[PATCH] D53854: [Driver] Use -push-/-pop-state and -as-needed for libc++ on Fuchsia

[Petr Hosek via Phabricator via cfe-commits]

phosek created this revision.
phosek added a reviewer: mcgrathr.
Herald added a reviewer: EricWF.
Herald added a subscriber: cfe-commits.

This avoids introducing unnecessary DT_NEEDED entries when using
C++ driver for linking C code or C++ code that doesn't use C++
standard library.


Repository:
  rC Clang

https://reviews.llvm.org/D53854

Files:
  clang/lib/Driver/ToolChains/Fuchsia.cpp
  clang/test/Driver/fuchsia.cpp


Index: clang/test/Driver/fuchsia.cpp
===================================================================
--- clang/test/Driver/fuchsia.cpp
+++ clang/test/Driver/fuchsia.cpp
@@ -15,7 +15,11 @@
 // CHECK-NOT: crti.o
 // CHECK-NOT: crtbegin.o
 // CHECK: "-L[[SYSROOT]]{{/|\\\\}}lib"
-// CHECK: "-lc++" "-lm"
+// CHECK: "-push-state"
+// CHECK: "-as-needed"
+// CHECK: "-lc++"
+// CHECK: "-pop-state"
+// CHECK: "-lm"
 // CHECK: "{{.*[/\\]}}libclang_rt.builtins-x86_64.a"
 // CHECK: "-lc"
 // CHECK-NOT: crtend.o
@@ -29,8 +33,10 @@
 // RUN: %clangxx %s -### --target=x86_64-unknown-fuchsia -static-libstdc++ \
 // RUN:     -fuse-ld=lld 2>&1 \
 // RUN:     | FileCheck %s -check-prefix=CHECK-STATIC
-// CHECK-STATIC: "-Bstatic"
+// CHECK-STATIC: "-push-state"
+// CHECK-STATIC: "-as-needed"
+// CHECK-STATIC: "-static"
 // CHECK-STATIC: "-lc++"
-// CHECK-STATIC: "-Bdynamic"
+// CHECK-STATIC: "-pop-state"
 // CHECK-STATIC: "-lm"
 // CHECK-STATIC: "-lc"
Index: clang/lib/Driver/ToolChains/Fuchsia.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Fuchsia.cpp
+++ clang/lib/Driver/ToolChains/Fuchsia.cpp
@@ -122,11 +122,12 @@
       if (ToolChain.ShouldLinkCXXStdlib(Args)) {
         bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
                                    !Args.hasArg(options::OPT_static);
+        CmdArgs.push_back("-push-state");
+        CmdArgs.push_back("-as-needed");
         if (OnlyLibstdcxxStatic)
-          CmdArgs.push_back("-Bstatic");
+          CmdArgs.push_back("-static");
         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
-        if (OnlyLibstdcxxStatic)
-          CmdArgs.push_back("-Bdynamic");
+        CmdArgs.push_back("-pop-state");
       }
       CmdArgs.push_back("-lm");
     }


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