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# Process this file with autoreconf to produce a configure script.

#   Copyright (C) 2011, 2012 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

AC_PREREQ(2.59)

AC_INIT([GNU TM Runtime Library], 1.0,,[libitm])

AC_CONFIG_HEADER(config.h)

# -------

# Options

# -------

AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])

LIBITM_ENABLE(version-specific-runtime-libs, no, ,

   [Specify that runtime libraries should be installed in a compiler-specific directory],

   permit yes|no)

AC_MSG_RESULT($enable_version_specific_runtime_libs)

# 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([for --enable-generated-files-in-srcdir])

LIBITM_ENABLE(generated-files-in-srcdir, no, ,

   [put copies of generated files in source dir intended for creating source

    tarballs for users without texinfo bison or flex.],

   permit yes|no)

AC_MSG_RESULT($enable_generated_files_in_srcdir)

AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)

# -------

# -------

# 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

target_alias=${target_alias-$host_alias}

# Sets up automake.  Must come after AC_CANONICAL_SYSTEM.  Each of the

# following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.

#  1.9.0:  minimum required version

#  no-define:  PACKAGE and VERSION will not be #define'd in config.h (a bunch

#              of other PACKAGE_* variables will, however, and there's nothing

#              we can do about that; they come from AC_INIT).

#  foreign:  we don't follow the normal rules for GNU packages (no COPYING

#            file in the top srcdir, etc, etc), so stop complaining.

#  -Wall:  turns on all automake warnings...

#  -Wno-portability:  ...except this one, since GNU make is required.

#  -Wno-override: ... and this one, since we do want this in testsuite.

AM_INIT_AUTOMAKE([1.9.0 foreign -Wall -Wno-portability -Wno-override])

AM_ENABLE_MULTILIB(, ..)

# Calculate toolexeclibdir

# Also toolexecdir, though it's only used in toolexeclibdir

case ${enable_version_specific_runtime_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)'

      toolexeclibdir='$(toolexecdir)/lib'

    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)

# Check the compiler.

# 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

AC_PROG_CXX

AM_PROG_AS

m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])

AC_SUBST(CFLAGS)

# In order to override CFLAGS_FOR_TARGET, all of our special flags go

# in XCFLAGS.  But we need them in CFLAGS during configury.  So put them

# in both places for now and restore CFLAGS at the end of config.

save_CFLAGS="$CFLAGS"

# Find other programs we need.

AC_CHECK_TOOL(AR, ar)

AC_CHECK_TOOL(NM, nm)

AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)

AC_PATH_PROG(PERL, perl, perl-not-found-in-path-error)

AC_PROG_MAKE_SET

AC_PROG_INSTALL

# 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")

# Configure libtool

AM_PROG_LIBTOOL

AC_SUBST(enable_shared)

AC_SUBST(enable_static)

AM_MAINTAINER_MODE

# For libtool versioning info, format is CURRENT:REVISION:AGE

libtool_VERSION=1:0:0

AC_SUBST(libtool_VERSION)

# Check header files.

AC_STDC_HEADERS

AC_HEADER_TIME

ACX_HEADER_STRING

AC_CHECK_HEADERS(unistd.h semaphore.h sys/time.h malloc.h)

GCC_HEADER_STDINT(gstdint.h)

GCC_AC_FUNC_MMAP_BLACKLIST

AC_C_BIGENDIAN

# I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE.

AH_BOTTOM(

[#ifndef WORDS_BIGENDIAN

#define WORDS_BIGENDIAN 0

#endif])

# Check to see if -pthread or -lpthread is needed.  Prefer the former.

# In case the pthread.h system header is not found, this test will fail.

XPCFLAGS=""

CFLAGS="$CFLAGS -pthread"

AC_LINK_IFELSE(

 [AC_LANG_PROGRAM(

  [#include 

   void *g(void *d) { return NULL; }],

  [pthread_t t; pthread_create(&t,NULL,g,NULL);])],

 [XPCFLAGS=" -Wc,-pthread"],

 [CFLAGS="$save_CFLAGS" LIBS="-lpthread $LIBS"

  AC_LINK_IFELSE(

   [AC_LANG_PROGRAM(

    [#include 

     void *g(void *d) { return NULL; }],

    [pthread_t t; pthread_create(&t,NULL,g,NULL);])],

   [],

   [AC_MSG_ERROR([Pthreads are required to build libitm])])])

# Check for functions needed.

AC_CHECK_FUNCS(strtoull memalign posix_memalign)

# Check for broken semaphore implementation on darwin.

# sem_init returns: sem_init error: Function not implemented.

case "$host" in

  *-darwin*)

    AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,

        Define if the POSIX Semaphores do not work on your system.)

    ;;

esac

GCC_LINUX_FUTEX(:)

# See if we support thread-local storage.

GCC_CHECK_TLS

# See what sort of export controls are available.

LIBITM_CHECK_ATTRIBUTE_VISIBILITY

LIBITM_CHECK_ATTRIBUTE_DLLEXPORT

LIBITM_CHECK_ATTRIBUTE_ALIAS

# Check linker hardware capability support.

LIBITM_CHECK_LINKER_HWCAP

# If defaulting to -mavx, don't clear hwcaps.

AC_CHECK_DECL([__AVX__], [HWCAP_LDFLAGS=''])

LIBITM_ENABLE_SYMVERS

if test $enable_symvers = gnu; then

  AC_DEFINE(LIBITM_GNU_SYMBOL_VERSIONING, 1,

            [Define to 1 if GNU symbol versioning is used for libitm.])

fi

# See if we can emit unwind info in the sjlj stub.

GCC_AS_CFI_PSEUDO_OP

# Determine the proper ABI type for size_t.

LIBITM_CHECK_SIZE_T_MANGLING

# Get target configury.

. ${srcdir}/configure.tgt

if test -n "$UNSUPPORTED"; then

  AC_MSG_ERROR([Configuration ${target} is unsupported.])

fi

CFLAGS="$save_CFLAGS $XCFLAGS"

# Check for __sync_val_compare_and_swap, but only after the target has

# had a chance to set XCFLAGS.

LIBITM_CHECK_SYNC_BUILTINS

LIBITM_CHECK_64BIT_SYNC_BUILTINS

LIBITM_CHECK_AS_AVX

GCC_CHECK_ELF_STYLE_WEAKREF

# Cleanup and exit.

CFLAGS="$save_CFLAGS"

AC_CACHE_SAVE

# Add -Wall -Werror if we are using GCC.

if test "x$GCC" = "xyes"; then

  XCFLAGS="$XCFLAGS -Wall -Werror"

fi

XCFLAGS="$XCFLAGS $XPCFLAGS"

AC_SUBST(config_path)

AC_SUBST(XCFLAGS)

AC_SUBST(XLDFLAGS)

if test ${multilib} = yes; then

  multilib_arg="--enable-multilib"

else

  multilib_arg=

fi

# Set up the set of libraries that we need to link against for libitm.

# Note that the GTM_SELF_SPECS in gcc.c will force -pthread for -fgnu-tm,

# which will force linkage against -lpthread (or equivalent for the system).

# That's not 100% ideal, but about the best we can do easily.

if test $enable_shared = yes; then

  link_itm="-litm %{static: $LIBS}"

else

  link_itm="-litm $LIBS"

fi

AC_SUBST(link_itm)

AM_CONDITIONAL([ARCH_ARM], [test "$ARCH" = arm])

AM_CONDITIONAL([ARCH_X86], [test "$ARCH" = x86])

AM_CONDITIONAL([ARCH_X86_AVX], [test "$libitm_cv_as_avx" = yes])

AM_CONDITIONAL([ARCH_FUTEX], [test $enable_linux_futex = yes])

AC_CONFIG_FILES(Makefile testsuite/Makefile libitm.spec)

AC_OUTPUT