RTEMS Source Builder | RISC-V/GCC 15: Newlib is built allowing unaligned accesses (#144)

[Matteo Concas (@matteo.concas)]

Matteo Concas commented on a discussion: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/issues/144#note_139336


It only adds two, one for RV64IMAFDC and one for RV64IMC. This is the complete patch:
```diff
diff --git a/gcc/config/riscv/t-rtems b/gcc/config/riscv/t-rtems
index f596e764f9d..a4d2d03f560 100644
--- a/gcc/config/riscv/t-rtems
+++ b/gcc/config/riscv/t-rtems
@@ -1,8 +1,8 @@
 MULTILIB_OPTIONS       =
 MULTILIB_DIRNAMES      =

-MULTILIB_OPTIONS       += march=rv32i/march=rv32iac/march=rv32im/march=rv32imf/march=rv32ima/march=rv32imac/march=rv32imaf/march=rv32imafc/march=rv32imafd/march=rv32imafdc/march=rv64ima/march=rv64imac/march=rv64imafd/march=rv64imafdc
-MULTILIB_DIRNAMES      += rv32i       rv32iac       rv32im       rv32imf      rv32ima       rv32imac       rv32imaf       rv32imafc       rv32imafd       rv32imafdc       rv64ima       rv64imac       rv64imafd       rv64imafdc
+MULTILIB_OPTIONS       += march=rv32i/march=rv32iac/march=rv32im/march=rv32imf/march=rv32ima/march=rv32imac/march=rv32imaf/march=rv32imafc/march=rv32imafd/march=rv32imafdc/march=rv64ima/march=rv64imac/march=rv64imafd/march=rv64imafdc/march=rv64imc
+MULTILIB_DIRNAMES      += rv32i       rv32iac       rv32im       rv32imf       rv32ima       rv32imac       rv32imaf       rv32imafc       rv32imafd       rv32imafdc       rv64ima       rv64imac       rv64imafd       rv64imafdc       rv64imc

 MULTILIB_OPTIONS       += mabi=ilp32/mabi=ilp32f/mabi=ilp32d/mabi=lp64/mabi=lp64d
 MULTILIB_DIRNAMES      += ilp32      ilp32f      ilp32d      lp64      lp64d
@@ -10,6 +10,9 @@
 MULTILIB_DIRNAMES     += ilp32      ilp32f      ilp32d      lp64      lp64d
 MULTILIB_OPTIONS       += mcmodel=medany
 MULTILIB_DIRNAMES      += medany

+MULTILIB_OPTIONS       += mstrict-align
+MULTILIB_DIRNAMES      += strict-align
+
 MULTILIB_REQUIRED      =
 MULTILIB_REQUIRED      += march=rv32i/mabi=ilp32
 MULTILIB_REQUIRED      += march=rv32iac/mabi=ilp32
@@ -25,3 +28,5 @@
 MULTILIB_REQUIRED     += march=rv64ima/mabi=lp64/mcmodel=medany
 MULTILIB_REQUIRED      += march=rv64imac/mabi=lp64/mcmodel=medany
 MULTILIB_REQUIRED      += march=rv64imafd/mabi=lp64d/mcmodel=medany
 MULTILIB_REQUIRED      += march=rv64imafdc/mabi=lp64d/mcmodel=medany
+MULTILIB_REQUIRED      += march=rv64imafdc/mabi=lp64d/mcmodel=medany/mstrict-align
+MULTILIB_REQUIRED      += march=rv64imc/mabi=lp64/mcmodel=medany/mstrict-align
```

Extracting the patch and adding it to RSB should be quite straight forward.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/issues/144#note_139336
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