[PATCH] D120305: [Driver] Default CLANG_DEFAULT_PIE_ON_LINUX to ON

[Fangrui Song via Phabricator via llvm-commits]

MaskRay created this revision.
MaskRay added reviewers: foutrelis, sylvestre.ledru, thesamesam, tstellar.
Herald added a subscriber: mgorny.
MaskRay requested review of this revision.
Herald added projects: clang, LLVM.
Herald added subscribers: llvm-commits, cfe-commits.

Default the option introduced in D113372 <https://reviews.llvm.org/D113372> to ON to match all(?) major Linux
distros. This improves behavior consistency with GCC.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D120305

Files:
  clang/CMakeLists.txt
  clang/docs/ReleaseNotes.rst
  clang/test/Driver/hexagon-toolchain-elf.c
  llvm/utils/gn/secondary/clang/include/clang/Config/BUILD.gn
  utils/bazel/llvm-project-overlay/clang/include/clang/Config/config.h


Index: utils/bazel/llvm-project-overlay/clang/include/clang/Config/config.h
===================================================================
--- utils/bazel/llvm-project-overlay/clang/include/clang/Config/config.h
+++ utils/bazel/llvm-project-overlay/clang/include/clang/Config/config.h
@@ -23,7 +23,7 @@
 #define BUG_REPORT_URL "https://github.com/llvm/llvm-project/issues/"
 
 /* Default to -fPIE and -pie on Linux. */
-#define CLANG_DEFAULT_PIE_ON_LINUX 0
+#define CLANG_DEFAULT_PIE_ON_LINUX 1
 
 /* Default linker to use. */
 #define CLANG_DEFAULT_LINKER ""
Index: llvm/utils/gn/secondary/clang/include/clang/Config/BUILD.gn
===================================================================
--- llvm/utils/gn/secondary/clang/include/clang/Config/BUILD.gn
+++ llvm/utils/gn/secondary/clang/include/clang/Config/BUILD.gn
@@ -9,7 +9,7 @@
   output = "$target_gen_dir/config.h"
   values = [
     "BUG_REPORT_URL=https://github.com/llvm/llvm-project/issues/",
-    "CLANG_DEFAULT_PIE_ON_LINUX=",
+    "CLANG_DEFAULT_PIE_ON_LINUX=1",
     "CLANG_DEFAULT_LINKER=",
     "CLANG_DEFAULT_STD_C=",
     "CLANG_DEFAULT_STD_CXX=",
Index: clang/test/Driver/hexagon-toolchain-elf.c
===================================================================
--- clang/test/Driver/hexagon-toolchain-elf.c
+++ clang/test/Driver/hexagon-toolchain-elf.c
@@ -1,3 +1,4 @@
+// UNSUPPORTED: default-pie-on-linux
 // -----------------------------------------------------------------------------
 // Test standard include paths
 // -----------------------------------------------------------------------------
Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -174,6 +174,9 @@
 Build System Changes
 --------------------
 
+* CMake ``-DCLANG_DEFAULT_PIE_ON_LINUX=ON`` is now the default.
+  This matches GCC installations on many Linux distros.
+
 AST Matchers
 ------------
 
Index: clang/CMakeLists.txt
===================================================================
--- clang/CMakeLists.txt
+++ clang/CMakeLists.txt
@@ -245,7 +245,7 @@
 set(CLANG_SPAWN_CC1 OFF CACHE BOOL
     "Whether clang should use a new process for the CC1 invocation")
 
-option(CLANG_DEFAULT_PIE_ON_LINUX "Default to -fPIE and -pie on Linux" OFF)
+option(CLANG_DEFAULT_PIE_ON_LINUX "Default to -fPIE and -pie on Linux" ON)
 
 # TODO: verify the values against LangStandards.def?
 set(CLANG_DEFAULT_STD_C "" CACHE STRING


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