* Makefile.in: Autogenerate some header files which provide magic numbers.

Force dependencies for files which depend on autogenerated headers to ensure
that they are always built.
* child_info.h (child_info): Add new fields to accommodate new magic number
header stuff.
* dcrt0.cc: Rely on "child_info_magic.h" to ensure that correct child_info
magic numbers are used.
(dll_crt0_1): Temporarily remove _cygwin_testing_magic test.
(_dll_crt0): Do more testing on magic numbers from fork_info structure.  Call
"multiple_cygwin_problem" where appropriate.
(multiple_cygwin_problem): Rename from multiple_cygwin_die.  Issue a warning or
die, as appropriate based on cygwin version/magic number mismatch.
* pinfo.cc (pinfo::exit): Don't attempt to dereference `this' if it doesn't
exist.  This can happen when a fatal error occurs early in process
initialization.
* shared.cc: Rely on "shared_info_magic.h" to accommodate that new magic number
header stuff.
(shared_info::initialize): Use new magic number stuff, for shared region.
(memory_init): Ditto, for mount table.
* shared_info.h: Accomodate new magic number stuff for shared region and mount
table.
* sigproc.cc: Rely on "child_info_magic.h" to accommodate new magic number
header stuff.
(init_child_info): Initialize new fields in child_info) to accomodate magic
numbers.
* winsup.h: Rename multiple_cygwin_die to multiple_cygwin_problem.
* include/cygwin/version.h: Define macros for manipulating version magic.
* cygmagic: New shell script for generating magic numbers.

1 files changed, 20 insertions, 0 deletions

diff --git a/winsup/cygwin/cygmagic b/winsup/cygwin/cygmagic
new file mode 100755
index 000000000..17c74b496
--- /dev/null
+++ b/winsup/cygwin/cygmagic
@@ -0,0 +1,20 @@
+#!/bin/sh
+file_magic=$1; shift
+gcc=$1; shift
+file=$1; shift
+trap "rm -f /tmp/$$.magic" 0 1 2 15
+cat <<EOF > $file_magic
+/* autogenerated - do not edit */
+#include "$file"
+EOF
+while [ -n "$1" ]; do
+    define=$1; shift
+    struct=$1; shift
+    sum=`$gcc -E $file | sed -n "/^$struct/,/^};/p" | sed -e 's/[ 	]//g' -e '/^$/d' | sum | awk '{print "obase=16;\"0x\";", $1}' | bc | tr '[A-Z]' '[a-z]'`
+    echo "#define $define $sum"
+    curr=`sed -n "s/^#[ 	]*define CURR_$define[ 	][ 	]*\([^ 	][^ 	]*\)/\1/p" $file`
+    [ "$curr" == "$sum" ] || echo "*** WARNING WARNING WARNING WARNING WARNING ***
+*** $file: magic number changed old $curr != new $sum
+*** WARNING WARNING WARNING WARNING WARNING ***" 1>&2
+done >> $file_magic
+exit 0