[llvm-branch-commits] [compiler-rt] release/18.x: [AIX] Add a dummy variable in the __llvm_orderfile section (#81968) (PR #82148)

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https://github.com/llvmbot created 
https://github.com/llvm/llvm-project/pull/82148

Backport 15cccc55919d27eb2e89379a65f6c7809f679fda

Requested by: @brad0

>From b27f0b4fae68fea5c2468bc080e31bcecfb7faa7 Mon Sep 17 00:00:00 2001
From: Wael Yehia <44115484+w2ye...@users.noreply.github.com>
Date: Fri, 16 Feb 2024 12:55:20 -0500
Subject: [PATCH] [AIX] Add a dummy variable in the __llvm_orderfile section
 (#81968)

to satisfy the __start___llvm_orderfile reference when linking with
-bexpfull and -fprofile-generate on AIX.

(cherry picked from commit 15cccc55919d27eb2e89379a65f6c7809f679fda)
---
 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); };

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