[compiler-rt] [AIX] Add a dummy variable in the __llvm_orderfile section (PR #81968)

[Wael Yehia via llvm-commits]

https://github.com/w2yehia updated https://github.com/llvm/llvm-project/pull/81968

>From ccd1360d6fe5e2ab2f627c1a7cb94d25817e7b82 Mon Sep 17 00:00:00 2001
From: Wael Yehia <wyehia at ca.ibm.com>
Date: Tue, 13 Feb 2024 22:02:07 -0500
Subject: [PATCH] [AIX] Add a dummy variable in the __llvm_orderfile section

to satisfy the __start___llvm_orderfile reference when linking with
-bexpfull and -fprofile-generate on AIX.
---
 compiler-rt/lib/profile/InstrProfilingPlatformAIX.c | 4 +++-
 compiler-rt/test/profile/AIX/bexpfull-pgo.c         | 7 +++++++
 2 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 compiler-rt/test/profile/AIX/bexpfull-pgo.c

diff --git a/compiler-rt/lib/profile/InstrProfilingPlatformAIX.c b/compiler-rt/lib/profile/InstrProfilingPlatformAIX.c
index 9f46a98d78ac4e..002bec164d7e85 100644
--- a/compiler-rt/lib/profile/InstrProfilingPlatformAIX.c
+++ b/compiler-rt/lib/profile/InstrProfilingPlatformAIX.c
@@ -195,6 +195,8 @@ static const int dummy_name[0] COMPILER_RT_SECTION(
     COMPILER_RT_SEG INSTR_PROF_NAME_SECT_NAME);
 static int dummy_vnds[0] COMPILER_RT_SECTION(
     COMPILER_RT_SEG INSTR_PROF_VNODES_SECT_NAME);
+static int dummy_orderfile[0] COMPILER_RT_SECTION(
+    COMPILER_RT_SEG INSTR_PROF_ORDERFILE_SECT_NAME);
 
 // To avoid GC'ing of the dummy variables by the linker, reference them in an
 // array and reference the array in the runtime registration code
@@ -206,7 +208,7 @@ static int dummy_vnds[0] COMPILER_RT_SECTION(
 COMPILER_RT_VISIBILITY
 void *__llvm_profile_keep[] = {(void *)&dummy_cnts, (void *)&dummy_bits,
                                (void *)&dummy_data, (void *)&dummy_name,
-                               (void *)&dummy_vnds};
+                               (void *)&dummy_vnds, (void *)&dummy_orderfile};
 #ifdef __GNUC__
 #pragma GCC diagnostic pop
 #endif
diff --git a/compiler-rt/test/profile/AIX/bexpfull-pgo.c b/compiler-rt/test/profile/AIX/bexpfull-pgo.c
new file mode 100644
index 00000000000000..f48242ec6bfeaa
--- /dev/null
+++ b/compiler-rt/test/profile/AIX/bexpfull-pgo.c
@@ -0,0 +1,7 @@
+// RUN: %clang_pgogen %s -bexpall
+// RUN: %clang_pgogen %s -bexpfull
+
+#include <string.h>
+int ar[10];
+int n;
+int main() { memcpy(ar, ar + 1, n); };