doc: Update some more macro descriptions.

* doc/autoconf.texi (Particular Functions): Add a remark about AC_FUNC_MMAP.
Clarify AC_FUNC_STRCOLL.

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 79ecc9dad0d6e6619222f528b4672b2ffafa82eb..2a279ef2b7ef4392eda7f9236f7da65a7c217a64 100644 (file)
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -5393,6 +5393,10 @@ memory.
 
 The result of this macro is cached in the
 @code{ac_cv_func_mmap_fixed_mapped} variable.
+
+Note: This macro asks for more than what an average program needs from
+@code{mmap}.  In particular, the use of @code{MAP_FIXED} fails on
+HP-UX 11, whereas @code{mmap} otherwise works fine on this platform.
 @end defmac
 
 @defmac AC_FUNC_OBSTACK
@@ -5509,7 +5513,8 @@ New programs need not use these macros.
 If the @code{strcoll} function exists and works correctly, define
 @code{HAVE_STRCOLL}.  This does a bit more than
 @samp{AC_CHECK_FUNCS(strcoll)}, because some systems have incorrect
-definitions of @code{strcoll} that should not be used.
+definitions of @code{strcoll} that should not be used.  But it does
+not check against a known bug of this function on Solaris 10.
 
 The result of this macro is cached in the @code{ac_cv_func_strcoll_works}
 variable.