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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Mar 2024 09:17:49.8756 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1dd6a84c-8833-45c8-b84d-08dc4f07f08a X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DU2PEPF00028D0C.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DBBPR08MB5882 X-Spam-Status: No, score=-6.4 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,FORGED_SPF_HELO,KAM_DMARC_NONE,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,TXREP,UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 3/27/24 20:07, Joel Sherrill wrote: > > > On Wed, Mar 27, 2024 at 3:53 AM Christophe Lyon via Gcc > wrote: > > Hi! > > On 3/26/24 22:52, Joel Sherrill via Gcc wrote: > > Hi > > > > For RTEMS, we normally build a multilib'ed gcc+newlib, but I have > a case > > where the CPU model is something not covered by our multilibs and > not one > > we are keen to add. I've looked around but not found anything > that makes me > > feel confident. > > > > What's the magic for building a gcc+newlib with a single set of > libraries > > that are built for a specific CPU CFLAGS? > > > > I am trying --disable-multlibs on the gcc configure and adding > > CFLAGS_FOR_TARGET to make. > > > > Advice appreciated. > > > > I would configure GCC with --disable-multilibs --with-cpu=XXX > --with-mode=XXX --with-float=XXX [maybe --with-fpu=XXX] > This way GCC defaults to what you want. > > > Thanks. Is there any documentation or even a good example? I found > --with-mode=[arm|thumb] but am having trouble mapping the others back > to GCC options. I don't know of any good doc/example. I look in gcc/config.gcc to check what is supported. > > I have this for CFLAGS_FOR_TARGET > > "-mcpu=cortex-m7 -mthumb -mlittle-endian -mfloat-abi=hard > -mfpu=fpv5-sp-d16 -march=armv7e-m+fpv5" > > I think that means... > > --with-mode=thumb   for -mthumb > --with-cpu=cortex-m7 for -mcortex-m7 > --with-float=hard         for -mfloat-abi=hard > > That leaves a few options I don't know how to map. > You can see that for arm: supported_defaults="arch cpu float tune fpu abi mode tls" so there's a --with-XXX for any of the above, meaning that there's no --with-endian (default endianness on arm is derived from the target triplet eg. armeb-* vs arm-*) Also note that config.gcc checks that you don't provide both --with-cpu and --with-arch or --with-cpu and --with-tune HTH, Christophe > --joel > > > Thanks, > > Christophe > > > > Thanks. > > > > --joel >