This patch support sdtrig and ssstrict extensions[1].
To enable GCC to recognize and process sdtrig and ssstrict extensions correctly 
at compile time.

[1] https://github.com/riscv/riscv-profiles/blob/main/src/rva23-profile.adoc

gcc/ChangeLog:

        * common/config/riscv/riscv-common.cc: New extension.

gcc/testsuite/ChangeLog:

        * gcc.target/riscv/arch-45.c: New test.

---
 gcc/common/config/riscv/riscv-common.cc  | 3 +++
 gcc/testsuite/gcc.target/riscv/arch-45.c | 5 +++++
 2 files changed, 8 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/riscv/arch-45.c

diff --git a/gcc/common/config/riscv/riscv-common.cc 
b/gcc/common/config/riscv/riscv-common.cc
index b34409adf39c..e930254bece2 100644
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -400,6 +400,8 @@ static const struct riscv_ext_version 
riscv_ext_version_table[] =
   {"zcmp", ISA_SPEC_CLASS_NONE, 1, 0},
   {"zcmt", ISA_SPEC_CLASS_NONE, 1, 0},

+  {"sdtrig",  ISA_SPEC_CLASS_NONE, 1, 0},
+
   {"smaia",     ISA_SPEC_CLASS_NONE, 1, 0},
   {"smepmp",    ISA_SPEC_CLASS_NONE, 1, 0},
   {"smstateen", ISA_SPEC_CLASS_NONE, 1, 0},
@@ -408,6 +410,7 @@ static const struct riscv_ext_version 
riscv_ext_version_table[] =
   {"sscofpmf",  ISA_SPEC_CLASS_NONE, 1, 0},
   {"ssstateen", ISA_SPEC_CLASS_NONE, 1, 0},
   {"sstc",      ISA_SPEC_CLASS_NONE, 1, 0},
+  {"ssstrict",  ISA_SPEC_CLASS_NONE, 1, 0},

   {"svinval", ISA_SPEC_CLASS_NONE, 1, 0},
   {"svnapot", ISA_SPEC_CLASS_NONE, 1, 0},
diff --git a/gcc/testsuite/gcc.target/riscv/arch-45.c 
b/gcc/testsuite/gcc.target/riscv/arch-45.c
new file mode 100644
index 000000000000..06bc80fe7800
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/arch-45.c
@@ -0,0 +1,5 @@
+/* { dg-do compile } */
+/* { dg-options "-march=rv64gc_sdtrig_ssstrict -mabi=lp64" } */
+int foo()
+{
+}
--
2.43.0

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