compat: rename {,notmuch_}canonicalize_file_name

When compat canonicalize_file_name was introduced, it was limited to
C code only because it was used by C code only during that time.

>From 5ec6fd4d, (lib/open: check for split configuration when creating
database., 2021-02-16), lib/open.cc, which is C++, relies on the
existent of canonicalize_file_name.

However, we can't blindly enable canonicalize_file_name for C++ code,
because different implementation has different additional signature for
C++ and users can arbitrarily add -DHAVE_CANONICALIZE_FILE_NAME=0 to
{C,CXX}FLAGS.

Let's move our implementation into a util library.

Helped-by: Tomi Ollila <tomi.ollila@iki.fi>
Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/util/path-util.h b/util/path-util.h
new file mode 100644
index 00000000..ac85f696
--- /dev/null
+++ b/util/path-util.h
@@ -0,0 +1,19 @@
+/*
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#ifndef NOTMUCH_UTIL_PATH_UTIL_H_
+#define NOTMUCH_UTIL_PATH_UTIL_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+char *
+notmuch_canonicalize_file_name (const char *path);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NOTMUCH_UTIL_PATH_UTIL_H_ */