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

This matches gcc -static-pie. The intention is to prevent dynamic
relocations in read-only segments.

In ld.bfd and gold, -z notext is the default. If text relocations are needed:

* -z notext: allow and emit DF_TEXTREL.
  DF_TEXTREL is not emitted if there is no text relocation.
* -z text: error

In lld, -z text is the default (this change is a no-op).

* -z text: error on text relocations
* -z notext: allow text relocations, and emit DF_TEXTREL no matter whether
  text relocations exist.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D62606

llvm-svn: 362050
This commit is contained in:
Fangrui Song 2019-05-30 01:55:43 +00:00
parent a05fda68bc
commit 0666f9c4e4
2 changed files with 8 additions and 0 deletions
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2
clang/lib/Driver/ToolChains/Gnu.cpp
View File

@ -382,6 +382,8 @@ void tools::gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
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()) {

6
clang/test/Driver/linux-ld.c
View File

@ -190,6 +190,8 @@
// 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"
@ -203,6 +205,8 @@
// 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"
@ -216,6 +220,8 @@
// 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"