Re: Fix cross-builds broken from C++-creep

[Richard Guenther <richard dot guenther at gmail dot com>]

On Tue, Jan 3, 2012 at 5:53 AM, Hans-Peter Nilsson
<hans-peter.nilsson@axis.com> wrote:
> All cross-builds are "still" done as C. ?In C++ you don't need
> the missing struct qualifier or the typedef in "typedef struct
> gfc_expr ... gfc_expr;" (the struct declaration suffices) as
> there's no separate struct namespace IIUC.
>
> Doesn't this show a bug in the compatibility warning system, or
> is that turned off when bootstrapping as C++?

It only works the other way around - warn for C when a construct
is not compatible with C++.  Thus it won't ever catch issues in
frontends that are not compiled in stage1.

Richard.

>
> Anyway, committed as obvious after a cris-elf build has passed
> the point of failure, which looked as follows (first five lines
> of errors).
>
> ...
> gcc -c ?-DIN_GCC_FRONTEND -g -O2 -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE ?-W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Wold-style-definition -Wc++-compat -fno-common ?-DHAVE_CONFIG_H -I. -Ifortran -I/tmp/fail0102-96/gcc/gcc -I/tmp/fail0102-96/gcc/gcc/fortran -I/tmp/fail0102-96/gcc/gcc/../include -I/tmp/fail0102-96/gcc/gcc/../libcpp/include -I/tmp/fail0102-96/gccobj/./gmp -I/tmp/fail0102-96/gcc/gmp -I/tmp/fail0102-96/gccobj/./mpfr -I/tmp/fail0102-96/gcc/mpfr -I/tmp/fail0102-96/gcc/mpc/src ?-I/tmp/fail0102-96/gcc/gcc/../libdecnumber -I/tmp/fail0102-96/gcc/gcc/../libdecnumber/dpd -I../libdecnumber ? ?/tmp/fail0102-96/gcc/gcc/fortran/arith.c -o fortran/arith.o
> In file included from /tmp/fail0102-96/gcc/gcc/fortran/arith.c:31:
> /tmp/fail0102-96/gcc/gcc/fortran/gfortran.h:1702: error: expected specifier-qualifier-list before 'gfc_expr'
> /tmp/fail0102-96/gcc/gcc/fortran/arith.c: In function 'gfc_arith_not':
> /tmp/fail0102-96/gcc/gcc/fortran/arith.c:418: error: 'gfc_expr' has no member named 'value'
> /tmp/fail0102-96/gcc/gcc/fortran/arith.c:418: error: 'gfc_expr' has no member named 'value'
> /tmp/fail0102-96/gcc/gcc/fortran/arith.c: In function 'gfc_arith_and':
> /tmp/fail0102-96/gcc/gcc/fortran/arith.c:432: error: 'gfc_expr' has no member named 'value'
> /tmp/fail0102-96/gcc/gcc/fortran/arith.c:432: error: 'gfc_expr' has no member named 'value'
>
> fortran:
> ? ? ? ?* gfortran.h (struct gfc_expr): Add missing "struct"
> ? ? ? ?qualifier for member base_expr.
>
> Index: gcc/fortran/gfortran.h
> ===================================================================
> --- gcc/fortran/gfortran.h ? ? ?(revision 182825)
> +++ gcc/fortran/gfortran.h ? ? ?(working copy)
> @@ -1699,7 +1699,7 @@ typedef struct gfc_expr
>
> ? /* Used to store the base expression in component calls, when the expression
> ? ? ?is not a variable. ?*/
> - ?gfc_expr *base_expr;
> + ?struct gfc_expr *base_expr;
>
> ? /* is_boz is true if the integer is regarded as BOZ bitpatten and is_snan
> ? ? ?denotes a signalling not-a-number. ?*/
>
> brgds, H-P