[ELF2] Add support for GNU Hash section
This patch implements --hash-style command line switch.
* By default, or with "sysv" or "both" parameters, the linker generates
a standard ELF hash section.
* With "gnu" or "both", it produces a GNU-style hash section.
That section requires the symbols in the dynamic symbol table section, which
are referenced in the GNU hash section, to be placed after not hashed ones and
to be sorted to correspond the order of hash buckets in the GNU Hash section.
The division function, as well as estimations for the section's parameters,
are just the first rough attempt and the subjects for further adjustments.
Differential Revision: http://reviews.llvm.org/D13815
llvm-svn: 251000
diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
index 94e7ecc..4760bb7 100644
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -155,6 +155,17 @@
Config->SoName = getString(Args, OPT_soname);
Config->Sysroot = getString(Args, OPT_sysroot);
+ if (auto *Arg = Args.getLastArg(OPT_hash_style)) {
+ StringRef S = Arg->getValue();
+ if (S == "gnu") {
+ Config->GnuHash = true;
+ Config->SysvHash = false;
+ } else if (S == "both") {
+ Config->GnuHash = true;
+ } else if (S != "sysv")
+ error("Unknown hash style: " + S);
+ }
+
for (auto *Arg : Args.filtered(OPT_undefined))
Config->Undefined.push_back(Arg->getValue());