From: "Andrew Fish" <afish@apple.com>
To: edk2-devel-groups-io <devel@edk2.groups.io>, bob.c.feng@intel.com
Cc: "leif@nuviainc.com" <leif@nuviainc.com>,
PierreGondois <pierre.gondois@arm.com>,
"Gao, Liming" <liming.gao@intel.com>,
"tomas@nuviainc.com" <tomas@nuviainc.com>
Subject: Re: [edk2-devel] [PATCH V2 1/2] BaseTools: Add gcc flag to warn on void* pointer arithmetic
Date: Wed, 22 Jul 2020 19:49:01 -0700 [thread overview]
Message-ID: <EF42DD5B-80D0-4230-81A1-EB29F970558A@apple.com> (raw)
In-Reply-To: <BN6PR11MB006878E6678787F96F2A67EAC9760@BN6PR11MB0068.namprd11.prod.outlook.com>
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Bob,
It also looks like clang could use this flag as the default seems to be to follow the GCC behavior.
Thanks,
Andrew Fish
> On Jul 22, 2020, at 6:56 PM, Bob Feng <bob.c.feng@intel.com> wrote:
>
> Hi Leif
>
> I agree to revert that patch for now and I sent a revert patch for review. After resolving the build break issue for ARM/AARCH64 platforms in edk2-platforms, and make sure there is no platform build break with this patch, we will push it again.
>
> Thanks,
> Bob
>
> -----Original Message-----
> From: devel@edk2.groups.io <mailto:devel@edk2.groups.io> <devel@edk2.groups.io <mailto:devel@edk2.groups.io>> On Behalf Of Leif Lindholm
> Sent: Thursday, July 23, 2020 2:06 AM
> To: devel@edk2.groups.io <mailto:devel@edk2.groups.io>; Feng, Bob C <bob.c.feng@intel.com <mailto:bob.c.feng@intel.com>>
> Cc: PierreGondois <pierre.gondois@arm.com <mailto:pierre.gondois@arm.com>>; Gao, Liming <liming.gao@intel.com <mailto:liming.gao@intel.com>>; tomas@nuviainc.com <mailto:tomas@nuviainc.com>
> Subject: Re: [edk2-devel] [PATCH V2 1/2] BaseTools: Add gcc flag to warn on void* pointer arithmetic
>
> Hi Bob,
>
> This patch also breaks about half of the ARM/AARCH64 platforms in edk2-platforms. I agree it should go in at a later stage, but for now, can we please revert it?
>
> Regards,
>
> Leif
>
> On Mon, Jul 20, 2020 at 04:10:27 +0000, Bob Feng wrote:
>> Reviewed-by: Bob Feng<bob.c.feng@intel.com>
>>
>>
>> -----Original Message-----
>> From: PierreGondois <pierre.gondois@arm.com>
>> Sent: Tuesday, July 7, 2020 4:35 PM
>> To: devel@edk2.groups.io
>> Cc: Pierre Gondois <Pierre.Gondois@arm.com>; Feng, Bob C
>> <bob.c.feng@intel.com>; Gao, Liming <liming.gao@intel.com>;
>> tomas.pilar@arm.com; nd@arm.com
>> Subject: [PATCH V2 1/2] BaseTools: Add gcc flag to warn on void*
>> pointer arithmetic
>>
>> From: Pierre Gondois <pierre.gondois@arm.com>
>>
>> By default, gcc allows void* pointer arithmetic.
>> This is a GCC extension.
>> However:
>> - the C reference manual states that void*
>> pointer "cannot be operands of addition
>> or subtraction operators". Cf s5.3.1
>> "Generic Pointers";
>> - Visual studio compiler treat such operation as
>> an error.
>>
>> To prevent such pointer arithmetic, the "-Wpointer-arith"
>> flag should be set for all GCC versions.
>>
>> The "-Wpointer-arith" allows to:
>> "Warn about anything that depends on the "size of"
>> a function type or of void. GNU C assigns these
>> types a size of 1, for convenience in calculations
>> with void * pointers and pointers to functions."
>>
>> This flag is available since GCC2.95.3 which came out in 2001.
>>
>> Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
>> ---
>>
>> The changes can be seen at:
>> https://github.com/PierreARM/edk2/commits/831_Add_gcc_flag_warning_v2
>>
>> Notes:
>> v1:
>> - Add "-Wpointer-arith" gcc flag. [Pierre]
>> v2:
>> - Only add the flag for ARM and AARCH64. [Tomas]
>>
>> BaseTools/Conf/tools_def.template | 6 +++---
>> 1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/BaseTools/Conf/tools_def.template
>> b/BaseTools/Conf/tools_def.template
>> index
>> 8aeb8a2a6417e41c5660cda5066f52adc8cc3089..397b011ba38f97f81f314f8641ac
>> 8bb95d5a2197 100755
>> --- a/BaseTools/Conf/tools_def.template
>> +++ b/BaseTools/Conf/tools_def.template
>> @@ -1,7 +1,7 @@
>> #
>> # Copyright (c) 2006 - 2018, Intel Corporation. All rights
>> reserved.<BR> # Portions copyright (c) 2008 - 2009, Apple Inc. All
>> rights reserved.<BR> -# Portions copyright (c) 2011 - 2019, ARM Ltd.
>> All rights reserved.<BR>
>> +# Portions copyright (c) 2011 - 2020, ARM Ltd. All rights
>> +reserved.<BR>
>> # Copyright (c) 2015, Hewlett-Packard Development Company, L.P.<BR> # (C) Copyright 2020, Hewlett Packard Enterprise Development LP<BR> # Copyright (c) Microsoft Corporation
>> @@ -1921,9 +1921,9 @@ NOOPT_*_*_OBJCOPY_ADDDEBUGFLAG = --add-gnu-debuglink=$(DEBUG_DIR)/$(MODULE_N
>> DEFINE GCC_ALL_CC_FLAGS = -g -Os -fshort-wchar -fno-builtin -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -include AutoGen.h -fno-common
>> DEFINE GCC_IA32_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -m32 -malign-double -freorder-blocks -freorder-blocks-and-partition -O2 -mno-stack-arg-probe
>> DEFINE GCC_X64_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -mno-red-zone -Wno-address -mno-stack-arg-probe
>> -DEFINE GCC_ARM_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -mlittle-endian -mabi=aapcs -fno-short-enums -funsigned-char -ffunction-sections -fdata-sections -fomit-frame-pointer -Wno-address -mthumb -mfloat-abi=soft -fno-pic -fno-pie
>> +DEFINE GCC_ARM_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -Wpointer-arith -mlittle-endian -mabi=aapcs -fno-short-enums -funsigned-char -ffunction-sections -fdata-sections -fomit-frame-pointer -Wno-address -mthumb -mfloat-abi=soft -fno-pic -fno-pie
>> DEFINE GCC_ARM_CC_XIPFLAGS = -mno-unaligned-access
>> -DEFINE GCC_AARCH64_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -mlittle-endian -fno-short-enums -fverbose-asm -funsigned-char -ffunction-sections -fdata-sections -Wno-address -fno-asynchronous-unwind-tables -fno-unwind-tables -fno-pic -fno-pie -ffixed-x18
>> +DEFINE GCC_AARCH64_CC_FLAGS = DEF(GCC_ALL_CC_FLAGS) -Wpointer-arith -mlittle-endian -fno-short-enums -fverbose-asm -funsigned-char -ffunction-sections -fdata-sections -Wno-address -fno-asynchronous-unwind-tables -fno-unwind-tables -fno-pic -fno-pie -ffixed-x18
>> DEFINE GCC_AARCH64_CC_XIPFLAGS = -mstrict-align -mgeneral-regs-only
>> DEFINE GCC_DLINK_FLAGS_COMMON = -nostdlib --pie
>> DEFINE GCC_DLINK2_FLAGS_COMMON = -Wl,--script=$(EDK_TOOLS_PATH)/Scripts/GccBase.lds
>> --
>> 'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'
>>
>>
>>
>>
>
>
>
>
>
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next prev parent reply other threads:[~2020-07-23 2:49 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-07 8:35 [PATCH V2 0/2] Add gcc flag for void* pointer arithmetics PierreGondois
2020-07-07 8:35 ` [PATCH V2 1/2] BaseTools: Add gcc flag to warn on void* pointer arithmetic PierreGondois
2020-07-16 9:07 ` [edk2-devel] " Yuwei Chen
2020-07-20 4:10 ` Bob Feng
2020-07-22 18:05 ` [edk2-devel] " Leif Lindholm
2020-07-22 21:13 ` Andrew Fish
2020-07-23 1:56 ` Bob Feng
2020-07-23 2:49 ` Andrew Fish [this message]
2020-07-23 9:33 ` Leif Lindholm
2020-07-24 3:56 ` Bob Feng
2020-07-24 9:01 ` PierreGondois
2020-07-24 11:05 ` Leif Lindholm
2020-07-24 11:03 ` Leif Lindholm
2020-07-07 8:35 ` [PATCH V2 2/2] BaseTools: Factorize GCC flags PierreGondois
2020-07-20 4:11 ` Bob Feng
2020-07-30 12:08 ` [edk2-devel] " Leif Lindholm
2020-07-22 11:03 ` Laszlo Ersek
2020-07-22 11:24 ` Laszlo Ersek
2020-08-26 16:42 ` Laszlo Ersek
2020-08-27 8:32 ` PierreGondois
2020-08-27 14:55 ` Laszlo Ersek
2020-08-27 15:25 ` Leif Lindholm
2020-08-28 16:56 ` Laszlo Ersek
2020-08-28 19:15 ` Leif Lindholm
2020-08-31 13:22 ` Ard Biesheuvel
2020-08-31 13:43 ` 回复: " gaoliming
2020-08-31 14:03 ` Laszlo Ersek
2020-08-31 14:37 ` Ard Biesheuvel
2020-08-31 16:18 ` Laszlo Ersek
2020-08-31 16:27 ` Laszlo Ersek
2020-08-31 17:14 ` Ard Biesheuvel
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