Include ARGV[0] in error messages.

[ruiu]

Summary

This is what other linkers and clang driver do.

[davide]

This seems sensible.

[ruiu]

Thanks. I'll wait for Eugene for a while as this is the place he updated today.

[evgeny777]

Yes this seems to be valid for everything except undefined symbol errors, but I'm working on it now. LGTM.

[ruiu]

Do you mean you don't want ARGV[0] for undefined symbol errors?

ELF/Driver.cpp

 using namespace lld::elf;
 
 Configuration *elf::Config;
 LinkerDriver *elf::Driver;
 
 bool elf::link(ArrayRef<const char *> Args, raw_ostream &Error) {
   HasError = false;
   ErrorOS = &Error;
+  Argv0 = Args[0];
 
   Configuration C;
   LinkerDriver D;
   ScriptConfiguration SC;
   Config = &C;
   Driver = &D;
   ScriptConfig = &SC;
 

ELF/Error.h

 
 #include "llvm/Support/Error.h"
 
 namespace lld {
 namespace elf {
 
 extern bool HasError;
 extern llvm::raw_ostream *ErrorOS;
+extern llvm::StringRef Argv0;
 
 void log(const Twine &Msg);
 void warn(const Twine &Msg);
 
 void error(const Twine &Msg);
 void error(std::error_code EC, const Twine &Prefix);
 
 template <typename T> void error(const ErrorOr<T> &V, const Twine &Prefix) {

ELF/Error.cpp

 #include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
 
 namespace lld {
 
 bool elf::HasError;
 raw_ostream *elf::ErrorOS;
+StringRef elf::Argv0;
 
 void elf::log(const Twine &Msg) {
   if (Config->Verbose)
-    outs() << Msg << "\n";
+    outs() << Argv0 << ": " << Msg << "\n";
 }
 
 void elf::warn(const Twine &Msg) {
   if (Config->FatalWarnings)
     error(Msg);
   else
-    *ErrorOS << "warning: " << Msg << "\n";
+    *ErrorOS << Argv0 << ": warning: " << Msg << "\n";
 }
 
 void elf::error(const Twine &Msg) {
-  *ErrorOS << "error: " << Msg << "\n";
+  *ErrorOS << Argv0 << ": error: " << Msg << "\n";
   HasError = true;
 }
 
 void elf::error(std::error_code EC, const Twine &Prefix) {
   error(Prefix + ": " + EC.message());
 }
 
 void elf::fatal(const Twine &Msg) {
-  *ErrorOS << "error: " << Msg << "\n";
+  *ErrorOS << Argv0 << ": error: " << Msg << "\n";
   exit(1);
 }
 
 void elf::fatal(std::error_code EC, const Twine &Prefix) {
   fatal(Prefix + ": " + EC.message());
 }
 
 } // namespace lld

test/ELF/copy-rel-corrupted.s

 // RUN: llvm-mc %s -o %t.o -filetype=obj -triple=x86_64-pc-linux
 // RUN: llvm-mc %p/Inputs/copy-rel-corrupted.s -o %t2.o -filetype=obj -triple=x86_64-pc-linux
 // RUN: ld.lld %t2.o -o %t2.so -shared
-// RUN: not ld.lld %t.o %t2.so -o %t.exe 2>&1 | FileCheck %s --match-full-lines
+// RUN: not ld.lld %t.o %t2.so -o %t.exe 2>&1 | FileCheck %s
 
 // CHECK: error: cannot create a copy relocation for symbol x
 
 .global _start
 _start:
         call x

test/ELF/driver.test

 ## "--output=foo" is equivalent to "-o foo".
 # RUN: not ld.lld %t --output=/no/such/file 2>&1 | FileCheck -check-prefix=ERR7 %s
 # ERR7: failed to open /no/such/file
 
 ## "-output=foo" is equivalent to "-o utput=foo".
 # RUN: not ld.lld %t -output=/no/such/file 2>&1 | FileCheck -check-prefix=ERR8 %s
 # ERR8: failed to open utput=/no/such/file
 
+# RUN: not ld.lld 2>&1 | FileCheck -check-prefix=ERR9 %s
+# ERR9: ld.lld{{.*}}: error: no input files
+
 .globl _start
 _start:
   nop

test/ELF/entry.s

 # RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t1
 
 # RUN: ld.lld -e foobar %t1 -o %t2 2>&1 | FileCheck -check-prefix=WARN %s
 # RUN: llvm-readobj -file-headers %t2 | FileCheck -check-prefix=NOENTRY %s
-# RUN: ld.lld %t1 -o %t2 2>&1 | FileCheck -check-prefix=WARN2 %s --match-full-lines
+# RUN: ld.lld %t1 -o %t2 2>&1 | FileCheck -check-prefix=WARN2 %s
 
-# RUN: ld.lld -shared -e foobar %t1 -o %t2 2>&1 | FileCheck -check-prefix=WARN --match-full-lines %s
+# RUN: ld.lld -shared -e foobar %t1 -o %t2 2>&1 | FileCheck -check-prefix=WARN %s
 # RUN: ld.lld -shared --fatal-warnings -e entry %t1 -o %t2
 # RUN: ld.lld -shared --fatal-warnings %t1 -o %t2
 
 # RUN: ld.lld %t1 -o %t2 -e entry
 # RUN: llvm-readobj -file-headers %t2 | FileCheck -check-prefix=SYM %s
 # RUN: ld.lld %t1 --fatal-warnings -shared -o %t2 -e entry
 # RUN: llvm-readobj -file-headers %t2 | FileCheck -check-prefix=DSO %s
 # RUN: ld.lld %t1 -o %t2 --entry=4096

test/ELF/linkerscript/diagnostic.s

 # RUN: echo "UNKNOWN_TAG {" > %t.script
 # RUN: echo ".text : { *(.text) }" >> %t.script
 # RUN: echo ".keep : { *(.keep) }" >> %t.script
 # RUN: echo ".temp : { *(.temp) } }" >> %t.script
 # RUN: not ld.lld -shared %t -o %t1 --script %t.script > %t.log 2>&1
 # RUN: FileCheck -check-prefix=ERR6 %s < %t.log
 # ERR6:      line 1:
 # ERR6-NEXT: UNKNOWN_TAG {
-# RUN: grep '^error: ^' %t.log
+# RUN: grep 'error: ^' %t.log
 
 ## One more check that text of lines and pointer to 'bad' token are working ok.
 # RUN: echo "SECTIONS {" > %t.script
 # RUN: echo ".text : { *(.text) }" >> %t.script
 # RUN: echo ".keep : { *(.keep) }" >> %t.script
 # RUN: echo "boom .temp : { *(.temp) } }" >> %t.script
 # RUN: not ld.lld -shared %t -o %t1 --script %t.script > %t.log 2>&1
 # RUN: FileCheck -check-prefix=ERR7 %s < %t.log
 # ERR7:      line 4: malformed number: .temp
 # ERR7-NEXT: boom .temp : { *(.temp) } }
-# RUN: grep '^error:      ^' %t.log
+# RUN: grep 'error:      ^' %t.log