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boundary="------------rSS7IGJg58O03xbXkU3WZpDA" Message-ID: <29fb3c0e-4724-40ef-935e-7dc2cff314e9@linux.ibm.com> Date: Tue, 28 Jul 2026 23:19:48 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1] PowerPC: Use -mcmodel=large for the compile command To: Ulrich Weigand , "gdb-patches@sourceware.org" Cc: Abhay Kandpal , "cel@linux.ibm.com" References: <20260728064909.1080844-1-abhay@linux.ibm.com> Content-Language: en-GB From: Abhay Kandpal In-Reply-To: X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzI4MDE1NiBTYWx0ZWRfX7yfB0QuQfHkk EzKF2wWOORViShNrkOEzntKEdOmxTYDpM/tESgXeINNKCbbnpwcES/ycz1QkrC19OXQtZoq/rXO Qm9RxxUSQ0DlVI1MfF8f5SPCU35IdW4= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzI4MDE1NiBTYWx0ZWRfX2h+N9QGtDsg+ ZFbqgMzgNWPzlpp2+uqurC69xhhDySUPq/WgkCpgBJJFtvIlVecZfnAe6tdYERBuGTyMy/7OHcc sRFFhb2SnvdokPUAcdSfwNEo8gjUWFUR8I8el2fSXfIi7gKrHkhp5oAaTgh4wOnj3NA3zFIPy0p gxhozP5Szik/r7AxcxW+bRf2EiokEdDg4sRdJWGwUtOS0+sepGJepdun+bzy3hRFow8UNsfE3XD bNxU2mz2EeDlUFWoEH6pDID+MJwSJq7b71evWN9rvrhIke+GowJed/rfNnhrB9Cc+ymFBnDDz3N bkduFwa3ot5FmDl0cEwSvRmjRphUzWjNYwWGO2jHdboY4ktT6cPKQDKbQsOglU2Btn8N7VmVic7 3XjMhIeoTSqTWnbfWhZII1GjdaOGhUZS6N5J34oOtjMBrryVujXtIu9TunkTiE+m/yFibDm2RaZ x+uTDpBWmTtXHDktSmQ== X-Authority-Analysis: v=2.4 cv=b5WCJNGx c=1 sm=1 tr=0 ts=6a68ebc4 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=r77TgQKjGQsHNAKrUKIA:9 a=VnNF1IyMAAAA:8 a=3_Yjx0V2wnuPN2Yf5SsA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=XULCmX6iPAbDnR_AcgsA:9 a=RkEgjtkMTqVQE0rY:21 a=_W_S_7VecoQA:10 a=lqcHg5cX4UMA:10 X-Proofpoint-GUID: Huiw7N1rzeH_h9ffZVbrBUFmCBxm4xEX X-Proofpoint-ORIG-GUID: Huiw7N1rzeH_h9ffZVbrBUFmCBxm4xEX X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-28_04,2026-07-28_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 adultscore=0 malwarescore=0 impostorscore=0 bulkscore=0 phishscore=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607280156 X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org This is a multi-part message in MIME format. --------------rSS7IGJg58O03xbXkU3WZpDA Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Thanks Ulrich — v2 fully reverts 533f04079c7 as you suggested, so ppc64 uses default_gcc_target_options. BR, Abhay On 28/07/26 15:54, Ulrich Weigand wrote: > Abhay Kandpal wrote: > >> The cause is the code model used to compile the injected object. >> Commit 533f04079c7 ("[gdb] [rs6000] Add >> ppc64_linux_gcc_target_options method.") made ppc64 return an empty >> string from gdbarch_gcc_target_options, overriding the >> "-mcmodel=large" that default_gcc_target_options supplies for 64-bit >> targets, so GCC falls back to -mcmodel=medium. > I can see why large model is more appropriate for this type > of compilation. However, your patch just reverts the effect > of the above commit, without actually reverting it. (This > causes ppc64_linux_gcc_target_options to pretty much duplicate > default_gcc_target_options.) I think it would be preferable > to fully revert the commit instead. > > Bye, > Ulrich --------------rSS7IGJg58O03xbXkU3WZpDA Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit 
Thanks Ulrich — v2 fully reverts 533f04079c7 as you suggested, so ppc64 uses default_gcc_target_options.

BR,
Abhay
On 28/07/26 15:54, Ulrich Weigand wrote:
Abhay Kandpal <abhay@linux.ibm.com> wrote:


The cause is the code model used to compile the injected object.
Commit 533f04079c7 ("[gdb] [rs6000] Add
ppc64_linux_gcc_target_options method.") made ppc64 return an empty
string from gdbarch_gcc_target_options, overriding the
"-mcmodel=large" that default_gcc_target_options supplies for 64-bit
targets, so GCC falls back to -mcmodel=medium.

I can see why large model is more appropriate for this type
of compilation.  However, your patch just reverts the effect
of the above commit, without actually reverting it.  (This
causes ppc64_linux_gcc_target_options to pretty much duplicate
default_gcc_target_options.)  I think it would be preferable
to fully revert the commit instead.

Bye,
Ulrich
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