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Add a -exported-symbol option to llvm-lto. 

Patch by Tom Roeder.

llvm-svn: 191825
This commit is contained in:
Rafael Espindola 2013-10-02 14:12:56 +00:00
parent 3402c057db
commit dafc53dde1
2 changed files with 17 additions and 0 deletions
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7
llvm/test/LTO/cfi_endproc.ll
View File

@ -1,5 +1,8 @@
; RUN: llvm-as < %s >%t1
; RUN: llvm-lto -o %t2 %t1
; RUN: llvm-nm %t2 | FileCheck %s -check-prefix=NOEXPORT
; RUN: llvm-lto -o %t3 -exported-symbol=main %t1
; RUN: llvm-nm %t3 | FileCheck %s -check-prefix=EXPORT
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@ -13,7 +16,11 @@ module asm ".cfi_endproc"
declare void @PR14512()
; Without -exported-symbol, main should be eliminated by LTO.
; With -exported-symbol=main, main should be preserved by LTO.
define i32 @main(i32 %argc, i8** %argv) {
; NOEXPORT-NOT: main
; EXPORT: main
call void @PR14512()
ret i32 0
}

10
llvm/tools/llvm-lto/llvm-lto.cpp
View File

@ -45,6 +45,12 @@ OutputFilename("o", cl::init(""),
cl::desc("Override output filename"),
cl::value_desc("filename"));
static cl::list<std::string>
ExportedSymbols("exported-symbol",
cl::desc("Symbol to export from the resulting object file"),
cl::ZeroOrMore);
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal();
@ -107,6 +113,10 @@ int main(int argc, char **argv) {
}
}
// Add all the exported symbols to the table of symbols to preserve.
for (unsigned i = 0; i < ExportedSymbols.size(); ++i)
CodeGen.addMustPreserveSymbol(ExportedSymbols[i].c_str());
if (!OutputFilename.empty()) {
size_t len = 0;
std::string ErrorInfo;