https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100654
Bug ID: 100654
Summary: trunk bootstrap errors with -O0 and -O1
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: manfred99 at gmx dot ch
Target Milestone: ---
linux x86_64 and i686 (GCC 7.5 as bootstrap compiler), with BOOT_CFLAGS="-O0
-g":
../../gcc-trunk-source/gcc/gcc/opts.c: In function 'void
print_filtered_help(unsigned int, unsigned int, unsigned int, unsigned int,
gcc_options*, unsigned int)':
../../gcc-trunk-source/gcc/gcc/opts.c:1406:26: error: ' ' directive output may
be truncated writing 2 bytes into a region of size between 1 and 256
[-Werror=format-truncation=]
1406 | "%s %s", help, _(use_diagnosed_msg));
| ^~
../../gcc-trunk-source/gcc/gcc/opts.c:1405:22: note: 'snprintf' output 3 or
more bytes (assuming 258) into a destination of size 256
1405 | snprintf (new_help, sizeof new_help,
| ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
1406 | "%s %s", help, _(use_diagnosed_msg));
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
last successful bootstrap for my daily builds with "-O0" was
99e8df7a4cc0bb1bfa49e69ccb0f7e02c9755e3c (2021-05-05).
with BOOT_CFLAGS="-O1 -g":
../../gcc-trunk-source/gcc/gcc/gimplify.c: In function 'gimplify_status
gimplify_omp_loop(tree_node**, gimple**)':
../../gcc-trunk-source/gcc/gcc/gimplify.c:12967:17: error: 'last' may be used
uninitialized in this function [-Werror=maybe-uninitialized]
12967 | if (pass != last)
| ^~
trunk builds fine with "-O2" however.
