mirror of
https://gcc.gnu.org/git/gcc.git
synced 2026-02-22 03:46:53 -05:00
b1696ffd46
There are 100+ regressions when running the g++ testsuite for newlib
targets (probably excepting ARM-based ones) e.g cris-elf after commit
r15-3859-g63a598deb0c9fc "libstdc++: #ifdef out #pragma GCC
system_header", which effectively no longer silences warnings for
gcc-installed system headers. Some of these regressions are fixed by
r15-3928. For the remaining ones, there's in g++.log:
FAIL: g++.old-deja/g++.robertl/eb79.C -std=c++26 (test for excess errors)
Excess errors:
/gccobj/cris-elf/libstdc++-v3/include/cris-elf/bits/ctype_base.h:50:53: \
warning: overflow in conversion from 'int' to 'std::ctype_base::mask' \
{aka 'char'} changes value from '151' to '-105' [-Woverflow]
This is because the _B macro in newlib's ctype.h (from where the
"_<letter>" macros come) is bit 7, the sign-bit of 8-bit types:
#define _B 0200
Using it in an int-expression that is then truncated to 8 bits will
"change" the value to negative for a default-signed char. If this
code was created from scratch, it should have been an unsigned type,
however it's not advisable to change the type of mask as this affects
the API. The least ugly option seems to be to silence the warning by
explict casts in the initializer, and for consistency, doing it for
all members.
PR libstdc++/116895
* config/os/newlib/ctype_base.h: Avoid signed-overflow warnings by
explicitly casting initializer expressions to mask.
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.