project('libfuse3', ['c'],
  version: '3.17.4',
  meson_version: '>= 0.60.0',
  default_options: [
    'buildtype=debugoptimized',
    'c_std=gnu11',
    'cpp_std=c++17',
    'warning_level=2',
  ],
)

# --- Versionsaufbereitung (wie bisher) ---
version_parts = meson.project_version().split('-')
base_version = version_parts[0]
version_list = base_version.split('.')
FUSE_MAJOR_VERSION = version_list[0]
FUSE_MINOR_VERSION = version_list[1]
FUSE_HOTFIX_VERSION = version_list[2]
FUSE_RC_VERSION = version_parts.length() > 1 ? version_parts[1] : ''

platform = host_machine.system()
if platform == 'darwin'
  error('libfuse does not support OS-X.\n' +
        'See http://osxfuse.github.io/ or https://www.fuse-t.org/')
elif platform == 'cygwin' or platform == 'windows'
  error('libfuse does not support Windows.\n' +
        'See http://www.secfs.net/winfsp/')
endif

cc = meson.get_compiler('c')

# --- Öffentliche Konfiguration, wird installiert (libfuse_config.h) ---
public_cfg = configuration_data()
public_cfg.set('FUSE_MAJOR_VERSION', FUSE_MAJOR_VERSION)
public_cfg.set('FUSE_MINOR_VERSION', FUSE_MINOR_VERSION)
public_cfg.set('FUSE_HOTFIX_VERSION', FUSE_HOTFIX_VERSION)
public_cfg.set('FUSE_RC_VERSION', FUSE_RC_VERSION)

# --- Private Konfiguration, nur beim Bauen (fuse_config.h) ---
private_cfg = configuration_data()
private_cfg.set_quoted('PACKAGE_VERSION', meson.project_version())

# Default-Includes/Args für Funktions-/Struct-Checks
include_default = '''
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pthread.h>
'''
args_default = ['-D_GNU_SOURCE']

# Funktionschecks
foreach func : [
  'fork','fstatat','openat','readlinkat','pipe2','splice','vmsplice',
  'posix_fallocate','fdatasync','utimensat','copy_file_range','fallocate'
]
  private_cfg.set('HAVE_' + func.to_upper(),
    cc.has_function(func, prefix: include_default, args: args_default)
  )
endforeach

# Spezialfälle, die gelinkt werden müssen
special_funcs = {
  'pthread_setname_np' : '''
    #include <pthread.h>
    int main(void) {
      pthread_t t = pthread_self();
      pthread_setname_np(t, "test");
      return 0;
    }''',
  'close_range' : '''
    #include <unistd.h>
    #include <fcntl.h>
    #include <linux/close_range.h>
    int main(void){
      unsigned int flags = CLOSE_RANGE_UNSHARE;
      return close_range(3, ~0U, flags);
    }'''
}
foreach name, code : special_funcs
  private_cfg.set('HAVE_' + name.to_upper(),
    cc.links(code, args: args_default, name: name + ' check')
  )
endforeach

# Weitere Checks
private_cfg.set('HAVE_SETXATTR', cc.has_function('setxattr', prefix: '#include <sys/xattr.h>'))
private_cfg.set('HAVE_ICONV', cc.has_function('iconv', prefix: '#include <iconv.h>'))
private_cfg.set('HAVE_BACKTRACE', cc.has_function('backtrace', prefix: '#include <execinfo.h>'))

# Struct-Member
private_cfg.set('HAVE_STRUCT_STAT_ST_ATIM',
  cc.has_member('struct stat', 'st_atim',
    prefix: include_default + '#include <sys/stat.h>',
    args: args_default
  )
)
private_cfg.set('HAVE_STRUCT_STAT_ST_ATIMESPEC',
  cc.has_member('struct stat', 'st_atimespec',
    prefix: include_default + '#include <sys/stat.h>',
    args: args_default
  )
)

# --- Compiler-/Projektflags ---
add_project_arguments(
  [
    '-D_REENTRANT',
    '-DHAVE_LIBFUSE_PRIVATE_CONFIG_H',
    '-Wno-sign-compare',
    '-D_FILE_OFFSET_BITS=64',
    '-Wstrict-prototypes',
    '-Wmissing-declarations',
    '-Wwrite-strings',
    '-fno-strict-aliasing',
  ],
  language: 'c'
)
add_project_arguments(
  [
    '-D_REENTRANT',
    '-DHAVE_LIBFUSE_PRIVATE_CONFIG_H',
    '-D_GNU_SOURCE',
    '-D_FILE_OFFSET_BITS=64',
    '-Wno-sign-compare',
    '-Wmissing-declarations',
    '-Wwrite-strings',
    '-fno-strict-aliasing',
  ],
  language: 'cpp'
)

# Warnung "unused result" ggf. neutralisieren (wie bisher)
code_unused_result = '''
__attribute__((warn_unused_result)) int get_4() { return 4; }
int main(void) { (void)get_4(); return 0; }
'''
if not cc.compiles(code_unused_result, args: ['-O0','-Werror=unused-result'])
  message('Compiler warns about unused result even when casting to void')
  add_project_arguments('-Wno-unused-result', language: 'c')
endif

# --- Versionierte Symbole (wie bisher) ---
versioned_symbols = 1
code_libc = '''
int main(void) {
#if (defined(__UCLIBC__) || defined(__APPLE__))
#error
#endif
  return 0;
}'''
if not cc.compiles(code_libc, args: ['-O0'])
  versioned_symbols = 0
endif
if get_option('disable-libc-symbol-version')
  versioned_symbols = 0
endif
if versioned_symbols == 1
  message('Enabling versioned libc symbols')
  public_cfg.set('LIBFUSE_BUILT_WITH_VERSIONED_SYMBOLS', 1)

  code_symver = '''
  __attribute__ ((symver("test@TEST"))) void foo(void) {}
  int main(void){ return 0; }
  '''
  if cc.compiles(code_symver, args: ['-O0','-c','-Werror'])
    message('Compiler supports symver attribute')
    add_project_arguments('-DHAVE_SYMVER_ATTRIBUTE', language: 'c')
  else
    message('Compiler does not support symver attribute')
  endif
else
  message('Disabling versioned libc symbols')
endif

# --- Workaround für bestimmte musl-Varianten (unverändert) ---
detect_getmntent_needs_unescape = '''
#define _GNU_SOURCE
#include <mntent.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define dir_space_tab "dir\\040space\\011tab"
int main() {
  const char *fake_mtab = "name " dir_space_tab " type opts 0 0\\n";
  FILE *f = fmemopen((void *)fake_mtab, strlen(fake_mtab)+1, "r");
  struct mntent *entp = getmntent(f);
  fclose(f);
  if (!entp) return 1;
  if (strcmp(entp->mnt_dir, dir_space_tab)==0)
    printf("needs escaping\\n");
  else
    printf("no need to escape\\n");
}
'''
if not meson.is_cross_build()
  r = cc.run(detect_getmntent_needs_unescape)
  if r.compiled() and r.returncode() == 0 and r.stdout().strip() == 'needs escaping'
    message('getmntent does not unescape')
    add_project_arguments('-DGETMNTENT_NEEDS_UNESCAPING', language: 'c')
  endif
endif

# --- Header mit Ergebnissen erzeugen ---
configure_file(output: 'fuse_config.h', configuration: private_cfg)
configure_file(
  output: 'libfuse_config.h',
  configuration: public_cfg,
  install: true,
  install_dir: join_paths(get_option('includedir'), 'fuse3'),
)

# Includes (Builddir enthält fuse_config.h)
include_dirs = include_directories('include', 'lib', '.')

# --- Gemeinsame Dependencies ---
# Threads (niemals -lpthread in öffentliche Libs packen!)
thread_dep = dependency('threads')

# dl: auf Android unnötig (bionic liefert das intern),
# auf anderen Linuxen weiter verfügbar halten.
dl_dep = cc.find_library('dl', required: platform != 'android')

# Für Android (und generell) lieber das Flag -pthread setzen,
# statt -lpthread zu verlinken.
add_project_link_arguments('-pthread', language: 'c')

# Diese Variable wird in lib/meson.build beim pkgconfig.generate()
# als libraries_private: verwendet, damit -lpthread/-ldl NICHT in Libs: landen.
fuse_pc_libs_private = []
if thread_dep.found()
  fuse_pc_libs_private += thread_dep
endif
if dl_dep.found()
  fuse_pc_libs_private += dl_dep
endif

# --- Unterverzeichnisse bauen ---
subdirs = ['lib', 'include']
if get_option('utils') and not platform.endswith('bsd') and platform != 'dragonfly'
  subdirs += ['util', 'doc']
endif
if get_option('examples')
  subdirs += 'example'
endif
if get_option('tests')
  subdirs += 'test'
endif
foreach n : subdirs
  subdir(n)
endforeach