On 20/09/16 15:11, Bernd Edlinger wrote:
On 09/20/16 13:29, Kyrill Tkachov wrote:
arm bootstrap is now failing:
$SRC/gcc/config/arm/arm.h:2229:40: error: ?: using integer constants in
boolean context [-Werror=int-in-bool-context]
: (TARGET_VFP_DOUBLE ? (TARGET_FP16 ? 14 : 12) : 0)) \
~~~~~~~~~~~~~^~~~~~~~~~
$SRC/gcc/config/arm/arm-c.c:133:7: note: in expansion of macro
'TARGET_ARM_FP'
if (TARGET_ARM_FP)
The full definition of TARGET_ARM_FP is:
#define TARGET_ARM_FP \
(!TARGET_SOFT_FLOAT ? (TARGET_VFP_SINGLE ? 4 \
: (TARGET_VFP_DOUBLE ? (TARGET_FP16 ? 14 : 12) : 0)) \
: 0)
We want it set to 0 when there's no FP but when FP is available we set
it to a bitmask
to suggest the level that is available. That seems like a legitimate use
to me.
Ok, I see, sorry for that.
I think I will have to suppress the warning if the conditional is in
a macro somehow.
Can you work around that for a few days?
I changed to:
if (TARGET_ARM_FP != 0)
in my tree to allow the build to proceed but encountered another bootstrap
failure:
In file included from ./tm.h:38:0,
from $SRC/gcc/backend.h:28,
from $SRC/gcc/regrename.c:23:
$SRC/gcc/regrename.c: In function 'void rename_chains()':
$SRC/gcc/config/arm/arm.h:915:4: error: ?: using integer constants in boolean
context [-Werror=int-in-bool-context]
(TARGET_ARM \
~~~~~~~~~~~~~~~~~
? ARM_HARD_FRAME_POINTER_REGNUM \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
: THUMB_HARD_FRAME_POINTER_REGNUM)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
$SRC/gcc/regrename.c:484:8: note: in expansion of macro
'HARD_FRAME_POINTER_REGNUM'
|| (HARD_FRAME_POINTER_REGNUM && frame_pointer_needed
^~~~~~~~~~~~~~~~~~~~~~~~~
That looks like a legitimate bug in regrename.c ?
The full condition is:
if (fixed_regs[reg] || global_regs[reg]
|| (!HARD_FRAME_POINTER_IS_FRAME_POINTER && frame_pointer_needed
&& reg == HARD_FRAME_POINTER_REGNUM)
|| (HARD_FRAME_POINTER_REGNUM && frame_pointer_needed
&& reg == FRAME_POINTER_REGNUM))
The condition in the second || looks bogus (what use testing if a register is
'non-zero').
So this looks like a useful catch by the warning, though I'm not sure at first
glance how
to fix it.
Kyrill
Bernd.
