pkg-config/main.c

/*
 * Copyright (C) 2001, 2002 Red Hat Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "pkg.h"
#include "parse.h"

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>

#ifdef G_OS_WIN32
#define STRICT
#include <windows.h>
#undef STRICT
#endif

char *pcsysrootdir = NULL;
char *pkg_config_pc_path = NULL;

static gboolean want_my_version = FALSE;
static gboolean want_version = FALSE;
static FlagType pkg_flags = 0;
static gboolean want_list = FALSE;
static gboolean want_static_lib_list = ENABLE_INDIRECT_DEPS;
static gboolean want_short_errors = FALSE;
static gboolean want_uninstalled = FALSE;
static char *variable_name = NULL;
static gboolean want_exists = FALSE;
static gboolean want_provides = FALSE;
static gboolean want_requires = FALSE;
static gboolean want_requires_private = FALSE;
static char *required_atleast_version = NULL;
static char *required_exact_version = NULL;
static char *required_max_version = NULL;
static char *required_pkgconfig_version = NULL;
static gboolean want_silence_errors = FALSE;
static gboolean want_variable_list = FALSE;
static gboolean want_debug_spew = FALSE;
static gboolean want_verbose_errors = FALSE;
static gboolean want_stdout_errors = FALSE;
static gboolean output_opt_set = FALSE;

void
debug_spew (const char *format, ...)
{
  va_list args;
  gchar *str;
  FILE* stream;

  g_return_if_fail (format != NULL);

  if (!want_debug_spew)
    return;

  va_start (args, format);
  str = g_strdup_vprintf (format, args);
  va_end (args);

  if (want_stdout_errors)
    stream = stdout;
  else
    stream = stderr;

  fputs (str, stream);
  fflush (stream);

  g_free (str);
}

void
verbose_error (const char *format, ...)
{
  va_list args;
  gchar *str;
  FILE* stream;
  
  g_return_if_fail (format != NULL);

  if (!want_verbose_errors)
    return;

  va_start (args, format);
  str = g_strdup_vprintf (format, args);
  va_end (args);

  if (want_stdout_errors)
    stream = stdout;
  else
    stream = stderr;
  
  fputs (str, stream);
  fflush (stream);

  g_free (str);
}

static gboolean
define_variable_cb (const char *opt, const char *arg, gpointer data,
                    GError **error)
{
  char *varname;
  char *varval;
  char *tmp;

  tmp = g_strdup (arg);

  varname = tmp;
  while (*varname && isspace ((guchar)*varname))
    ++varname;

  varval = varname;
  while (*varval && *varval != '=' && *varval != ' ')
    ++varval;

  while (*varval && (*varval == '=' || *varval == ' '))
    {
      *varval = '\0';
      ++varval;
    }

  if (*varval == '\0')
    {
      fprintf (stderr, "--define-variable argument does not have a value "
               "for the variable\n");
      exit (1);
    }

  define_global_variable (varname, varval);

  g_free (tmp);
  return TRUE;
}

static gboolean
output_opt_cb (const char *opt, const char *arg, gpointer data,
               GError **error)
{
  static gboolean vercmp_opt_set = FALSE;

  /* only allow one output mode, with a few exceptions */
  if (output_opt_set)
    {
      gboolean bad_opt = TRUE;

      /* multiple flag options (--cflags --libs-only-l) allowed */
      if (pkg_flags != 0 &&
          (strcmp (opt, "--libs") == 0 ||
           strcmp (opt, "--libs-only-l") == 0 ||
           strcmp (opt, "--libs-only-other") == 0 ||
           strcmp (opt, "--libs-only-L") == 0 ||
           strcmp (opt, "--cflags") == 0 ||
           strcmp (opt, "--cflags-only-I") == 0 ||
           strcmp (opt, "--cflags-only-other") == 0))
        bad_opt = FALSE;

      /* --print-requires and --print-requires-private allowed */
      if ((want_requires && strcmp (opt, "--print-requires-private") == 0) ||
          (want_requires_private && strcmp (opt, "--print-requires") == 0))
        bad_opt = FALSE;

      /* --exists allowed with --atleast/exact/max-version */
      if (want_exists && !vercmp_opt_set &&
          (strcmp (opt, "--atleast-version") == 0 ||
           strcmp (opt, "--exact-version") == 0 ||
           strcmp (opt, "--max-version") == 0))
        bad_opt = FALSE;

      if (bad_opt)
        {
          fprintf (stderr, "Ignoring incompatible output option \"%s\"\n",
                   opt);
          return TRUE;
        }
    }

  if (strcmp (opt, "--version") == 0)
    want_my_version = TRUE;
  else if (strcmp (opt, "--modversion") == 0)
    want_version = TRUE;
  else if (strcmp (opt, "--libs") == 0)
    pkg_flags |= LIBS_ANY;
  else if (strcmp (opt, "--libs-only-l") == 0)
    pkg_flags |= LIBS_l;
  else if (strcmp (opt, "--libs-only-other") == 0)
    pkg_flags |= LIBS_OTHER;
  else if (strcmp (opt, "--libs-only-L") == 0)
    pkg_flags |= LIBS_L;
  else if (strcmp (opt, "--cflags") == 0)
    pkg_flags |= CFLAGS_ANY;
  else if (strcmp (opt, "--cflags-only-I") == 0)
    pkg_flags |= CFLAGS_I;
  else if (strcmp (opt, "--cflags-only-other") == 0)
    pkg_flags |= CFLAGS_OTHER;
  else if (strcmp (opt, "--variable") == 0)
    variable_name = g_strdup (arg);
  else if (strcmp (opt, "--exists") == 0)
    want_exists = TRUE;
  else if (strcmp (opt, "--print-variables") == 0)
    want_variable_list = TRUE;
  else if (strcmp (opt, "--uninstalled") == 0)
    want_uninstalled = TRUE;
  else if (strcmp (opt, "--atleast-version") == 0)
    {
      required_atleast_version = g_strdup (arg);
      want_exists = TRUE;
      vercmp_opt_set = TRUE;
    }
  else if (strcmp (opt, "--exact-version") == 0)
    {
      required_exact_version = g_strdup (arg);
      want_exists = TRUE;
      vercmp_opt_set = TRUE;
    }
  else if (strcmp (opt, "--max-version") == 0)
    {
      required_max_version = g_strdup (arg);
      want_exists = TRUE;
      vercmp_opt_set = TRUE;
    }
  else if (strcmp (opt, "--list-all") == 0)
    want_list = TRUE;
  else if (strcmp (opt, "--print-provides") == 0)
    want_provides = TRUE;
  else if (strcmp (opt, "--print-requires") == 0)
    want_requires = TRUE;
  else if (strcmp (opt, "--print-requires-private") == 0)
    want_requires_private = TRUE;
  else
    return FALSE;

  output_opt_set = TRUE;
  return TRUE;
}

static gboolean
pkg_uninstalled (Package *pkg)
{
  /* See if > 0 pkgs were uninstalled */
  GList *tmp;

  if (pkg->uninstalled)
    return TRUE;

  tmp = pkg->requires;
  while (tmp != NULL)
    {
      Package *pkg = tmp->data;

      if (pkg_uninstalled (pkg))
        return TRUE;

      tmp = g_list_next (tmp);
    }

  return FALSE;
}

void
print_hashtable_key (gpointer key,
                     gpointer value,
                     gpointer user_data)
{
  printf("%s\n", (gchar*)key);
}

static void
init_pc_path (void)
{
#ifdef G_OS_WIN32
  char *instdir, *lpath, *shpath;

  instdir = g_win32_get_package_installation_directory_of_module (NULL);
  if (instdir == NULL)
    {
      /* This only happens when GetModuleFilename() fails. If it does, that
       * failure should be investigated and fixed.
       */
      debug_spew ("g_win32_get_package_installation_directory_of_module failed\n");
      return;
    }

  lpath = g_build_filename (instdir, "lib", "pkgconfig", NULL);
  shpath = g_build_filename (instdir, "share", "pkgconfig", NULL);
  pkg_config_pc_path = g_strconcat (lpath, G_SEARCHPATH_SEPARATOR_S, shpath,
                                    NULL);
  g_free (instdir);
  g_free (lpath);
  g_free (shpath);
#else
  pkg_config_pc_path = PKG_CONFIG_PC_PATH;
#endif
}

static gboolean
process_package_args (const char *cmdline, GList **packages, FILE *log)
{
  gboolean success = TRUE;
  GList *reqs;

  reqs = parse_module_list (NULL, cmdline, "(command line arguments)");
  if (reqs == NULL)
    {
      fprintf (stderr, "Must specify package names on the command line\n");
      return FALSE;
    }

  for (; reqs != NULL; reqs = g_list_next (reqs))
    {
      Package *req;
      RequiredVersion *ver = reqs->data;

      /* override requested versions with cmdline options */
      if (required_exact_version)
        {
          g_free (ver->version);
          ver->comparison = EQUAL;
          ver->version = g_strdup (required_exact_version);
        }
      else if (required_atleast_version)
        {
          g_free (ver->version);
          ver->comparison = GREATER_THAN_EQUAL;
          ver->version = g_strdup (required_atleast_version);
        }
      else if (required_max_version)
        {
          g_free (ver->version);
          ver->comparison = LESS_THAN_EQUAL;
          ver->version = g_strdup (required_max_version);
        }

      if (want_short_errors)
        req = get_package_quiet (ver->name);
      else
        req = get_package (ver->name);

      if (log != NULL)
        {
          if (req == NULL)
            fprintf (log, "%s NOT-FOUND\n", ver->name);
          else
            fprintf (log, "%s %s %s\n", ver->name,
                     comparison_to_str (ver->comparison),
                     (ver->version == NULL) ? "(null)" : ver->version);
        }

      if (req == NULL)
        {
          success = FALSE;
          verbose_error ("No package '%s' found\n", ver->name);
          continue;
        }

      if (!version_test (ver->comparison, req->version, ver->version))
        {
          success = FALSE;
          verbose_error ("Requested '%s %s %s' but version of %s is %s\n",
                         ver->name,
                         comparison_to_str (ver->comparison),
                         ver->version,
                         req->name,
                         req->version);
          if (req->url)
            verbose_error ("You may find new versions of %s at %s\n",
                           req->name, req->url);
          continue;
        }

      *packages = g_list_prepend (*packages, req);
    }

  *packages = g_list_reverse (*packages);

  return success;
}

static const GOptionEntry options_table[] = {
  { "version", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
    &output_opt_cb, "output version of pkg-config", NULL },
  { "modversion", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
    &output_opt_cb, "output version for package", NULL },
  { "atleast-pkgconfig-version", 0, 0, G_OPTION_ARG_STRING,
    &required_pkgconfig_version,
    "require given version of pkg-config", "VERSION" },
  { "libs", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK, &output_opt_cb,
    "output all linker flags", NULL },
  { "static", 0, 0, G_OPTION_ARG_NONE, &want_static_lib_list,
    "output linker flags for static linking", NULL },
  { "short-errors", 0, 0, G_OPTION_ARG_NONE, &want_short_errors,
    "print short errors", NULL },
  { "libs-only-l", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
    &output_opt_cb, "output -l flags", NULL },
  { "libs-only-other", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
    &output_opt_cb, "output other libs (e.g. -pthread)", NULL },
  { "libs-only-L", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
    &output_opt_cb, "output -L flags", NULL },
  { "cflags", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK, &output_opt_cb,
    "output all pre-processor and compiler flags", NULL },
  { "cflags-only-I", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
    &output_opt_cb, "output -I flags", NULL },
  { "cflags-only-other", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
    &output_opt_cb, "output cflags not covered by the cflags-only-I option",
    NULL },
  { "variable", 0, 0, G_OPTION_ARG_CALLBACK, &output_opt_cb,
    "get the value of variable named NAME", "NAME" },
  { "define-variable", 0, 0, G_OPTION_ARG_CALLBACK, &define_variable_cb,
    "set variable NAME to VALUE", "NAME=VALUE" },
  { "exists", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK, &output_opt_cb,
    "return 0 if the module(s) exist", NULL },
  { "print-variables", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
    &output_opt_cb, "output list of variables defined by the module", NULL },
  { "uninstalled", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
    &output_opt_cb, "return 0 if the uninstalled version of one or more "
    "module(s) or their dependencies will be used", NULL },
  { "atleast-version", 0, 0, G_OPTION_ARG_CALLBACK, &output_opt_cb,
    "return 0 if the module is at least version VERSION", "VERSION" },
  { "exact-version", 0, 0, G_OPTION_ARG_CALLBACK, &output_opt_cb,
    "return 0 if the module is at exactly version VERSION", "VERSION" },
  { "max-version", 0, 0, G_OPTION_ARG_CALLBACK, &output_opt_cb,
    "return 0 if the module is at no newer than version VERSION", "VERSION" },
  { "list-all", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
    &output_opt_cb, "list all known packages", NULL },
  { "debug", 0, 0, G_OPTION_ARG_NONE, &want_debug_spew,
    "show verbose debug information", NULL },
  { "print-errors", 0, 0, G_OPTION_ARG_NONE, &want_verbose_errors,
    "show verbose information about missing or conflicting packages "
    "(default unless --exists or --atleast/exact/max-version given on the "
    "command line)", NULL },
  { "silence-errors", 0, 0, G_OPTION_ARG_NONE, &want_silence_errors,
    "be silent about errors (default when --exists or "
    "--atleast/exact/max-version given on the command line)", NULL },
  { "errors-to-stdout", 0, 0, G_OPTION_ARG_NONE, &want_stdout_errors,
    "print errors from --print-errors to stdout not stderr", NULL },
  { "print-provides", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
    &output_opt_cb, "print which packages the package provides", NULL },
  { "print-requires", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
    &output_opt_cb, "print which packages the package requires", NULL },
  { "print-requires-private", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
    &output_opt_cb, "print which packages the package requires for static "
    "linking", NULL },
#ifdef G_OS_WIN32
  { "dont-define-prefix", 0, 0, G_OPTION_ARG_NONE, &dont_define_prefix,
    "don't try to override the value of prefix for each .pc file found with "
    "a guesstimated value based on the location of the .pc file", NULL },
  { "prefix-variable", 0, 0, G_OPTION_ARG_STRING, &prefix_variable,
    "set the name of the variable that pkg-config automatically sets",
    "PREFIX" },
  { "msvc-syntax", 0, 0, G_OPTION_ARG_NONE, &msvc_syntax,
    "output -l and -L flags for the Microsoft compiler (cl)", NULL },
#endif
  { NULL, 0, 0, 0, NULL, NULL, NULL }
};

int
main (int argc, char **argv)
{
  GString *str;
  GList *packages = NULL;
  char *search_path;
  char *pcbuilddir;
  gboolean need_newline;
  FILE *log = NULL;
  GError *error = NULL;
  GOptionContext *opt_context;

  /* This is here so that we get debug spew from the start,
   * during arg parsing
   */
  if (getenv ("PKG_CONFIG_DEBUG_SPEW"))
    {
      want_debug_spew = TRUE;
      want_verbose_errors = TRUE;
      want_silence_errors = FALSE;
      debug_spew ("PKG_CONFIG_DEBUG_SPEW variable enabling debug spew\n");
    }


  /* Get the built-in search path */
  init_pc_path ();
  if (pkg_config_pc_path == NULL)
    {
      /* Even when we override the built-in search path, we still use it later
       * to add pc_path to the virtual pkg-config package.
       */
      verbose_error ("Failed to get default search path\n");
      exit (1);
    }

  search_path = getenv ("PKG_CONFIG_PATH");
  if (search_path) 
    {
      add_search_dirs(search_path, G_SEARCHPATH_SEPARATOR_S);
    }
  if (getenv("PKG_CONFIG_LIBDIR") != NULL) 
    {
      add_search_dirs(getenv("PKG_CONFIG_LIBDIR"), G_SEARCHPATH_SEPARATOR_S);
    }
  else
    {
      add_search_dirs(pkg_config_pc_path, G_SEARCHPATH_SEPARATOR_S);
    }

  pcsysrootdir = getenv ("PKG_CONFIG_SYSROOT_DIR");
  if (pcsysrootdir)
    {
      define_global_variable ("pc_sysrootdir", pcsysrootdir);
    }
  else
    {
      define_global_variable ("pc_sysrootdir", "/");
    }

  pcbuilddir = getenv ("PKG_CONFIG_TOP_BUILD_DIR");
  if (pcbuilddir)
    {
      define_global_variable ("pc_top_builddir", pcbuilddir);
    }
  else
    {
      /* Default appropriate for automake */
      define_global_variable ("pc_top_builddir", "$(top_builddir)");
    }

  if (getenv ("PKG_CONFIG_DISABLE_UNINSTALLED"))
    {
      debug_spew ("disabling auto-preference for uninstalled packages\n");
      disable_uninstalled = TRUE;
    }

  /* Parse options */
  opt_context = g_option_context_new (NULL);
  g_option_context_add_main_entries (opt_context, options_table, NULL);
  if (!g_option_context_parse(opt_context, &argc, &argv, &error))
    {
      fprintf (stderr, "%s\n", error->message);
      return 1;
    }

  /* If no output option was set, then --exists is the default. */
  if (!output_opt_set)
    {
      debug_spew ("no output option set, defaulting to --exists\n");
      want_exists = TRUE;
    }

  /* Error printing is determined as follows:
   *     - for all output options besides --exists and --*-version,
   *       it's on by default and --silence-errors can turn it off
   *     - for --exists, --*-version, etc. and no options at all,
   *       it's off by default and --print-errors will turn it on
   */
  if (!want_exists)
    {
      debug_spew ("Error printing enabled by default due to use of output "
                  "options besides --exists or --atleast/exact/max-version. "
                  "Value of --silence-errors: %d\n",
                  want_silence_errors);

      if (want_silence_errors && getenv ("PKG_CONFIG_DEBUG_SPEW") == NULL)
        want_verbose_errors = FALSE;
      else
        want_verbose_errors = TRUE;
    }
  else
    {
      debug_spew ("Error printing disabled by default due to use of output "
                  "options --exists, --atleast/exact/max-version or no "
                  "output option at all. Value of --print-errors: %d\n",
                  want_verbose_errors);

      /* Leave want_verbose_errors unchanged, reflecting --print-errors */
    }

  if (want_verbose_errors)
    debug_spew ("Error printing enabled\n");
  else
    debug_spew ("Error printing disabled\n");

  if (want_static_lib_list)
    enable_private_libs();
  else
    disable_private_libs();

  /* honor Requires.private if any Cflags are requested or any static
   * libs are requested */

  if (pkg_flags & CFLAGS_ANY || want_requires_private || want_exists ||
      (want_static_lib_list && (pkg_flags & LIBS_ANY)))
    enable_requires_private();

  /* ignore Requires if no Cflags or Libs are requested */

  if (pkg_flags == 0 && !want_requires && !want_exists)
    disable_requires();

  if (want_my_version)
    {
      printf ("%s\n", VERSION);
      return 0;
    }

  if (required_pkgconfig_version)
    {
      if (compare_versions (VERSION, required_pkgconfig_version) >= 0)
        return 0;
      else
        return 1;
    }

  package_init ();

  if (want_list)
    {
      print_package_list ();
      return 0;
    }

  /* Collect packages from remaining args */
  str = g_string_new ("");
  while (argc > 1)
    {
      argc--;
      argv++;

      g_string_append (str, *argv);
      g_string_append (str, " ");
    }

  g_option_context_free (opt_context);

  g_strstrip (str->str);

  if (getenv("PKG_CONFIG_LOG") != NULL)
    {
      log = fopen (getenv ("PKG_CONFIG_LOG"), "a");
      if (log == NULL)
	{
	  fprintf (stderr, "Cannot open log file: %s\n",
		   getenv ("PKG_CONFIG_LOG"));
	  exit (1);
	}
    }

  /* find and parse each of the packages specified */
  if (!process_package_args (str->str, &packages, log))
    return 1;

  if (log != NULL)
    fclose (log);

  g_string_free (str, TRUE);

  if (want_exists)
    return 0; /* if we got here, all the packages existed. */

  if (want_variable_list)
    {
      GList *tmp;
      tmp = packages;
      while (tmp != NULL)
        {
          Package *pkg = tmp->data;
          if (pkg->vars != NULL)
            g_hash_table_foreach(pkg->vars,
                                 &print_hashtable_key,
                                 NULL);
          tmp = g_list_next (tmp);
          if (tmp) printf ("\n");
        }
      need_newline = FALSE;
    }

  if (want_uninstalled)
    {
      /* See if > 0 pkgs (including dependencies recursively) were uninstalled */
      GList *tmp;
      tmp = packages;
      while (tmp != NULL)
        {
          Package *pkg = tmp->data;

          if (pkg_uninstalled (pkg))
            return 0;

          tmp = g_list_next (tmp);
        }

      return 1;
    }

  if (want_version)
    {
      GList *tmp;
      tmp = packages;
      while (tmp != NULL)
        {
          Package *pkg = tmp->data;

          printf ("%s\n", pkg->version);

          tmp = g_list_next (tmp);
        }
    }

 if (want_provides)
   {
     GList *tmp;
     tmp = packages;
     while (tmp != NULL)
       {
         Package *pkg = tmp->data;
         char *key;
         key = pkg->key;
         while (*key == '/')
           key++;
         if (strlen(key) > 0)
           printf ("%s = %s\n", key, pkg->version);
         tmp = g_list_next (tmp);
       }
   }

  if (want_requires)
    {
      GList *pkgtmp;
      for (pkgtmp = packages; pkgtmp != NULL; pkgtmp = g_list_next (pkgtmp))
        {
          Package *pkg = pkgtmp->data;
          GList *reqtmp;

          /* process Requires: */
          for (reqtmp = pkg->requires; reqtmp != NULL; reqtmp = g_list_next (reqtmp))
            {
              Package *deppkg = reqtmp->data;
              RequiredVersion *req;
              req = g_hash_table_lookup(pkg->required_versions, deppkg->key);
              if ((req == NULL) || (req->comparison == ALWAYS_MATCH))
                printf ("%s\n", deppkg->key);
              else
                printf ("%s %s %s\n", deppkg->key,
                  comparison_to_str(req->comparison),
                  req->version);
            }
        }
    }
  if (want_requires_private)
    {
      GList *pkgtmp;
      for (pkgtmp = packages; pkgtmp != NULL; pkgtmp = g_list_next (pkgtmp))
        {
          Package *pkg = pkgtmp->data;
          GList *reqtmp;
          /* process Requires.private: */
          for (reqtmp = pkg->requires_private; reqtmp != NULL; reqtmp = g_list_next (reqtmp))
            {

              Package *deppkg = reqtmp->data;
              RequiredVersion *req;

              if (g_list_find (pkg->requires, reqtmp->data))
                continue;

              req = g_hash_table_lookup(pkg->required_versions, deppkg->key);
              if ((req == NULL) || (req->comparison == ALWAYS_MATCH))
                printf ("%s\n", deppkg->key);
              else
                printf ("%s %s %s\n", deppkg->key,
                  comparison_to_str(req->comparison),
                  req->version);
            }
        }
    }
  
  /* Print all flags; then print a newline at the end. */
  need_newline = FALSE;

  if (variable_name)
    {
      char *str = packages_get_var (packages, variable_name);
      printf ("%s", str);
      g_free (str);
      need_newline = TRUE;
    }

  if (pkg_flags != 0)
    {
      char *str = packages_get_flags (packages, pkg_flags);
      printf ("%s", str);
      g_free (str);
      need_newline = TRUE;
    }

  if (need_newline)
    printf ("\n");

  return 0;
}