[Bug fortran/42954] [4.5 regression] TARGET_*_CPP_BUILDINS issues with gfortran

[fxcoudert at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42954

--- Comment #7 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> 2010-09-26 13:44:10 UTC ---
After some auditing: TARGET_OBJFMT_CPP_BUILTINS is safe (it's only called in
config/elfos.h and config/alpha/elf.h, and contains a single, unconditionnal
call to builtin_define()).

Regarding TARGET_OS_CPP_BUILTINS, definitions in the following files may not be
safe for the Fortran front-end:

alpha/linux.h: c_dialect_cxx
alpha/osf5.h: c_dialect_cxx
arm/vxworks.h: arm_arch_xscale, arm_arch5, arm_arch4, thumb_code
cris/linux.h: flag_leading_underscore
i386/cygming.h: flag_iso
i386/darwin.h: darwin_cpp_builtins
i386/i386-interix.h: preprocessing_asm_p, c_dialect_cxx, c_dialect_objc
i386/netware.h: flag_iso
ia64/hpux.h: c_dialect_cxx, flag_iso
mips/iris6.h: flag_isoc99, c_dialect_cxx, flag_iso
mips/linux.h: c_dialect_cxx
mips/netbsd.h: mips_abi
pa/pa-hpux.h: c_dialect_cxx, flag_iso, preprocessing_trad_p
pa/pa-hpux10.h: c_dialect_cxx, flag_iso, preprocessing_trad_p, flag_pa_unix
pa/pa-hpux11.h: c_dialect_cxx, flag_iso, preprocessing_trad_p, flag_pa_unix,
flag_isoc94, flag_isoc99, 
pa/pa.h: c_dialect_cxx, flag_iso
rs6000/darwin.h: darwin_cpp_builtins
rs6000/sysv4.h: target_flags_explicit
sol2.h: c_dialect_cxx

(each time, I give the list of variables/functions which may not be accessible
from the Fortran front-end). One thing we could do is wrap all that with some
IS_INSIDE_C_FAMILY_FRONTEND macro, so that it's just protected in Fortran and
potentially other languages. Or we double the work and split
TARGET_OS_CPP_BUILTINS into TARGET_OS_CPP_CFAMILY_BUILTINS and
TARGET_OS_CPP_OTHERLANG_BUILTINS (you get the idea).


I still have to audit TARGET_CPU_CPP_BUILTINS, but I'm running out of time for
today.