When a macro is replaced by the preprocessor, pgc.l reaches a end of

file, which is not the actual end of the file. One side effect of that
is that if you are i n a ifdef block, you get a wrong error telling you
that a endif is missing.

This patch corrects pgc.l and also adds a test of this problem to
test1.pgc. To  convince you apply the patch to test1.pgc first then try
to compile the test the n apply the patch to pgc.l.

The patch moves the test of the scope of an ifdef block to the end of
the file b eeing parsed, including all includes files, ... .

Nicolas Bazin