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[llvm-objcopy] Make modifications in-place if output is not specified 

If the output file is not specified make the modifications in-place 
(like binutils objcopy does). In particular, this fixes 
the behavior of Clang -gsplit-dwarf (if Clang is configured to use llvm-objcopy), 
previously it was creating .dwo files, but still leaving *dwo* sections in 
the original binary.

Test plan: make check-all

Differential revision: https://reviews.llvm.org/D42873

llvm-svn: 324783
This commit is contained in:
Alexander Shaposhnikov 2018-02-09 23:33:31 +00:00
parent 99db883d55
commit fedb01603c
2 changed files with 34 additions and 3 deletions
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29
llvm/test/tools/llvm-objcopy/strip-dwo-inplace.test Normal file
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@ -0,0 +1,29 @@
# RUN: cp %p/Inputs/dwarf.dwo %t
# RUN: llvm-objcopy -strip-dwo %t
# RUN: llvm-readobj -file-headers -sections %t | FileCheck %s
CHECK: SectionHeaderCount: 24
CHECK: Name: .text
CHECK: Name: .rodata.str1.1
CHECK: Name: .debug_str
CHECK: Name: .debug_abbrev
CHECK: Name: .debug_info
CHECK: Name: .debug_ranges
CHECK: Name: .debug_macinfo
CHECK: Name: .debug_addr
CHECK: Name: .debug_pubnames
CHECK: Name: .debug_pubtypes
CHECK: Name: .comment
CHECK: Name: .note.GNU-stack
CHECK: Name: .debug_frame
CHECK: Name: .debug_line
CHECK: Name: .symtab
CHECK: Name: .rela.text
CHECK: Name: .rela.debug_info
CHECK: Name: .rela.debug_addr
CHECK: Name: .rela.debug_pubnames
CHECK: Name: .rela.debug_pubtypes
CHECK: Name: .rela.debug_frame
CHECK: Name: .rela.debug_line
CHECK: Name: .strtab

8
llvm/tools/llvm-objcopy/llvm-objcopy.cpp
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@ -72,8 +72,8 @@ LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, Error E) {
} // end namespace llvm
static cl::opt<std::string> InputFilename(cl::Positional, cl::desc("<input>"));
static cl::opt<std::string> OutputFilename(cl::Positional, cl::desc("<output>"),
cl::init("-"));
static cl::opt<std::string> OutputFilename(cl::Positional, cl::desc("[ <output> ]"));
static cl::opt<std::string>
OutputFormat("O", cl::desc("Set output format to one of the following:"
"\n\tbinary"));
@ -340,7 +340,9 @@ int main(int argc, char **argv) {
auto Reader = CreateReader();
auto Obj = Reader->create();
auto Writer = CreateWriter(*Obj, OutputFilename);
StringRef Output =
OutputFilename.getNumOccurrences() ? OutputFilename : InputFilename;
auto Writer = CreateWriter(*Obj, Output);
HandleArgs(*Obj, *Reader);
Writer->finalize();
Writer->write();