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The LTO `mxcoff-roptr` check
<https://github.com/llvm/llvm-project/blob/c6b2d25927817bdeca99653ee3e66720f33ce3ae/clang/lib/Driver/ToolChains/CommonArgs.cpp#L750>
against data sections is overly strict and it ignores the fact that data
sections is on by default on AIX
<https://github.com/llvm/llvm-project/blob/c6b2d25927817bdeca99653ee3e66720f33ce3ae/llvm/lib/LTO/LTOCodeGenerator.cpp#L427>,
causing valid LTO compilation to fail when `fdata-sections` is not explicitly
specified for LTO.
This patch revises the check so that an error is reported only if data sections
is explicitly turned off for LTO.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D152021
Files:
clang/lib/Driver/ToolChains/CommonArgs.cpp
clang/test/Driver/ppc-roptr.c
Index: clang/test/Driver/ppc-roptr.c
===================================================================
--- clang/test/Driver/ppc-roptr.c
+++ clang/test/Driver/ppc-roptr.c
@@ -12,7 +12,7 @@
// RUN: %clang -### --target=powerpc-ibm-aix-xcoff %s 2>&1 | \
// RUN: FileCheck %s --check-prefix=NO_ROPTR
// RUN: %clang -### --target=powerpc64-ibm-aix-xcoff -mxcoff-roptr -flto %s
2>&1 | \
-// RUN: FileCheck %s --check-prefixes=ROPTR,LINK,LTO_ROPTR
+// RUN: FileCheck %s
--check-prefixes=NO_DATA_SECTION_ERR,ROPTR,LINK,LTO_ROPTR
// RUN: touch %t.o
// RUN: %clang -### --target=powerpc64-ibm-aix-xcoff -mxcoff-roptr %t.o 2>&1 |
\
// RUN: FileCheck %s --check-prefix=LINK
@@ -33,14 +33,14 @@
// RUN: %clang -### --target=powerpc64le-unknown-linux-gnu -mno-xcoff-roptr
-flto \
// RUN: %t.o 2>&1 | FileCheck %s --check-prefix=TARGET_NOROPTR_ERR
-// ROPTR: "-mxcoff-roptr"
-// LINK: "-bforceimprw"
-// LTO_ROPTR: "-bplugin_opt:-mxcoff-roptr"
-// NO_ROPTR-NOT: "-mxcoff-roptr"
-// NO_ROPTR-NOT: "-bforceimprw"
-
// DATA_SECTION_ERR: error: -mxcoff-roptr is supported only with
-fdata-sections
// NO_DATA_SECTION_ERR-NOT: error: -mxcoff-roptr is supported only with
-fdata-sections
// TARGET_ROPTR_ERR: error: unsupported option '-mxcoff-roptr' for target
'powerpc64le-unknown-linux-gnu'
// TARGET_NOROPTR_ERR: error: unsupported option '-mno-xcoff-roptr' for target
'powerpc64le-unknown-linux-gnu'
// SHARED_ERR: error: -mxcoff-roptr is not supported with -shared
+
+// ROPTR: "-mxcoff-roptr"
+// LINK: "-bforceimprw"
+// LTO_ROPTR: "-bplugin_opt:-mxcoff-roptr"
+// NO_ROPTR-NOT: "-mxcoff-roptr"
+// NO_ROPTR-NOT: "-bforceimprw"
Index: clang/lib/Driver/ToolChains/CommonArgs.cpp
===================================================================
--- clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -747,7 +747,8 @@
if (HasRoptr) {
if (!Args.hasFlag(options::OPT_fdata_sections,
- options::OPT_fno_data_sections, UseSeparateSections))
+ options::OPT_fno_data_sections, UseSeparateSections) &&
+ Args.hasArg(options::OPT_fno_data_sections))
D.Diag(diag::err_roptr_requires_data_sections);
CmdArgs.push_back(
Index: clang/test/Driver/ppc-roptr.c
===================================================================
--- clang/test/Driver/ppc-roptr.c
+++ clang/test/Driver/ppc-roptr.c
@@ -12,7 +12,7 @@
// RUN: %clang -### --target=powerpc-ibm-aix-xcoff %s 2>&1 | \
// RUN: FileCheck %s --check-prefix=NO_ROPTR
// RUN: %clang -### --target=powerpc64-ibm-aix-xcoff -mxcoff-roptr -flto %s 2>&1 | \
-// RUN: FileCheck %s --check-prefixes=ROPTR,LINK,LTO_ROPTR
+// RUN: FileCheck %s --check-prefixes=NO_DATA_SECTION_ERR,ROPTR,LINK,LTO_ROPTR
// RUN: touch %t.o
// RUN: %clang -### --target=powerpc64-ibm-aix-xcoff -mxcoff-roptr %t.o 2>&1 | \
// RUN: FileCheck %s --check-prefix=LINK
@@ -33,14 +33,14 @@
// RUN: %clang -### --target=powerpc64le-unknown-linux-gnu -mno-xcoff-roptr -flto \
// RUN: %t.o 2>&1 | FileCheck %s --check-prefix=TARGET_NOROPTR_ERR
-// ROPTR: "-mxcoff-roptr"
-// LINK: "-bforceimprw"
-// LTO_ROPTR: "-bplugin_opt:-mxcoff-roptr"
-// NO_ROPTR-NOT: "-mxcoff-roptr"
-// NO_ROPTR-NOT: "-bforceimprw"
-
// DATA_SECTION_ERR: error: -mxcoff-roptr is supported only with -fdata-sections
// NO_DATA_SECTION_ERR-NOT: error: -mxcoff-roptr is supported only with -fdata-sections
// TARGET_ROPTR_ERR: error: unsupported option '-mxcoff-roptr' for target 'powerpc64le-unknown-linux-gnu'
// TARGET_NOROPTR_ERR: error: unsupported option '-mno-xcoff-roptr' for target 'powerpc64le-unknown-linux-gnu'
// SHARED_ERR: error: -mxcoff-roptr is not supported with -shared
+
+// ROPTR: "-mxcoff-roptr"
+// LINK: "-bforceimprw"
+// LTO_ROPTR: "-bplugin_opt:-mxcoff-roptr"
+// NO_ROPTR-NOT: "-mxcoff-roptr"
+// NO_ROPTR-NOT: "-bforceimprw"
Index: clang/lib/Driver/ToolChains/CommonArgs.cpp
===================================================================
--- clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -747,7 +747,8 @@
if (HasRoptr) {
if (!Args.hasFlag(options::OPT_fdata_sections,
- options::OPT_fno_data_sections, UseSeparateSections))
+ options::OPT_fno_data_sections, UseSeparateSections) &&
+ Args.hasArg(options::OPT_fno_data_sections))
D.Diag(diag::err_roptr_requires_data_sections);
CmdArgs.push_back(
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