[Bug bootstrap/12974] [3.4/3.5 Regression] gcc-3.4/3.5-20031105 bootstrap failure [MinGW]

[dannysmith at gcc dot gnu dot org]

------- Additional Comments From dannysmith at gcc dot gnu dot org  2004-02-19 01:50 -------
The relevant part of the gcc makefile is this:

in 3.4

INCLUDES = -I. -I$(@D) -I$(srcdir) -I$(srcdir)/$(@D) \
	   -I$(srcdir)/../include 


in 3.3

INCLUDES = -I. -I$(@D) -I$(srcdir) -I$(srcdir)/$(@D) \
	   -I$(srcdir)/config -I$(srcdir)/../include

How does  msys version of make expand @D automatic variable,
when the target filename is of the form libgcc/./_muldi3.o

  -I$(@D) -I$(srcdir)

may cause problems if it is interpreted as  -I -I$(srcdir). 
(which is what your output seems to suggest)

The search will be for a nonexistent directory named -I$(srcdir)
rather than two directories: -Ilibgcc -I$(srcdir) 

In 3.3 the include of -I$(srcdir)/config would have allowed it to find 
config/i386/ regardless of handling of @D.

Can you add -v to TARGET_LIBGCC2_CFLAGS to see what directories are being 
searched.

Danny

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12974