[Ada] Refactor compilation of Ada units in Makefile.rtl

2018-06-11  Arnaud Charlet  <charlet@adacore.com>

gcc/ada/

	* Makefile.rtl: Compile Ada files with $(ADAC) instead of $(CC).

From-SVN: r261404

gcc/ada/ChangeLog

+2018-06-11  Arnaud Charlet  <charlet@adacore.com>
+
+	* Makefile.rtl: Compile Ada files with $(ADAC) instead of $(CC).
+
 2018-06-11  Hristian Kirtchev  <kirtchev@adacore.com>
 
 	* exp_ch11.adb, exp_unst.adb, inline.adb, sem_ch12.adb, sem_util.adb:

gcc/ada/Makefile.rtl

@@ -17,11 +17,14 @@
 #along with GCC; see the file COPYING3.  If not see
 #<http://www.gnu.org/licenses/>.
 
-# This makefile fragment is included in the ada Makefile (both Unix
-# and Windows).
+# This makefile fragment is included in the ada Makefile.
 
-# Its purpose is to allow the separate maintainence of the list of
-# GNATRTL objects, which frequently changes.
+# Its purpose is to allow the separate maintenance of the list of
+# GNATRTL objects and target pairs, which frequently changes.
+
+ifndef ADAC
+ADAC=$(CC)
+endif
 
 # Objects needed only for tasking
 GNATRTL_TASKING_OBJS= \
@@ -2682,15 +2685,16 @@ setup-rts: force
 # optimization. We don't want inlining, either.
 
 s-traceb.o  : s-traceb.adb s-traceb.ads
-	$(CC) -c $(ALL_ADAFLAGS) $(FORCE_DEBUG_ADAFLAGS) $(NO_INLINE_ADAFLAGS) \
-	      $(NO_SIBLING_ADAFLAGS) $(ADA_INCLUDES) $< $(OUTPUT_OPTION)
+	$(ADAC) -c $(ALL_ADAFLAGS) $(FORCE_DEBUG_ADAFLAGS) \
+	  $(NO_INLINE_ADAFLAGS) $(NO_SIBLING_ADAFLAGS) $(ADA_INCLUDES) $< \
+	  $(OUTPUT_OPTION)
 
 # compile s-tasdeb.o without optimization and with debug info so that it is
 # always possible to set conditional breakpoints on tasks.
 
 s-tasdeb.o  : s-tasdeb.adb s-tasdeb.ads
-	$(CC) -c $(ALL_ADAFLAGS) $(FORCE_DEBUG_ADAFLAGS) -O0 $(ADA_INCLUDES) \
-	      $< $(OUTPUT_OPTION)
+	$(ADAC) -c $(ALL_ADAFLAGS) $(FORCE_DEBUG_ADAFLAGS) -O0 $(ADA_INCLUDES) \
+	  $< $(OUTPUT_OPTION)
 
 # force no function reordering on a-except.o because of the exclusion bounds
 # mechanism (see the source file for more detailed information).
@@ -2699,35 +2703,36 @@ s-tasdeb.o  : s-tasdeb.adb s-tasdeb.ads
 # use -O1 otherwise gdb isn't able to get a full backtrace on mips targets.
 
 a-except.o  : a-except.adb a-except.ads
-	$(CC) -c $(ALL_ADAFLAGS) $(FORCE_DEBUG_ADAFLAGS) $(NO_INLINE_ADAFLAGS) \
-	      $(NO_REORDER_ADAFLAGS) -O1 $(ADA_INCLUDES) $< $(OUTPUT_OPTION)
+	$(ADAC) -c $(ALL_ADAFLAGS) $(FORCE_DEBUG_ADAFLAGS) \
+	  $(NO_INLINE_ADAFLAGS) $(NO_REORDER_ADAFLAGS) -O1 $(ADA_INCLUDES) \
+	  $< $(OUTPUT_OPTION)
 
 # compile s-excdeb.o without optimization and with debug info to let the
 # debugger set breakpoints and inspect subprogram parameters on exception
 # related events.
 
 s-excdeb.o  : s-excdeb.adb s-excdeb.ads s-except.ads
-	$(CC) -c $(ALL_ADAFLAGS) $(FORCE_DEBUG_ADAFLAGS) -O0 $(ADA_INCLUDES) \
-	      $< $(OUTPUT_OPTION)
+	$(ADAC) -c $(ALL_ADAFLAGS) $(FORCE_DEBUG_ADAFLAGS) -O0 \
+	  $(ADA_INCLUDES) $< $(OUTPUT_OPTION)
 
 # force debugging information on s-assert.o so that it is always
 # possible to set breakpoint on assert failures.
 
 s-assert.o  : s-assert.adb s-assert.ads
-	$(CC) -c $(ALL_ADAFLAGS) $(FORCE_DEBUG_ADAFLAGS) $(ADA_INCLUDES) \
-	      $< $(OUTPUT_OPTION)
+	$(ADAC) -c $(ALL_ADAFLAGS) $(FORCE_DEBUG_ADAFLAGS) $(ADA_INCLUDES) \
+	  $< $(OUTPUT_OPTION)
 
 # force debugging information on a-tags.o so that the debugger can find
 # the description of Ada.Tags.Type_Specific_Data.
 
 a-tags.o  : a-tags.adb a-tags.ads
-	$(CC) -c $(ALL_ADAFLAGS) $(FORCE_DEBUG_ADAFLAGS) $(ADA_INCLUDES) \
-	      $< $(OUTPUT_OPTION)
+	$(ADAC) -c $(ALL_ADAFLAGS) $(FORCE_DEBUG_ADAFLAGS) $(ADA_INCLUDES) \
+	  $< $(OUTPUT_OPTION)
 
 # force no sibling call optimization on s-memory.o to avoid turning the
 # tail recursion in Alloc into a loop that confuses branch prediction.
 
 s-memory.o  : s-memory.adb s-memory.ads
-	$(CC) -c $(ALL_ADAFLAGS) $(NO_SIBLING_ADAFLAGS) $(ADA_INCLUDES) \
-	      $< $(OUTPUT_OPTION)
+	$(ADAC) -c $(ALL_ADAFLAGS) $(NO_SIBLING_ADAFLAGS) $(ADA_INCLUDES) \
+	  $< $(OUTPUT_OPTION)