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[vm/build] Workaround for ld 2.19 crash on ARM

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When producing ARM builds instruct llvm-objcopy to drop .ARM.exidx/extab
sections. These sections don't contain any useful information (we don't use
exceptions or unwind C++ frames and most of the dart binary is in fact not
covered by them), however they have been seen to break dynamic linker in older
glibc versions (pre 2.23) because .ARM.exidx ends up being positioned between
.rel.dyn and .rel.plt sections while older versions of dynamic linker
expect these two sections to appear one after another in the ELF file.

Closes https://github.com/dart-lang/sdk/issues/41644.

Change-Id: I0ceebb63105591f132f3764180ae041366cbcade
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/175723
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Vyacheslav Egorov <vegorov@google.com>
This commit is contained in:
Vyacheslav Egorov 2020-12-11 08:48:38 +00:00 committed by commit-bot@chromium.org
parent e8b0f38ccd
commit e961aa565e
2 changed files with 18 additions and 1 deletions
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8
build/toolchain/gcc_toolchain.gni
View file

@ -204,7 +204,13 @@ template("gcc_toolchain") {
command += " && " + strip_command
} else if (defined(invoker.llvm_objcopy)) {
strip = invoker.llvm_objcopy
strip_command = "${strip} --strip-all $outfile $stripped_outfile"
if (defined(invoker.llvm_objcopy_extra_args)) {
extra_args = invoker.llvm_objcopy_extra_args
} else {
extra_args = ""
}
strip_command =
"${strip} --strip-all ${extra_args} $outfile $stripped_outfile"
command += " && " + strip_command
}
if (defined(invoker.postlink)) {

11
build/toolchain/linux/BUILD.gn
View file

@ -52,6 +52,17 @@ gcc_toolchain("clang_arm") {
ld = cxx
llvm_objcopy = "${prefix}/llvm-objcopy"
# When producing ARM builds we drop .ARM.exidx/extab sections. These sections
# don't contain any useful information (we don't use exceptions or
# unwind C++ frames and most of the dart binary is in fact not covered by
# them), however they have been seen to break dynamic linker in older glibc
# versions (pre 2.23) because .ARM.exidx ends up being positioned between
# .rel.dyn and .rel.plt sections while older versions of dynamic linker
# expect these two sections to appear one after another in the ELF file.
# See https://github.com/dart-lang/sdk/issues/41644.
llvm_objcopy_extra_args =
"--remove-section .ARM.exidx --remove-section .ARM.extab"
toolchain_cpu = "arm"
toolchain_os = "linux"
is_clang = true