[PATCH] D72363: [PowerPC] Default ppc64 linux-gnu/freebsd to -fno-PIC

[Fangrui Song via Phabricator via cfe-commits]

MaskRay created this revision.
MaskRay added reviewers: PowerPC, adalava, Bdragon28, sfertile, stefanp.
Herald added subscribers: cfe-commits, steven.zhang, shchenz, jsji, kbarton, krytarowski, arichardson, nemanjai, emaste.
Herald added a project: clang.

According to D53384 <https://reviews.llvm.org/D53384>, the default was switched from -fno-PIC to -fPIC to
work around a -fsanitize=leak bug on big-endian.

This gratuitous difference between little-endian and big-endian is
undesired, and not acceptable on powerpc64-unknown-freebsd.  If
-fsanitize=leak still has the problem, we should default to -fPIC/-fPIE
only when -fsanitize=leak is specified.

powerpc64-ibm-aix is unaffected: it still defaults to -fPIC.
powerpc64-linux-musl is unaffected: it still defaults to -fPIE.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D72363

Files:
  clang/lib/Driver/ToolChains/Gnu.cpp
  clang/test/Driver/ppc-abi.c


Index: clang/test/Driver/ppc-abi.c
===================================================================
--- clang/test/Driver/ppc-abi.c
+++ clang/test/Driver/ppc-abi.c
@@ -28,18 +28,20 @@
 // RUN: %clang -target powerpc64-unknown-freebsd12 %s -### 2>&1 | FileCheck --check-prefix=CHECK-ELFv1 %s
 // RUN: %clang -target powerpc64-unknown-freebsd13 %s -### 2>&1 | FileCheck --check-prefix=CHECK-ELFv2-BE %s
 // RUN: %clang -target powerpc64-unknown-freebsd14 %s -### 2>&1 | FileCheck --check-prefix=CHECK-ELFv2-BE %s
-// RUN: %clang -target powerpc64-linux-musl %s -### 2>&1 | FileCheck --check-prefix=CHECK-ELFv2-BE %s
+// RUN: %clang -target powerpc64-linux-musl %s -### 2>&1 | FileCheck --check-prefix=CHECK-ELFv2-BE-PIE %s
 
-// CHECK-ELFv1: "-mrelocation-model" "pic" "-pic-level" "2"
+// CHECK-ELFv1: "-mrelocation-model" "static"
 // CHECK-ELFv1: "-target-abi" "elfv1"
 // CHECK-ELFv1-LE: "-mrelocation-model" "static"
 // CHECK-ELFv1-LE: "-target-abi" "elfv1"
-// CHECK-ELFv1-QPX: "-mrelocation-model" "pic" "-pic-level" "2"
+// CHECK-ELFv1-QPX: "-mrelocation-model" "static"
 // CHECK-ELFv1-QPX: "-target-abi" "elfv1-qpx"
 // CHECK-ELFv2: "-mrelocation-model" "static"
 // CHECK-ELFv2: "-target-abi" "elfv2"
-// CHECK-ELFv2-BE: "-mrelocation-model" "pic" "-pic-level" "2"
+// CHECK-ELFv2-BE: "-mrelocation-model" "static"
 // CHECK-ELFv2-BE: "-target-abi" "elfv2"
+// CHECK-ELFv2-BE-PIE: "-mrelocation-model" "pic" "-pic-level" "2" "-pic-is-pie"
+// CHECK-ELFv2-BE-PIE: "-target-abi" "elfv2"
 
 // RUN: %clang -fPIC -target powerpc64-unknown-linux-gnu %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck -check-prefix=CHECK-ELFv1-PIC %s
Index: clang/lib/Driver/ToolChains/Gnu.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Gnu.cpp
+++ clang/lib/Driver/ToolChains/Gnu.cpp
@@ -2615,9 +2615,6 @@
   switch (getArch()) {
   case llvm::Triple::x86_64:
     return getTriple().isOSWindows();
-  case llvm::Triple::ppc64:
-    // Big endian PPC is PIC by default
-    return !getTriple().isOSBinFormatMachO() && !getTriple().isMacOSX();
   case llvm::Triple::mips64:
   case llvm::Triple::mips64el:
     return true;


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