MSVC: Rebuild spiexceptions.h when out of date.

Also, add a warning to catch future instances of naming a nonexistent
file as a prerequisite.  Back-patch to 9.3 (all supported versions).

diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 947d9042446a0b20136d0332727ee0c41e5417ed..6dcdd29f576ed4f535feadfac51011941b415aa4 100644 (file)
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -81,6 +81,7 @@ sub DeterminePlatform
 sub IsNewer
 {
    my ($newfile, $oldfile) = @_;
+   -e $oldfile or warn "source file \"$oldfile\" does not exist";
    if (   $oldfile ne 'src/tools/msvc/config.pl'
        && $oldfile ne 'src/tools/msvc/config_default.pl')
    {
@@ -325,7 +326,7 @@ s{PG_VERSION_STR "[^"]+"}{PG_VERSION_STR "PostgreSQL $self->{strver}$extraver, c
    if ($self->{options}->{python}
        && IsNewer(
            'src/pl/plpython/spiexceptions.h',
-           'src/include/backend/errcodes.txt'))
+           'src/backend/utils/errcodes.txt'))
    {
        print "Generating spiexceptions.h...\n";
        system(