On Tue, 12 Jul 2011, Rainer Orth wrote: > Only a couple of special defines (like FLOAT_WORD_ORDER_MISMATCH, > QUIET_NAN_NEGATED) are moved to special t-* files in libgcc/config with > [FDT]PBIT_CFLAGS similar to e.g. LIBGCC_SYNC_CFLAGS. If it were > possible to have gcc define some __LIBGCC_* macro corresponding to them, > that would allow for further simplification. Only if this mechanism > couldn't handle the requirements have I resorted to introducing > libgcc_tm_file snippets to handle them.
I *think*, based on how it's used, that FLOAT_WORD_ORDER_MISMATCH is intended to describe cases where BYTES_BIG_ENDIAN and FLOAT_WORDS_BIG_ENDIAN disagree. (I say BYTES_BIG_ENDIAN not WORDS_BIG_ENDIAN only on the basis that pdp11 doesn't use FLOAT_WORD_ORDER_MISMATCH.) That is, certain legacy ARM targets using FPA floating-point format. The information for QUIET_NAN_NEGATED is in the qnan_msb_set field of struct real_format, I suppose. > diff --git a/gcc/config/mips/t-linux64 b/gcc/config/mips/t-linux64 > --- a/gcc/config/mips/t-linux64 > +++ b/gcc/config/mips/t-linux64 > @@ -1,4 +1,4 @@ > -# Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc. > +# Copyright (C) 2003, 2004, 2005, 2006, 2011 Free Software Foundation, Inc. > # > # This file is part of GCC. > # > @@ -21,15 +21,3 @@ MULTILIB_DIRNAMES = n32 32 64 > MULTILIB_OSDIRNAMES = ../lib32 ../lib ../lib64 > > EXTRA_MULTILIB_PARTS=crtbegin.o crtend.o crtbeginS.o crtendS.o crtbeginT.o > - > -TPBIT = tp-bit.c > - > -tp-bit.c: $(srcdir)/config/fp-bit.c > - echo '#ifdef __MIPSEL__' > tp-bit.c > - echo '# define FLOAT_BIT_ORDER_MISMATCH' >> tp-bit.c > - echo '#endif' >> tp-bit.c > - echo '#if __LDBL_MANT_DIG__ == 113' >> tp-bit.c > - echo '#define QUIET_NAN_NEGATED' >> tp-bit.c > - echo '# define TFLOAT' >> tp-bit.c > - cat $(srcdir)/config/fp-bit.c >> tp-bit.c > - echo '#endif' >> tp-bit.c How does your code replace the "#if __LDBL_MANT_DIG__ == 113" condition that stops tp-bit.c being built for o32 multilibs that don't have TFmode? (The best way would I think be configure tests in libgcc that cause tp-bit.c only to be built at all for the relevant multilibs for this target.) -- Joseph S. Myers jos...@codesourcery.com
