tools: disable LTO for "v8_cppgc_shared" target #38346
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"PushAllRegistersAndIterateStack" is implemented in assembly and called from "stack.cc" via 'extern "C"'. [1] However, LTO does not work well with symbol usage from assembly. [2] This change workarounds the issue by disabling LTO for the target. With GCC 10 and "./configure --enable-lto", compilation succeeds after this change. [1] v8/v8@c10863153 [2] https://gcc.gnu.org/wiki/LinkTimeOptimizationFAQ#Symbol_usage_from_assembly_language Refs: #35957 Refs: #38335 Signed-off-by: Jesse Chan <jc@linux.com>
richardlau
approved these changes
Apr 22, 2021
| ], | ||
| 'conditions': [ | ||
| ['enable_lto=="true"', { | ||
| 'cflags_cc': [ '-fno-lto' ], |
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This could be set regardless of the enable_lto setting?
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Technically, yes, at least for GCC. But I am not sure about MSVC or Clang. Since enable_lto implies some other conditions, I think it is better to have this conditional.
joyeecheung
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Apr 22, 2021
joyeecheung
approved these changes
Apr 22, 2021
Trott
approved these changes
Apr 27, 2021
gengjiawen
approved these changes
Apr 29, 2021
|
Landed in 6ca785b |
gengjiawen
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"PushAllRegistersAndIterateStack" is implemented in assembly and called from "stack.cc" via 'extern "C"'. [1] However, LTO does not work well with symbol usage from assembly. [2] This change workarounds the issue by disabling LTO for the target. With GCC 10 and "./configure --enable-lto", compilation succeeds after this change. [1] v8/v8@c10863153 [2] https://gcc.gnu.org/wiki/LinkTimeOptimizationFAQ#Symbol_usage_from_assembly_language Refs: #35957 Refs: #38335 Signed-off-by: Jesse Chan <jc@linux.com> PR-URL: #38346 Refs: #35957 Refs: #38335 Reviewed-By: Khaidi Chu <i@2333.moe> Reviewed-By: Richard Lau <rlau@redhat.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
targos
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Apr 29, 2021
"PushAllRegistersAndIterateStack" is implemented in assembly and called from "stack.cc" via 'extern "C"'. [1] However, LTO does not work well with symbol usage from assembly. [2] This change workarounds the issue by disabling LTO for the target. With GCC 10 and "./configure --enable-lto", compilation succeeds after this change. [1] v8/v8@c10863153 [2] https://gcc.gnu.org/wiki/LinkTimeOptimizationFAQ#Symbol_usage_from_assembly_language Refs: #35957 Refs: #38335 Signed-off-by: Jesse Chan <jc@linux.com> PR-URL: #38346 Refs: #35957 Refs: #38335 Reviewed-By: Khaidi Chu <i@2333.moe> Reviewed-By: Richard Lau <rlau@redhat.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
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"PushAllRegistersAndIterateStack" is implemented in assembly and
called from "stack.cc" via 'extern "C"'. [1]
However, LTO does not work well with symbol usage from assembly. [2]
This change workarounds the issue by disabling LTO for the target.
With GCC 10 and "./configure --enable-lto", compilation succeeds
after this change.
[1] v8/v8@c10863153
[2] https://gcc.gnu.org/wiki/LinkTimeOptimizationFAQ#Symbol_usage_from_assembly_language
Refs: #35957
Refs: #38335
Signed-off-by: Jesse Chan jc@linux.com