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DanAlbertDanAlbert
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[LLD] Enable --no-undefined-version by default.
Allowing incorrect version scripts is not a helpful default. Flip that to help users find their bugs at build time rather than at run time. Reviewed By: MaskRay Differential Revision: https://reviews.llvm.org/D135402
1 parent bd3fa31 commit 7ec8b0d

11 files changed

+18
-14
lines changed

‎lld/ELF/Driver.cpp

Lines changed: 1 addition & 1 deletion
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@@ -1242,7 +1242,7 @@ static void readConfigs(opt::InputArgList &args) {
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config->trace = args.hasArg(OPT_trace);
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config->undefined = args::getStrings(args, OPT_undefined);
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config->undefinedVersion =
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args.hasFlag(OPT_undefined_version, OPT_no_undefined_version, true);
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args.hasFlag(OPT_undefined_version, OPT_no_undefined_version, false);
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config->unique = args.hasArg(OPT_unique);
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config->useAndroidRelrTags = args.hasFlag(
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OPT_use_android_relr_tags, OPT_no_use_android_relr_tags, false);

‎lld/ELF/Options.td

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@@ -440,7 +440,7 @@ defm unresolved_symbols:
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Eq<"unresolved-symbols", "Determine how to handle unresolved symbols">;
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defm undefined_version: B<"undefined-version",
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"Allow unused version in version script (default)",
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"Allow unused version in version script (disabled by default)",
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"Report version scripts that refer undefined symbols">;
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defm rsp_quoting: EEq<"rsp-quoting", "Quoting style for response files">,

‎lld/docs/ReleaseNotes.rst

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@@ -31,6 +31,9 @@ ELF Improvements
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* ``--compress-debug-sections=zstd`` is now available to compress debug
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sections with zstd (``ELFCOMPRESS_ZSTD``).
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(`D133548 <https://reviews.llvm.org/D133548>`_)
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* ``--no-undefined-version`` is now the default; symbols named in version
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scripts that have no matching symbol in the output will be reported. Use
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``--undefined-version`` to revert to the old behavior.
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Breaking changes
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----------------

‎lld/docs/ld.lld.1

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@@ -352,8 +352,8 @@ Do not set the text data sections to be writable, page align sections.
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Disable target-specific relaxations. For x86-64 this disables R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX GOT optimization.
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.It Fl -no-rosegment
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Do not put read-only non-executable sections in their own segment.
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.It Fl -no-undefined-version
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Report version scripts that refer undefined symbols.
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.It Fl -undefined-version
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Do not report version scripts that refer to undefined symbols.
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.It Fl -no-undefined
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Report unresolved symbols even if the linker is creating a shared library.
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.It Fl -no-warn-symbol-ordering

‎lld/test/ELF/verdef-defaultver.s

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,7 @@
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# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %p/Inputs/verdef-defaultver.s -o %t1
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# RUN: echo "V1 { global: a; b; local: *; };" > %t.script
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# RUN: echo "V2 { global: b; c; } V1;" >> %t.script
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# RUN: ld.lld --hash-style=sysv -shared -soname shared %t1 --version-script %t.script -o %t.so
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# RUN: ld.lld --hash-style=sysv -shared -soname shared %t1 --version-script %t.script --undefined-version -o %t.so
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# RUN: llvm-readobj -V --dyn-syms %t.so | FileCheck --check-prefix=DSO %s
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# DSO: DynamicSymbols [
@@ -195,9 +195,9 @@
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# EXE-NEXT: ]
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# RUN: llvm-mc -filetype=obj -triple=x86_64 b.s -o b.o
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# RUN: ld.lld -shared --version-script=%t.script --fatal-warnings %t.so b.o -o b.so
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# RUN: ld.lld -shared --version-script=%t.script --fatal-warnings --undefined-version %t.so b.o -o b.so
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# RUN: llvm-readelf --dyn-syms b.so | FileCheck %s --check-prefix=PREEMPT
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# RUN: ld.lld -shared --version-script=%t.script --fatal-warnings b.o %t.so -o b.so
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# RUN: ld.lld -shared --version-script=%t.script --fatal-warnings --undefined-version b.o %t.so -o b.so
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# RUN: llvm-readelf --dyn-syms b.so | FileCheck %s --check-prefix=PREEMPT
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# PREEMPT-DAG: a@@V1

‎lld/test/ELF/verdef-dependency.s

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Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
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# RUN: echo "LIBSAMPLE_1.0 { global: a; local: *; };" > %t.script
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# RUN: echo "LIBSAMPLE_2.0 { global: b; local: *; } LIBSAMPLE_1.0;" >> %t.script
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# RUN: echo "LIBSAMPLE_3.0 { global: c; } LIBSAMPLE_2.0;" >> %t.script
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# RUN: ld.lld --version-script %t.script -shared -soname shared %t.o -o %t.so
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# RUN: ld.lld --version-script %t.script --undefined-version -shared -soname shared %t.o -o %t.so
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# RUN: llvm-readobj -V --dyn-syms %t.so | FileCheck --check-prefix=DSO %s
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# DSO: VersionDefinitions [

‎lld/test/ELF/verneed.s

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Original file line numberDiff line numberDiff line change
@@ -1,9 +1,9 @@
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# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %S/Inputs/verneed1.s -o %t1.o
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# RUN: echo "v1 {}; v2 {}; v3 { global: f1; local: *; };" > %t.script
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# RUN: ld.lld -shared %t1.o --version-script %t.script -o %t1.so -soname verneed1.so.0
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# RUN: ld.lld -shared %t1.o --version-script %t.script --undefined-version -o %t1.so -soname verneed1.so.0
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# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %S/Inputs/verneed2.s -o %t2.o
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# RUN: ld.lld -shared %t2.o --version-script %t.script -o %t2.so -soname verneed2.so.0
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# RUN: ld.lld -shared %t2.o --version-script %t.script --undefined-version -o %t2.so -soname verneed2.so.0
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# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
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# RUN: ld.lld --hash-style=sysv %t.o %t1.so %t2.so -o %t

‎lld/test/ELF/version-script-extern-undefined.s

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Original file line numberDiff line numberDiff line change
@@ -2,7 +2,7 @@
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# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
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# RUN: echo "FOO { global: extern \"C++\" { \"abb(int)\"; }; };" > %t.script
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# RUN: ld.lld --version-script %t.script -shared %t.o -o %t.so
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# RUN: ld.lld --version-script %t.script --undefined-version -shared %t.o -o %t.so
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# RUN: llvm-readobj -V %t.so | FileCheck %s
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# CHECK: VersionSymbols [

‎lld/test/ELF/version-script-local-preemptible.s

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -10,7 +10,7 @@
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# RUN: echo "{ global: main; local: *; };" > %t.script
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# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o
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# RUN: ld.lld %t.o %t.so -o %t -version-script %t.script
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# RUN: ld.lld %t.o %t.so -o %t -version-script %t.script --undefined-version
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# RUN: llvm-readelf -r --symbols %t | FileCheck %s
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# CHECK: Relocation section '.rela.plt' at offset {{.*}} contains 1 entries:

‎lld/test/ELF/version-script-noundef.s

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2,7 +2,8 @@
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# RUN: echo "VERSION_1.0 { global: bar; };" > %t.script
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# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o
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# RUN: ld.lld --version-script %t.script -shared %t.o -o /dev/null --fatal-warnings
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# RUN: not ld.lld --version-script %t.script -shared %t.o -o /dev/null \
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# RUN: --fatal-warnings 2>&1 | FileCheck -check-prefix=ERR1 %s
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# RUN: ld.lld --version-script %t.script -shared --undefined-version %t.o -o %t.so
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# RUN: not ld.lld --version-script %t.script -shared --no-undefined-version \
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# RUN: %t.o -o %t.so 2>&1 | FileCheck -check-prefix=ERR1 %s

‎lld/test/ELF/version-script-reassign.s

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Original file line numberDiff line numberDiff line change
@@ -24,7 +24,7 @@
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# RUN: llvm-readelf --dyn-syms %t.so | FileCheck --check-prefix=V1-SYM %s
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# RUN: ld.lld -shared %t.o --version-script %t1.ver --version-script %t2w.ver \
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# RUN: -o %t.so --fatal-warnings
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# RUN: -o %t.so --fatal-warnings --undefined-version
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# RUN: llvm-readelf --dyn-syms %t.so | FileCheck --check-prefix=V1-SYM %s
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# LOCAL: warning: attempt to reassign symbol 'foo' of VER_NDX_LOCAL to version 'V1'

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