[PATCH] D152207: [HIP] Instruct lld to go through all archives

[Siu Chi Chan via Phabricator via cfe-commits]

scchan created this revision.
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Add the --whole-archive flag when linking HIP programs to instruct lld
to go through every archive library to link in all the kernel functions
(entry pointers to the GPU program); otherwise, lld may skip some
library files if there are no more symbols that need to be resolved.

Change-Id: Ic7ea61ec3e6925f80a63d04654ac72177ffb27c8


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152207

Files:
  clang/lib/Driver/ToolChains/HIPAMD.cpp
  clang/test/Driver/hip-toolchain-rdc-separate.hip
  clang/test/Driver/hip-toolchain-rdc-static-lib.hip


Index: clang/test/Driver/hip-toolchain-rdc-static-lib.hip
===================================================================
--- clang/test/Driver/hip-toolchain-rdc-static-lib.hip
+++ clang/test/Driver/hip-toolchain-rdc-static-lib.hip
@@ -81,6 +81,7 @@
 // CHECK: [[LLD]] {{.*}} "-plugin-opt=-amdgpu-internalize-symbols"
 // CHECK-SAME: "-plugin-opt=mcpu=gfx900"
 // CHECK-SAME: "-o" "[[IMG_DEV2:.*out]]" [[A_BC2]] [[B_BC2]]
+// CHECK-SAME: "--whole-archive"
 
 // combine images generated into hip fat binary object
 // CHECK: [[BUNDLER:".*clang-offload-bundler"]] "-type=o"
Index: clang/test/Driver/hip-toolchain-rdc-separate.hip
===================================================================
--- clang/test/Driver/hip-toolchain-rdc-separate.hip
+++ clang/test/Driver/hip-toolchain-rdc-separate.hip
@@ -129,6 +129,7 @@
 // LLD-TMP-SAME: "-o" "[[IMG_DEV1:.*.out]]"
 // LLD-FIN-SAME: "-o" "[[IMG_DEV1:a.out-.*gfx803]]"
 // LINK-SAME "[[A_BC1]]" "[[B_BC1]]"
+// LINK-SAME: "--whole-archive"
 
 // LINK-NOT: "*.llvm-link"
 // LINK-NOT: ".*opt"
@@ -138,6 +139,7 @@
 // LLD-TMP-SAME: "-o" "[[IMG_DEV2:.*.out]]"
 // LLD-FIN-SAME: "-o" "[[IMG_DEV1:a.out-.*gfx900]]"
 // LINK-SAME "[[A_BC2]]" "[[B_BC2]]"
+// LINK-SAME: "--whole-archive"
 
 // LINK-BUNDLE: [[BUNDLER:".*clang-offload-bundler"]] "-type=o"
 // LINK-BUNDLE-SAME: "-targets={{.*}},hipv4-amdgcn-amd-amdhsa--gfx803,hipv4-amdgcn-amd-amdhsa--gfx900"
Index: clang/lib/Driver/ToolChains/HIPAMD.cpp
===================================================================
--- clang/lib/Driver/ToolChains/HIPAMD.cpp
+++ clang/lib/Driver/ToolChains/HIPAMD.cpp
@@ -163,6 +163,9 @@
 
   // Look for archive of bundled bitcode in arguments, and add temporary files
   // for the extracted archive of bitcode to inputs.
+  // The archive libraries have to be linked with --whole-archive to instruct
+  // the linker to go through every library to look for kernel functions
+  LldArgs.push_back("--whole-archive");
   auto TargetID = Args.getLastArgValue(options::OPT_mcpu_EQ);
   AddStaticDeviceLibsLinking(C, *this, JA, Inputs, Args, LldArgs, "amdgcn",
                              TargetID,


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