[gcc r17-1359] RISC-V: Specify cmodel in OPTION_DEFAULT_SPECS

[Kito Cheng]

https://gcc.gnu.org/g:218780d6c7b93cec4d7088079820491b6b8f2771

commit r17-1359-g218780d6c7b93cec4d7088079820491b6b8f2771
Author: Kito Cheng <kito.cheng@sifive.com>
Date:   Thu Jun 4 22:49:37 2026 +0800

    RISC-V: Specify cmodel in OPTION_DEFAULT_SPECS
    
    We have supported --with-cmodel for a while and set the default via
    TARGET_DEFAULT_CMODEL.  That works well in general, but not for
    multilib, because GCC cannot detect the cmodel for the current multilib
    correctly that way.  So we still need to specify the default cmodel in
    OPTION_DEFAULT_SPECS.
    
    gcc/ChangeLog:
    
            * config/riscv/riscv.h (OPTION_DEFAULT_SPECS): Specify default
            cmodel.

Diff:
---
 gcc/config/riscv/riscv.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/config/riscv/riscv.h b/gcc/config/riscv/riscv.h
index b98a4a4df608..cb821ae8b3a6 100644
--- a/gcc/config/riscv/riscv.h
+++ b/gcc/config/riscv/riscv.h
@@ -66,6 +66,7 @@ extern const char *riscv_arch_help (int argc, const char **argv);
    --with-tune is ignored if -mtune or -mcpu is specified.
    --with-isa-spec is ignored if -misa-spec is specified.
    --with-tls is ignored if -mtls-dialect is specified.
+   --with-cmodel is ignored if -mcmodel is specified.
 
    Uses default values if -mcpu doesn't have a valid option.  */
 #define OPTION_DEFAULT_SPECS \
@@ -79,6 +80,7 @@ extern const char *riscv_arch_help (int argc, const char **argv);
   {"abi", "%{!mabi=*:-mabi=%(VALUE)}" },				\
   {"isa_spec", "%{!misa-spec=*:-misa-spec=%(VALUE)}" },			\
   {"tls", "%{!mtls-dialect=*:-mtls-dialect=%(VALUE)}"},         	\
+  {"cmodel", "%{!mcmodel=*:-mcmodel=%(VALUE)}" },			\
 
 #ifdef IN_LIBGCC2
 #undef TARGET_64BIT