add (or restore) config.h to all files

The autoconf-generated config.h contains a number of directives which
may alter the behaviour of system headers on certain platforms. Always
include it in every C++ file as the first include.

Closes #2993.

src/autoload.cpp

@@ -1,4 +1,6 @@
 // The classes responsible for autoloading functions and completions.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <errno.h>
 #include <pthread.h>

src/builtin.cpp

@@ -15,6 +15,7 @@
 // Check the other builtin manuals for proper syntax.
 //
 // 4). Use 'git add doc_src/NAME.txt' to start tracking changes to the documentation file.
+#include "config.h"  // IWYU pragma: keep
 
 #include <assert.h>
 #include <errno.h>

src/builtin_commandline.cpp

@@ -1,4 +1,6 @@
 // Functions used for implementing the commandline builtin.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <errno.h>
 #include <pthread.h>

src/builtin_complete.cpp

@@ -1,4 +1,6 @@
 // Functions used for implementing the complete builtin.
+#include "config.h"  // IWYU pragma: keep
+
 #include <stdbool.h>
 #include <stdlib.h>
 #include <wchar.h>

src/builtin_printf.cpp

@@ -48,6 +48,7 @@
 // David MacKenzie <djm@gnu.ai.mit.edu>
 
 // This file has been imported from source code of printf command in GNU Coreutils version 6.9.
+#include "config.h"  // IWYU pragma: keep
 
 #include <errno.h>
 #include <limits.h>

src/builtin_set.cpp

@@ -1,4 +1,6 @@
 // Functions used for implementing the set builtin.
+#include "config.h"  // IWYU pragma: keep
+
 #include <errno.h>
 #include <stdbool.h>
 #include <stdlib.h>

src/builtin_test.cpp

@@ -1,6 +1,8 @@
 // Functions used for implementing the test builtin.
 //
 // Implemented from scratch (yes, really) by way of IEEE 1003.1 as reference.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <stdarg.h>
 #include <stdbool.h>

src/builtin_ulimit.cpp

@@ -1,4 +1,6 @@
 // Functions used for implementing the ulimit builtin.
+#include "config.h"  // IWYU pragma: keep
+
 #include <errno.h>
 #include <sys/resource.h>
 #include <wchar.h>

src/color.cpp

@@ -1,4 +1,6 @@
 // Color class implementation.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <stdint.h>
 #include <stdlib.h>

src/complete.cpp

@@ -3,6 +3,8 @@
   These functions are used for storing and retrieving tab-completion data, as well as for performing
   tab-completion.
 */
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <pthread.h>
 #include <pwd.h>

src/env.cpp

@@ -1,4 +1,6 @@
 // Functions for setting and getting environment variables.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <errno.h>
 #include <locale.h>

src/event.cpp

@@ -1,4 +1,6 @@
 // Functions for handling event triggers.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <signal.h>
 #include <stdbool.h>

src/fish_indent.cpp

@@ -15,6 +15,8 @@ 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <getopt.h>
 #include <locale.h>

src/fish_key_reader.cpp

@@ -6,6 +6,8 @@
 // carriage-return (\cM) and newline (\cJ).
 //
 // Type "exit" or "quit" to terminate the program.
+#include "config.h"  // IWYU pragma: keep
+
 #include <getopt.h>
 #include <locale.h>
 #include <signal.h>

src/fish_tests.cpp

@@ -1,4 +1,5 @@
 // Various bug and feature tests. Compiled and run by make test.
+#include "config.h"  // IWYU pragma: keep
 
 // IWYU pragma: no_include <cstring>
 // IWYU pragma: no_include <cstddef>

src/function.cpp

@@ -2,6 +2,8 @@
 // autoloading functions in the $fish_function_path. Actual function evaluation is taken care of by
 // the parser and to some degree the builtin handling library.
 //
+#include "config.h"  // IWYU pragma: keep
+
 // IWYU pragma: no_include <type_traits>
 #include <dirent.h>
 #include <pthread.h>

src/highlight.cpp

@@ -1,4 +1,6 @@
 // Functions for syntax highlighting.
+#include "config.h"  // IWYU pragma: keep
+
 // IWYU pragma: no_include <cstddef>
 #include <dirent.h>
 #include <errno.h>

src/history.cpp

@@ -1,4 +1,6 @@
 // History functions, part of the user interface.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>

src/intern.cpp

@@ -1,4 +1,6 @@
 // Library for pooling common strings.
+#include "config.h"  // IWYU pragma: keep
+
 #include <pthread.h>
 #include <stdbool.h>
 #include <stddef.h>

src/io.cpp

@@ -1,4 +1,6 @@
 // Utilities for io redirection.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <errno.h>
 #include <stddef.h>

src/iothread.cpp

@@ -1,3 +1,5 @@
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <fcntl.h>
 #include <limits.h>

src/kill.cpp

@@ -2,6 +2,8 @@
 //
 // Works like the killring in emacs and readline. The killring is cut and paste with a memory of
 // previous cuts. It supports integration with the X clipboard.
+#include "config.h"  // IWYU pragma: keep
+
 #include <stdbool.h>
 #include <stddef.h>
 #include <algorithm>

src/pager.cpp

@@ -1,3 +1,5 @@
+#include "config.h"  // IWYU pragma: keep
+
 // IWYU pragma: no_include <cstddef>
 #include <assert.h>
 #include <stddef.h>

src/parse_execution.cpp

@@ -6,6 +6,8 @@
 //
 // Non-fatal errors are printed as soon as they are encountered; otherwise you would have to wait
 // for the execution to finish to see them.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <errno.h>
 #include <stdarg.h>

src/parse_productions.cpp

@@ -1,3 +1,5 @@
+#include "config.h"  // IWYU pragma: keep
+
 #include <stdio.h>
 
 #include "common.h"

src/parse_tree.cpp

@@ -1,4 +1,6 @@
 // Programmatic representation of fish code.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <stdarg.h>
 #include <stddef.h>

src/parse_util.cpp

@@ -2,6 +2,8 @@
 //
 // This library can be seen as a 'toolbox' for functions that are used in many places in fish and
 // that are somehow related to parsing the code.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <stdarg.h>
 #include <stdbool.h>

src/parser.cpp

@@ -1,4 +1,6 @@
 // The fish parser. Contains functions for parsing and evaluating code.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <stdbool.h>
 #include <stdio.h>

src/parser_keywords.cpp

@@ -1,4 +1,6 @@
 // Functions having to do with parser keywords, like testing if a function is a block command.
+#include "config.h"  // IWYU pragma: keep
+
 #include "parser_keywords.h"
 #include "common.h"
 #include "fallback.h"  // IWYU pragma: keep

src/path.cpp

@@ -1,6 +1,8 @@
 // Directory utilities. This library contains functions for locating configuration directories, for
 // testing if a command with a given name can be found in the PATH, and various other path-related
 // issues.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <errno.h>
 #include <sys/stat.h>

src/postfork.cpp

@@ -1,4 +1,6 @@
 // Functions that we may safely call after fork().
+#include "config.h"  // IWYU pragma: keep
+
 #include <errno.h>
 #include <fcntl.h>
 #include <signal.h>

src/print_help.cpp

@@ -1,4 +1,6 @@
 // Print help message for the specified command.
+#include "config.h"  // IWYU pragma: keep
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

src/sanity.cpp

@@ -1,4 +1,6 @@
 // Functions for performing sanity checks on the program state.
+#include "config.h"  // IWYU pragma: keep
+
 #include <unistd.h>
 
 #include "common.h"

src/signal.cpp

@@ -1,4 +1,6 @@
 // The library for various signal related issues.
+#include "config.h"  // IWYU pragma: keep
+
 #include <errno.h>
 #include <signal.h>
 #include <stdio.h>

src/tokenizer.cpp

@@ -1,5 +1,7 @@
 // A specialized tokenizer for tokenizing the fish language. In the future, the tokenizer should be
 // extended to support marks, tokenizing multiple strings and disposing of unused string segments.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <fcntl.h>
 #include <limits.h>

src/utf8.cpp

@@ -13,6 +13,8 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
+#include "config.h"  // IWYU pragma: keep
+
 #include <stdint.h>  // IWYU pragma: keep
 #include <sys/types.h>
 #include <limits>

src/util.cpp

@@ -1,6 +1,8 @@
 // Generic utilities library.
 //
 // Contains data structures such as automatically growing array lists, priority queues, etc.
+#include "config.h"  // IWYU pragma: keep
+
 #include <errno.h>
 #include <stdlib.h>
 #include <sys/time.h>

src/wcstringutil.cpp

@@ -1,4 +1,6 @@
 // Helper functions for working with wcstring.
+#include "config.h"  // IWYU pragma: keep
+
 #include "wcstringutil.h"
 #include "common.h"
 

src/wildcard.cpp

@@ -1,5 +1,7 @@
 // Fish needs it's own globbing implementation to support tab-expansion of globbed parameters. Also
 // provides recursive wildcards using **.
+#include "config.h"  // IWYU pragma: keep
+
 #include <assert.h>
 #include <dirent.h>
 #include <errno.h>