Protection against spaces in $PATH

[Pavel Roskin]

Hello!

While running the testsuite on Cygwin I have found that AC_PROG_AWK fails
just because there are directories with spaces in PATH.

No, I don't think that Autoconf should quote everything and protect
against spaces in every filename. Nevertheless, it should be safe just to
scan $PATH, however you may still have a problem if your awk is indeed in
//C/Program Files/Visual AWK/bin/awk :-)

So I checked the places where $PATH is used and ensured that there is
proper quoting around $ac_dir.

Now the testsuite passes on CygWin 1.1.4, WinNT 4.0 SP6. There has been
one more quirk - I had to make a link from "gcc" to "cc" because
AC_PROG_CPP assumes that $CC is set and uses "cc" otherwise.

ChangeLog:
        * acgeneral.m4 (AC_CHECK_PROG): Added protection against spaces
        in $PATH.
        * acspecific.m4 (AC_PROG_INSTALL): Likewise.

Regards,
Pavel Roskin

___________________________
Index: acgeneral.m4
--- acgeneral.m4        Tue Sep 26 10:47:22 2000
+++ acgeneral.m4        Tue Sep 26 11:02:05 2000
@@ -2988,7 +2988,7 @@
 m4_ifvanl([$6],
 [  ac_prog_rejected=no])dnl
   AC_SHELL_PATH_WALK([$5],
-[test -f $ac_dir/$ac_word || continue
+[test -f "$ac_dir/$ac_word" || continue
 m4_ifvanl([$6],
 [if test "$ac_dir/$ac_word" = "$6"; then
   ac_prog_rejected=yes
@@ -3058,7 +3058,7 @@
   *)
   AC_SHELL_PATH_WALK([$4],
 [if test -f "$ac_dir/$ac_word"; then
-   ac_cv_path_$1=$ac_dir/$ac_word
+   ac_cv_path_$1="$ac_dir/$ac_word"
    break
 fi])
 dnl If no 3rd arg is given, leave the cache variable unset,
Index: acspecific.m4
--- acspecific.m4       Tue Sep 26 10:47:23 2000
+++ acspecific.m4       Tue Sep 26 10:51:02 2000
@@ -221,13 +221,13 @@
       # Don't use installbsd from OSF since it installs stuff as root
       # by default.
       for ac_prog in ginstall scoinst install; do
-        if test -f $ac_dir/$ac_prog; then
+        if test -f "$ac_dir/$ac_prog"; then
          if test $ac_prog = install &&
-            grep dspmsg $ac_dir/$ac_prog >/dev/null 2>&1; then
+            grep dspmsg "$ac_dir/$ac_prog" >/dev/null 2>&1; then
            # AIX install.  It has an incompatible calling convention.
            :
          elif test $ac_prog = install &&
-           grep pwplus $ac_dir/$ac_prog >/dev/null 2>&1; then
+           grep pwplus "$ac_dir/$ac_prog" >/dev/null 2>&1; then
            # program-specific install script used by HP pwplus--don't use.
            :
          else
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