On 20.08.21 02:21, H.J. Lu wrote:
> This may have broken bootstrap on 32-bit hosts:
> https://gcc.gnu.org/pipermail/gcc-regression/2021-August/075209.html
The latter has:
> ../../src-master/gcc/fortran/simplify.c:4557:22: error: unknown conversion type character ‘l’ in format [-Werror=format=]
>   4557 |           gfc_error ("Substring start index (" HOST_WIDE_INT_PRINT_DEC
>        |                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

HOST_WIDE_INT_PRINT_DEC is:
   #define HOST_WIDE_INT_PRINT_DEC "%" PRId64
and the latter is something like:
   "ld"  or "lld"

I fail to see why that shouldn't work – and also building with:

  CC="gcc-10 -m32 -fno-lto -O2" CXX="g++-10 -m32 -fno-lto -O2" .../configure --prefix=... --disable-multilib --disable-libstdcxx-pch --enable-multiarch --enable-languages=c,c++,fortran --disable-lto

did succeed.


Looking at the format checking:
   gfortran.h:void gfc_error (const char *, ...) ATTRIBUTE_GCC_GFC(1,2);
with
   gfortran.h:#define ATTRIBUTE_GCC_GFC(m, n) __attribute__ ((__format__ (__gcc_gfc__, m, n))) ATTRIBUTE_NONNULL(m)

I do see that the C/C++ part (which also uses
HOST_WIDE_INT_PRINT_DEC) have some special code
for HWI, which is used for via
    init_dynamic_diag_info
contains support for hwi not for gfc_{error,warning} via
    init_dynamic_gfc_info

I did wonder whether that causes the differences (→ attached patch).
On the other hand, %ld and %lld are pretty standard – and the
comment in the function talks about %w – which is not used
(except in spec files and in 'go').

Hence: No idea what's the problem or goes wrong.

Maybe the patch is still useful – at least it gives an
error when HWI is neither long nor long long ...
(Build with and without that patch with the options
shown aboved (and 'error:' in stage 1, 2, 3 plus
the usual bootstrap on x86-64.)

Comments?

Tobias

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