[lld] ELF: Introduce --shuffle-padding flag. (PR #117653)

[Peter Smith via llvm-commits]

================
@@ -0,0 +1,29 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
+
+# RUN: ld.lld %t.o -o %t.out
+# RUN: llvm-readelf -x .rodata %t.out | FileCheck %s
+# CHECK: Hex dump of section '.rodata':
+# CHECK-NEXT: 0x00201120 010203
+
+## --shuffle-padding= inserts segment offset padding and pre-section padding.
+# RUN: ld.lld --shuffle-padding=1 %t.o -o %t.out
+# RUN: llvm-readelf -x .rodata %t.out | FileCheck --check-prefix=PAD1 %s
+# PAD1: Hex dump of section '.rodata':
+# PAD1-NEXT: 0x00201548 0102cc03
+
+## Size of segment offset padding and location of pre-section padding is
+## dependent on the seed.
+# RUN: ld.lld --shuffle-padding=2 %t.o -o %t.out
+# RUN: llvm-readelf -x .rodata %t.out | FileCheck --check-prefix=PAD2 %s
+# PAD2: Hex dump of section '.rodata':
+# PAD2-NEXT: 0x00201dc8 cc010203
+
----------------
smithp35 wrote:

Will be worth adding a .data and .bss test case for the expected behaviour of RW and SHT_NOBITS sections.

https://github.com/llvm/llvm-project/pull/117653