driver: Don't imply -dD for -g3 -g0 [PR97989]

The driver enables -dD when preprocessing when -g3 is specified, for obvious reasons
that we need the macros to be preserved somewhere for them to make up the debug
info.  But it enables it even if -g3 is later overridden to -g2, -g1 or -g0,
where we in the end don't emit .debug_mac{ros,info}.

The following patch passes -dD only if we'll need it.

2020-12-01  Jakub Jelinek  <jakub@redhat.com>

	PR debug/97989
	* gcc.c (cpp_unique_options): Add -dD if %:debug-level-gt(2)
	rather than g3|ggdb3|gstabs3|gxcoff3|gvms3.

	* gcc.dg/cpp/pr97989-1.c: New test.
	* gcc.dg/cpp/pr97989-2.c: New test.

diff --git a/gcc/gcc.c b/gcc/gcc.c
index bd4ad3b..1d32375 100644 (file)
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -1233,7 +1233,7 @@ static const char *cpp_unique_options =
  %{MMD:-MMD %{!o:%b.d}%{o*:%.d%*}}\
  %{M} %{MM} %{MF*} %{MG} %{MP} %{MQ*} %{MT*}\
  %{!E:%{!M:%{!MM:%{!MT:%{!MQ:%{MD|MMD:%{o*:-MQ %*}}}}}}}\
- %{remap} %{g3|ggdb3|gstabs3|gxcoff3|gvms3:-dD}\
+ %{remap} %{%:debug-level-gt(2):-dD}\
  %{!iplugindir*:%{fplugin*:%:find-plugindir()}}\
  %{H} %C %{D*&U*&A*} %{i*} %Z %i\
  %{E|M|MM:%W{o*}}";

diff --git a/gcc/testsuite/gcc.dg/cpp/pr97989-1.c b/gcc/testsuite/gcc.dg/cpp/pr97989-1.c
new file mode 100644 (file)
index 0000000..108dcba
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/cpp/pr97989-1.c
@@ -0,0 +1,8 @@
+/* PR debug/97989 */
+/* { dg-do preprocess } */
+/* { dg-options "-g3 -g2 -P" } */
+
+#define foo bar
+int i;
+
+/* { dg-final { scan-file-not pr97989-1.i "(^|\\n)#define foo bar($|\\n)" } } */

diff --git a/gcc/testsuite/gcc.dg/cpp/pr97989-2.c b/gcc/testsuite/gcc.dg/cpp/pr97989-2.c
new file mode 100644 (file)
index 0000000..77a295a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/cpp/pr97989-2.c
@@ -0,0 +1,8 @@
+/* PR debug/97989 */
+/* { dg-do preprocess } */
+/* { dg-options "-g2 -g3 -P" } */
+
+#define foo bar
+int i;
+
+/* { dg-final { scan-file pr97989-2.i "(^|\\n)#define foo bar($|\\n)" } } */