test cases: adjust types/char diff test to work with gcc -O2

This case is tweaked to avoid triggering a GCC bug where optimisation
destroys some debug information.

It suffices to ensure that all functions compile to different code.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112372

PiperOrigin-RevId: 582004246
Change-Id: Id514bcd03d13ba6eb43c030fffb537b7148cc4e8

2 files changed, 16 insertions, 12 deletions

diff --git a/test_cases/diff_tests/types/char.0.c b/test_cases/diff_tests/types/char.0.c
index ff5cef5..d24d0ab 100644
--- a/test_cases/diff_tests/types/char.0.c
+++ b/test_cases/diff_tests/types/char.0.c
@@ -1,6 +1,8 @@
-void u(char c) { (void) c; }
-void v(unsigned char c) { (void) c; }
-void w(signed char c) { (void) c; }
-void x(char c) { (void) c; }
-void y(unsigned char c) { (void) c; }
-void z(signed char c) { (void) c; }
+// tweaked due to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112372
+void tweak(int);
+void u(char c) { (void)c; tweak(0); }
+void v(unsigned char c) { (void)c; tweak(1); }
+void w(signed char c) { (void)c; tweak(2); }
+void x(char c) { (void)c; tweak(3); }
+void y(unsigned char c) { (void)c; tweak(4); }
+void z(signed char c) { (void)c; tweak(5); }
diff --git a/test_cases/diff_tests/types/char.1.c b/test_cases/diff_tests/types/char.1.c
index a9291d0..8ab40a0 100644
--- a/test_cases/diff_tests/types/char.1.c
+++ b/test_cases/diff_tests/types/char.1.c
@@ -1,6 +1,8 @@
-void u(unsigned char c) { (void) c; }
-void v(signed char c) { (void) c; }
-void w(char c) { (void) c; }
-void x(signed char c) { (void) c; }
-void y(char c) { (void) c; }
-void z(unsigned char c) { (void) c; }
+// tweaked due to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112372
+void tweak(int);
+void u(unsigned char c) { (void)c; tweak(0); }
+void v(signed char c) { (void)c; tweak(1); }
+void w(char c) { (void)c; tweak(2); }
+void x(signed char c) { (void)c; tweak(3); }
+void y(char c) { (void)c; tweak(4); }
+void z(unsigned char c) { (void)c; tweak(5); }