[PATCH] testsuite: Add a test case for PR110729

["Kewen.Lin" <linkw@linux.ibm.com>]

Hi,

As PR110729 reported, there was one issue for .section
__patchable_function_entries with -ffunction-sections, that
is we put the same symbol as link_to section symbol for all
functions wrongly.  The commit r13-4294 for PR99889 has
fixed this with the corresponding label LPFE* which sits in
the function_section.

As Fangrui suggested[1], this patch is to add a bit more test
coverage.  I didn't find a good way to check all linked_to
symbols are different, so I checked for LPFE[012] here.

[1] https://gcc.gnu.org/pipermail/gcc-patches/2023-July/624866.html

Tested well on x86_64-redhat-linux, powerpc64-linux-gnu
P7/P8/P9 and powerpc64le-linux-gnu P9/P10.

Is it ok for trunk?

BR,
Kewen
-----
	PR testsuite/110729

gcc/testsuite/ChangeLog:

	* gcc.dg/pr110729.c: New test.
---
 gcc/testsuite/gcc.dg/pr110729.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/pr110729.c

diff --git a/gcc/testsuite/gcc.dg/pr110729.c b/gcc/testsuite/gcc.dg/pr110729.c
new file mode 100644
index 00000000000..92dfd8ae000
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr110729.c
@@ -0,0 +1,29 @@
+/* { dg-do compile { target { ! { nvptx*-*-* visium-*-* } } } } */
+/* { dg-require-effective-target o_flag_in_section } */
+/* { dg-options "-ffunction-sections -fpatchable-function-entry=2" } */
+/* { dg-additional-options "-fno-pie" { target sparc*-*-* } } */
+
+/* Verify there are three different link_to symbols for three
+    .section __patchable_function_entries respectively.  */
+
+int
+f ()
+{
+  return 1;
+}
+
+int
+g ()
+{
+  return 2;
+}
+
+int
+h ()
+{
+  return 3;
+}
+
+/* { dg-final { scan-assembler-times {.section[\t ]*__patchable_function_entries,.*,\.LPFE0} 1 } }  */
+/* { dg-final { scan-assembler-times {.section[\t ]*__patchable_function_entries,.*,\.LPFE1} 1 } }  */
+/* { dg-final { scan-assembler-times {.section[\t ]*__patchable_function_entries,.*,\.LPFE2} 1 } }  */
--
2.39.3