[gcc r12-1673] [Ada] powerpc64-wrs-vxworks7r2: build shared libgnat

[Pierre-Marie de Rodat]

https://gcc.gnu.org/g:3045dd3c1769f9016a5d8f8ea3fd7e1f50a28232

commit r12-1673-g3045dd3c1769f9016a5d8f8ea3fd7e1f50a28232
Author: Frederic Konrad <konrad@adacore.com>
Date:   Fri Nov 6 20:08:28 2020 +0100

    [Ada] powerpc64-wrs-vxworks7r2: build shared libgnat
    
    gcc/ada/
    
            * Makefile.rtl: Compiles both static and dynamic libgnat for
            powerpc64-wrs-vxworks7r2.

Diff:
---
 gcc/ada/Makefile.rtl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gcc/ada/Makefile.rtl b/gcc/ada/Makefile.rtl
index 7f075c7f986..37311818778 100644
--- a/gcc/ada/Makefile.rtl
+++ b/gcc/ada/Makefile.rtl
@@ -1194,6 +1194,13 @@ ifeq ($(strip $(filter-out powerpc% wrs vxworks vxworksspe vxworks7% vxworks7spe
     GCC_SPEC_FILES+=vxworks-cert-$(ARCH_STR)-link.spec
     GCC_SPEC_FILES+=vxworks-smp-$(ARCH_STR)-link.spec
   endif
+
+  ifeq ($(strip $(filter-out vxworks7r2 powerpc64 rtp rtp-smp, $(target_os) $(target_cpu) $(THREAD_KIND))),)
+    # Shared libraries are only supported on PowerPC64, VxWorks7r2
+    # ATM.  Also this is disabled for kernel runtimes.
+    GNATLIB_SHARED = gnatlib-shared-dual
+    LIBRARY_VERSION := $(LIB_VERSION)
+  endif
 endif
 
 # PowerPC and e500v2 VxWorks 653