GNU General Public License for more details.
dnl
dnl  You should have received a copy of the GNU General Public License
dnl  along with this program.  If not, see <http://www.gnu.org/licenses/>.
AC_INIT([elfutils],[0.175],[https://sourceware.org/bugzilla],[elfutils],[http://elfutils.org/])

dnl Workaround for older autoconf < 2.64
m4_ifndef([AC_PACKAGE_URL],
         [AC_DEFINE([PACKAGE_URL], ["http://elfutils.org/"],
                    [Define to home page for this package])
          AC_SUBST([PACKAGE_URL], ["http://elfutils.org/"])])

# We want eu- as default program prefix if none was given by the user.
# But if the user explicitly provided --program-prefix="" then pretend
# it wasn't set at all (NONE). We want to test this really early before
# configure has a chance to use the value.

if test "x$program_prefix" = "xNONE"; then
  AC_MSG_NOTICE([No --program-prefix given, using "eu-"])
  program_prefix="eu-"
elif test "x$program_prefix" = "x"; then
  AC_MSG_NOTICE([Using no program-prefix])
  program_prefix=NONE
fi

AC_CONFIG_AUX_DIR([config])
AC_CONFIG_FILES([config/Makefile])

AC_COPYRIGHT([Copyright (C) 1996-2018 The elfutils developers.])
AC_PREREQ(2.63)			dnl Minimum Autoconf version required.

dnl We use GNU make extensions; automake 1.10 defaults to -Wportability.
AM_INIT_AUTOMAKE([gnits 1.11 -Wno-portability dist-bzip2 no-dist-gzip parallel-tests])
AM_MAINTAINER_MODE

AM_SILENT_RULES([yes])

AC_CONFIG_SRCDIR([libelf/libelf.h])
AC_CONFIG_FILES([Makefile])
AC_CONFIG_HEADERS([config.h])

AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_FILES([m4/Makefile])

dnl The RPM spec file.  We substitute a few values in the file.
AC_CONFIG_FILES([elfutils.spec:config/elfutils.spec.in])


AC_CANONICAL_HOST

case "$host_os" in
	cygwin*|mingw*|msys*)
		LIBEXT=".dll"
		LIBPREFIX=""
		eu_postfix_lib_version="no"
		;;
	darwin)
		LIBEXT=".dylib"
		LIBPREFIX="lib"
		eu_postfix_lib_version="no"
		;;
	*)
		LIBEXT=".so"
		LIBPREFIX="lib"
		eu_postfix_lib_version="yes"
		;;
esac

AC_SUBST([LIBEXT])
AC_DEFINE_UNQUOTED(LIBEXT, "$LIBEXT")
AH_TEMPLATE([LIBEXT], [Host system file name extension for dynamic libraries.])
AC_SUBST([LIBPREFIX])
AC_DEFINE_UNQUOTED(LIBPREFIX, "$LIBPREFIX")
AH_TEMPLATE([LIBPREFIX], [Host system file name prefix for dynamic libraries.])
AM_CONDITIONAL(POSTFIX_LIB_VERSION, test "$eu_postfix_lib_version" = "yes")
AM_CONDITIONAL(NATIVE_ELF, test "$LIBEXT" = ".so")
AM_CONDITIONAL(NATIVE_PE, test "$LIBEXT" = ".dll")
AM_CONDITIONAL(NATIVE_MACHO, test "$LIBEXT" = ".dylib")

eu_LIBNAME(elf,1)
eu_LIBNAME(dw,1)
eu_LIBNAME(asm,1)
eu_LIBNAME(eu_compat,1)

AC_ARG_ENABLE(deterministic-archives,
[AS_HELP_STRING([--enable-deterministic-archives],
		[ar and ranlib default to -D behavior])], [
if test "${enableval}" = no; then
  default_ar_deterministic=false
else
  default_ar_deterministic=true
fi], [default_ar_deterministic=false])
AC_DEFINE_UNQUOTED(DEFAULT_AR_DETERMINISTIC, $default_ar_deterministic,
		   [Should ar and ranlib use -D behavior by default?])

AC_ARG_ENABLE([thread-safety],
AS_HELP_STRING([--enable-thread-safety],
               [enable thread safety of libraries EXPERIMENTAL]),
               use_locks=$enableval, use_locks=no)
AM_CONDITIONAL(USE_LOCKS, test "$use_locks" = yes)
AS_IF([test "$use_locks" = yes], [AC_DEFINE(USE_LOCKS)])
AS_IF([test "$use_locks" = yes],
      [AC_MSG_WARN([thread-safety is EXPERIMENTAL tests might fail.])])

AH_TEMPLATE([USE_LOCKS], [Defined if libraries should be thread-safe.])

AC_ARG_ENABLE([gnulib],
AS_HELP_STRING([--enable-gnulib],
               [use gnulib modules to replace functionality missing from libc. This affects the license choices for the resulting binaries.]),
               use_gnulib=$enableval, use_gnulib=no)
AM_CONDITIONAL(USE_GNULIB, test "$use_gnulib" = yes)

AC_ARG_ENABLE([install-featuresh],
AS_HELP_STRING([--enable-install-featuresh],
	       [install a dummy features.h header]),
	       install_featuresh=$enableval, install_featuresh=no)
AM_CONDITIONAL(INSTALL_FEATURESH, test "$install_featuresh" = yes)

AC_PROG_CC

gl_EARLY

AC_PROG_RANLIB
AC_PROG_YACC
AM_PROG_LEX
# Only available since automake 1.12
m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
AC_CHECK_TOOL([READELF], [readelf])
AC_CHECK_TOOL([NM], [nm])

# We use -std=gnu99 but have explicit checks for some language constructs
# and GNU extensions since some compilers claim GNU99 support, but don't
# really support all language extensions. In particular we need
# Mixed Declarations and Code
# https://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html
# Nested Functions
# https://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html
# Arrays of Variable Length
# https://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html
AC_CACHE_CHECK([for gcc with GNU99 support], ac_cv_c99, [dnl
old_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -std=gnu99"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([dnl
int foo (int a)
{
  for (int i = 0; i < a; ++i) if (i % 4) break; int s = a; return s;
}

double bar (double a, double b)
{
  double square (double z) { return z * z; }
  return square (a) + square (b);
}

void baz (int n)
{
  struct S { int x[[n]]; };
}])],
		  ac_cv_c99=yes, ac_cv_c99=no)
CFLAGS="$old_CFLAGS"])
AS_IF([test "x$ac_cv_c99" != xyes],
      AC_MSG_ERROR([gcc with GNU99 support required]))

AC_CACHE_CHECK([whether gcc supports __attribute__((visibility()))],
	ac_cv_visibility, [dnl
save_CFLAGS="$CFLAGS"
CFLAGS="$save_CFLAGS -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([dnl
int __attribute__((visibility("hidden")))
foo (int a)
{
  return a;
}])], ac_cv_visibility=yes, ac_cv_visibility=no)
CFLAGS="$save_CFLAGS"])
if test "$ac_cv_visibility" = "yes"; then
	AC_DEFINE([HAVE_VISIBILITY], [1],
		  [Defined if __attribute__((visibility())) is supported])
fi

AC_CACHE_CHECK([whether gcc supports __attribute__((gcc_struct))],
	ac_cv_gcc_struct, [dnl
save_CFLAGS="$CFLAGS"
CFLAGS="$save_CFLAGS -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([dnl
struct test { int x; } __attribute__((gcc_struct));
])], ac_cv_gcc_struct=yes, ac_cv_gcc_struct=no)
CFLAGS="$save_CFLAGS"])
if test "$ac_cv_gcc_struct" = "yes"; then
	AC_DEFINE([HAVE_GCC_STRUCT], [1],
		  [Defined if __attribute__((gcc_struct)) is supported])
fi

AC_CACHE_CHECK([whether gcc supports -fPIC], ac_cv_fpic, [dnl
save_CFLAGS="$CFLAGS"
CFLAGS="$save_CFLAGS -fPIC -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE()], ac_cv_fpic=yes, ac_cv_fpic=no)
CFLAGS="$save_CFLAGS"
])
if test "$ac_cv_fpic" = "yes"; then
	fpic_CFLAGS="-fPIC"
else
	fpic_CFLAGS=""
fi
AC_SUBST([fpic_CFLAGS])

AC_CACHE_CHECK([whether gcc supports -fPIE], ac_cv_fpie, [dnl
save_CFLAGS="$CFLAGS"
CFLAGS="$save_CFLAGS -fPIE -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE()], ac_cv_fpie=yes, ac_cv_fpie=no)
CFLAGS="$save_CFLAGS"
])
if test "$ac_cv_fpie" = "yes"; then
	fpie_CFLAGS="-fPIE"
else
	fpie_CFLAGS=""
fi
AC_SUBST([fpie_CFLAGS])

dso_LDFLAGS="-shared"

ZDEFS_LDFLAGS="-Wl,-z,defs"
AC_CACHE_CHECK([whether gcc supports $ZDEFS_LDFLAGS], ac_cv_zdefs, [dnl
save_LDFLAGS="$LDFLAGS"
LDFLAGS="$ZDEFS_LDFLAGS $save_LDFLAGS"
AC_LINK_IFELSE([AC_LANG_PROGRAM()], ac_cv_zdefs=yes, ac_cv_zdefs=no)
LDFLAGS="$save_LDFLAGS"
])
if test "$ac_cv_zdefs" = "yes"; then
	dso_LDFLAGS="$dso_LDFLAGS $ZDEFS_LDFLAGS"
fi

ZRELRO_LDFLAGS="-Wl,-z,relro"
AC_CACHE_CHECK([whether gcc supports $ZRELRO_LDFLAGS], ac_cv_zrelro, [dnl
save_LDFLAGS="$LDFLAGS"
LDFLAGS="$ZRELRO_LDFLAGS $save_LDFLAGS"
AC_LINK_IFELSE([AC_LANG_PROGRAM()], ac_cv_zrelro=yes, ac_cv_zrelro=no)
LDFLAGS="$save_LDFLAGS"
])
if test "$ac_cv_zrelro" = "yes"; then
	dso_LDFLAGS="$dso_LDFLAGS $ZRELRO_LDFLAGS"
fi

AC_SUBST([dso_LDFLAGS])

AC_CACHE_CHECK([for rpath support], ac_cv_rpath, [dnl
save_LDFLAGS="$LDFLAGS"
LDFLAGS="$save_LDFLAGS -Wl,--enable-new-dtags,-rpath,/foo/bar"
AC_LINK_IFELSE([AC_LANG_PROGRAM()], ac_cv_rpath=yes, ac_cv_rpath=no)
LDFLAGS="$save_LDFLAGS"
])
if test "$ac_cv_rpath" = "no"; then
	AC_MSG_WARN([rpath is not supported. libdw will not automatically
	             find the ebl backends.])
fi
AM_CONDITIONAL(RPATH, test "$ac_cv_rpath" = "yes")

AC_CACHE_CHECK([for __thread support], ac_cv_tls, [dnl
# Use the same flags that we use for our DSOs, so the test is representative.
# Some old compiler/linker/libc combinations fail some ways and not others.
save_CFLAGS="$CFLAGS"
save_LDFLAGS="$LDFLAGS"
CFLAGS="$fpic_CFLAGS $CFLAGS"
LDFLAGS="$dso_LDFLAGS $LDFLAGS"
AC_LINK_IFELSE([dnl
AC_LANG_PROGRAM([[#include <stdlib.h>
#undef __thread
static __thread int a; int foo (int b) { return a + b; }]],
		[[exit (foo (0));]])],
	       ac_cv_tls=yes, ac_cv_tls=no)
CFLAGS="$save_CFLAGS"
LDFLAGS="$save_LDFLAGS"])
AS_IF([test "x$ac_cv_tls" != xyes],
      AC_MSG_ERROR([__thread support required]))

dnl This test must come as early as possible after the compiler configuration
dnl tests, because the choice of the file model can (in principle) affect
dnl whether functions and headers are available, whether they work, etc.
AC_SYS_LARGEFILE

AC_CHECK_HEADER(fts.h)
AM_CONDITIONAL(HAVE_FTS_H, [test "x$ac_cv_header_fts_h" = "xyes"])
if test "x$ac_cv_header_fts_h" = "xyes"; then
  dnl Older glibc had a broken fts that didn't work with Large File Systems.
  dnl We want the version that can handler LFS, but include workaround if we
  dnl get a bad one. Add define to CFLAGS (not AC_DEFINE it) since we need to
  dnl check it before including config.h (which might define _FILE_OFFSET_BITS).
  AC_CACHE_CHECK([whether fts.h is bad when included (with LFS)], ac_cv_bad_fts,
    [AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <fts.h>]])],
			ac_cv_bad_fts=no, ac_cv_bad_fts=yes)])
fi
AS_IF([test "x$ac_cv_bad_fts" = "xyes"], [CFLAGS="$CFLAGS -DBAD_FTS=1"])

# See if we can add -D_FORTIFY_SOURCE=2. Don't do it if it is already
# (differently) defined or if it generates warnings/errors because we
# don't use the right optimisation level (string.h will warn about that).
AC_MSG_CHECKING([whether to add -D_FORTIFY_SOURCE=2 to CFLAGS])
case "$CFLAGS" in
  *-D_FORTIFY_SOURCE=2*)
    AC_MSG_RESULT([no, already there])
    ;;
  *)
    save_CFLAGS="$CFLAGS"
    CFLAGS="-D_FORTIFY_SOURCE=2 -Werror $CFLAGS"
    AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
      #include <string.h>
      int main() { return 0; }
    ]])], [ AC_MSG_RESULT([yes])
            CFLAGS="-D_FORTIFY_SOURCE=2 $save_CFLAGS" ],
          [ AC_MSG_RESULT([no])
            CFLAGS="$save_CFLAGS"])
  ;;
esac

dnl enable debugging of branch prediction.
AC_ARG_ENABLE([debugpred],
AS_HELP_STRING([--enable-debugpred],[build binaries with support to debug branch prediction]),
[use_debugpred=$enableval], [use_debugpred=no])
case $use_debugpred in
 yes) use_debugpred_val=1 ;;
 *)   use_debugpred_val=0 ;;
esac
AC_SUBST([DEBUGPRED], $use_debugpred_val)

dnl Enable gprof suport.
AC_ARG_ENABLE([gprof],
AS_HELP_STRING([--enable-gprof],[build binaries with gprof support]), [use_gprof=$enableval], [use_gprof=no])
if test "$use_gprof" = yes; then
  CFLAGS="$CFLAGS -pg"
  LDFLAGS="$LDFLAGS -pg"
fi
AM_CONDITIONAL(GPROF, test "$use_gprof" = yes)

# Enable gcov suport.
AC_ARG_ENABLE([gcov],
AS_HELP_STRING([--enable-gcov],[build binaries with gcov support]), [use_gcov=$enableval], [use_gcov=no])
if test "$use_gcov" = yes; then
  CFLAGS="$CFLAGS -fprofile-arcs -ftest-coverage"
  LDFLAGS="$LDFLAGS -fprofile-arcs"
fi
AM_CONDITIONAL(GCOV, test "$use_gcov" = yes)

AC_ARG_ENABLE([sanitize-undefined],
              AS_HELP_STRING([--enable-sanitize-undefined],
                             [Use gcc undefined behaviour sanitizer]),
                             [use_undefined=$enableval], [use_undefined=no])
if test "$use_undefined" = yes; then
  old_CFLAGS="$CFLAGS"
  old_CXXFLAGS="$CXXFLAGS"
  # We explicitly use unaligned access when possible (see ALLOW_UNALIGNED)
  # We want to fail immediately on first error, don't try to recover.
  CFLAGS="$CFLAGS -fsanitize=undefined -fno-sanitize-recover"
  CXXFLAGS="$CXXFLAGS -fsanitize=undefined -fno-sanitize-recover"
  AC_LINK_IFELSE([AC_LANG_SOURCE([int main (int argc, char **argv) { return 0; }])], use_undefined=yes, use_undefined=no)
  AS_IF([test "x$use_undefined" != xyes],
        AC_MSG_WARN([gcc undefined behaviour sanitizer not available])
        CFLAGS="$old_CFLAGS" CXXFLAGS="$old_CXXFLAGS")
fi
case $use_undefined in
 yes) check_undefined_val=1 ;;
 *)   check_undefined_val=0 ;;
esac
AC_DEFINE_UNQUOTED(CHECK_UNDEFINED, $check_undefined_val,
		   [Building with -fsanitize=undefined or not])

AC_ARG_ENABLE([valgrind],
AS_HELP_STRING([--enable-valgrind],[run all tests under valgrind]),
[use_valgrind=$enableval], [use_valgrind=no])
if test "$use_valgrind" = yes; then
  AC_CHECK_PROG(HAVE_VALGRIND, valgrind, yes, no)
  if test "$HAVE_VALGRIND" = "no"; then
    AC_MSG_WARN([valgrind not found])
    use_valgrind=no
  fi
fi
AM_CONDITIONAL(USE_VALGRIND, test "$use_valgrind" = yes)

AC_ARG_ENABLE([install-elfh],
AS_HELP_STRING([--enable-install-elfh],[install elf.h in include dir]),
               [install_elfh=$enableval], [install_elfh=no])
AM_CONDITIONAL(INSTALL_ELFH, test "$install_elfh" = yes)

AM_CONDITIONAL(BUILD_STATIC, [dnl
test "$use_gprof" = yes -o "$use_gcov" = yes])

AC_ARG_ENABLE([tests-rpath],
AS_HELP_STRING([--enable-tests-rpath],[build $ORIGIN-using rpath into tests]),
	       [tests_use_rpath=$enableval], [tests_use_rpath=no])
AM_CONDITIONAL(TESTS_RPATH, test "$tests_use_rpath" = yes)

LIBEBL_SUBDIR="$PACKAGE"
AC_ARG_ENABLE([libebl-subdir],
AS_HELP_STRING([--enable-libebl-subdir=DIR],
[install libebl_CPU modules in $(libdir)/DIR]), [dnl
LIBEBL_SUBDIR="$enable_libebl_subdir"])
AC_SUBST([LIBEBL_SUBDIR])
AC_DEFINE_UNQUOTED(LIBEBL_SUBDIR, "$LIBEBL_SUBDIR")
AH_TEMPLATE([LIBEBL_SUBDIR], [$libdir subdirectory containing libebl modules.])

dnl zlib is mandatory.
save_LIBS="$LIBS"
LIBS=
eu_ZIPLIB(zlib,ZLIB,z,gzdirect,gzip)
AS_IF([test "x$with_zlib" = xno], [AC_MSG_ERROR([zlib not found but is required])])
LIBS="$save_LIBS"

dnl Test for bzlib and xz/lzma, gives BZLIB/LZMALIB .am
dnl conditional and config.h USE_BZLIB/USE_LZMALIB #define.
save_LIBS="$LIBS"
LIBS=
eu_ZIPLIB(bzlib,BZLIB,bz2,BZ2_bzdopen,bzip2)
# We need this since bzip2 doesn't have a pkgconfig file.
BZ2_LIB="$LIBS"
AC_SUBST([BZ2_LIB])
eu_ZIPLIB(lzma,LZMA,lzma,lzma_auto_decoder,[LZMA (xz)])
AS_IF([test "x$with_lzma" = xyes], [LIBLZMA="liblzma"], [LIBLZMA=""])
AC_SUBST([LIBLZMA])
zip_LIBS="$LIBS"
LIBS="$save_LIBS"
AC_SUBST([zip_LIBS])

AC_CHECK_DECLS([powerof2],[],[],[#include <sys/param.h>])

AC_CHECK_DECLS([basename],[],[],
               [#define _GNU_SOURCE
                #include <string.h>])
AM_CONDITIONAL(HAVE_BASENAME, [test "x$ac_cv_have_decl_basename" = "xyes"])

if test "x$ac_cv_have_decl_basename" != "xyes"; then
	AC_DEFINE([USE_REPLACEMENT_BASENAME], [1], [Use hand-rolled basename() replacement.])
fi
AH_VERBATIM([USE_REPLACEMENT_BASENAME],
	[/* Define basename() here if it is not available from a system header. */
#undef USE_REPLACEMENT_BASENAME
#ifdef USE_REPLACEMENT_BASENAME
char *basename(const char *path);
#endif
])

AC_FUNC_STRERROR_R

AC_CHECK_FUNCS([process_vm_readv])

AC_CHECK_LIB([stdc++], [__cxa_demangle], [dnl
AC_DEFINE([USE_DEMANGLE], [1], [Defined if demangling is enabled])])
AM_CONDITIONAL(DEMANGLE, test "x$ac_cv_lib_stdcpp___cxa_demangle" = "xyes")
AS_IF([test "x$ac_cv_lib_stdcpp___cxa_demangle" = "xyes"],
      [enable_demangler=yes],[enable_demangler=no])

AC_ARG_ENABLE([textrelcheck],
AS_HELP_STRING([--disable-textrelcheck],
               [Disable textrelcheck being a fatal error]))
AM_CONDITIONAL(FATAL_TEXTREL, [test "x$enable_textrelcheck" != "xno"])
AS_IF([test "x$enable_textrelcheck" != "xno"],
      [enable_textrelcheck=yes],[enable_textrelcheck=no])

AC_ARG_ENABLE([symbol-versioning],
AS_HELP_STRING([--disable-symbol-versioning],
               [Disable symbol versioning in shared objects]))

AC_CACHE_CHECK([whether symbol versioning is supported], ac_cv_symbol_versioning, [dnl
AC_COMPILE_IFELSE([AC_LANG_SOURCE([dnl
#define NEW_VERSION(name, version) \
  asm (".symver " #name "," #name "@@@" #version);
int foo(int x) { return x + 1; }
NEW_VERSION (foo, ELFUTILS_12.12)
])], ac_cv_symbol_versioning=yes, ac_cv_symbol_versioning=no)])
if test "$ac_cv_symbol_versioning" = "no"; then
    if test "x$enable_symbol_versioning" != "xno"; then
        AC_MSG_ERROR([Symbol versioning is not supported.
                      Use --disable-symbol-versioning to build without.])
    fi
fi

AM_CONDITIONAL(SYMBOL_VERSIONING, [test "x$enable_symbol_versioning" != "xno"])
AS_IF([test "x$enable_symbol_versioning" = "xno"],
      [AC_MSG_WARN([Disabling symbol versioning breaks ABI compatibility.])
       enable_symbol_versioning=no],[enable_symbol_versioning=yes])

AC_CACHE_CHECK([whether gcc accepts -Wstack-usage], ac_cv_stack_usage, [dnl
old_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wstack-usage=262144 -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([])],
		  ac_cv_stack_usage=yes, ac_cv_stack_usage=no)
CFLAGS="$old_CFLAGS"])
AM_CONDITIONAL(ADD_STACK_USAGE_WARNING, [test "x$ac_cv_stack_usage" != "xno"])

# -Wlogical-op was too fragile in the past, make sure we get a sane one.
AC_CACHE_CHECK([whether gcc has a sane -Wlogical-op], ac_cv_logical_op, [dnl
old_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wlogical-op -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[#define FLAG 1
	int f (int r, int f) { return (r && (FLAG || (FLAG & f))); }])],
		  ac_cv_logical_op=yes, ac_cv_logical_op=no)
CFLAGS="$old_CFLAGS"])
AM_CONDITIONAL(SANE_LOGICAL_OP_WARNING,
	       [test "x$ac_cv_logical_op" != "xno"])

# -Wduplicated-cond was added by GCC6
AC_CACHE_CHECK([whether gcc accepts -Wduplicated-cond], ac_cv_duplicated_cond, [dnl
old_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wduplicated-cond -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([])],
		  ac_cv_duplicated_cond=yes, ac_cv_duplicated_cond=no)
CFLAGS="$old_CFLAGS"])
AM_CONDITIONAL(HAVE_DUPLICATED_COND_WARNING,
	       [test "x$ac_cv_duplicated_cond" != "xno"])

# -Wnull-dereference was added by GCC6
AC_CACHE_CHECK([whether gcc accepts -Wnull-dereference], ac_cv_null_dereference, [dnl
old_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wnull-dereference -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([])],
		  ac_cv_null_dereference=yes, ac_cv_null_dereference=no)
CFLAGS="$old_CFLAGS"])
AM_CONDITIONAL(HAVE_NULL_DEREFERENCE_WARNING,
	       [test "x$ac_cv_null_dereference" != "xno"])

# -Wimplicit-fallthrough was added by GCC7
AC_CACHE_CHECK([whether gcc accepts -Wimplicit-fallthrough], ac_cv_implicit_fallthrough, [dnl
old_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wimplicit-fallthrough -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([])],
		  ac_cv_implicit_fallthrough=yes, ac_cv_implicit_fallthrough=no)
CFLAGS="$old_CFLAGS"])
AM_CONDITIONAL(HAVE_IMPLICIT_FALLTHROUGH_WARNING,
	       [test "x$ac_cv_implicit_fallthrough" != "xno"])

# Assume the fallthrough attribute is supported if -Wimplict-fallthrough is supported
if test "$ac_cv_implicit_fallthrough" = "yes"; then
	AC_DEFINE([HAVE_FALLTHROUGH], [1],
		  [Defined if __attribute__((fallthrough)) is supported])
fi

dnl Check if gettext is available form libc
AC_LINK_IFELSE(
	[AC_LANG_PROGRAM(
		[#include <libintl.h>],
		[dgettext("foo", "bar"); return 0;]
		)],
	[libc_has_gettext="true"],
	[libc_has_gettext="false"]
)

dnl If our libc doesn't provide gettext, then test for libintl
if test "$libc_has_gettext" = "false" ; then
	AC_MSG_WARN("libc does not have gettext")
	AC_CHECK_LIB([intl], [dgettext], [have_intl="true"], [have_intl="false"], [-liconv])

	if test "$have_intl" = "false"; then
		AC_MSG_ERROR("no libintl found")
	else
		intl_LDADD="-lintl -liconv"
	fi
else
	intl_LDADD=""
fi
AC_SUBST([intl_LDADD])

AC_CHECK_DECLS([BYTE_ORDER], [], [], [[#include <endian.h>]])
AM_CONDITIONAL(HAVE_ENDIAN_H, [test "x$ac_cv_have_decl_BYTE_ORDER" = "xyes"])

AC_CHECK_DECLS([bswap_32], [], [], [[#include <byteswap.h>]])
AM_CONDITIONAL(HAVE_BYTESWAP_H, [test "x$ac_cv_have_decl_bswap_32" = "xyes"])

AC_CHECK_HEADERS(sys/mman.h)
AM_CONDITIONAL(HAVE_SYS_MMAN_H, [test "x$ac_cv_header_sys_mman_h" = "xyes"])
if test "x$ac_cv_header_sys_mman_h" != "xyes"; then
	AC_CHECK_DECLS([MapViewOfFile], [], [], [[#include <windows.h>]])
fi
AM_CONDITIONAL(USE_WIN32_MMAN, [test "x$ac_cv_have_decl_MapViewOfFile" = "xyes"])

AC_CHECK_DECLS([sysconf], [], [], [[#include <unistd.h>]])
AM_CONDITIONAL(HAVE_SYSCONF, [test "x$ac_cv_have_decl_sysconf" = "xyes"])
if test "x$ac_cv_have_decl_sysconf" != "xyes"; then
	AC_CHECK_DECLS([GetSystemInfo], [], [], [[#include <sysinfoapi.h>]])
fi
AM_CONDITIONAL(USE_WIN32_SYSCONF, [test "x$ac_cv_have_decl_GetSystemInfo" = "xyes"])

if test "x$ac_cv_have_decl_GetSystemInfo" = "xyes"; then
	AC_DEFINE([USE_WIN32_SYSCONF], [1], [Use sysconf replacement for win32])
fi

AH_VERBATIM([USE_WIN32_SYSCONF],
	[/* Define sysconf(3) here if it is not available from a system header. */
#undef USE_WIN32_SYSCONF
#ifdef USE_WIN32_SYSCONF
#define _SC_PAGESIZE 1
long sysconf(int name);
#endif
])

AC_CHECK_HEADERS(ar.h)
AM_CONDITIONAL(HAVE_AR_H, [test "x$ac_cv_header_ar_h" = "xyes"])

AC_CHECK_HEADERS(features.h)
AM_CONDITIONAL(HAVE_FEATURES_H, [test "x$ac_cv_header_features_h" = "xyes"])

AC_CHECK_HEADERS(stdio_ext.h)
AM_CONDITIONAL(HAVE_STDIO_EXT_H, [test "x$ac_cv_header_stdio_ext_h" = "xyes"])

AC_CHECK_DECLS([fork], [], [], [[#include <unistd.h>]])
AC_CHECK_DECLS([feof_unlocked, ferror_unlocked, fputc_unlocked, fputs_unlocked,
		fwrite_unlocked, putc_unlocked, putchar_unlocked],
		[], [], [[#include <stdio.h>]])

AC_CHECK_DECLS([tdestroy], [], [],
	       [#include <search.h>])
if test "x$ac_cv_have_decl_tdestroy" != "xyes"; then
	AC_CHECK_MEMBERS([node_t.key, node_t.rlink, node_t.llink],
			 [have_node_t="yes"], [have_node_t="no"],
			 [#define _SEARCH_PRIVATE
			  #include <search.h>])
	if test "x$have_node_t" = "xyes"; then
		AC_DEFINE([USE_PRIVATE_TDESTROY], [1], [Implement tdestroy using private node_t from search.h])
	fi
fi
AM_CONDITIONAL(USE_PRIVATE_TDESTROY, [test "x$have_node_t" = "xyes"])

AH_VERBATIM([USE_PRIVATE_TDESTROY], [
/* Declare tdestroy here if it is not available from a system header. */
#undef USE_PRIVATE_TDESTROY
#ifdef USE_PRIVATE_TDESTROY
void tdestroy(void *root, void (*free_node)(void *nodep));
#endif
])

AC_CHECK_DECLS([posix_fallocate, posix_fadvise], [], [], [[#include <fcntl.h>]])
AC_CHECK_DECLS([fchown, fchmod], [], [], [[#include <sys/stat.h>]])

gl_INIT

dnl The directories with content.

AC_CONFIG_FILES([libgnu/Makefile])

dnl Documentation.
dnl Commented out for now.
dnl AC_CONFIG_FILES([doc/Makefile])

dnl Support library.
AC_CONFIG_FILES([lib/Makefile])

dnl ELF library.
AC_CONFIG_FILES([libelf/Makefile])

dnl Higher-level ELF support library.
AC_CONFIG_FILES([libebl/Makefile])

dnl DWARF-ELF Lower-level Functions support library.
AC_CONFIG_FILES([libdwelf/Makefile])

dnl DWARF library.
AC_CONFIG_FILES([libdw/Makefile])

dnl Higher-level DWARF support library.
AC_CONFIG_FILES([libdwfl/Makefile])

dnl CPU handling library.
AC_CONFIG_FILES([libcpu/Makefile])

dnl Assembler library.
AM_CONDITIONAL(HAVE_LIBASM, true)dnl Used in tests/Makefile.am, which see.
AC_CONFIG_FILES([libasm/Makefile])

dnl CPU-specific backend libraries.
AC_CONFIG_FILES([backends/Makefile])

dnl Tools.
AC_CONFIG_FILES([src/Makefile po/Makefile.in])

dnl Test suite.
AM_CONDITIONAL(STANDALONE, false)dnl Used in tests/Makefile.am, which see.
AC_CONFIG_FILES([tests/Makefile])

dnl pkgconfig files
AC_CONFIG_FILES([config/libelf.pc config/libdw.pc])

# Get the definitions necessary to create the Makefiles in the po
# subdirectories.  This is a small subset of the gettext rules.
AC_SUBST(USE_NLS, yes)
AM_PO_SUBDIRS

dnl Appended to the config.h file.
dnl We hide all kinds of configuration magic in lib/eu-config.h.
AH_BOTTOM([#include <eu-config.h>])

dnl Version compatibility header.
AC_CONFIG_FILES([version.h:config/version.h.in])
AC_SUBST([eu_version])

# 1.234<whatever> -> 1234<whatever>
case "$PACKAGE_VERSION" in
[[0-9]].*) eu_version=`echo "$PACKAGE_VERSION" | sed 's@\.@@'` ;;
*)     	   AC_MSG_ERROR([confused by version number '$PACKAGE_VERSION']) ;;
esac
case "$eu_version" in
*.*)
  # 1234.567 -> "1234", "567"
  eu_extra_version="${eu_version#*.}"
  eu_version="${eu_version%%.*}"
  case "$eu_extra_version" in
  [[0-9]][[0-9]][[0-9]]) ;;
  [[0-9]][[0-9]])	eu_extra_version="${eu_extra_version}0" ;;
  [[0-9]])	   	eu_extra_version="${eu_extra_version}00" ;;
  *) AC_MSG_ERROR([confused by version number '$PACKAGE_VERSION']) ;;
  esac
  ;;
*)
  eu_extra_version=000
  ;;
esac

case "$eu_version" in
      0[[0-9]][[0-9]][[0-9]]) eu_version="${eu_version#0}$eu_extra_version" ;;
[[0-9]][[0-9]][[0-9]][[0-9]]) eu_version="${eu_version}$eu_extra_version" ;;
[[0-9]][[0-9]][[0-9]])	      eu_version="${eu_version}0$eu_extra_version" ;;
[[0-9]][[0-9]])	  	      eu_version="${eu_version}00$eu_extra_version";;
*) AC_MSG_ERROR([confused by version number '$PACKAGE_VERSION']) ;;
esac

# Round up to the next release API (x.y) version.
eu_version=$(( (eu_version + 999) / 1000 ))

dnl Unique ID for this build.
MODVERSION="Build for ${LIBEBL_SUBDIR} ${eu_version} ${ac_cv_build}"
AC_SUBST([MODVERSION])
AC_DEFINE_UNQUOTED(MODVERSION, "$MODVERSION")
AH_TEMPLATE([MODVERSION], [Identifier for modules in the build.])

AC_CHECK_SIZEOF(long)

# On aarch64 before glibc 2.20 we would get the kernel user_pt_regs instead
# of the user_regs_struct from sys/user.h. They are structurally the same
# but we get either one or the other.
AC_CHECK_TYPE([struct user_regs_struct],
              [sys_user_has_user_regs=yes], [sys_user_has_user_regs=no],
              [[#include <sys/ptrace.h>]
               [#include <sys/time.h>]
               [#include <sys/user.h>]])
if test "$sys_user_has_user_regs" = "yes"; then
  AC_DEFINE(HAVE_SYS_USER_REGS, 1,
            [Define to 1 if <sys/user.h> defines struct user_regs_struct])
fi

# On a 64-bit host where can can use $CC -m32, we'll run two sets of tests.
# Likewise in a 32-bit build on a host where $CC -m64 works.
utrace_BIARCH
# `$utrace_biarch' will be `-m64' even on an uniarch i386 machine.
CC_BIARCH="$CC $utrace_biarch"
AC_SUBST([CC_BIARCH])

# In maintainer mode we really need flex and bison.
# Otherwise we really need a release dir with maintainer files generated.
if test "x$enable_maintainer_mode" = xyes; then
  AC_CHECK_PROG(HAVE_FLEX, flex, yes, no)
  if test "$HAVE_FLEX" = "no"; then
    AC_MSG_ERROR([flex needed in maintainer mode])
  fi
  AC_CHECK_PROG(HAVE_BISON, bison, yes, no)
  if test "$HAVE_BISON" = "no"; then
    AC_MSG_ERROR([bison needed in maintainer mode])
  fi
  AC_CHECK_PROG(HAVE_GAWK, gawk, yes, no)
  if test "$HAVE_GAWK" = "no"; then
    AC_MSG_ERROR([gawk needed in maintainer mode])
  fi
else
  if test ! -f ${srcdir}/libdw/known-dwarf.h; then
    AC_MSG_ERROR([No libdw/known-dwarf.h. configure --enable-maintainer-mode])
  fi
fi

# The testfiles are all compressed, we need bunzip2 when running make check
AC_CHECK_PROG(HAVE_BUNZIP2, bunzip2, yes, no)
if test "$HAVE_BUNZIP2" = "no"; then
  AC_MSG_WARN([No bunzip2, needed to run make check])
fi

AC_OUTPUT

AC_MSG_NOTICE([
=====================================================================
        elfutils: ${PACKAGE_VERSION} (eu_version: ${eu_version})
=====================================================================

    Prefix                             : ${prefix}
    Program prefix ("eu-" recommended) : ${program_prefix}
    Source code location               : ${srcdir}
    Maintainer mode                    : ${enable_maintainer_mode}
    libebl modules subdirectory        : ${LIBEBL_SUBDIR}
    build arch                         : ${ac_cv_build}

  RECOMMENDED FEATURES (should all be yes)
    gzip support                       : ${with_zlib}
    bzip2 support                      : ${with_bzlib}
    lzma/xz support                    : ${with_lzma}
    libstdc++ demangle support         : ${enable_demangler}
    File textrel check                 : ${enable_textrelcheck}
    Symbol versioning                  : ${enable_symbol_versioning}

  NOT RECOMMENDED FEATURES (should all be no)
    Experimental thread safety         : ${use_locks}
    install elf.h                      : ${install_elfh}

  OTHER FEATURES
    Deterministic archives by default  : ${default_ar_deterministic}
    Native language support            : ${USE_NLS}

  EXTRA TEST FEATURES (used with make check)
    have bunzip2 installed (required)  : ${HAVE_BUNZIP2}
    debug branch prediction            : ${use_debugpred}
    gprof support                      : ${use_gprof}
    gcov support                       : ${use_gcov}
    run all tests under valgrind       : ${use_valgrind}
    gcc undefined behaviour sanitizer  : ${use_undefined}
    use rpath in tests                 : ${tests_use_rpath}
    test biarch                        : ${utrace_cv_cc_biarch}
])

if test "$install_elfh" = yes; then
  if test "${prefix}" = "/usr/local" -o "${prefix}" = "/usr"; then
    AC_MSG_WARN([installing elf.h in ${includedir} might conflict with glibc/system elf.h])
  fi
fi