[Bug pch/19541] deprecation of -I- makes precompiled headers less usable

[Ralf dot Wildenhues at gmx dot de]

------- Additional Comments From Ralf dot Wildenhues at gmx dot de  2005-01-20 15:47 -------
mkdir src build
echo 'extern int foo;' > src/foo.h
echo >src/bar.c '#include "foo.h"
int bar(void) { return foo; }'
cd build
gcc -o foo.h.gch ../src/foo.h
gcc -H -c ../src/bar.c

This will not use the gch in the current directory,
unless I also specify `-I. -I-'.

Putting the pch under the source tree works against all VPATH build
principles (read-only source tree).  It does not matter whether I
use a directory build/foo.h.gch/ or a file.

(The other bug I reported was indeed false, apologies for the
reading disability that struck me there.)

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19541