Re: [PATCH] BaseTools/tools_def AARCH64: enable frame pointers for RELEASE builds

["Gao, Liming" <liming.gao@intel.com>]

Reviewed-by: Liming Gao <liming.gao@intel.com>

>-----Original Message-----
>From: Leif Lindholm [mailto:leif.lindholm@linaro.org]
>Sent: Saturday, September 16, 2017 3:34 PM
>To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>Cc: edk2-devel@lists.01.org; Gao, Liming <liming.gao@intel.com>; Zhu,
>Yonghong <yonghong.zhu@intel.com>
>Subject: Re: [PATCH] BaseTools/tools_def AARCH64: enable frame pointers
>for RELEASE builds
>
>On Fri, Sep 15, 2017 at 04:13:56PM -0700, Ard Biesheuvel wrote:
>> Commit 8f0b62a5dac0 ("BaseTools/tools_def AARCH64: enable frame
>pointers
>> for DEBUG builds") removed the -fomit-frame-pointer switch from the
>> shared CFLAGS between AARCH64 DEBUG and RELEASE build, and move it
>to
>> the RELEASE specific ones, so that DEBUG builds can produce a backtrace
>> when a crash occurs.
>>
>> This is actually a useful thing to have for RELEASE builds as well.
>> AArch64 has 30 general purpose registers, and so the performance hit of
>> having a frame pointer is unlikely to be noticeable, nor are the
>> additional 8 bytes of stack space likely to present a problem.
>>
>> So remove -fomit-frame-pointer altogether this time.
>>
>> Contributed-under: TianoCore Contribution Agreement 1.1
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>
>Looks sensible.
>Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
>
>/
>    Leif
>
>> ---
>>  BaseTools/Conf/tools_def.template | 10 +++++-----
>>  1 file changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/BaseTools/Conf/tools_def.template
>b/BaseTools/Conf/tools_def.template
>> index cbb5024c1bd3..e93c2a0bf1ef 100755
>> --- a/BaseTools/Conf/tools_def.template
>> +++ b/BaseTools/Conf/tools_def.template
>> @@ -4990,7 +4990,7 @@ RELEASE_GCC47_ARM_CC_FLAGS       =
>DEF(GCC47_ARM_CC_FLAGS) -Wno-unused-but-set-v
>>  *_GCC47_AARCH64_CC_XIPFLAGS      =
>DEF(GCC47_AARCH64_CC_XIPFLAGS)
>>
>>    DEBUG_GCC47_AARCH64_CC_FLAGS   = DEF(GCC47_AARCH64_CC_FLAGS)
>-O0
>> -RELEASE_GCC47_AARCH64_CC_FLAGS   = DEF(GCC47_AARCH64_CC_FLAGS)
>-Wno-unused-but-set-variable -fomit-frame-pointer
>> +RELEASE_GCC47_AARCH64_CC_FLAGS   =
>DEF(GCC47_AARCH64_CC_FLAGS) -Wno-unused-but-set-variable
>>    NOOPT_GCC47_AARCH64_CC_FLAGS   = DEF(GCC47_AARCH64_CC_FLAGS)
>-O0
>>
>>
>###########################################################
>#########################
>> @@ -5130,7 +5130,7 @@ RELEASE_GCC48_ARM_CC_FLAGS       =
>DEF(GCC48_ARM_CC_FLAGS) -Wno-unused-but-set-v
>>  *_GCC48_AARCH64_CC_XIPFLAGS      =
>DEF(GCC48_AARCH64_CC_XIPFLAGS)
>>
>>    DEBUG_GCC48_AARCH64_CC_FLAGS   = DEF(GCC48_AARCH64_CC_FLAGS)
>-O0
>> -RELEASE_GCC48_AARCH64_CC_FLAGS   = DEF(GCC48_AARCH64_CC_FLAGS)
>-Wno-unused-but-set-variable -fomit-frame-pointer
>> +RELEASE_GCC48_AARCH64_CC_FLAGS   =
>DEF(GCC48_AARCH64_CC_FLAGS) -Wno-unused-but-set-variable
>>    NOOPT_GCC48_AARCH64_CC_FLAGS   = DEF(GCC48_AARCH64_CC_FLAGS)
>-O0
>>
>>
>###########################################################
>#########################
>> @@ -5272,7 +5272,7 @@ RELEASE_GCC49_ARM_CC_FLAGS       =
>DEF(GCC49_ARM_CC_FLAGS) -Wno-unused-but-set-v
>>    DEBUG_GCC49_AARCH64_DLINK_FLAGS  =
>DEF(GCC49_AARCH64_DLINK_FLAGS) -z common-page-size=0x1000
>>    DEBUG_GCC49_AARCH64_DLINK_XIPFLAGS = -z common-page-size=0x20
>>
>> -RELEASE_GCC49_AARCH64_CC_FLAGS     =
>DEF(GCC49_AARCH64_CC_FLAGS) -Wno-unused-but-set-variable -Wno-
>unused-const-variable -mcmodel=tiny -fomit-frame-pointer
>> +RELEASE_GCC49_AARCH64_CC_FLAGS     =
>DEF(GCC49_AARCH64_CC_FLAGS) -Wno-unused-but-set-variable -Wno-
>unused-const-variable -mcmodel=tiny
>>  RELEASE_GCC49_AARCH64_DLINK_FLAGS  =
>DEF(GCC49_AARCH64_DLINK_FLAGS)
>>
>>    NOOPT_GCC49_AARCH64_CC_FLAGS     =
>DEF(GCC49_AARCH64_CC_FLAGS) -O0 -mcmodel=small
>> @@ -5428,7 +5428,7 @@ RELEASE_GCC5_ARM_DLINK_FLAGS     =
>DEF(GCC5_ARM_DLINK_FLAGS) -flto -Os -L$(WORKS
>>    DEBUG_GCC5_AARCH64_DLINK_FLAGS =
>DEF(GCC5_AARCH64_DLINK_FLAGS) -z common-page-size=0x1000
>>    DEBUG_GCC5_AARCH64_DLINK_XIPFLAGS = -z common-page-size=0x20
>>
>> -RELEASE_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS)
>-flto -Wno-unused-but-set-variable -Wno-unused-const-variable -
>mcmodel=tiny -fomit-frame-pointer
>> +RELEASE_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS)
>-flto -Wno-unused-but-set-variable -Wno-unused-const-variable -
>mcmodel=tiny
>>  RELEASE_GCC5_AARCH64_DLINK_FLAGS =
>DEF(GCC5_AARCH64_DLINK_FLAGS) -flto -Os -
>L$(WORKSPACE)/ArmPkg/Library/GccLto -llto-aarch64 -Wl,-plugin-opt=-pass-
>through=-llto-aarch64 -Wno-lto-type-mismatch
>>
>>    NOOPT_GCC5_AARCH64_CC_FLAGS    = DEF(GCC5_AARCH64_CC_FLAGS) -
>O0 -mcmodel=small
>> @@ -5513,7 +5513,7 @@ RELEASE_CLANG35_ARM_CC_FLAGS     =
>DEF(CLANG35_ARM_CC_FLAGS) $(ARCHCC_FLAGS) $(P
>>  *_CLANG35_AARCH64_CC_XIPFLAGS    = DEF(GCC_AARCH64_CC_XIPFLAGS)
>>
>>    DEBUG_CLANG35_AARCH64_CC_FLAGS =
>DEF(CLANG35_AARCH64_CC_FLAGS) $(ARCHCC_FLAGS) $(PLATFORM_FLAGS)
>-O0
>> -RELEASE_CLANG35_AARCH64_CC_FLAGS =
>DEF(CLANG35_AARCH64_CC_FLAGS) $(ARCHCC_FLAGS) $(PLATFORM_FLAGS)
>-Oz -fomit-frame-pointer
>> +RELEASE_CLANG35_AARCH64_CC_FLAGS =
>DEF(CLANG35_AARCH64_CC_FLAGS) $(ARCHCC_FLAGS) $(PLATFORM_FLAGS)
>-Oz
>>
>>
>###########################################################
>#########################
>>  #
>> --
>> 2.11.0
>>