qiongsiwu1 created this revision. qiongsiwu1 added reviewers: hubert.reinterpretcast, w2yehia. qiongsiwu1 added a project: clang. Herald added subscribers: kbarton, inglorion, nemanjai. Herald added a project: All. qiongsiwu1 requested review of this revision. Herald added subscribers: cfe-commits, MaskRay.
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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