https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77753
Bug ID: 77753
Summary: [7 Regression] broken profiledbootstrap due to
-Werror=format-length in varasm.c:1573
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
Target Milestone: ---
Running profiledbootstrap on a ppc64le machine:
../../gcc/varasm.c: In function ‘void
default_named_section_asm_out_destructor(rtx, int)’:
../../gcc/varasm.c:1573:1: error: ‘%.5u’ directive writing between 5 and 10
bytes into a region of size 9 [-Werror=format-length=]
default_named_section_asm_out_destructor (rtx symbol, int priority)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../gcc/varasm.c:1573:1: note: directive argument in the range [-2147418112,
2147483647]
../../gcc/varasm.c:1568:7: note: format output between 13 and 18 bytes into a
destination of size 16
p);
^
../../gcc/varasm.c: In function ‘void
default_named_section_asm_out_constructor(rtx, int)’:
../../gcc/varasm.c:1596:1: error: ‘%.5u’ directive writing between 5 and 10
bytes into a region of size 9 [-Werror=format-length=]
default_named_section_asm_out_constructor (rtx symbol, int priority)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../gcc/varasm.c:1596:1: note: directive argument in the range [-2147418112,
2147483647]
../../gcc/varasm.c:1568:7: note: format output between 13 and 18 bytes into a
destination of size 16
p);
code snippet:
char buf[16];
/* ??? This only works reliably with the GNU linker. */
sprintf (buf, "%s.%.5u",
constructor_p ? ".ctors" : ".dtors",
/* Invert the numbering so the linker puts us in the proper
order; constructors are run from right to left, and the
linker sorts in increasing order. */
MAX_INIT_PRIORITY - priority);
I'm wondering whether "%.5u" format (limiting output to 5 digits) is really
supported by sprintf?
If not, I guess we should either increase buffer size. Can sprintf format check
utilize VRP information?
