From: Richard Biener <rguenther@suse.de>
Date: Wed, 18 Jan 2023 13:54:33 +0000 (+0100)
Subject: lto/108445 - avoid LTO decl wrapping being confused by tree sharing
X-Git-Tag: basepoints/gcc-14~1965
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d4abe5c456a3023f61c3e053255b7dd72ca0d7ec;p=thirdparty%2Fgcc.git

lto/108445 - avoid LTO decl wrapping being confused by tree sharing

r13-4743 exposed more tree sharing which runs into a latent issue
with LTO decl wrapping during streaming.  The following adds a
testcase triggering the issue.

	PR lto/108445
	* gcc.dg/lto/pr108445_0.c: New testcase.
	* gcc.dg/lto/pr108445_1.c: Likewise.
---

diff --git a/gcc/testsuite/gcc.dg/lto/pr108445_0.c b/gcc/testsuite/gcc.dg/lto/pr108445_0.c
new file mode 100644
index 000000000000..06dac691e84b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/lto/pr108445_0.c
@@ -0,0 +1,4 @@
+/* { dg-lto-do link } */
+/* { dg-lto-options { "-g -O2 -flto" } } */
+
+int gArray[16];
diff --git a/gcc/testsuite/gcc.dg/lto/pr108445_1.c b/gcc/testsuite/gcc.dg/lto/pr108445_1.c
new file mode 100644
index 000000000000..50db9feb8a5f
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/lto/pr108445_1.c
@@ -0,0 +1,19 @@
+extern int gArray[];
+
+int foo(int *a)
+{
+  int *p = a;
+
+  return *p;
+}
+
+int main(int argc, char *argv[])
+{
+  if (argc & 1)
+    gArray[argc - 1] = 1;
+
+  if (argc > 1)
+    return foo(gArray);
+
+  return 0;
+}