configure.ac

# Configure script template for the Run-time System of GHC
#
# Process with 'autoreconf' to get a working configure script.
#
# For the generated configure script, do "./configure --help" to
# see what flags are available. (Better yet, read the documentation!)
#

AC_INIT([GHC run-time system], [1.0.2], [libraries@haskell.org], [rts])

AC_CONFIG_MACRO_DIRS([../m4])

# Safety check: Ensure that we are in the correct source directory.
AC_CONFIG_SRCDIR([include/rts/Constants.h])

dnl * We require autoconf version 2.69 due to
dnl   https://bugs.ruby-lang.org/issues/8179. Also see #14910.
dnl * We need 2.50 due to the use of AC_SYS_LARGEFILE and AC_MSG_NOTICE.
dnl * We need 2.52 due to the use of AS_TR_CPP and AS_TR_SH.
dnl * Using autoconf 2.59 started to give nonsense like this
dnl     #define SIZEOF_CHAR 0
dnl   recently.
AC_PREREQ([2.69])

AC_CONFIG_HEADERS([ghcautoconf.h.autoconf])

# We have to run these unconditionally, but we may discard their
# results in the following code
AC_CANONICAL_BUILD
AC_CANONICAL_HOST

GHC_CONVERT_PLATFORM_PARTS([host], [Host])
FPTOOLS_SET_PLATFORM_VARS([host], [Host])
FPTOOLS_SET_HASKELL_PLATFORM_VARS([Host])

dnl ** check for eventfd which is needed by the I/O manager
AC_CHECK_HEADERS([sys/eventfd.h])
AC_CHECK_FUNCS([eventfd])

AC_CHECK_FUNCS([getpid getuid raise])

dnl ** Check for __thread support in the compiler
AC_MSG_CHECKING(for __thread support)
AC_COMPILE_IFELSE(
  [ AC_LANG_SOURCE([[__thread int tester = 0;]]) ],
  [
   AC_MSG_RESULT(yes)
   AC_DEFINE([CC_SUPPORTS_TLS],[1],[Define to 1 if __thread is supported])
  ],
  [
   AC_MSG_RESULT(no)
   AC_DEFINE([CC_SUPPORTS_TLS],[0],[Define to 1 if __thread is supported])
  ])

dnl large address space support (see rts/include/rts/storage/MBlock.h)
dnl
dnl Darwin has vm_allocate/vm_protect
dnl Linux has mmap(MAP_NORESERVE)/madv(MADV_DONTNEED)
dnl FreeBSD, Solaris and maybe other have MAP_NORESERVE/MADV_FREE
dnl (They also have MADV_DONTNEED, but it means something else!)
dnl
dnl Windows has VirtualAlloc MEM_RESERVE/MEM_COMMIT, however
dnl it counts page-table space as committed memory, and so quickly
dnl runs out of paging file when we have multiple processes reserving
dnl 1TB of address space, we get the following error:
dnl    VirtualAlloc MEM_RESERVE 1099512676352 bytes failed: The paging file is too small for this operation to complete.
dnl

AC_ARG_ENABLE(large-address-space,
    [AS_HELP_STRING([--enable-large-address-space],
        [Use a single large address space on 64 bit systems (enabled by default on 64 bit platforms)])],
    EnableLargeAddressSpace=$enableval,
    EnableLargeAddressSpace=yes
)

use_large_address_space=no
AC_CHECK_SIZEOF([void *])
if test "$ac_cv_sizeof_void_p" -eq 8 ; then
    if test "x$EnableLargeAddressSpace" = "xyes" ; then
        if test "$ghc_host_os" = "darwin" ; then
            use_large_address_space=yes
        elif test "$ghc_host_os" = "openbsd" ; then
            # as of OpenBSD 5.8 (2015), OpenBSD does not support mmap with MAP_NORESERVE.
            # The flag MAP_NORESERVE is supported for source compatibility reasons,
            # but is completely ignored by OS mmap
                  use_large_address_space=no
        elif test "$ghc_host_os" = "mingw32" ; then
            # as of Windows 8.1/Server 2012 windows does no longer allocate the page
            # tabe for reserved memory eagerly. So we are now free to use LAS there too.
                  use_large_address_space=yes
        else
            AC_CHECK_DECLS([MAP_NORESERVE, MADV_FREE, MADV_DONTNEED],[],[],
                [
                #include <unistd.h>
                #include <sys/types.h>
                #include <sys/mman.h>
                #include <fcntl.h>
            ])
            if test "$ac_cv_have_decl_MAP_NORESERVE" = "yes" &&
                test "$ac_cv_have_decl_MADV_FREE" = "yes" ||
                test "$ac_cv_have_decl_MADV_DONTNEED" = "yes" ; then
                    use_large_address_space=yes
            fi
        fi
    fi
fi
if test "$use_large_address_space" = "yes" ; then
   AC_DEFINE([USE_LARGE_ADDRESS_SPACE], [1], [Enable single heap address space support])
fi

dnl ** Use MMAP in the runtime linker?
dnl --------------------------------------------------------------

case ${HostOS} in
    linux|linux-android|freebsd|dragonfly|netbsd|openbsd|kfreebsdgnu|gnu|solaris2)
        RtsLinkerUseMmap=1
        ;;
    darwin|ios|watchos|tvos)
        RtsLinkerUseMmap=1
        ;;
    *)
        # Windows (which doesn't have mmap) and everything else.
        RtsLinkerUseMmap=0
        ;;
    esac

AC_DEFINE_UNQUOTED([RTS_LINKER_USE_MMAP], [$RtsLinkerUseMmap],
                   [Use mmap in the runtime linker])

dnl ** ARM outline atomics
dnl --------------------------------------------------------------
FP_ARM_OUTLINE_ATOMICS

dnl ** IPE data compression
dnl --------------------------------------------------------------
AC_DEFINE_UNQUOTED([HAVE_LIBZSTD], [$CABAL_FLAG_libzstd], [Define to 1 if you
  wish to compress IPE data in compiler results (requires libzstd)])

AC_DEFINE_UNQUOTED([STATIC_LIBZSTD], [$CABAL_FLAG_static_libzstd], [Define to 1 if you
  wish to statically link the libzstd compression library in the compiler
  (requires libzstd)])

dnl ** Other RTS features
dnl --------------------------------------------------------------
AC_DEFINE_UNQUOTED([USE_LIBDW], [$CABAL_FLAG_libdw], [Set to 1 to use libdw])

AC_DEFINE_UNQUOTED([HAVE_LIBNUMA], [$CABAL_FLAG_libnuma], [Define to 1 if you have libnuma])
dnl We should have these headers if the flag is set, but check anyways
dnl in order to define `HAVE_*` macros.
AS_IF(
  [test "$CABAL_FLAG_libnuma" = 1],
  [AC_CHECK_HEADERS([numa.h numaif.h])])

dnl ** Write config files
dnl --------------------------------------------------------------

AC_OUTPUT

dnl ######################################################################
dnl Generate ghcautoconf.h
dnl ######################################################################

[
mkdir -p include
touch include/ghcautoconf.h
> include/ghcautoconf.h

echo "#if !defined(__GHCAUTOCONF_H__)" >> include/ghcautoconf.h
echo "#define __GHCAUTOCONF_H__" >> include/ghcautoconf.h
# Copy the contents of $srcdir/../mk/config.h, turning '#define PACKAGE_FOO
# "blah"' into '/* #undef PACKAGE_FOO */' to avoid clashes.
cat $srcdir/../mk/config.h ghcautoconf.h.autoconf | sed \
   -e 's,^\([	 ]*\)#[	 ]*define[	 ][	 ]*\(PACKAGE_[A-Z]*\)[	 ][ 	]*".*".*$,\1/* #undef \2 */,' \
   -e '/__GLASGOW_HASKELL/d' \
   -e '/REMOVE ME/d' \
   >> include/ghcautoconf.h
echo "#endif /* __GHCAUTOCONF_H__ */" >> include/ghcautoconf.h
]

dnl ######################################################################
dnl Generate external symbol flags (-Wl,-u...)
dnl ######################################################################

dnl See Note [Undefined symbols in the RTS]

[
symbolExtraDefs=''
if [[ "$CABAL_FLAG_find_ptr" = 1 ]]; then
    symbolExtraDefs+=' -DFIND_PTR'
fi

cat $srcdir/external-symbols.list.in \
    | "$CC" $symbolExtraDefs -E -P -traditional -Iinclude - -o - \
    | sed -e '/^ *$/d' \
    > external-symbols.list \
    || exit 1

if [[ "$CABAL_FLAG_leading_underscore" = 1 ]]; then
    sedExpr='s/^(.*)$/  "-Wl,-u,_\1"/'
else
    sedExpr='s/^(.*)$/  "-Wl,-u,\1"/'
fi
sed -E -e "${sedExpr}" external-symbols.list > external-symbols.flags
unset sedExpr
rm -f external-symbols.list
]

dnl ######################################################################
dnl Generate build-info
dnl ######################################################################

[
cat $srcdir/rts.buildinfo.in \
    | "$CC" -E -P -traditional - -o - \
    | sed -e '/^ *$/d' \
    > rts.buildinfo \
    || exit 1
rm -f external-symbols.flags
]