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[Driver] Default CLANG_DEFAULT_PIE_ON_LINUX to ON 

Default the option introduced in D113372 to ON to match all(?) major Linux
distros. This matches GCC and improves consistency with Android and linux-musl
which always default to PIE.
Note: CLANG_DEFAULT_PIE_ON_LINUX will be removed in the future.

Reviewed By: thesamesam

Differential Revision: https://reviews.llvm.org/D120305
This commit is contained in:
Fangrui Song 2022-02-25 00:22:12 +00:00
parent 611122892e
commit 3c4ed02698
5 changed files with 12 additions and 7 deletions
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2
clang/CMakeLists.txt
View File

@ -245,7 +245,7 @@ set(PPC_LINUX_DEFAULT_IEEELONGDOUBLE OFF CACHE BOOL
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-gnu" ON)
# TODO: verify the values against LangStandards.def?
set(CLANG_DEFAULT_STD_C "" CACHE STRING

6
clang/docs/ReleaseNotes.rst
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@ -183,6 +183,12 @@ Internal API Changes
Build System Changes
--------------------
* CMake ``-DCLANG_DEFAULT_PIE_ON_LINUX=ON`` is now the default. This is used by
linux-gnu systems to decide whether ``-fPIE -pie`` is the default (instead of
``-fno-pic -no-pie``). This matches GCC installations on many Linux distros.
Note: linux-android and linux-musl always default to ``-fPIE -pie``, ignoring
this variable. ``-DCLANG_DEFAULT_PIE_ON_LINUX`` will be removed in the future.
AST Matchers
------------

7
clang/test/Driver/hip-fpie-option.hip
View File

@ -1,15 +1,15 @@
// REQUIRES: clang-driver, amdgpu-registered-target
// REQUIRES: clang-driver, amdgpu-registered-target, default-pie-on-linux
// -fPIC and -fPIE only affects host relocation model.
// device compilation always uses PIC.
// RUN: %clang -### -target x86_64-unknown-linux-gnu \
// RUN: --offload-arch=gfx906 %s -nogpulib -nogpuinc \
// RUN: 2>&1 | FileCheck -check-prefixes=DEV,HOST-STATIC %s
// RUN: 2>&1 | FileCheck -check-prefixes=DEV,HOST-PIE %s
// RUN: %clang -### -target x86_64-unknown-linux-gnu \
// RUN: -fgpu-rdc --offload-arch=gfx906 %s -nogpulib -nogpuinc \
// RUN: 2>&1 | FileCheck -check-prefixes=DEV,HOST-STATIC %s
// RUN: 2>&1 | FileCheck -check-prefixes=DEV,HOST-PIE %s
// RUN: %clang -### -target x86_64-unknown-linux-gnu \
// RUN: --offload-arch=gfx906 %s -nogpulib -nogpuinc \
@ -32,7 +32,6 @@
// RUN: 2>&1 | FileCheck -check-prefixes=DEV,HOST-PIE %s
// DEV-DAG: {{".*clang.*".* "-triple" "amdgcn-amd-amdhsa".* "-mrelocation-model" "pic" "-pic-level" "[1|2]".* "-mframe-pointer=all"}}
// HOST-STATIC-DAG: {{".*clang.*".* "-triple" "x86_64-unknown-linux-gnu".* "-mrelocation-model" "static"}}
// HOST-PIC-DAG: {{".*clang.*".* "-triple" "x86_64-unknown-linux-gnu".* "-mrelocation-model" "pic" "-pic-level" "2"}}
// HOST-PIC-NOT: "-pic-is-pie"
// HOST-PIE-DAG: {{".*clang.*".* "-triple" "x86_64-unknown-linux-gnu".* "-mrelocation-model" "pic" "-pic-level" "2" "-pic-is-pie"}}

2
llvm/utils/gn/secondary/clang/include/clang/Config/BUILD.gn
View File

@ -9,7 +9,7 @@ write_cmake_config("Config") {
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=",

2
utils/bazel/llvm-project-overlay/clang/include/clang/Config/config.h
View File

@ -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 ""