Merge pull request #4701 from rgerhards/MAXPATHLEN

build issue: handle undefined MAXPATHLEN

configure.ac

@@ -149,6 +149,20 @@ AS_IF([test -d "$srcdir"/.git && ! test -f  "$srcdir"/.tarball-version], [in_git
 
 AC_DEFINE_UNQUOTED([HOSTENV], "$host", [the host environment, can be queried via a system variable])
 
+# Some Unix systems, like Gnu Hurd, don't define PATH_MAX
+AC_MSG_CHECKING([for PATH_MAX])
+AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([[#include <limits.h>]],
+                                    [[char checker[PATH_MAX];]])],
+                   [
+                      AC_MSG_RESULT([yes])
+                    ],
+                    [
+                      AC_MSG_RESULT([no, mocking PATH_MAX = 4096])
+                      AC_DEFINE([PATH_MAX], 4096, [replacement for missing PATH_MAX])
+                      AC_DEFINE([MAXPATHLEN], 4096, [replacement for missing PATH_MAX]) # we assume this does not exit
+                    ]
+                 )
+
 # Checks for libraries.
 save_LIBS=$LIBS
 LIBS=

runtime/modules.c

@@ -49,10 +49,6 @@
 #include <unistd.h>
 #include <sys/file.h>
 
-#ifndef PATH_MAX
-#	define PATH_MAX MAXPATHLEN
-#endif
-
 #include "rsyslog.h"
 #include "rainerscript.h"
 #include "cfsysline.h"
@@ -1101,11 +1097,7 @@ Load(uchar *const pModName, const sbool bConfLoad, struct nvlst *const lst)
 	uchar *pModDirCurr, *pModDirNext;
 	int iLoadCnt;
 	struct dlhandle_s *pHandle = NULL;
-#	ifdef PATH_MAX
 	uchar pathBuf[PATH_MAX+1];
-#	else
-	uchar pathBuf[4096];
-#	endif
 	uchar *pPathBuf = pathBuf;
 	size_t lenPathBuf = sizeof(pathBuf);
 	rsRetVal localRet;