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Add "(compatible with GNU linkers)" to the -version output.

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Previous output:

  $ ld.lld -version
  LLD 5.0.0

New output:

  $ ld.lld -version
  LLD 5.0.0 (compatible with GNU linkers)

Differential Revision: https://reviews.llvm.org/D31199

llvm-svn: 298532
This commit is contained in:
Rui Ueyama
2017-03-22 18:04:57 +00:00
parent 9a3f97977f
commit bdc8bc047d
2 changed files with 22 additions and 6 deletions
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26
lld/ELF/Driver.cpp
View File

@@ -300,11 +300,27 @@ void LinkerDriver::main(ArrayRef<const char *> ArgsArr, bool CanExitEarly) {
return;
}
// GNU linkers disagree here. Though both -version and -v are mentioned
// in help to print the version information, GNU ld just normally exits,
// while gold can continue linking. We are compatible with ld.bfd here.
if (Args.hasArg(OPT_version) || Args.hasArg(OPT_v))
message(getLLDVersion());
// Handle -v or -version.
//
// A note about "compatible with GNU linkers" message: this is a hack for
// scripts generated by GNU Libtool 2.4.6 (released in February 2014 and
// still the newest version in March 2017) or earlier to recognize LLD as
// a GNU compatible linker. As long as an output for the -v option
// contains "GNU" or "with BFD", they recognize us as GNU-compatible.
//
// This is somewhat ugly hack, but in reality, we had no choice other
// than doing this. Considering the very long release cycle of Libtool,
// it is not easy to improve it to recognize LLD as a GNU compatible
// linker in a timely manner. Even if we can make it, there are still a
// lot of "configure" scripts out there that are generated by old version
// of Libtool. We cannot convince every software developer to migrate to
// the latest version and re-generate scripts. So we have this hack.
if (Args.hasArg(OPT_v) || Args.hasArg(OPT_version))
message(getLLDVersion() + " (compatible with GNU linkers)");
// ld.bfd always exits after printing out the version string.
// ld.gold proceeds if a given option is -v. Because gold's behavior
// is more permissive than ld.bfd, we chose what gold does here.
if (Args.hasArg(OPT_version))
return;

2
lld/test/ELF/driver.test
View File

@@ -17,7 +17,7 @@
# HELP: USAGE:
# RUN: ld.lld --version 2>&1 | FileCheck -check-prefix=VERSION %s
# VERSION: LLD
# VERSION: LLD {{.*}} (compatible with GNU linkers)
# RUN: not ld.lld -v 2>&1 | FileCheck -check-prefix=VERSION %s