[Driver] -static-pie: add -z text

[MaskRay]

Summary

gcc -static-pie adds -z text.

In ld.bfd and gold, default/-z text/-z notext are tri-state.
By default, text relocations (and DF_TEXTREL) are emitted on demand.
-z text disables that.

In lld, -z text (default) and -z notext are bi-state. This change is a no-op.

[sivachandra]

LGTM

cfe/trunk/lib/Driver/ToolChains/Gnu.cpp

void tools::gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
 
   if (IsPIE)
     CmdArgs.push_back("-pie");
 
   if (IsStaticPIE) {
     CmdArgs.push_back("-static");
     CmdArgs.push_back("-pie");
     CmdArgs.push_back("--no-dynamic-linker");
+    CmdArgs.push_back("-z");
+    CmdArgs.push_back("text");
   }
 
   if (ToolChain.isNoExecStackDefault()) {
     CmdArgs.push_back("-z");
     CmdArgs.push_back("noexecstack");
   }
 
   if (Args.hasArg(options::OPT_rdynamic))

cfe/trunk/test/Driver/linux-ld.c

 // RUN:     --target=x86_64-unknown-linux -rtlib=platform \
 // RUN:     --gcc-toolchain="" \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-CLANG-LD-STATIC-PIE %s
 // CHECK-CLANG-LD-STATIC-PIE: "{{.*}}ld{{(.exe)?}}" "--sysroot=[[SYSROOT:[^"]+]]"
 // CHECK-CLANG-LD-STATIC-PIE: "-static"
 // CHECK-CLANG-LD-STATIC-PIE: "-pie"
 // CHECK-CLANG-LD-STATIC-PIE: "--no-dynamic-linker"
+// CHECK-CLANG-LD-STATIC-PIE: "-z"
+// CHECK-CLANG-LD-STATIC-PIE: "text"
 // CHECK-CLANG-LD-STATIC-PIE: "-m" "elf_x86_64"
 // CHECK-CLANG-LD-STATIC-PIE: "{{.*}}rcrt1.o"
 // CHECK-CLANG-LD-STATIC-PIE: "--start-group" "-lgcc" "-lgcc_eh" "-lc" "--end-group"
 //
 // RUN: %clang -static-pie -pie -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-LD-STATIC-PIE-PIE %s
 // CHECK-CLANG-LD-STATIC-PIE-PIE: "{{.*}}ld{{(.exe)?}}" "--sysroot=[[SYSROOT:[^"]+]]"
 // CHECK-CLANG-LD-STATIC-PIE-PIE: "-static"
 // CHECK-CLANG-LD-STATIC-PIE-PIE: "-pie"
 // CHECK-CLANG-LD-STATIC-PIE-PIE: "--no-dynamic-linker"
+// CHECK-CLANG-LD-STATIC-PIE-PIE: "-z"
+// CHECK-CLANG-LD-STATIC-PIE-PIE: "text"
 // CHECK-CLANG-LD-STATIC-PIE-PIE: "-m" "elf_x86_64"
 // CHECK-CLANG-LD-STATIC-PIE-PIE: "{{.*}}rcrt1.o"
 // CHECK-CLANG-LD-STATIC-PIE-PIE: "--start-group" "-lgcc" "-lgcc_eh" "-lc" "--end-group"
 //
 // RUN: %clang -static-pie -static -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-LD-STATIC-PIE-STATIC %s
 // CHECK-CLANG-LD-STATIC-PIE-STATIC: "{{.*}}ld{{(.exe)?}}" "--sysroot=[[SYSROOT:[^"]+]]"
 // CHECK-CLANG-LD-STATIC-PIE-STATIC: "-static"
 // CHECK-CLANG-LD-STATIC-PIE-STATIC: "-pie"
 // CHECK-CLANG-LD-STATIC-PIE-STATIC: "--no-dynamic-linker"
+// CHECK-CLANG-LD-STATIC-PIE-STATIC: "-z"
+// CHECK-CLANG-LD-STATIC-PIE-STATIC: "text"
 // CHECK-CLANG-LD-STATIC-PIE-STATIC: "-m" "elf_x86_64"
 // CHECK-CLANG-LD-STATIC-PIE-STATIC: "{{.*}}rcrt1.o"
 // CHECK-CLANG-LD-STATIC-PIE-STATIC: "--start-group" "-lgcc" "-lgcc_eh" "-lc" "--end-group"
 //
 // RUN: %clang -static-pie -nopie -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 \