r354208 - [Driver][Fuchsia] Support -nolibc flag

[Petr Hosek via cfe-commits]

Author: phosek
Date: Sat Feb 16 17:02:40 2019
New Revision: 354208

URL: http://llvm.org/viewvc/llvm-project?rev=354208&view=rev
Log:
[Driver][Fuchsia] Support -nolibc flag

This can be used to disable libc linking. This flag is supported by
GCC since version 9 as well as some Clang target toolchains. This
change also includes tests for all -no* flags which previously weren't
covered.

Differential Revision: https://reviews.llvm.org/D58325

Modified:
    cfe/trunk/lib/Driver/ToolChains/Fuchsia.cpp
    cfe/trunk/test/Driver/fuchsia.c
    cfe/trunk/test/Driver/fuchsia.cpp

Modified: cfe/trunk/lib/Driver/ToolChains/Fuchsia.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/ToolChains/Fuchsia.cpp?rev=354208&r1=354207&r2=354208&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/ToolChains/Fuchsia.cpp (original)
+++ cfe/trunk/lib/Driver/ToolChains/Fuchsia.cpp Sat Feb 16 17:02:40 2019
@@ -148,7 +148,8 @@ void fuchsia::Linker::ConstructJob(Compi
     if (Args.hasArg(options::OPT_fsplit_stack))
       CmdArgs.push_back("--wrap=pthread_create");
 
-    CmdArgs.push_back("-lc");
+    if (!Args.hasArg(options::OPT_nolibc))
+      CmdArgs.push_back("-lc");
   }
 
   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));

Modified: cfe/trunk/test/Driver/fuchsia.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/fuchsia.c?rev=354208&r1=354207&r2=354208&view=diff
==============================================================================
--- cfe/trunk/test/Driver/fuchsia.c (original)
+++ cfe/trunk/test/Driver/fuchsia.c Sat Feb 16 17:02:40 2019
@@ -53,6 +53,27 @@
 // CHECK-RELOCATABLE-NOT: "--build-id"
 // CHECK-RELOCATABLE: "-r"
 
+// RUN: %clang %s -### --target=x86_64-fuchsia -nodefaultlibs -fuse-ld=lld 2>&1 \
+// RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
+// RUN:     | FileCheck %s -check-prefix=CHECK-NODEFAULTLIBS
+// CHECK-NODEFAULTLIBS: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-NODEFAULTLIBS-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK-NODEFAULTLIBS-NOT: "-lc"
+
+// RUN: %clang %s -### --target=x86_64-fuchsia -nostdlib -fuse-ld=lld 2>&1 \
+// RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
+// RUN:     | FileCheck %s -check-prefix=CHECK-NOSTDLIB
+// CHECK-NOSTDLIB: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-NOSTDLIB-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK-NOSTDLIB-NOT: "-lc"
+
+// RUN: %clang %s -### --target=x86_64-fuchsia -nolibc -fuse-ld=lld 2>&1 \
+// RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
+// RUN:     | FileCheck %s -check-prefix=CHECK-NOLIBC
+// CHECK-NOLIBC: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-NOLIBC: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK-NOLIBC-NOT: "-lc"
+
 // RUN: %clang %s -### --target=x86_64-fuchsia \
 // RUN:     -fsanitize=safe-stack 2>&1 \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \

Modified: cfe/trunk/test/Driver/fuchsia.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/fuchsia.cpp?rev=354208&r1=354207&r2=354208&view=diff
==============================================================================
--- cfe/trunk/test/Driver/fuchsia.cpp (original)
+++ cfe/trunk/test/Driver/fuchsia.cpp Sat Feb 16 17:02:40 2019
@@ -43,3 +43,9 @@
 // CHECK-STATIC: "-lm"
 // CHECK-STATIC: "--pop-state"
 // CHECK-STATIC: "-lc"
+
+// RUN: %clang %s -### --target=x86_64-fuchsia -nostdlib++ -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-NOSTDLIBXX
+// CHECK-NOSTDLIBXX-NOT: "-lc++"
+// CHECK-NOSTDLIBXX-NOT: "-lm"
+// CHECK-NOSTDLIBXX: "-lc"