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Strip libgcc to only keep fallback symbols

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We use libgcc as fallback for symbols not present in libclang_rt
builtins, however we didn't know what exact symbols were being used,
some may not be intended to fallback.

Create libgcc_stripped, which only contains unwind symbols from libgcc.

Bug: 29275768
Test: bionic-unit-tests
Change-Id: I5b349fa6138e51663bf3b67109b880b4356da8e8
This commit is contained in:
Yi Kong
2019-03-29 20:05:14 -07:00
parent feef2ef4d7
commit acee27cd72
9 changed files with 201 additions and 27 deletions
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8
cc/linker.go
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@@ -228,10 +228,10 @@ func (linker *baseLinker) linkerDeps(ctx DepsContext, deps Deps) Deps {
// libclang_rt.builtins, libgcc and libatomic have to be last on the command line
if !Bool(linker.Properties.No_libcrt) {
deps.LateStaticLibs = append(deps.LateStaticLibs, config.BuiltinsRuntimeLibrary(ctx.toolchain()))
}
deps.LateStaticLibs = append(deps.LateStaticLibs, "libatomic")
if !Bool(linker.Properties.No_libgcc) {
deps.LateStaticLibs = append(deps.LateStaticLibs, "libatomic")
deps.LateStaticLibs = append(deps.LateStaticLibs, "libgcc_stripped")
} else if !Bool(linker.Properties.No_libgcc) {
deps.LateStaticLibs = append(deps.LateStaticLibs, "libatomic")
deps.LateStaticLibs = append(deps.LateStaticLibs, "libgcc")
}