[gcc r10-9299] RTEMS: Fix GCC specification

[gcc r10-9299] RTEMS: Fix GCC specification

[Sebastian Huber]

https://gcc.gnu.org/g:9fe1c085f0af6e6c05a6813eeae44136ea8ce566

commit r10-9299-g9fe1c085f0af6e6c05a6813eeae44136ea8ce566
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date:   Fri Jan 22 12:45:49 2021 +0100

    RTEMS: Fix GCC specification
    
    The use of -nostdlib and -nodefaultlibs disables the processing of
    LIB_SPEC (%L) as specified by LINK_COMMAND_SPEC and thus disables the
    default linker script for RTEMS.  Move the linker script to
    STARTFILE_SPEC which is controlled by -nostdlib and -nostartfiles.  This
    fits better since the linker script defines the platform start file
    provided by the board support package in RTEMS.
    
    gcc/
    
            * config/rtems.h (STARTFILE_SPEC): Remove nostdlib and
            nostartfiles handling since this is already done by
            LINK_COMMAND_SPEC.  Evaluate qnolinkcmds.
            (ENDFILE_SPEC): Remove nostdlib and nostartfiles handling since this
            is already done by LINK_COMMAND_SPEC.
            (LIB_SPECS): Remove nostdlib and nodefaultlibs handling since
            this is already done by LINK_COMMAND_SPEC.  Remove qnolinkcmds
            evaluation.
    
    (cherry picked from commit 28229916e1b131ad5d17a73603f65229e0a92f58)

Diff:
---
 gcc/config/rtems.h | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/gcc/config/rtems.h b/gcc/config/rtems.h
index 30ad6258949..7d1a23fb54d 100644
--- a/gcc/config/rtems.h
+++ b/gcc/config/rtems.h
@@ -36,11 +36,11 @@
  */
 #undef STARTFILE_SPEC
 #define STARTFILE_SPEC "%{!qrtems:crt0%O%s} " \
-"%{qrtems:%{!nostdlib:%{!nostartfiles:" RTEMS_STARTFILE_SPEC "}}}"
+"%{qrtems:" RTEMS_STARTFILE_SPEC " %{!qnolinkcmds:-T linkcmds%s}}"
 
 #undef ENDFILE_SPEC
 #define ENDFILE_SPEC \
-"%{qrtems:%{!nostdlib:%{!nostartfiles:" RTEMS_ENDFILE_SPEC "}}}"
+"%{qrtems:" RTEMS_ENDFILE_SPEC "}"
 
 /*
  * Some targets do not set up LIB_SPECS, override it, here.
@@ -49,9 +49,7 @@
 
 #undef LIB_SPEC
 #define LIB_SPEC "%{!qrtems:" STD_LIB_SPEC "} " \
-"%{qrtems:%{!nostdlib:%{!nodefaultlibs:" \
-"--start-group -lrtemsbsp -lrtemscpu -latomic -lc -lgcc --end-group} " \
-"%{!qnolinkcmds:-T linkcmds%s}}}"
+"%{qrtems:--start-group -lrtemsbsp -lrtemscpu -latomic -lc -lgcc --end-group}"
 
 #define TARGET_POSIX_IO