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# Process this file with autoconf to produce a configure script, like so:

# aclocal -I .. -I ../config && autoconf && autoheader && automake

AC_PREREQ(2.64)

AC_INIT(libmudflap, 1.0)

AC_CONFIG_SRCDIR(mf-runtime.c)

AC_CANONICAL_SYSTEM

ACX_NONCANONICAL_TARGET

AM_INIT_AUTOMAKE

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

AC_ARG_ENABLE(version-specific-runtime-libs,

[  --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)

AM_MAINTAINER_MODE

AC_EXEEXT

AM_ENABLE_MULTILIB(, ..)

target_alias=${target_alias-$host_alias}

AC_SUBST(target_alias)

AC_CONFIG_HEADERS(config.h)

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)

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

  AC_MSG_ERROR([libmudflap must be built with GCC])

fi

AC_PROG_CPP

# Some hosts don't have dlsym(RTLD_NEXT, "symbol") for use in

# symbol interposition.  We disable shared libraries for these.

AC_MSG_CHECKING([whether dlsym(RTLD_NEXT,...) is available])

AC_TRY_COMPILE([

#define _GNU_SOURCE

#include 

],

[void *foo = dlsym (RTLD_NEXT, "exit");],

[AC_MSG_RESULT(yes)],

[AC_MSG_RESULT(no)

enable_shared=no])

AC_CHECK_HEADERS(stdint.h execinfo.h signal.h dlfcn.h dirent.h pwd.h grp.h \

  netdb.h sys/ipc.h sys/sem.h sys/shm.h sys/wait.h ctype.h mntent.h \

  sys/socket.h netinet/in.h arpa/inet.h dlfcn.h sys/mman.h)

AC_CHECK_FUNCS(backtrace backtrace_symbols gettimeofday signal)

AC_CHECK_FUNCS(fopen64 fseeko64 ftello64 stat64 freopen64)

AC_CHECK_FUNCS(setbuf setbuffer setlinebuf setvbuf)

AC_CHECK_FUNCS(strnlen memrchr strncpy memmem sethostname)

AC_CHECK_FUNCS(__ctype_b_loc __ctype_tolower_loc __ctype_toupper_loc)

AC_CHECK_FUNCS(getlogin cuserid getpwnam getpwuid getpwent getgrnam getgrgid getgrent)

AC_CHECK_FUNCS(getlogin_r getpwnam_r getpwuid_r getgrnam_r getgrgid_r)

AC_CHECK_FUNCS(getservent getservbyname getservbyport getaddrinfo gai_strerror)

AC_CHECK_FUNCS(getprotoent getprotobyname getprotobynumber)

AC_CHECK_FUNCS(getmntent setmntent addmntent)

AC_CHECK_FUNCS(inet_ntoa mmap munmap)

AC_CHECK_FUNCS(__libc_freeres)

AC_TRY_COMPILE([#include 

#include 

#include ],[union semun foo;], [mf_have_semun=1], [mf_have_semun=0])

if test $mf_have_semun = 1

then

  AC_DEFINE(HAVE_UNION_SEMUN, 1, [union semun defined in sys/ipc.h or sys/sem.h])

fi

AC_MSG_CHECKING([for socklen_t in sys/socket.h])

AC_TRY_COMPILE([#define _POSIX_PII_SOCKET

#include 

#include ], [socklen_t x = 5;],

  [AC_DEFINE(HAVE_SOCKLEN_T, 1, [Define it socklen_t typedef is in sys/socket.h.])

   AC_MSG_RESULT(yes)],

  [AC_MSG_RESULT(no)])

AC_LIBTOOL_DLOPEN

AM_PROG_LIBTOOL

AC_SUBST(enable_shared)

AC_SUBST(enable_static)

AC_CHECK_HEADER(stdint.h, [MF_HAVE_STDINT_H=1], [MF_HAVE_STDINT_H=0])

AC_SUBST(MF_HAVE_STDINT_H)

if test $MF_HAVE_STDINT_H = 1

then

   MF_HAVE_UINTPTR_T=1

else

   AC_TRY_COMPILE([#include ], [uintptr_t k = 0;],

        [MF_HAVE_UINTPTR_T=1], [MF_HAVE_UINTPTR_T=0])

fi

AC_SUBST(MF_HAVE_UINTPTR_T)

if test ! -d pth

then

  # libmudflapth objects are built in this subdirectory

  mkdir pth

fi

AC_CHECK_HEADERS(pthread.h)

AC_MSG_CHECKING([for thread model used by GCC])

target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`

AC_MSG_RESULT([$target_thread_file])

# We only support posix threads, or no threads at all.

posix_threads=

case ${target_thread_file} in

  posix)

    posix_threads=yes

    ;;

  single)

    ;;

  *)

    echo "${target_thread_file} is an unsupported thread package" 1>&2

    exit 1

    ;;

esac

AM_CONDITIONAL(LIBMUDFLAPTH, [test "x$posix_threads" != "x"])

if test "x$posix_threads" != "x"

then

        build_libmudflapth=1

else

        build_libmudflapth=0

fi

AC_SUBST(build_libmudflapth)

AC_CHECK_LIB(dl, dlsym)

# 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)'

      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)

includedir=${toolexecdir}/include

AC_SUBST(includedir)

pthread_create_version='""'

if test "x$enable_shared" = "xyes" && test "x$posix_threads" != "x"; then

  # NB: don't check for -lpthread here, because then it would be

  # added to LIBS.  For the thread-unaware libmudflap.la, we don't

  # want it there.

  # glibc-related hacks.  dlsym() may pick the wrong version of

  # interposed functions like pthread_create on modern glibc.

  # We need to find the proper symbol version string, and use

  # the nonstandard dlvsym().

  AC_CHECK_FUNCS(dlvsym)

  AC_CHECK_TOOL(NM, nm)

  if test "x$ac_cv_have_dlvsym" != "x"; then

    # Try compiling a simple pthreads program.  Find the shared libraries it

    # ends up with.  Then use "nm" on those libraries to extract the

    # default symbol versioning suffix ("@@"), if any.  But that's tricky.

    # Rather, run nm on the resulting executable.  Unfortunately, autoconf

    # doesn't appear to have a macro that builds a test executable for

    # subsequent analysis ... so we do it by hand here.

    cat >> conftest.c << EOF

#include 

int main () { void *p = (void *) & pthread_create; return (int) p; }

EOF

    oldLIBS="$LIBS"

    LIBS="$LIBS -lpthread"

    pthread_create_version="\"\""

    AC_MSG_CHECKING(pthread_create symbol version)

    if eval $ac_link 2>&5 && test -s conftest${ac_exeext}; then

      version=`$NM conftest${ac_exeect} | grep 'pthread_create@@' | sed -e 's/^.*@@//'`

      if test "x$version" != "x"; then

        pthread_create_version="\"$version\""

      fi

    fi

    AC_MSG_RESULT($pthread_create_version)

    LIBS="$oldLIBS"

  fi

fi

AC_DEFINE_UNQUOTED(PTHREAD_CREATE_VERSION, $pthread_create_version, [pthread_create symbol version])

# Figure out whether the compiler supports "-ffunction-sections -fdata-sections",

# similarly to how libstdc++ does it

ac_test_CFLAGS="${CFLAGS+set}"

ac_save_CFLAGS="$CFLAGS"

# Check for -ffunction-sections -fdata-sections

AC_MSG_CHECKING([for gcc that supports -ffunction-sections -fdata-sections])

CFLAGS='-Werror -ffunction-sections -fdata-sections'

AC_TRY_COMPILE(, [int foo;], [ac_fdsections=yes], [ac_fdsections=no])

if test "$ac_test_CFLAGS" = set; then

  CFLAGS="$ac_save_CFLAGS"

else

  # this is the suspicious part

  CFLAGS=""

fi

if test x"$ac_fdsections" = x"yes"; then

  SECTION_FLAGS='-ffunction-sections -fdata-sections'

fi

AC_MSG_RESULT($ac_fdsections)

AC_SUBST(SECTION_FLAGS)

# Check for the name of the symbol used for the entry point.

AC_CACHE_CHECK([for the name of the symbol used for the entry point],

  [mudflap_cv_entry_point], [

for name in _start __start unknown; do

  AC_LINK_IFELSE([AC_LANG_PROGRAM([extern char $name@<:@@:>@;], [$name@<:@0@:>@ = 0;])],

                 [break])

done

mudflap_cv_entry_point="$name"])

if test "$mudflap_cv_entry_point" = unknown; then

  AC_MSG_ERROR([none of the known symbol names works])

fi

AC_DEFINE_UNQUOTED([ENTRY_POINT], [$mudflap_cv_entry_point],

  [Define to the name of the symbol used for the entry point.])

if test ${multilib} = yes; then

  multilib_arg="--enable-multilib"

else

  multilib_arg=

fi

# See if we support thread-local storage.

GCC_CHECK_TLS

GCC_CHECK_EMUTLS

AC_CONFIG_FILES([Makefile testsuite/Makefile testsuite/mfconfig.exp])

AC_OUTPUT