r350900 - Properly support -shared-libgcc.

[Sterling Augustine via cfe-commits]

Author: saugustine
Date: Thu Jan 10 14:25:58 2019
New Revision: 350900

URL: http://llvm.org/viewvc/llvm-project?rev=350900&view=rev
Log:
Properly support -shared-libgcc.
This revision was revied in D55016.


Modified:
    cfe/trunk/lib/Driver/ToolChains/CommonArgs.cpp
    cfe/trunk/test/Driver/linux-ld.c

Modified: cfe/trunk/lib/Driver/ToolChains/CommonArgs.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/ToolChains/CommonArgs.cpp?rev=350900&r1=350899&r2=350900&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/ToolChains/CommonArgs.cpp (original)
+++ cfe/trunk/lib/Driver/ToolChains/CommonArgs.cpp Thu Jan 10 14:25:58 2019
@@ -1159,11 +1159,8 @@ static void AddLibgcc(const llvm::Triple
   bool StaticLibgcc = Args.hasArg(options::OPT_static_libgcc) ||
                       Args.hasArg(options::OPT_static);
 
-  // The driver ignores -shared-libgcc and therefore treats such cases as
-  // unspecified.  Breaking out the two variables as below makes the current
-  // behavior explicit.
-  bool UnspecifiedLibgcc = !StaticLibgcc;
-  bool SharedLibgcc = !StaticLibgcc;
+  bool SharedLibgcc = Args.hasArg(options::OPT_shared_libgcc);
+  bool UnspecifiedLibgcc = !StaticLibgcc && !SharedLibgcc;
 
   // Gcc adds libgcc arguments in various ways:
   //
@@ -1180,7 +1177,7 @@ static void AddLibgcc(const llvm::Triple
   if (LibGccFirst)
     CmdArgs.push_back("-lgcc");
 
-  bool AsNeeded = D.CCCIsCC() && !StaticLibgcc && !isAndroid && !isCygMing;
+  bool AsNeeded = D.CCCIsCC() && UnspecifiedLibgcc && !isAndroid && !isCygMing;
   if (AsNeeded)
     CmdArgs.push_back("--as-needed");
 

Modified: cfe/trunk/test/Driver/linux-ld.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/linux-ld.c?rev=350900&r1=350899&r2=350900&view=diff
==============================================================================
--- cfe/trunk/test/Driver/linux-ld.c (original)
+++ cfe/trunk/test/Driver/linux-ld.c Thu Jan 10 14:25:58 2019
@@ -211,24 +211,19 @@
 // RUN:     --gcc-toolchain="" \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-CLANG-SHARED-LIBGCC %s
-// CHECK-CLANG-SHARED-LIBGCC: warning: argument unused during compilation: '-shared-libgcc'
-// This will be the correct check once the driver supports -shared-libgcc
-// SKIP-CHECK-CLANG-SHARED-LIBGCC: "{{.*}}ld{{(.exe)?}}" "--sysroot=[[SYSROOT:[^"]+]]"
-// SKIP-CHECK-CLANG-SHARED-LIBGCC: "-lgcc_s" "-lgcc"
-// SKIP-CHECK-CLANG-SHARED-LIBGCC: "-lc"
-// SKIP-CHECK-CLANG-SHARED-LIBGCC: "-lgcc_s" "-lgcc"
+// CHECK-CLANG-SHARED-LIBGCC: "{{.*}}ld{{(.exe)?}}" "--sysroot=[[SYSROOT:[^"]+]]"
+// CHECK-CLANG-SHARED-LIBGCC: "-lgcc_s" "-lgcc"
+// CHECK-CLANG-SHARED-LIBGCC: "-lc"
+// CHECK-CLANG-SHARED-LIBGCC: "-lgcc_s" "-lgcc"
 //
 // RUN: %clang -shared-libgcc -dynamic -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=x86_64-unknown-linux -rtlib=platform \
 // RUN:     --gcc-toolchain="" \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-CLANG-SHARED-LIBGCC-DYNAMIC %s
-// CHECK-CLANG-SHARED-LIBGCC-DYNAMIC: warning: argument unused during compilation: '-shared-libgcc'
-// CHECK-CLANG-SHARED-LIBGCC-DYNAMIC: "{{.*}}ld{{(.exe)?}}" "--sysroot=[[SYSROOT:[^"]+]]"
-// This will be the correct check once the driver supports -shared-libgcc
-// SKIP-CHECK-CLANG-SHARED-LIBGCC-DYNAMIC: "-lgcc_s" "-lgcc"
-// SKIP-CHECK-CLANG-SHARED-LIBGCC-DYNAMIC: "-lc"
-// SKIP-CHECK-CLANG-SHARED-LIBGCC-DYNAMIC: "-lgcc_s" "-lgcc"
+// CHECK-CLANG-SHARED-LIBGCC-DYNAMIC: "-lgcc_s" "-lgcc"
+// CHECK-CLANG-SHARED-LIBGCC-DYNAMIC: "-lc"
+// CHECK-CLANG-SHARED-LIBGCC-DYNAMIC: "-lgcc_s" "-lgcc"
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=aarch64-linux-android -rtlib=platform \