Merge branch 'ps/no-writable-strings'

Building with "-Werror -Wwrite-strings" is now supported.

* ps/no-writable-strings: (27 commits)
  config.mak.dev: enable `-Wwrite-strings` warning
  builtin/merge: always store allocated strings in `pull_twohead`
  builtin/rebase: always store allocated string in `options.strategy`
  builtin/rebase: do not assign default backend to non-constant field
  imap-send: fix leaking memory in `imap_server_conf`
  imap-send: drop global `imap_server_conf` variable
  mailmap: always store allocated strings in mailmap blob
  revision: always store allocated strings in output encoding
  remote-curl: avoid assigning string constant to non-const variable
  send-pack: always allocate receive status
  parse-options: cast long name for OPTION_ALIAS
  http: do not assign string constant to non-const field
  compat/win32: fix const-correctness with string constants
  pretty: add casts for decoration option pointers
  object-file: make `buf` parameter of `index_mem()` a constant
  object-file: mark cached object buffers as const
  ident: add casts for fallback name and GECOS
  entry: refactor how we remove items for delayed checkouts
  line-log: always allocate the output prefix
  line-log: stop assigning string constant to file parent buffer
  ...

1 files changed, 6 insertions, 6 deletions

diff --git a/userdiff.h b/userdiff.h
index cc8e5abfef..d726804c3e 100644
--- a/userdiff.h
+++ b/userdiff.h
@@ -7,19 +7,19 @@ struct index_state;
 struct repository;
 
 struct userdiff_funcname {
-	char *pattern;
+	const char *pattern;
 	int cflags;
 };
 
 struct userdiff_driver {
 	const char *name;
-	char *external;
-	char *algorithm;
+	const char *external;
+	const char *algorithm;
 	int binary;
 	struct userdiff_funcname funcname;
-	char *word_regex;
-	char *word_regex_multi_byte;
-	char *textconv;
+	const char *word_regex;
+	const char *word_regex_multi_byte;
+	const char *textconv;
 	struct notes_cache *textconv_cache;
 	int textconv_want_cache;
 };