[Ada] use -gnatd_A to disable .ali on -fcompare-debug recompile

for  gcc/ada/ChangeLog

	* gcc-interface/lang-specs.h (default_compilers): When given
	fcompare-debug-second, adjust auxbase like cc1, and pass
	gnatd_A.
	* gcc-interface/misc.c (flag_compare_debug): Remove variable.
	(gnat_post_options): Do not set it.
	* lib-writ.adb (flag_compare_debug): Remove import.
	(Write_ALI): Do not test it.

From-SVN: r264732

gcc/ada/ChangeLog

+2018-09-30  Alexandre Oliva <oliva@adacore.com>
+
+	* gcc-interface/lang-specs.h (default_compilers): When given
+	fcompare-debug-second, adjust auxbase like cc1, and pass
+	gnatd_A.
+	* gcc-interface/misc.c (flag_compare_debug): Remove variable.
+	(gnat_post_options): Do not set it.
+	* lib-writ.adb (flag_compare_debug): Remove import.
+	(Write_ALI): Do not test it.
+
 2018-09-28  Eric Botcazou  <ebotcazou@adacore.com>
             Pierre-Marie de Rodat  <derodat@adacore.com>
 

gcc/ada/gcc-interface/lang-specs.h

@@ -35,7 +35,8 @@
  gnat1 %{I*} %{k8:-gnatk8} %{Wall:-gnatwa} %{w:-gnatws} %{!Q:-quiet}\
     %{nostdinc*} %{nostdlib*}\
     -dumpbase %{.adb:%b.adb}%{.ads:%b.ads}%{!.adb:%{!.ads:%b.ada}}\
-    %{c|S:%{o*:-auxbase-strip %*}%{!o*:-auxbase %b}}%{!c:%{!S:-auxbase %b}} \
+    %{fcompare-debug-second:%:compare-debug-auxbase-opt(%b) -gnatd_A} \
+    %{!fcompare-debug-second:%{c|S:%{o*:-auxbase-strip %*}%{!o*:-auxbase %b}}%{!c:%{!S:-auxbase %b}}} \
     %{O*} %{W*} %{w} %{p} %{pg:-p} %{d*} \
     %{coverage:-fprofile-arcs -ftest-coverage} "
 #if defined(TARGET_VXWORKS_RTP)

gcc/ada/gcc-interface/misc.c

@@ -77,9 +77,6 @@ int optimize;
 #undef optimize_size
 int optimize_size;
 
-#undef flag_compare_debug
-int flag_compare_debug;
-
 #undef flag_short_enums
 int flag_short_enums;
 
@@ -284,7 +281,6 @@ gnat_post_options (const char **pfilename ATTRIBUTE_UNUSED)
   gnat_encodings = global_options.x_gnat_encodings;
   optimize = global_options.x_optimize;
   optimize_size = global_options.x_optimize_size;
-  flag_compare_debug = global_options.x_flag_compare_debug;
   flag_stack_check = global_options.x_flag_stack_check;
   flag_short_enums = global_options.x_flag_short_enums;
 

gcc/ada/lib-writ.adb

@@ -226,10 +226,6 @@ package body Lib.Writ is
       Num_Sdep : Nat := 0;
       --  Number of active entries in Sdep_Table
 
-      flag_compare_debug : Int;
-      pragma Import (C, flag_compare_debug);
-      --  Import from toplev.c
-
       -----------------------
       -- Local Subprograms --
       -----------------------
@@ -1079,9 +1075,7 @@ package body Lib.Writ is
       --  We never write an ALI file if the original operating mode was
       --  syntax-only (-gnats switch used in compiler invocation line)
 
-      if Original_Operating_Mode = Check_Syntax
-        or flag_compare_debug /= 0
-      then
+      if Original_Operating_Mode = Check_Syntax then
          return;
       end if;