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Enable safe ICF with LLD.

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Support for safe ICF was added to LLD in LLVM r337429. This reduces
the size of sailfish system.img by 7.6MB.

The address-significance tables created by Clang to support LLD's
implementation of safe ICF are incompatible with ld -r. Therefore we
need to pass -fno-addrsig to the compiler to prevent it from creating
an address-significance table when building a cc_object.

Change-Id: I83e28741e6b3cdf09566447d2658ce48594f2074
This commit is contained in:
Peter Collingbourne
2018-10-25 10:53:44 -07:00
parent 1e30905f65
commit 486e42c353
2 changed files with 4 additions and 1 deletions
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1
cc/config/clang.go
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@@ -86,7 +86,6 @@ var ClangUnknownCflags = sorted([]string{
// Ldflags that should be filtered out when linking with clang lld
var ClangUnknownLldflags = sorted([]string{
"-fuse-ld=gold",
"-Wl,--icf=safe",
"-Wl,--fix-cortex-a8",
"-Wl,--no-fix-cortex-a8",
"-Wl,-m,aarch64_elf64_le_vec",