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Repack libgcc.a to only include required objects

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Previous solution by using objcopy uses a quirky behaviour of the GNU
objcopy and there is no equivalent option in llvm-objcopy.

Instead of removing symbols, extract and repack libgcc to only include
required objects.

Bug: 142585047
Test: presubmit
Change-Id: I58af74c18838f797e481da38c3265f0624fddf99
This commit is contained in:
Yi Kong
2019-10-15 02:01:19 -07:00
parent 8436ccea9c
commit c49c393f73
4 changed files with 127 additions and 87 deletions
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91
Android.bp
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@@ -579,104 +579,21 @@ toolchain_library {
arch: {
arm: {
src: "prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/lib/gcc/arm-linux-androideabi/4.9.x/libgcc.a",
strip: {
keep_symbols_list: [
// unwind-arm.o
"_Unwind_Complete",
"_Unwind_DeleteException",
"_Unwind_GetCFA",
"_Unwind_VRS_Get",
"_Unwind_VRS_Pop",
"_Unwind_VRS_Set",
"__aeabi_unwind_cpp_pr0",
"__aeabi_unwind_cpp_pr1",
"__aeabi_unwind_cpp_pr2",
"__gnu_Unwind_Backtrace",
"__gnu_Unwind_ForcedUnwind",
"__gnu_Unwind_RaiseException",
"__gnu_Unwind_Resume",
"__gnu_Unwind_Resume_or_Rethrow",
// libunwind.o
"_Unwind_Backtrace",
"_Unwind_ForcedUnwind",
"_Unwind_RaiseException",
"_Unwind_Resume",
"_Unwind_Resume_or_Rethrow",
"___Unwind_Backtrace",
"___Unwind_ForcedUnwind",
"___Unwind_RaiseException",
"___Unwind_Resume",
"___Unwind_Resume_or_Rethrow",
"__gnu_Unwind_Restore_VFP",
"__gnu_Unwind_Restore_VFP_D",
"__gnu_Unwind_Restore_VFP_D_16_to_31",
"__gnu_Unwind_Restore_WMMXC",
"__gnu_Unwind_Restore_WMMXD",
"__gnu_Unwind_Save_VFP",
"__gnu_Unwind_Save_VFP_D",
"__gnu_Unwind_Save_VFP_D_16_to_31",
"__gnu_Unwind_Save_WMMXC",
"__gnu_Unwind_Save_WMMXD",
"__restore_core_regs",
"restore_core_regs",
// pr-support.o
"_Unwind_GetDataRelBase",
"_Unwind_GetLanguageSpecificData",
"_Unwind_GetRegionStart",
"_Unwind_GetTextRelBase",
"__gnu_unwind_execute",
"__gnu_unwind_frame",
],
},
repack_objects_to_keep: ["unwind-arm.o", "libunwind.o", "pr-support.o"],
},
arm64: {
src: "prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/lib/gcc/aarch64-linux-android/4.9.x/libgcc.a",
repack_objects_to_keep: ["unwind-dw2.o", "unwind-dw2-fde-dip.o"],
},
x86: {
src: "prebuilts/gcc/linux-x86/x86/x86_64-linux-android-4.9/lib/gcc/x86_64-linux-android/4.9.x/32/libgcc.a",
repack_objects_to_keep: ["unwind-dw2.o", "unwind-dw2-fde-dip.o"],
},
x86_64: {
src: "prebuilts/gcc/linux-x86/x86/x86_64-linux-android-4.9/lib/gcc/x86_64-linux-android/4.9.x/libgcc.a",
repack_objects_to_keep: ["unwind-dw2.o", "unwind-dw2-fde-dip.o"],
},
},
strip: {
keep_symbols_list: [
// unwind-dw2.o
"_Unwind_Backtrace",
"_Unwind_DeleteException",
"_Unwind_FindEnclosingFunction",
"_Unwind_ForcedUnwind",
"_Unwind_GetCFA",
"_Unwind_GetDataRelBase",
"_Unwind_GetGR",
"_Unwind_GetIP",
"_Unwind_GetIPInfo",
"_Unwind_GetLanguageSpecificData",
"_Unwind_GetRegionStart",
"_Unwind_GetTextRelBase",
"_Unwind_RaiseException",
"_Unwind_Resume",
"_Unwind_Resume_or_Rethrow",
"_Unwind_SetGR",
"_Unwind_SetIP",
"__frame_state_for",
// unwind-dw2-fde-dip.o
"_Unwind_Find_FDE",
"__deregister_frame",
"__deregister_frame_info",
"__deregister_frame_info_bases",
"__register_frame",
"__register_frame_info",
"__register_frame_info_bases",
"__register_frame_info_table",
"__register_frame_info_table_bases",
"__register_frame_table",
],
},
}
toolchain_library {