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dnl Process this file with autoconf to produce a configure script.
dnl Configure input file for elfutils.                     -*-autoconf-*-
dnl
dnl Copyright (C) 1996-2016 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],[0.165],[https://bugzilla.redhat.com/],[elfutils])

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

AC_COPYRIGHT([Copyright (C) 1996-2016 Red Hat, Inc.])
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

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_PROG_CC
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([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"
LDFLAGS="-shared -Wl,-z,defs,-z,relro $LDFLAGS"
AC_LINK_IFELSE([dnl
AC_LANG_PROGRAM([[#include <stdlib.h>
#undef __thread
static __thread int a; int foo (int b) { return a + b; }]],
		[[exit (foo (0));]])],
	       ac_cv_tls=yes, ac_cv_tls=no)
CFLAGS="$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

dnl Enable the linker to be build as a native-only linker.  By default it
dnl can handle all architectures but this comes at a cost.  A native
dnl will be slightly faster, small, and has fewer dependencies.
native_ld=no
AC_ARG_ENABLE([generic],
AS_HELP_STRING([--disable-generic], [do not build generic linker]), [dnl
if test "$enable_generic" = no; then
  case "$host_cpu" in
   i?86)
    AC_DEFINE(NATIVE_ELF, 32)
    native_ld=yes
    base_cpu=i386
    ;;
   *)
    AC_MSG_ERROR([no machine-specific linker for this configuration available])
    ;;
  esac
fi])
AH_TEMPLATE([NATIVE_ELF],
[Define to 32 or 64 if a specific implementation is wanted.])
AM_CONDITIONAL(NATIVE_LD, test "$native_ld" = yes)
dnl The automake generated Makefile cannot deal with macros in the name
dnl of files if at any time there is no such file, even if the filename
dnl would not be used.
AS_IF([test -z "$base_cpu"], [base_cpu=none])
AC_SUBST(base_cpu)
dnl Support to work around automake's inflexible dependency generation.
dnl See src/Makefile.am for more information.
AM_CONDITIONAL(NEVER, false)

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 "$HAVE_VALGRIND" = "no"; then
    AC_MSG_ERROR([valgrind not found])
  fi
fi
AM_CONDITIONAL(USE_VALGRIND, test "$use_valgrind" = 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_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]))
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"
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"])

dnl Check if we have argp available from our libc
AC_LINK_IFELSE(
	[AC_LANG_PROGRAM(
		[#include <argp.h>],
		[int argc=1; char *argv[]={"test"}; argp_parse(0,argc,argv,0,0,0); return 0;]
		)],
	[libc_has_argp="true"],
	[libc_has_argp="false"]
)

dnl If our libc doesn't provide argp, then test for libargp
if test "$libc_has_argp" = "false" ; then
	AC_MSG_WARN("libc does not have argp")
	AC_CHECK_LIB([argp], [argp_parse], [have_argp="true"], [have_argp="false"])

	if test "$have_argp" = "false"; then
		AC_MSG_ERROR("no libargp found")
	else
		argp_LDADD="-largp"
	fi
else
	argp_LDADD=""
fi
AC_SUBST([argp_LDADD])

dnl The directories with content.

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
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}

  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}
])