define_constants and tm.h

[Bernd Jendrissek <berndj at prism dot co dot za>]

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I'm (very) lazily working on a port to 16-bit x86, and I had been using
define_constants values throughout my target header (tm.h - really
i86.h), but since a few months ago I haven't been able to build GCC as
insn-constants.h isn't yet available by the time tm.h gets included.

In fact, now it seems like a circular dependency (???):

make: Entering directory `/mnt/disk2/src/gcc-i86/gcc'
gcc -c   -g -DIN_GCC -DCROSS_COMPILE  -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -fno-common   -DHAVE_CONFIG_H -DGENERATOR_FILE    -I. -Ibuild -I/mnt/disk2/src/gcc/gcc -I/mnt/disk2/src/gcc/gcc/build -I/mnt/disk2/src/gcc/gcc/../include -I/mnt/disk2/src/gcc/gcc/../libcpp/include  \
 -o build/rtl.o /mnt/disk2/src/gcc/gcc/rtl.c
/mnt/disk2/src/gcc/gcc/rtl.c:33:28: insn-constants.h: No such file or directory
/mnt/disk2/src/gcc/gcc/rtl.c: In function `copy_rtx':
/mnt/disk2/src/gcc/gcc/rtl.c:225: error: `FLAGS_REG' undeclared (first use in this function)
/mnt/disk2/src/gcc/gcc/rtl.c:225: error: (Each undeclared identifier is reported only once
/mnt/disk2/src/gcc/gcc/rtl.c:225: error: for each function it appears in.)
make: *** [build/rtl.o] Error 1
make: Leaving directory `/mnt/disk2/src/gcc-i86/gcc'

Indeed, looking throught the makefile reveals that genconstants depends
on $(BUILD_RTL), which in turn depends on rtl.c, which in turn
#include's both tm.h and insn-constants.h!

Is there something I don't understand?

Oh, and how the hell are the other ports using define_constants building
genconstants if there really is a circular dependency?

bernd
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