From: Jakub Jelinek <jakub@redhat.com>
Date: Fri, 22 Jun 2018 21:08:00 +0000 (+0200)
Subject: backport: re PR debug/85252 (ICE with -g for static zero-length array initialization)
X-Git-Tag: releases/gcc-7.4.0~339
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7b42eb87dccf59fdb4ee63020caf3f41677a0763;p=thirdparty%2Fgcc.git

backport: re PR debug/85252 (ICE with -g for static zero-length array initialization)

	Backported from mainline
	2018-04-06  Jakub Jelinek  <jakub@redhat.com>

	PR debug/85252
	* dwarf2out.c (rtl_for_decl_init): For STRING_CST initializer only
	build CONST_STRING if TYPE_MAX_VALUE is non-NULL and is INTEGER_CST.

	* gcc.dg/debug/pr85252.c: New test.

From-SVN: r261950
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index dd6bc807df06..27d2c31947b1 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,6 +1,12 @@
 2018-06-22  Jakub Jelinek  <jakub@redhat.com>
 
 	Backported from mainline
+	2018-04-06  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/85252
+	* dwarf2out.c (rtl_for_decl_init): For STRING_CST initializer only
+	build CONST_STRING if TYPE_MAX_VALUE is non-NULL and is INTEGER_CST.
+
 	2018-04-03  Jakub Jelinek  <jakub@redhat.com>
 
 	PR rtl-optimization/85167
diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index 43bb121fb21c..7e1ce9e152a7 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -18749,6 +18749,8 @@ rtl_for_decl_init (tree init, tree type)
 
       if (GET_MODE_CLASS (mode) == MODE_INT && GET_MODE_SIZE (mode) == 1
 	  && domain
+	  && TYPE_MAX_VALUE (domain)
+	  && TREE_CODE (TYPE_MAX_VALUE (domain)) == INTEGER_CST
 	  && integer_zerop (TYPE_MIN_VALUE (domain))
 	  && compare_tree_int (TYPE_MAX_VALUE (domain),
 			       TREE_STRING_LENGTH (init) - 1) == 0
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 0fd38c54cbe9..42d07edd3f0b 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -3,6 +3,9 @@
 	Backported from mainline
 	2018-04-06  Jakub Jelinek  <jakub@redhat.com>
 
+	PR debug/85252
+	* gcc.dg/debug/pr85252.c: New test.
+
 	PR c++/85210
 	* g++.dg/cpp1z/decomp42.C: New test.
 
diff --git a/gcc/testsuite/gcc.dg/debug/pr85252.c b/gcc/testsuite/gcc.dg/debug/pr85252.c
new file mode 100644
index 000000000000..6e5ca85bc868
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/debug/pr85252.c
@@ -0,0 +1,11 @@
+/* PR debug/85252 */
+/* { dg-do compile } */
+
+void
+foo (void)
+{
+  static char a[0] = "";
+  static char b[0] = "b";	/* { dg-warning "initializer-string for array of chars is too long" } */
+  static char c[1] = "c";
+  static char d[1] = "de";	/* { dg-warning "initializer-string for array of chars is too long" } */
+}