[PATCH] D59721: [WebAssembly] Make driver -pthread imply linker --shared-memory

[Thomas Lively via Phabricator via cfe-commits]

tlively created this revision.
tlively added reviewers: sbc100, aheejin.
Herald added subscribers: cfe-commits, jfb, sunfish, jgravelle-google, dschuff.
Herald added a project: clang.

This eliminates a linker error the user might otherwise see about how
using the 'atomics' feature requires --shared-memory.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D59721

Files:
  clang/lib/Driver/ToolChains/WebAssembly.cpp
  clang/test/Driver/wasm-toolchain.c


Index: clang/test/Driver/wasm-toolchain.c
===================================================================
--- clang/test/Driver/wasm-toolchain.c
+++ clang/test/Driver/wasm-toolchain.c
@@ -41,9 +41,10 @@
 
 // Thread-related command line tests.
 
-// '-pthread' sets '-target-feature +atomics'
+// '-pthread' sets '-target-feature +atomics' and '--shared-memory'
 // RUN: %clang -### -no-canonical-prefixes -target wasm32-unknown-unknown --sysroot=/foo %s -pthread 2>&1 | FileCheck -check-prefix=PTHREAD %s
 // PTHREAD: clang{{.*}}" "-cc1" {{.*}} "-target-feature" "+atomics"
+// PTHREAD: wasm-ld{{.*}}" "-lpthread" "--shared-memory"
 
 // '-pthread' not allowed with '-mno-atomics'
 // RUN: %clang -### -no-canonical-prefixes -target wasm32-unknown-unknown --sysroot=/foo %s -pthread -mno-atomics 2>&1 | FileCheck -check-prefix=PTHREAD_NO_ATOMICS %s
Index: clang/lib/Driver/ToolChains/WebAssembly.cpp
===================================================================
--- clang/lib/Driver/ToolChains/WebAssembly.cpp
+++ clang/lib/Driver/ToolChains/WebAssembly.cpp
@@ -62,8 +62,10 @@
     if (ToolChain.ShouldLinkCXXStdlib(Args))
       ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
 
-    if (Args.hasArg(options::OPT_pthread))
+    if (Args.hasArg(options::OPT_pthread)) {
       CmdArgs.push_back("-lpthread");
+      CmdArgs.push_back("--shared-memory");
+    }
 
     CmdArgs.push_back("-lc");
     AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args);


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D59721.191955.patch
Type: text/x-patch
Size: 1473 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20190322/e779e392/attachment.bin>