tests: debuginfo: Work around or disable broken tests on powerpc

src/tools/compiletest/src/directives.rs

@@ -854,6 +854,7 @@ const KNOWN_DIRECTIVE_NAMES: &[&str] = &[
     "ignore-openbsd",
     "ignore-pass",
     "ignore-powerpc",
+    "ignore-powerpc64",
     "ignore-remote",
     "ignore-riscv64",
     "ignore-rustc-debug-assertions",

tests/debuginfo/basic-types-globals-metadata.rs

@@ -59,7 +59,10 @@ static mut F64: f64 = 3.5;
 fn main() {
     _zzz(); // #break
 
-    let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F16, F32, F64) };
+    let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F32, F64) };
+    // N.B. Including f16 and f32 in the same tuple emits `__gnu_h2f_ieee`, which does
+    // not exist on some targets like PowerPC
+    let b = unsafe { F16 };
 }
 
 fn _zzz() {()}

tests/debuginfo/basic-types-globals.rs

@@ -63,7 +63,10 @@ static mut F64: f64 = 3.5;
 fn main() {
     _zzz(); // #break
 
-    let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F16, F32, F64) };
+    let a = unsafe { (B, I, C, I8, I16, I32, I64, U, U8, U16, U32, U64, F32, F64) };
+    // N.B. Including f16 and f32 in the same tuple emits `__gnu_h2f_ieee`, which does
+    // not exist on some targets like PowerPC
+    let b = unsafe { F16 };
 }
 
 fn _zzz() {()}

tests/debuginfo/by-value-non-immediate-argument.rs

@@ -3,6 +3,7 @@
 //@ compile-flags:-g
 //@ ignore-windows-gnu: #128973
 //@ ignore-aarch64-unknown-linux-gnu (gdb tries to read from 0x0; FIXME: #128973)
+//@ ignore-powerpc64: #128973 on both -gnu and -musl
 
 // === GDB TESTS ===================================================================================