[PATCH] D151186: [Driver] Properly handle -pie and -nopie on Fuchsia

[Petr Hosek via Phabricator via cfe-commits]

phosek created this revision.
phosek added a reviewer: phosek.
Herald added a subscriber: abrachet.
Herald added a project: All.
phosek requested review of this revision.
Herald added subscribers: cfe-commits, MaskRay.
Herald added a project: clang.

Prior to this patch we would ignore -pie and -nopie options but that
could lead to issues when compiling code that uses either of these
flags.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151186

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


Index: clang/test/Driver/fuchsia.c
===================================================================
--- clang/test/Driver/fuchsia.c
+++ clang/test/Driver/fuchsia.c
@@ -75,6 +75,14 @@
 // RUN:     | FileCheck %s -check-prefix=CHECK-RTLIB
 // CHECK-RTLIB: error: invalid runtime library name in argument '-rtlib=libgcc'
 
+// RUN: %clang -### %s --target=x86_64-unknown-fuchsia -pie -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-PIE
+// CHECK-PIE: "-pie"
+
+// RUN: %clang -### %s --target=x86_64-unknown-fuchsia -nopie -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-NOPIE
+// CHECK-NOPIE: "-no-pie"
+
 // RUN: %clang -### %s --target=x86_64-unknown-fuchsia -static -fuse-ld=lld 2>&1 \
 // RUN:     | FileCheck %s -check-prefix=CHECK-STATIC
 // CHECK-STATIC: "-Bstatic"
Index: clang/lib/Driver/ToolChains/Fuchsia.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Fuchsia.cpp
+++ clang/lib/Driver/ToolChains/Fuchsia.cpp
@@ -71,8 +71,14 @@
   if (!D.SysRoot.empty())
     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
 
-  if (!Args.hasArg(options::OPT_shared) && !Args.hasArg(options::OPT_r))
-    CmdArgs.push_back("-pie");
+  if (!Args.hasArg(options::OPT_shared) && !Args.hasArg(options::OPT_r)) {
+    Arg *A = Args.getLastArg(options::OPT_pie, options::OPT_no_pie,
+                             options::OPT_nopie);
+    if (!A || A->getOption().matches(options::OPT_pie))
+      CmdArgs.push_back("-pie");
+    else
+      CmdArgs.push_back("-no-pie");
+  }
 
   if (Args.hasArg(options::OPT_rdynamic))
     CmdArgs.push_back("-export-dynamic");


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