Flatten GNU Make directory structure

third_party/make/findprog.h

@@ -0,0 +1,71 @@
+/* clang-format off */
+/* clang-format off */
+/* Locating a program in PATH.
+   Copyright (C) 2001-2003, 2009-2020 Free Software Foundation, Inc.
+   Written by Bruno Haible <haible@clisp.cons.org>, 2001.
+
+   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 3 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, see <https://www.gnu.org/licenses/>.  */
+
+#ifndef _FINDPROG_H
+#define _FINDPROG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Looks up a program in the PATH.
+   Attempts to determine the pathname that would be called by execlp/execvp
+   of PROGNAME.  If successful, it returns a pathname containing a slash
+   (either absolute or relative to the current directory).  Otherwise, it
+   returns PROGNAME unmodified.
+   Because of the latter case, callers should use execlp/execvp, not
+   execl/execv on the returned pathname.
+   The returned string is freshly malloc()ed if it is != PROGNAME.  */
+extern const char *find_in_path (const char *progname);
+
+/* Looks up a program in the given PATH-like string.
+
+   The PATH argument consists of a list of directories, separated by ':' or
+   (on native Windows) by ';'.  An empty PATH element designates the current
+   directory.  A null PATH is equivalent to an empty PATH, that is, to the
+   singleton list that contains only the current directory.
+
+   Determines the pathname that would be called by execlp/execvp of PROGNAME.
+   - If successful, it returns a pathname containing a slash (either absolute
+     or relative to the current directory).  The returned string can be used
+     with either execl/execv or execlp/execvp.  It is freshly malloc()ed if it
+     is != PROGNAME.
+   - Otherwise, it sets errno and returns NULL.
+     Specific errno values include:
+       - ENOENT: means that the program's file was not found.
+       - EACCES: means that the program's file cannot be accessed (due to some
+         issue with one of the ancestor directories) or lacks the execute
+         permissions.
+   If OPTIMIZE_FOR_EXEC is true, the function saves some work, under the
+   assumption that the resulting pathname will not be accessed directly,
+   only through execl/execv or execlp/execvp.
+
+   Here, a "slash" means:
+     - On POSIX systems excluding Cygwin: a '/',
+     - On Windows, OS/2, DOS platforms: a '/' or '\'. */
+extern const char *find_in_given_path (const char *progname, const char *path,
+                                       bool optimize_for_exec);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _FINDPROG_H */