#
# configure.ac
#
# Process this file with autoconf to produce a configure script.
AC_COPYRIGHT([
 This file is part of libunwind.

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in all
 copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
])


define(pkg_major, 1)
define(pkg_minor, 9)
define(pkg_extra, -pre)
define(pkg_maintainer, https://github.com/libunwind/libunwind)
define(mkvers, $1.$2$3)
AC_INIT([libunwind],[mkvers(pkg_major, pkg_minor, pkg_extra)],[pkg_maintainer])
AC_CONFIG_SRCDIR(src/mi/backtrace.c)
AC_CONFIG_AUX_DIR(config)
AC_CONFIG_MACRO_DIRS([m4])
AC_CANONICAL_TARGET
AM_INIT_AUTOMAKE([1.7 subdir-objects -Wall])
AM_SILENT_RULES([yes])
AM_MAINTAINER_MODE
AC_CONFIG_HEADERS([include/config.h])

dnl Checks for programs.
AC_PROG_CC
AC_PROG_CXX
AC_PROG_INSTALL
AC_PROG_MAKE_SET
m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
LT_INIT
AM_PROG_AS
AM_PROG_CC_C_O

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_C_INLINE
AC_TYPE_SIZE_T
AC_CHECK_SIZEOF(off_t)

dnl Checks for header files.
AC_MSG_NOTICE([--- Checking for header files ---])
AC_CHECK_HEADERS(asm/ptrace_offsets.h asm/ptrace.h asm/vsyscall.h endian.h sys/endian.h \
		sys/param.h execinfo.h ia64intrin.h sys/uc_access.h unistd.h signal.h \
		sys/types.h sys/procfs.h sys/ptrace.h sys/syscall.h byteswap.h elf.h \
		sys/elf.h link.h sys/link.h)

CPPFLAGS="${CPPFLAGS} -D_GNU_SOURCE"

AC_MSG_NOTICE([--- Checking for available types ---])
AC_CHECK_MEMBERS([struct dl_phdr_info.dlpi_subs],,,[#include <link.h>])
AC_CHECK_TYPES([struct elf_prstatus, struct prstatus, procfs_status, elf_fpregset_t], [], [],
[$ac_includes_default
#if HAVE_SYS_PROCFS_H
# include <sys/procfs.h>
#endif
])

dnl Checks for libraries.
AC_MSG_NOTICE([--- Checking for libraries ---])
save_LDFLAGS="$LDFLAGS"
save_LIBS="$LIBS"
LDFLAGS="${LDFLAGS} -nostdlib"
AC_SEARCH_LIBS([_Unwind_Resume], [gcc_s gcc],
               [AS_IF([test "$ac_cv_search__Unwind_Resume" != "none required"],
                      [AC_SUBST([LIBCRTS], ["$ac_cv_search__Unwind_Resume"])])],
               [],
               [-lc]
)
LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
AC_SEARCH_LIBS([__uc_get_grs], [uca])
AC_SEARCH_LIBS([getcontext], [ucontext])

dnl Checks for library functions.
AC_CHECK_FUNCS(dl_iterate_phdr dl_phdr_removals_counter dlmodinfo getunwind \
		ttrace mincore pipe2 sigaltstack execvpe)

AC_MSG_CHECKING([if building with AltiVec])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#ifndef __ALTIVEC__
# error choke
#endif
]])], [use_altivec=yes],[use_altivec=no])
AM_CONDITIONAL(USE_ALTIVEC, [test x$use_altivec = xyes])
AC_MSG_RESULT([$use_altivec])

AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#ifndef __powerpc64__
# error choke
#endif
]])], [ppc_bits=64], [ppc_bits=32])

AC_DEFUN([SET_ARCH],[
    AS_CASE([$1],
        [aarch64*],[$2=aarch64],
        [arm*],[$2=arm],
        [i?86],[$2=x86],
        [hppa*],[$2=hppa],
        [mips*],[$2=mips],
        [powerpc*],[$2=ppc$ppc_bits],
        [sh*],[$2=sh],
        [amd64],[$2=x86_64],
        [riscv*],[$2=riscv],
        [loongarch64*],[$2=loongarch64],
        [$2=$1])
]) dnl SET_ARCH

SET_ARCH([$build_cpu],[build_arch])
SET_ARCH([$host_cpu],[host_arch])
SET_ARCH([$target_cpu],[target_arch])

AC_MSG_CHECKING([if libunwind-coredump should be built])
AC_ARG_ENABLE([coredump],
              [AS_HELP_STRING([--enable-coredump],
                              [build libunwind-coredump library
                               @<:@default=autodetect@:>@])],
              [],
              [enable_coredump="check"]
)
AS_IF([test "$enable_coredump" = "check"],
      [AS_CASE([$host_arch],
               [aarch64*|arm*|mips*|sh*|x86*|riscv*|loongarch64], [enable_coredump=yes],
               [enable_coredump=no])]
)
AC_MSG_RESULT([$enable_coredump])
AM_CONDITIONAL(BUILD_COREDUMP, test x$enable_coredump = xyes)

AC_MSG_CHECKING([if libunwind-ptrace should be built])
AC_ARG_ENABLE([ptrace],
              [AS_HELP_STRING([--enable-ptrace],
                              [build libunwind-ptrace library
                               @<:@default=autodetect@:>@])],
              [],
              [enable_ptrace="check"]
)
AS_IF([test "$enable_ptrace" != "no"],
      [AS_IF([test "$ac_cv_header_sys_ptrace_h" = "yes"], [enable_ptrace=yes],
             [test "$enable_ptrace" != "check"], [AC_MSG_FAILURE([--enable-ptrace given but
                                                                  ptrace not supported on target])],
             [enable_ptrace="no"]
      )]
)
AC_MSG_RESULT([$enable_ptrace])
AM_CONDITIONAL([BUILD_PTRACE], [test x$enable_ptrace = xyes])
AM_COND_IF([BUILD_PTRACE], [
  AC_MSG_NOTICE([--- Checking for ptrace symbols ---])
  AC_CHECK_DECLS([PTRACE_POKEUSER, PTRACE_POKEDATA, PTRACE_SETREGSET,
                  PTRACE_TRACEME, PTRACE_CONT, PTRACE_SINGLESTEP,
                  PTRACE_SYSCALL, PT_IO, PT_GETREGS,
                  PT_GETFPREGS, PT_CONTINUE, PT_TRACE_ME,
                  PT_STEP, PT_SYSCALL],
                 [],
                 [],
                 [$ac_includes_default
                  #if HAVE_SYS_TYPES_H
                  #include <sys/types.h>
                  #endif
                  #include <sys/ptrace.h>
                 ])
])

AC_MSG_CHECKING([if libunwind-nto should be built])
AC_ARG_ENABLE(nto,
              [AS_HELP_STRING([--enable-nto],
                              [build libunwind-nto library
                               @<:@default=autodetect@:>@])],
              [],
              [enable_nto="check"]
)
AS_IF([test "$enable_nto" != "no"],
      [AC_CHECK_HEADER([sys/neutrino.h], [enable_nto=yes], [enable_nto=no])]
)
AC_MSG_RESULT([$enable_nto])
AM_CONDITIONAL([BUILD_NTO], [test x$enable_nto = xyes])

AC_MSG_CHECKING([if libunwind-setjmp should be built])
AC_ARG_ENABLE([setjmp],
              [AS_HELP_STRING([--enable-setjmp],
                              [build libunwind-setjmp library
                               @<:@default=autodetect@:>@])],
              [],
              [enable_setjmp=check]
)
AS_IF([test "$enable_setjmp" = check],
      [AS_IF([test x$target_arch = x$host_arch],
             [enable_setjmp=yes],
             [enable_setjmp=no])]
      [AS_IF([expr x$target_os : xnto-qnx >/dev/null],
             [enable_setjmp=no])]
)
AC_MSG_RESULT([$enable_setjmp])
AM_CONDITIONAL(BUILD_SETJMP, test x$enable_setjmp = xyes)

AC_MSG_CHECKING([if weak-backtrace is enabled])
AC_ARG_ENABLE([weak-backtrace],
              [AS_HELP_STRING([--disable-weak-backtrace],
                              [do not provide the weak 'backtrace' symbol
                               @<:@default=no@:>@])],
              [],
              [enable_weak_backtrace=yes]
)
AC_MSG_RESULT([$enable_weak_backtrace])
AM_CONDITIONAL([CONFIG_WEAK_BACKTRACE], [test "x$enable_weak_backtrace" = xyes])
AM_COND_IF([CONFIG_WEAK_BACKTRACE], [
  AC_DEFINE([CONFIG_WEAK_BACKTRACE], [1], [Define if the weak 'backtrace' symbol is provided.])
])


AC_MSG_CHECKING([if unwind.h should be exported])
AC_ARG_ENABLE([unwind-header],
              [AS_HELP_STRING([--disable-unwind-header],
                              [do not export the 'unwind.h' header
                               @<:@default=no@:>@])],
              [],
              [enable_unwind_header=yes]
)
AC_MSG_RESULT([$enable_unwind_header])
AM_CONDITIONAL(BUILD_UNWIND_HEADER, test "x$enable_unwind_header" = xyes)

AC_MSG_CHECKING([whether to support UNW_CACHE_PER_THREAD])
AC_ARG_ENABLE([per-thread-cache],
              [AS_HELP_STRING([--enable-per-thread-cache],
                              [build with support for UNW_CACHE_PER_THREAD
                               (which imposes a high TLS memory usage)
                               @<:@default=no@:>@])],
              [],
              [enable_per_thread_cache=no]
)
AC_MSG_RESULT([$enable_per_thread_cache])
AS_IF([test x$enable_per_thread_cache = xyes],
      [AC_DEFINE([HAVE___CACHE_PER_THREAD], 1, [Define to 1 if --enable-per-thread-cache])]
)

AC_MSG_CHECKING([if testsuite should be built])
AC_ARG_ENABLE([tests],
              [AS_HELP_STRING([--disable-tests],
                              [disable building tests @<:@default=no@:>@])],
              [],
              [enable_tests=yes]
)
AC_MSG_RESULT([$enable_tests])
AM_CONDITIONAL([CONFIG_TESTS], [test x$enable_tests = xyes])
AM_COND_IF([CONFIG_TESTS], [
  old_LIBS="$LIBS"
  AC_MSG_NOTICE([--- Checking for extra libraries linked to tests ---])
  AC_SEARCH_LIBS([dlopen], [dl],
                 [AS_IF([test "$ac_cv_search_dlopen" != "none required"],
                        [AC_SUBST([DLLIB], ["$ac_cv_search_dlopen"])])])
  AC_SEARCH_LIBS([pthread_create], [pthread],
                 [AS_IF([test "$ac_cv_search_pthread_create" != "none required"],
                        [AC_SUBST([PTHREADS_LIB],["$ac_cv_search_pthread_create"])])])
  AC_SEARCH_LIBS([backtrace], [execinfo],
                 [AS_IF([test "$ac_cv_search_backtrace" != "none required"],
                        [AC_SUBST([BACKTRACELIB],["$ac_cv_search_backtrace"])])])
  LIBS="$old_LIBS"
  AC_CONFIG_FILES([tests/Makefile])
  AC_CONFIG_FILES([tests/check-namespace.sh], [chmod +x tests/check-namespace.sh])
])
AC_ARG_WITH([testdriver],
            [AS_HELP_STRING([--with-testdriver],
                            [use designated test driver instead of default LOG_DRIVER])],
                            [],
                            [with_testdriver=\$\(top_srcdir\)/config/test-driver])
AC_SUBST([UNW_TESTDRIVER], $with_testdriver)


AC_MSG_CHECKING([if debug support should be built])
AC_ARG_ENABLE([debug],
              [AS_HELP_STRING([--enable-debug],
                              [enable debug support (slows down execution)
                               @<:@default=no@:>@])],
              [],
              [enable_debug=no]
)
AC_MSG_RESULT([$enable_debug])
AS_IF([test x$enable_debug = xyes],
      [CPPFLAGS="${CPPFLAGS} -DDEBUG"],
      [CPPFLAGS="${CPPFLAGS} -DNDEBUG"]
)

AC_MSG_CHECKING([if C++ exception support should be built])
AC_ARG_ENABLE([cxx_exceptions],
              [AS_HELP_STRING([--enable-cxx-exceptions],
                              [use libunwind to handle C++ exceptions
                               @<:@default=autodetect@:>@])],
              [],
              [enable_cxx_exceptions=check]
)
AS_IF([test $enable_cxx_exceptions = check],
      [AS_CASE([$target_arch],
               [aarch64*|arm*|mips*|x86*|s390x*|loongarch64], [enable_cxx_exceptions=no],
               [enable_cxx_exceptions=yes])]
)
AC_MSG_RESULT([$enable_cxx_exceptions])
AM_CONDITIONAL([SUPPORT_CXX_EXCEPTIONS], [test x$enable_cxx_exceptions = xyes])

AC_MSG_CHECKING([if documentation should be built])
AC_ARG_ENABLE([documentation],
	          [AS_HELP_STRING([--enable-documentation],
	                          [enable generating the man pages @<:@default=yes@:>@])],
	          [],
	          [enable_documentation=yes])
AC_MSG_RESULT([$enable_documentation])
AC_PATH_PROG([LATEX2MAN],[latex2man])
AS_IF([test "x$LATEX2MAN" = "x" && test "x$enable_documentation" != "xno"], [
  AC_MSG_WARN([latex2man not found. Install latex2man. Disabling docs.])
  enable_documentation="no";
])
AM_CONDITIONAL([CONFIG_DOCS], [test x$enable_documentation != xno])
AM_COND_IF([CONFIG_DOCS], [AC_CONFIG_FILES([doc/Makefile doc/common.tex])])

# Enable tests built around unw_resume, which is not supported on all targets
AC_MSG_CHECKING([if we should enable unw_resume tests])
AS_CASE([$target_os],
        [nto-qnx*], [enable_unw_resume_tests=no],
        [enable_unw_resume_tests=yes])
AC_MSG_RESULT([$enable_unw_resume_tests])
AM_CONDITIONAL([ENABLE_UNW_RESUME_TESTS], [test x$enable_unw_resume_tests = xyes])

AC_MSG_CHECKING([for build architecture])
AC_MSG_RESULT([$build_arch])
AC_MSG_CHECKING([for host architecture])
AC_MSG_RESULT([$host_arch])
AC_MSG_CHECKING([for target architecture])
AC_MSG_RESULT([$target_arch])
AC_MSG_CHECKING([for target operating system])
AC_MSG_RESULT([$target_os])

AM_CONDITIONAL([XFAIL_PTRACE_TEST], [echo $CFLAGS | grep -q '\-m32\>'])
AM_CONDITIONAL([CROSS_BUILD], [test x$build_arch != x$host_arch])
AM_CONDITIONAL(REMOTE_ONLY, test x$target_arch != x$host_arch)
AM_CONDITIONAL(ARCH_AARCH64, test x$target_arch = xaarch64)
AM_CONDITIONAL(ARCH_ARM, test x$target_arch = xarm)
AM_CONDITIONAL(ARCH_IA64, test x$target_arch = xia64)
AM_CONDITIONAL(ARCH_HPPA, test x$target_arch = xhppa)
AM_CONDITIONAL(ARCH_MIPS, test x$target_arch = xmips)
AM_CONDITIONAL(ARCH_X86, test x$target_arch = xx86)
AM_CONDITIONAL(ARCH_X86_64, test x$target_arch = xx86_64)
AM_CONDITIONAL(ARCH_PPC32, test x$target_arch = xppc32)
AM_CONDITIONAL(ARCH_PPC64, test x$target_arch = xppc64)
AM_CONDITIONAL(ARCH_SH, test x$target_arch = xsh)
AM_CONDITIONAL(ARCH_S390X, test x$target_arch = xs390x)
AM_CONDITIONAL(ARCH_RISCV, test x$target_arch = xriscv)
AM_CONDITIONAL(ARCH_LOONGARCH64, test x$target_arch = xloongarch64)
AM_CONDITIONAL(OS_LINUX, expr x$target_os : xlinux >/dev/null)
AM_CONDITIONAL(OS_HPUX, expr x$target_os : xhpux >/dev/null)
AM_CONDITIONAL(OS_FREEBSD, expr x$target_os : xfreebsd >/dev/null)
AM_CONDITIONAL(OS_QNX, expr x$target_os : xnto-qnx >/dev/null)
AM_CONDITIONAL(OS_SOLARIS, expr x$target_os : xsolaris >/dev/null)

AC_MSG_CHECKING([for ELF helper width])
AS_CASE([${target_arch}],
        [arm|hppa|ppc32|x86|sh],           [use_elf32=yes; AC_MSG_RESULT([32])],
        [aarch64|ia64|ppc64|x86_64|s390x], [use_elf64=yes; AC_MSG_RESULT([64])],
        [mips|riscv|loongarch64],          [use_elfxx=yes; AC_MSG_RESULT([xx])],
        [AC_MSG_ERROR([Unknown ELF target: ${target_arch}])]
)
AM_CONDITIONAL(USE_ELF32, [test x$use_elf32 = xyes])
AM_CONDITIONAL(USE_ELF64, [test x$use_elf64 = xyes])
AM_CONDITIONAL(USE_ELFXX, [test x$use_elfxx = xyes])

AC_MSG_CHECKING([whether to include DWARF support])
if test x$target_arch != xia64; then
  use_dwarf=yes
else
  use_dwarf=no
fi
AM_CONDITIONAL(USE_DWARF, [test x$use_dwarf = xyes])
AC_MSG_RESULT([$use_dwarf])

AC_MSG_CHECKING([whether to restrict build to remote support])
if test x$target_arch != x$host_arch; then
  CPPFLAGS="${CPPFLAGS} -DUNW_REMOTE_ONLY"
  remote_only=yes
else
  remote_only=no
fi
AC_MSG_RESULT([$remote_only])

AC_MSG_CHECKING([whether to load .debug_frame sections])
AC_ARG_ENABLE(debug_frame,
AS_HELP_STRING([--enable-debug-frame],[Load the ".debug_frame" section if available]),, [
case "${target_arch}" in
  (arm) enable_debug_frame=yes;;
  (aarch64) enable_debug_frame=yes;;
  (*)   enable_debug_frame=no;;
esac])
if test x$remote_only = xyes; then
  enable_debug_frame=no
fi
if test x$enable_debug_frame = xyes; then
  AC_DEFINE([CONFIG_DEBUG_FRAME], [], [Enable Debug Frame])
fi
AC_MSG_RESULT([$enable_debug_frame])

AC_MSG_CHECKING([whether to block signals during mutex ops])
AC_ARG_ENABLE(block_signals,
AS_HELP_STRING([--enable-block-signals],[Block signals before performing mutex operations]),,
[enable_block_signals=yes])
if test x$enable_block_signals = xyes; then
  AC_DEFINE([CONFIG_BLOCK_SIGNALS], [], [Block signals before mutex operations])
fi
AC_MSG_RESULT([$enable_block_signals])

AC_MSG_CHECKING([whether to validate memory addresses before use])
AC_ARG_ENABLE(conservative_checks,
AS_HELP_STRING([--enable-conservative-checks],[Validate all memory addresses before use]),,
[enable_conservative_checks=yes])
if test x$enable_conservative_checks = xyes; then
  AC_DEFINE(CONSERVATIVE_CHECKS, 1,
	[Define to 1 if you want every memory access validated])
fi
AC_MSG_RESULT([$enable_conservative_checks])

AC_MSG_CHECKING([whether to enable msabi support])
AC_ARG_ENABLE(msabi_support,
AS_HELP_STRING([--enable-msabi-support],[Enables support for Microsoft ABI extensions]))
if test x$enable_msabi_support = xyes; then
  AC_DEFINE([CONFIG_MSABI_SUPPORT], [], [Support for Microsoft ABI extensions])
fi
AC_MSG_RESULT([$enable_msabi_support])

LIBLZMA=
AC_MSG_CHECKING([whether to support LZMA-compressed symbol tables])
AC_ARG_ENABLE(minidebuginfo,
AS_HELP_STRING([--enable-minidebuginfo], [Enables support for LZMA-compressed symbol tables]),, [enable_minidebuginfo=auto])
AC_MSG_RESULT([$enable_minidebuginfo])
if test x$enable_minidebuginfo != xno; then
   AC_CHECK_LIB([lzma], [lzma_mf_is_supported],
   [LIBLZMA=-llzma
    AC_DEFINE([HAVE_LZMA], [1], [Define if you have liblzma])
    enable_minidebuginfo=yes],
   [if test x$enable_minidebuginfo = xyes; then
      AC_MSG_FAILURE([liblzma not found])
    fi])
fi
AC_SUBST([LIBLZMA])
AM_CONDITIONAL(HAVE_LZMA, test x$enable_minidebuginfo = xyes)

LIBZ=
AC_MSG_CHECKING([whether to support ZLIB-compressed symbol tables])
AC_ARG_ENABLE(zlibdebuginfo,
AS_HELP_STRING([--enable-zlibdebuginfo], [Enables support for ZLIB-compressed symbol tables]),, [enable_zlibdebuginfo=auto])
AC_MSG_RESULT([$enable_zlibdebuginfo])
if test x$enable_zlibdebuginfo != xno; then
   AC_CHECK_LIB([z], [uncompress],
   [LIBZ=-lz
    AC_DEFINE([HAVE_ZLIB], [1], [Define if you have libz])
    enable_zlibdebuginfo=yes],
   [if test x$enable_zlibdebuginfo = xyes; then
      AC_MSG_FAILURE([libz not found])
    fi])
fi
AC_SUBST([LIBZ])
AM_CONDITIONAL(HAVE_ZLIB, test x$enable_zlibdebuginfo = xyes)

AC_MSG_CHECKING([for Intel compiler])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[#ifndef __INTEL_COMPILER
#error choke me
#endif]])],[intel_compiler=yes],[intel_compiler=no])

if test x$GCC = xyes -a x$intel_compiler != xyes; then
  CFLAGS="${CFLAGS} -fexceptions -Wall -Wsign-compare"
fi
AC_MSG_RESULT([$intel_compiler])

AC_MSG_CHECKING([if building on Solaris then define __EXTENSIONS__ macro])
if $OS_SOLARIS; then
  CFLAGS="${CFLAGS} -D__EXTENSIONS__"
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
fi

AC_MSG_CHECKING([for QCC compiler])
AS_CASE([$CC], [qcc*|QCC*], [qcc_compiler=yes], [qcc_compiler=no])
AC_MSG_RESULT([$qcc_compiler])

if test x$intel_compiler = xyes; then
  AC_MSG_CHECKING([if linker supports -static-libcxa])
  save_LDFLAGS="$LDFLAGS"
  LDFLAGS="$LDFLAGS -static-libcxa"
  AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],[have_static_libcxa=yes],[have_static_libcxa=no])
  LDFLAGS="$save_LDFLAGS"
  if test "x$have_static_libcxa" = xyes; then
    LDFLAGS_STATIC_LIBCXA="-XCClinker -static-libcxa"
  fi
  AC_MSG_RESULT([$have_static_libcxa])
fi

if test x$qcc_compiler = xyes; then
    LDFLAGS_NOSTARTFILES="-XCClinker -Wc,-nostartfiles"
else
    LDFLAGS_NOSTARTFILES="-XCClinker -nostartfiles"
fi

OLD_CFLAGS="${CFLAGS}"
CFLAGS="${CFLAGS} -march=armv8-a+sve"
AC_MSG_CHECKING([if compiler supports -march=armv8-a+sve])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], [supports_march_armv8_a_sve=yes],[supports_march_armv8_a_sve=no])
AM_CONDITIONAL(COMPILER_SUPPORTS_MARCH_ARMV8_A_SVE, [test x$supports_march_armv8_a_sve = xyes])
AC_MSG_RESULT([$supports_march_armv8_a_sve])
CFLAGS="${OLD_CFLAGS}"

AC_MSG_CHECKING([for __builtin___clear_cache])
AC_LINK_IFELSE(
  [AC_LANG_PROGRAM([[]], [[__builtin___clear_cache(0, 0)]])],
  [have__builtin___clear_cache=yes],
  [have__builtin___clear_cache=no])
if test x$have__builtin___clear_cache = xyes; then
  AC_DEFINE([HAVE__BUILTIN___CLEAR_CACHE], [1],
            [Defined if __builtin___clear_cache() is available])
fi
AC_MSG_RESULT([$have__builtin___clear_cache])

AC_MSG_CHECKING([for __builtin_unreachable])
AC_LINK_IFELSE(
  [AC_LANG_PROGRAM([[]], [[__builtin_unreachable()]])],
  [have__builtin_unreachable=yes],
  [have__builtin_unreachable=no])
if test x$have__builtin_unreachable = xyes; then
  AC_DEFINE([HAVE__BUILTIN_UNREACHABLE], [1],
            [Defined if __builtin_unreachable() is available])
fi
AC_MSG_RESULT([$have__builtin_unreachable])

CCASFLAGS="${CCASFLAGS} ${CPPFLAGS}"

arch="$target_arch"
ARCH=`echo $target_arch | tr [a-z] [A-Z]`

dnl create shell variables from the M4 macros:
PKG_MAJOR=pkg_major
PKG_MINOR=pkg_minor
PKG_EXTRA=pkg_extra
PKG_MAINTAINER=pkg_maintainer


AC_SUBST(build_arch)
AC_SUBST(target_os)
AC_SUBST(arch)
AC_SUBST(ARCH)
AC_SUBST(LDFLAGS_STATIC_LIBCXA)
AC_SUBST(LDFLAGS_NOSTARTFILES)
AC_SUBST(PKG_MAJOR)
AC_SUBST(PKG_MINOR)
AC_SUBST(PKG_EXTRA)
AC_SUBST(PKG_MAINTAINER)
AC_SUBST(enable_cxx_exceptions)
AC_SUBST(enable_debug_frame)


AC_CONFIG_FILES(Makefile src/Makefile
                include/libunwind-common.h
                include/libunwind.h include/tdep/libunwind_i.h)
AC_CONFIG_FILES(src/unwind/libunwind.pc src/coredump/libunwind-coredump.pc
                src/ptrace/libunwind-ptrace.pc src/setjmp/libunwind-setjmp.pc
                src/libunwind-generic.pc)
AC_OUTPUT