[gcc r11-3252] C-SKY: Add -msim option

[gcc r11-3252] C-SKY: Add -msim option

[qu]

https://gcc.gnu.org/g:6ee9c216532c49e162c80fbbdc011afb184e8973

commit r11-3252-g6ee9c216532c49e162c80fbbdc011afb184e8973
Author: Jojo R <jiejie_rong@c-sky.com>
Date:   Wed Sep 16 19:47:41 2020 +0800

    C-SKY: Add -msim option
    
    gcc/ChangeLog:
    
            * config/csky/csky.opt (msim): New.
            * doc/invoke.texi (C-SKY Options): Document -msim.
            * config/csky/csky-elf.h (LIB_SPEC): Add simulator runtime.

Diff:
---
 gcc/config/csky/csky-elf.h | 10 ++++++++--
 gcc/config/csky/csky.opt   |  4 ++++
 gcc/doc/invoke.texi        |  7 ++++++-
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/gcc/config/csky/csky-elf.h b/gcc/config/csky/csky-elf.h
index 15a0e73baa4..a79d757c0de 100644
--- a/gcc/config/csky/csky-elf.h
+++ b/gcc/config/csky/csky-elf.h
@@ -70,8 +70,14 @@
  %{EL:-EL} -X"
 
 #undef	LIB_SPEC
-#define LIB_SPEC \
-  "%{pthread:-lpthread} -lc %{mccrt:-lcc-rt}"
+#define LIB_SPEC "\
+%{pthread:-lpthread} \
+--start-group \
+-lc \
+%{msim:-lsemi}%{!msim:-lnosys} \
+--end-group \
+%{mccrt:-lcc-rt} \
+"
 /* FIXME add this to LIB_SPEC when need */
 /*   %{!shared:%{profile:-lc_p}%{!profile:-lc}}" */
 
diff --git a/gcc/config/csky/csky.opt b/gcc/config/csky/csky.opt
index 60b51e5798f..505a7642293 100644
--- a/gcc/config/csky/csky.opt
+++ b/gcc/config/csky/csky.opt
@@ -192,3 +192,7 @@ Set the branch costs to roughly the specified number of instructions.
 msched-prolog
 Target Report Var(flag_sched_prolog) Init(0)
 Permit scheduling of function prologue and epilogue sequences.
+
+msim
+Target
+Use the simulator runtime.
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 6d9ff2c3362..9176c8306f0 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -829,7 +829,7 @@ Objective-C and Objective-C++ Dialects}.
 -mdsp  -medsp  -mvdsp @gol
 -mdiv  -msmart  -mhigh-registers  -manchor @gol
 -mpushpop  -mmultiple-stld  -mconstpool  -mstack-size  -mccrt @gol
--mbranch-cost=@var{n}  -mcse-cc  -msched-prolog}
+-mbranch-cost=@var{n}  -mcse-cc  -msched-prolog -msim}
 
 @emph{Darwin Options}
 @gccoptlist{-all_load  -allowable_client  -arch  -arch_errors_fatal @gol
@@ -20835,6 +20835,11 @@ this option can result in code that is not compliant with the C-SKY V2 ABI
 prologue requirements and that cannot be debugged or backtraced.
 It is disabled by default.
 
+@item -msim
+@opindex msim
+Links the library libsemi.a which is in compatible with simulator. Applicable
+to ELF compiler only.
+
 @end table
 
 @node Darwin Options