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* [gcc r12-6002] Add new test [PR78969].
@ 2021-12-15 15:44 Martin Sebor
0 siblings, 0 replies; only message in thread
From: Martin Sebor @ 2021-12-15 15:44 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:639ece7abfa3688008cb791aec4c7a1a4f76e59f
commit r12-6002-g639ece7abfa3688008cb791aec4c7a1a4f76e59f
Author: Martin Sebor <msebor@redhat.com>
Date: Wed Dec 15 08:43:02 2021 -0700
Add new test [PR78969].
gcc/testsuite/ChangeLog:
PR tree-optimization/78969
* gcc.dg/tree-ssa/builtin-snprintf-warn-6.c: New test.
Diff:
---
.../gcc.dg/tree-ssa/builtin-snprintf-warn-6.c | 47 ++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/builtin-snprintf-warn-6.c b/gcc/testsuite/gcc.dg/tree-ssa/builtin-snprintf-warn-6.c
new file mode 100644
index 00000000000..2857e83369f
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/builtin-snprintf-warn-6.c
@@ -0,0 +1,47 @@
+/* PR tree-optimization/78969 - bogus snprintf truncation warning due to
+ missing range info
+ { dg-do compile }
+ { dg-options "-O2 -Wall -Wformat-truncation=2" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+extern int snprintf (char*, size_t, const char*, ...);
+
+
+void f (unsigned j, char *p)
+{
+ if (j > 999)
+ j = 0;
+
+ snprintf (p, 4, "%3u", j);
+}
+
+void g (unsigned j, char *p)
+{
+ if (j > 999)
+ return;
+
+ snprintf (p, 4, "%3u", j); // { dg-bogus "-Wformat-truncation" }
+}
+
+
+void pr78969_c4 (char * p /* NNN\0" */)
+{
+ for (int idx = 0; idx < 1000; idx++) {
+ // guaranteed to be in [0-999] range
+ snprintf (p, 4, "%d", idx); // { dg-bogus "-Wformat-truncation" }
+ }
+}
+
+
+void sink (int, ...);
+
+char d[4];
+
+void pr78969_c12 (unsigned i)
+{
+ if (i >= 1000 && i < 10000)
+ snprintf (d, 4, "%3d", i / 10); // { dg-bogus "-Wformat-truncation" }
+ else
+ sink (i / 10 % 10);
+}
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