[scudo] Make Scudo compile for C++20

Kostya Kortchinsky · Kostya Kortchinsky · commit 636a1cfdcdb8 · 2022-01-14T14:53:40.000-08:00
In C++20 compound assignment to volatile (here `LocalData[I]++`) is deprecated, so `mutex_test.cpp` fails to compile. Simply changing it to `LocalData[I] = LocalData[I] + 1` fixes it. Differential Revision: https://reviews.llvm.org/D117359
diff --git a/compiler-rt/lib/scudo/standalone/tests/mutex_test.cpp b/compiler-rt/lib/scudo/standalone/tests/mutex_test.cpp
@@ -43,7 +43,7 @@ class TestData {
   void backoff() {
     volatile T LocalData[Size] = {};
     for (scudo::u32 I = 0; I < Size; I++) {
-      LocalData[I]++;
+      LocalData[I] = LocalData[I] + 1;
       EXPECT_EQ(LocalData[I], 1U);
     }
   }

Original file line number	Diff line number	Diff line change
`@@ -43,7 +43,7 @@ class TestData {`
`43`	`43`	`void backoff() {`
`44`	`44`	`volatile T LocalData[Size] = {};`
`45`	`45`	`for (scudo::u32 I = 0; I < Size; I++) {`
`46`		`- LocalData[I]++;`
	`46`	`+ LocalData[I] = LocalData[I] + 1;`
`47`	`47`	`EXPECT_EQ(LocalData[I], 1U);`
`48`	`48`	`}`
`49`	`49`	`}`