Hi Vincent,
For example, a simple script like this in the main configure may be enough (or
maybe wrapped into an autoconf macro) :
echo a >file
if test `cat file` != a
then
echo \`cat\` bug detected.
echo Please run configure from on a binmode filesystem
echo or use the igncr trick
exit 1
fi
At which point the user goes:
"igncr trick" ? What "igncr trick" ?
So we would have to be a bit more explicit. How about modifying the
configure patch already suggested to perform the cat check instead ? I
have attached a patch that should do this, although I have not checked
it - would you care to try it out for me ?
Cheers
Nick
Index: configure.ac
===================================================================
--- configure.ac (revision 125308)
+++ configure.ac (working copy)
@@ -965,6 +965,7 @@ case "${host}" in
host_makefile_frag="config/mh-djgpp"
;;
*-cygwin*)
+ ACX_CHECK_CYGWIN_CAT_WORKS
host_makefile_frag="config/mh-cygwin"
;;
*-mingw32*)
Index: configure
===================================================================
--- configure (revision 125308)
+++ configure (working copy)
@@ -2676,6 +2676,32 @@ case "${host}" in
host_makefile_frag="config/mh-djgpp"
;;
*-cygwin*)
+
+echo "$as_me:$LINENO: checking to see if cat works as expected" >&5
+echo $ECHO_N "checking to see if cat works as expected... $ECHO_C" >&6
+echo a >cygwin-cat-check
+if test `cat cygwin-cat-check` == a ; then
+ echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6
+else
+ echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6
+ { { echo "$as_me:$LINENO: error: The cat command does not ignore carriage
return characters.
+ Please either mount the build directory in binary mode or run the following
+ commands before running any configure script:
+set -o igncr
+export SHELLOPTS
+ " >&5
+echo "$as_me: error: The cat command does not ignore carriage return
characters.
+ Please either mount the build directory in binary mode or run the following
+ commands before running any configure script:
+set -o igncr
+export SHELLOPTS
+ " >&2;}
+ { (exit 1); exit 1; }; }
+rm cygwin-cat-check
+fi
+
host_makefile_frag="config/mh-cygwin"
;;
*-mingw32*)
Index: config/acx.m4
===================================================================
--- config/acx.m4 (revision 125308)
+++ config/acx.m4 (working copy)
@@ -597,3 +597,25 @@ AC_DEFUN([ACX_BUGURL],[
AC_SUBST(REPORT_BUGS_TO)
AC_SUBST(REPORT_BUGS_TEXI)
])
+
+dnl ####
+dnl # ACX_CHECK_CYGWIN_CAT_WORKS
+dnl # On Cygwin hosts, check that the cat command ignores
+dnl # carriage returns as otherwise builds will not work.
+dnl # See binutils PR 4334 for more details.
+AC_DEFUN([ACX_CHECK_CYGWIN_CAT_WORKS],[
+AC_MSG_CHECKING([to see if cat works as expected])
+echo a >cygwin-cat-check
+if test `cat cygwin-cat-check` == a ; then
+ AC_MSG_RESULT(yes)
+else
+ AC_MSG_RESULT(no)
+ AC_MSG_ERROR([The cat command does not ignore carriage return characters.
+ Please either mount the build directory in binary mode or run the following
+ commands before running any configure script:
+set -o igncr
+export SHELLOPTS
+ ])
+rm cygwin-cat-check
+fi
+])
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