#
# When this file changes, rerun autogen.sh.
#

AC_PREREQ(2.69)
AC_INIT([libdispatch], [1.3], [https://bugs.swift.org], [libdispatch], [https://github.com/apple/swift-corelibs-libdispatch])
AC_REVISION([$$])
AC_CONFIG_AUX_DIR(config)
AC_CONFIG_HEADER([config/config_ac.h])
AC_CONFIG_MACRO_DIR([m4])
ac_clean_files=a.out.dSYM
AM_MAINTAINER_MODE

AC_CANONICAL_BUILD
AC_CANONICAL_HOST
AC_CANONICAL_TARGET

#
# Command line argument to specify build variant (default to release).
# Impacts default value of CFLAGS et al. so must come before AC_PROG_CC
#
AC_ARG_WITH([build-variant],
  [AS_HELP_STRING([--with-build-variant=release|debug|releaseassert|releasedebuginfo], [Specify build variant [default=release]])],
  [dispatch_build_variant=${withval}],
  [dispatch_build_variant=release]
)
AS_CASE([$dispatch_build_variant],
  [debug], [
    default_compiler_flags="-g -O0"
    dispatch_enable_asserts=true
    dispatch_enable_optimization=false
  ],
  [release], [
    default_compiler_flags="-O2"
    dispatch_enable_asserts=false
    dispatch_enable_optimization=true
  ],
  [releaseassert], [
    default_compiler_flags="-O2"
    dispatch_enable_asserts=true
    dispatch_enable_optimization=true
  ],
  [releasedebuginfo], [
    default_compiler_flags="-g -O2"
    dispatch_enable_asserts=false
    dispatch_enable_optimization=true
  ],
  [AC_MSG_ERROR("invalid build-variant $dispatch_build_variant")]
)
AM_CONDITIONAL(DISPATCH_ENABLE_ASSERTS, $dispatch_enable_asserts)
AM_CONDITIONAL(DISPATCH_ENABLE_OPTIMIZATION, $dispatch_enable_optimization)

: ${CFLAGS=$default_compiler_flags}
: ${CXXFLAGS=$default_compiler_flags}
: ${OBJCFLAGS=$default_compiler_flags}
: ${OBJCXXFLAGS=$default_compiler_flags}

AC_PROG_CC([clang gcc cc])
AC_PROG_CXX([clang++ g++ c++])
AC_PROG_OBJC([clang gcc cc])
AC_PROG_OBJCXX([clang++ g++ c++])

#
# Android cross-compilation support
#
AC_ARG_WITH([android-ndk],
  [AS_HELP_STRING([--with-android-ndk],
    [Android NDK location])], [
  android_ndk=${withval}
])
AC_ARG_WITH([android-ndk-gcc-version],
  [AS_HELP_STRING([--with-android-ndk-gcc-version],
    [Android NDK GCC version [defaults=4.9]])],
  [android_ndk_gcc_version=${withval}], [android_ndk_gcc_version=4.9])
AC_ARG_WITH([android-api-level],
  [AS_HELP_STRING([--with-android-api-level],
    [Android API level to link with])], [
  android_api_level=${withval}
])
AC_ARG_ENABLE([android],
  [AS_HELP_STRING([--enable-android],
    [Compile for Android])], [
  android=true

  # Override values until there's real support for multiple Android platforms
  host=armv7-none-linux-androideabi
  host_alias=arm-linux-androideabi
  host_cpu=armv7
  host_os=linux-androideabi
  host_vendor=unknown
  arch=arm

  sysroot=${android_ndk}/platforms/android-${android_api_level}/arch-${arch}
  toolchain=${android_ndk}/toolchains/${host_alias}-${android_ndk_gcc_version}/prebuilt/linux-${build_cpu}

  CFLAGS="$CFLAGS -target ${host_alias} --sysroot=${sysroot} -B${toolchain}/${host_alias}/bin"
  CXXFLAGS="$CXXFLAGS -target ${host_alias} --sysroot=${sysroot} -B${toolchain}/${host_alias}/bin"
  SWIFTC_FLAGS="-target ${host} -sdk ${sysroot} -L${toolchain}/lib/gcc/${host_alias}/${android_ndk_gcc_version}.x"
  LIBS="$LIBS -L${toolchain}/lib/gcc/${host_alias}/${android_ndk_gcc_version}.x"
  LDFLAGS="$LDFLAGS -Wc,'-target','${host_alias}','-B${toolchain}/${host_alias}/bin'"

  # FIXME: empty CFLAGS and CXXFLAGS are assumed for this to work.
  # FIXME: there should be a more elegant way to do this
  ac_configure_args=`echo $ac_configure_args | sed -e "s/ 'CFLAGS='//" -e "s/ 'CXXFLAGS='//"`
  # CFLAGS, CXXFLAGS and LIBS needs to be passed to libkqueue and libpwq
  ac_configure_args="$ac_configure_args --enable-bionic-libc 'CFLAGS=$CFLAGS' 'CXXFLAGS=$CXXFLAGS' 'LIBS=$LIBS'"
], [android=false])
AM_CONDITIONAL(ANDROID, $android)

#
# On Mac OS X, some required header files come from other source packages;
# allow specifying where those are.
#
AC_ARG_WITH([apple-libpthread-source],
  [AS_HELP_STRING([--with-apple-libpthread-source],
    [Specify path to Apple libpthread source])], [
  apple_libpthread_source_path=${withval}
  CPPFLAGS="$CPPFLAGS -isystem $apple_libpthread_source_path"
])

AC_ARG_WITH([apple-libplatform-source],
  [AS_HELP_STRING([--with-apple-libplatform-source],
    [Specify path to Apple libplatform source])], [
  apple_libplatform_source_include_path=${withval}/include
  CPPFLAGS="$CPPFLAGS -isystem $apple_libplatform_source_include_path"
])

AC_ARG_WITH([apple-xnu-source],
  [AS_HELP_STRING([--with-apple-xnu-source],
    [Specify path to Apple XNU source])], [
  apple_xnu_source_libsyscall_path=${withval}/libsyscall
  apple_xnu_source_libproc_path=${withval}/libsyscall/wrappers/libproc
  apple_xnu_source_libkern_path=${withval}/libkern
  apple_xnu_source_bsd_path=${withval}/bsd
  apple_xnu_source_osfmk_path=${withval}/osfmk
  CPPFLAGS="$CPPFLAGS -idirafter $apple_xnu_source_libkern_path -isystem $apple_xnu_source_bsd_path -isystem $apple_xnu_source_libsyscall_path -isystem $apple_xnu_source_libproc_path "
])

AC_CACHE_CHECK([for System.framework/PrivateHeaders], dispatch_cv_system_privateheaders,
  [AS_IF([test -d /System/Library/Frameworks/System.framework/PrivateHeaders],
    [dispatch_cv_system_privateheaders=yes], [dispatch_cv_system_privateheaders=no])]
)
AS_IF([test "x$dispatch_cv_system_privateheaders" != "xno"],
  [CPPFLAGS="$CPPFLAGS -isystem /System/Library/Frameworks/System.framework/PrivateHeaders"]
)

#
# On Mac OS X, libdispatch_init is automatically invoked during libSystem
# process initialization.  On other systems, it is tagged as a library
# constructor to be run by automatically by the runtime linker.
#
AC_ARG_ENABLE([libdispatch-init-constructor],
  [AS_HELP_STRING([--disable-libdispatch-init-constructor],
    [Disable libdispatch_init as a constructor])],,
  [AS_IF([test -f /usr/lib/system/libdispatch.dylib],
    [enable_libdispatch_init_constructor=no])]
)
AS_IF([test "x$enable_libdispatch_init_constructor" != "xno"],
  [AC_DEFINE(USE_LIBDISPATCH_INIT_CONSTRUCTOR, 1,
    [Define to tag libdispatch_init as a constructor])]
)

#
# On Mac OS X libdispatch can use the non-portable direct pthread TSD functions
#
AC_ARG_ENABLE([apple-tsd-optimizations],
  [AS_HELP_STRING([--enable-apple-tsd-optimizations],
    [Use non-portable pthread TSD optimizations for Mac OS X.])]
)
AS_IF([test "x$enable_apple_tsd_optimizations" = "xyes"],
  [AC_DEFINE(USE_APPLE_TSD_OPTIMIZATIONS, 1,
    [Define to use non-portable pthread TSD optimizations for Mac OS X)])]
)

#
# Enable building Swift overlay support into libdispatch
#
AC_ARG_WITH([swift-toolchain],
  [AS_HELP_STRING([--with-swift-toolchain], [Specify path to Swift toolchain])],
  [swift_toolchain_path=${withval}
   AC_DEFINE(HAVE_SWIFT, 1, [Define if building for Swift])
   SWIFTC="$swift_toolchain_path/bin/swiftc"
   case $target_os in
      *android*)
	    os_string="android"
	    ;;
      linux*)
	    os_string="linux"
	    case $target_cpu in
		    armv7l*)
			target_cpu="armv7"
			;;
			*)
            esac
	    ;;
	  *)
        os_string=$target_os
		;;
	esac
   SWIFT_LIBDIR="$swift_toolchain_path/lib/swift/$os_string/$target_cpu"
   have_swift=true],
  [have_swift=false]
)
AM_CONDITIONAL(HAVE_SWIFT, $have_swift)
AC_SUBST([SWIFTC])
AC_SUBST([SWIFTC_FLAGS])
AC_SUBST([SWIFT_LIBDIR])
AC_SUBST([OS_STRING], ["$os_string"])

#
# Enable use of gold linker when building the Swift overlay
# to avoid a symbol relocation issue.
# Ultimately the request to use gold should be passed in as an arg
#
AC_CHECK_PROG(use_gold_linker, ld.gold, true, false)
AM_CONDITIONAL(USE_GOLD_LINKER, $use_gold_linker)

#
# Enable an extended test suite that includes
# tests that are too unreliable to be enabled by
# default in the Swift CI environment, but are still
# useful for libdispatch developers to be able to run.
#
AC_ARG_ENABLE([extended-test-suite],
  [AS_HELP_STRING([--enable-extended-test-suite],
    [Include additional test cases that may fail intermittently])]
)
AM_CONDITIONAL(EXTENDED_TEST_SUITE, test "x$enable_extended_test_suite" = "xyes")

#
# Enable __thread based TSD on platforms where it is efficient
# Allow override based on command line argument to configure
#
AC_ARG_ENABLE([thread-local-storage],
  [AS_HELP_STRING([--enable-thread-local-storage],
    [Enable usage of thread local storage via __thread])],,
  [case $target_os in
      linux*)
        enable_thread_local_storage=yes
	    ;;
      *)
        enable_thread_local_storage=no
   esac]
)
AS_IF([test "x$enable_thread_local_storage" = "xyes"],
  [AC_DEFINE(DISPATCH_USE_THREAD_LOCAL_STORAGE, 1,
    [Enable usage of thread local storage via __thread])]
)

AC_USE_SYSTEM_EXTENSIONS
AM_INIT_AUTOMAKE([foreign no-dependencies subdir-objects])
LT_INIT([disable-static])

AC_PROG_INSTALL
AC_PATH_PROGS(MIG, mig)
AC_PATH_PROG(DTRACE, dtrace)
AS_IF([test "x$DTRACE" != "x"], [use_dtrace=true],[
  use_dtrace=false
  CPPFLAGS="$CPPFLAGS -DDISPATCH_USE_DTRACE=0"
])
AM_CONDITIONAL(USE_DTRACE, $use_dtrace)
AC_PATH_PROG(LEAKS, leaks)
AS_IF([test "x$LEAKS" != "x"],
  [AC_DEFINE(HAVE_LEAKS, 1, [Define if Apple leaks program is present])
   have_leaks=true],
  [have_leaks=false]
)
AM_CONDITIONAL(HAVE_LEAKS, $have_leaks)

DISPATCH_C_ATOMIC_BUILTINS

case $dispatch_cv_atomic in
  yes) ;;
  -march*) MARCH_FLAGS="$dispatch_cv_atomic"
         AC_SUBST([MARCH_FLAGS]) ;;
  *) AC_MSG_ERROR([No gcc builtin atomic operations available]) ;;
esac

#
# Find libraries we will need
#
AC_SEARCH_LIBS(clock_gettime, rt)
AC_SEARCH_LIBS(pthread_create, pthread)

AC_CHECK_FUNCS([strlcpy getprogname], [],
  [PKG_CHECK_MODULES(BSD_OVERLAY, libbsd-overlay,[
    AC_DEFINE(HAVE_STRLCPY, 1, [])
    AC_DEFINE(HAVE_GETPROGNAME, 1, [])
  ])], [#include <string.h>]
)

#
# Checks for header files.
#
AC_HEADER_STDC
AC_CHECK_HEADERS([TargetConditionals.h pthread_np.h malloc/malloc.h libkern/OSCrossEndian.h libkern/OSAtomic.h sys/guarded.h fcntl.h])

# hack for pthread/private headers
AS_IF([test -n "$apple_libpthread_source_path" -a -n "$apple_xnu_source_osfmk_path"], [
  saveCPPFLAGS="$CPPFLAGS"
  CPPFLAGS="$CPPFLAGS -I."
  ln -fsh "$apple_libpthread_source_path"/private/tsd_private.h pthread_machdep.h
  ln -fsh "$apple_libpthread_source_path"/private pthread
  ln -fsh "$apple_xnu_source_osfmk_path" System
  mkdir -p mach && ln -fsh "$apple_xnu_source_osfmk_path"/mach/coalition.h mach
])
AC_CHECK_HEADERS([pthread_machdep.h pthread/qos.h])

# pthread_workqueues.
# We can either use libdispatch's internal_workqueue or pthread_workqueue.
# If not specifically configured, default to internal_workqueues on
# Linux and pthread_workqueue on all other platforms.
# On any platform, if pthread_workqueue is not available, fall back
# to using internal_workqueue.
AC_ARG_ENABLE([internal-libpwq],
  [AS_HELP_STRING([--enable-internal-libpwq],
    [Use libdispatch's own implementation of pthread workqueues.])],,
  [case $target_os in
      linux*)
        enable_internal_libpwq=yes
	    ;;
      *)
        enable_internal_libpwq=no
   esac]
)
AS_IF([test "x$enable_internal_libpwq" = "xyes"],
  [AC_DEFINE(DISPATCH_USE_INTERNAL_WORKQUEUE, 1, [Use libdispatch's own implementation of pthread workqueues])
   have_pthread_workqueues=false,
   dispatch_use_internal_workqueue=true],
  [AC_CHECK_HEADERS([pthread/workqueue_private.h pthread_workqueue.h],
     [AC_DEFINE(HAVE_PTHREAD_WORKQUEUES, 1, [Define if pthread work queues are present])
      have_pthread_workqueues=true,
	  dispatch_use_internal_workqueue=false],
     [have_pthread_workqueues=false,
	  dispatch_use_internal_workqueue=true]
  )]
)
AM_CONDITIONAL(DISPATCH_USE_INTERNAL_WORKQUEUE, $dispatch_use_internal_workqueue)
AM_CONDITIONAL(HAVE_PTHREAD_WORKQUEUES, $have_pthread_workqueues)

AC_CHECK_HEADERS([libproc_internal.h], [], [], [#include <mach/mach.h>])
AC_CHECK_FUNCS([pthread_workqueue_setdispatch_np _pthread_workqueue_init])
AS_IF([test -n "$apple_libpthread_source_path" -a -n "$apple_xnu_source_osfmk_path"], [
  rm -f pthread_machdep.h pthread System mach/coalition.h
  CPPFLAGS="$saveCPPFLAGS"
  AC_CONFIG_COMMANDS([src/pthread_machdep.h],
    [ln -fsh "$apple_libpthread_source_path"/private/tsd_private.h src/pthread_machdep.h],
    [apple_libpthread_source_path="$apple_libpthread_source_path"])
  AC_CONFIG_COMMANDS([src/pthread],
    [ln -fsh "$apple_libpthread_source_path"/private src/pthread],
    [apple_libpthread_source_path="$apple_libpthread_source_path"])
  AC_CONFIG_COMMANDS([src/System],
    [ln -fsh "$apple_xnu_source_osfmk_path" src/System],
    [apple_xnu_source_osfmk_path="$apple_xnu_source_osfmk_path"])
  AC_CONFIG_COMMANDS([src/mach/coalition.h],
    [ln -fsh "$apple_xnu_source_osfmk_path"/mach/coalition.h src/mach],
    [apple_xnu_source_osfmk_path="$apple_xnu_source_osfmk_path"])
])
# hack for xnu/bsd/sys/event.h EVFILT_SOCK declaration
AS_IF([test -n "$apple_xnu_source_bsd_path"], [
  CPPFLAGS="$CPPFLAGS -DPRIVATE=1"
])

#
# Check for CoreFoundation, Foundation and objc
#
AC_CHECK_HEADER([CoreFoundation/CoreFoundation.h],
  [have_corefoundation=true], [have_corefoundation=false]
)
AM_CONDITIONAL(HAVE_COREFOUNDATION, $have_corefoundation)

AC_LANG_PUSH([Objective C])
AC_CHECK_HEADER([Foundation/Foundation.h],
  [have_foundation=true], [have_foundation=false]
)
AM_CONDITIONAL(HAVE_FOUNDATION, $have_foundation)
AC_CHECK_HEADER([objc/NSObject.h], [
  AC_DEFINE(HAVE_OBJC, 1, [Define if you have the Objective-C runtime])
  have_objc=true], [have_objc=false]
)
AM_CONDITIONAL(USE_OBJC, $have_objc)
AC_LANG_POP([Objective C])

#
# We use the availability of mach.h to decide whether to compile in all sorts
# of Machisms, including using Mach ports as event sources, etc.
#
AC_CHECK_HEADER([mach/mach.h], [
  AC_DEFINE(HAVE_MACH, 1, [Define if mach is present])
  AC_DEFINE(__DARWIN_NON_CANCELABLE, 1, [Define if using Darwin $NOCANCEL])
  have_mach=true], [have_mach=false]
)
AM_CONDITIONAL(USE_MIG, $have_mach)
AC_CHECK_FUNCS([mach_port_construct])

#
# Find functions and declarations we care about.
#
AC_CHECK_DECLS([CLOCK_UPTIME, CLOCK_MONOTONIC, CLOCK_REALTIME, CLOCK_UPTIME_FAST], [], [],
  [[#include <time.h>]])
AC_CHECK_DECLS([NOTE_NONE, NOTE_REAP, NOTE_REVOKE, NOTE_SIGNAL, NOTE_LOWAT], [], [],
  [[#include <sys/event.h>]])
AC_CHECK_DECLS([FD_COPY], [], [], [[#include <sys/select.h>]])
AC_CHECK_DECLS([SIGEMT], [], [], [[#include <signal.h>]])
AC_CHECK_DECLS([VQ_UPDATE, VQ_VERYLOWDISK, VQ_QUOTA, VQ_NEARLOWDISK, VQ_DESIRED_DISK], [], [], [[#include <sys/mount.h>]])
AC_CHECK_DECLS([program_invocation_short_name], [], [], [[#include <errno.h>]])
AC_CHECK_FUNCS([pthread_key_init_np pthread_main_np mach_absolute_time mach_approximate_time malloc_create_zone sysconf])

AC_CHECK_DECLS([POSIX_SPAWN_START_SUSPENDED],
  [have_posix_spawn_start_suspended=true], [have_posix_spawn_start_suspended=false],
  [[#include <sys/spawn.h>]]
)
AM_CONDITIONAL(HAVE_POSIX_SPAWN_START_SUSPENDED, $have_posix_spawn_start_suspended)

AC_CHECK_FUNC([sem_init],
  [have_sem_init=true], [have_sem_init=false]
)

AC_CHECK_HEADER([linux/futex.h], [
  AC_DEFINE(HAVE_FUTEX, 1, [Define if linux/futex.h is present])
  have_futex=true], [have_futex=false]
)

#
# We support both Mach semaphores and POSIX semaphores; if the former are
# available, prefer them.
#
AC_MSG_CHECKING([what semaphore type to use]);
AS_IF([test "x$have_mach" = "xtrue"],
  [AC_DEFINE(USE_MACH_SEM, 1, [Define to use Mach semaphores])
    AC_MSG_RESULT([Mach semaphores])],
  [test "x$have_sem_init" = "xtrue"],
  [AC_DEFINE(USE_POSIX_SEM, 1, [Define to use POSIX semaphores])
    AC_MSG_RESULT([POSIX semaphores])],
  [AC_MSG_ERROR([no supported semaphore type])]
)

AC_CHECK_HEADERS([sys/cdefs.h], [], [],
  [#ifdef HAVE_SYS_CDEFS_H
   #include <sys/cdefs.h>
   #endif])

DISPATCH_C_BLOCKS

AC_CACHE_CHECK([for -fvisibility=hidden], [dispatch_cv_cc_visibility_hidden], [
  saveCFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS -fvisibility=hidden"
  AC_LINK_IFELSE([AC_LANG_PROGRAM([
    extern __attribute__ ((visibility ("default"))) int foo; int foo;], [foo = 0;])],
    [dispatch_cv_cc_visibility_hidden="yes"], [dispatch_cv_cc_visibility_hidden="no"])
  CFLAGS="$saveCFLAGS"
])
AS_IF([test "x$dispatch_cv_cc_visibility_hidden" != "xno"], [
    VISIBILITY_FLAGS="-fvisibility=hidden"
])
AC_SUBST([VISIBILITY_FLAGS])

AC_CACHE_CHECK([for -momit-leaf-frame-pointer], [dispatch_cv_cc_omit_leaf_fp], [
  saveCFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS -momit-leaf-frame-pointer"
  AC_LINK_IFELSE([AC_LANG_PROGRAM([
    extern int foo(void); int foo(void) {return 1;}], [foo();])],
    [dispatch_cv_cc_omit_leaf_fp="yes"], [dispatch_cv_cc_omit_leaf_fp="no"])
  CFLAGS="$saveCFLAGS"
])
AS_IF([test "x$dispatch_cv_cc_omit_leaf_fp" != "xno"], [
  OMIT_LEAF_FP_FLAGS="-momit-leaf-frame-pointer"
])
AC_SUBST([OMIT_LEAF_FP_FLAGS])

AS_IF([test "x$have_mach" = "xtrue"], [
  AC_CACHE_CHECK([for darwin linker], [dispatch_cv_ld_darwin], [
    saveLDFLAGS="$LDFLAGS"
    LDFLAGS="$LDFLAGS -dynamiclib -compatibility_version 1.2.3 -current_version 4.5.6 -dead_strip"
    AC_LINK_IFELSE([AC_LANG_PROGRAM([
      extern int foo; int foo;], [foo = 0;])],
      [dispatch_cv_ld_darwin="yes"], [dispatch_cv_ld_darwin="no"])
    LDFLAGS="$saveLDFLAGS"
  ])
])
AM_CONDITIONAL(HAVE_DARWIN_LD, [test "x$dispatch_cv_ld_darwin" == "xyes"])

#
# symlink platform-specific module.modulemap files
#
AS_CASE([$target_os],
  [darwin*], [ dispatch_module_map_os=darwin ],
  [ dispatch_module_map_os=generic ]
)
AC_CONFIG_COMMANDS([modulemaps], [
      ln -fs $dispatch_module_map_os/module.modulemap $ac_top_srcdir/dispatch/module.modulemap
      ln -fs $dispatch_module_map_os/module.modulemap $ac_top_srcdir/private/module.modulemap
  ],
  [dispatch_module_map_os="$dispatch_module_map_os"]
)

#
# Temporary: some versions of clang do not mark __builtin_trap() as
# __attribute__((__noreturn__)).  Detect and add if required.
#
AC_COMPILE_IFELSE(
  [AC_LANG_PROGRAM([void __attribute__((__noreturn__)) temp(void) { __builtin_trap(); }], [])],
  [AC_DEFINE(HAVE_NORETURN_BUILTIN_TRAP, 1, [Define if __builtin_trap marked noreturn])]
)

#
# Add option to avoid building tests
#
AC_ARG_ENABLE([build-tests],
  [AS_HELP_STRING([--disable-build-tests], [Disable tests compilation])])
AM_CONDITIONAL(BUILD_TESTS, [test "x$enable_build_tests" != "xno"])

#
# Generate Makefiles.
#
AC_CONFIG_FILES([Makefile dispatch/Makefile man/Makefile os/Makefile private/Makefile src/Makefile tests/Makefile])

#
# Generate testsuite links
#
AC_CONFIG_LINKS([tests/dispatch:$ac_top_srcdir/private tests/leaks-wrapper:tests/leaks-wrapper.sh])

AC_OUTPUT