Implement -frecord-command-line (-frecord-gcc-switches)

Implement options in clang to enable recording the driver command-line
in an ELF section.

Implement a new special named metadata, llvm.commandline, to support
frontends embedding their command-line options in IR/ASM/ELF.

This differs from the GCC implementation in some key ways:

* In GCC there is only one command-line possible per compilation-unit,
  in LLVM it mirrors llvm.ident and multiple are allowed.
* In GCC individual options are separated by NULL bytes, in LLVM entire
  command-lines are separated by NULL bytes. The advantage of the GCC
  approach is to clearly delineate options in the face of embedded
  spaces. The advantage of the LLVM approach is to support merging
  multiple command-lines unambiguously, while handling embedded spaces
  with escaping.

Differential Revision: https://reviews.llvm.org/D54487
Clang Differential Revision: https://reviews.llvm.org/D54489

llvm-svn: 349155

1 files changed, 10 insertions, 0 deletions

diff --git a/llvm/test/Verifier/commandline-meta2.ll b/llvm/test/Verifier/commandline-meta2.ll
new file mode 100644
index 00000000000..46eeb8cdf4e
--- /dev/null
+++ b/llvm/test/Verifier/commandline-meta2.ll
@@ -0,0 +1,10 @@
+; RUN: not llvm-as < %s -o /dev/null 2>&1 | FileCheck %s
+; Verify that llvm.commandline is properly structured.
+; llvm.commandline takes a list of metadata entries.
+; Each metadata entry can contain one string only.
+
+!llvm.commandline = !{!0}
+!0 = !{i32 1}
+; CHECK: assembly parsed, but does not verify as correct!
+; CHECK-NEXT: invalid value for llvm.commandline metadata entry operand(the operand should be a string)
+; CHECK-NEXT: i32 1