Record GCC-style command-line switches by default

This makes Clang default behaviour more like GCC where if debug
symbol generation is enabled, the command-line switches data
will be stored inside the debug symbols.

debian/changelog

@@ -1,3 +1,11 @@
+llvm-toolchain-18 (1:18.1.8-2~exp2) UNRELEASED; urgency=medium
+
+  [ Zixing Liu <zixing.liu@canonical.com> ]
+  * d/p/clang-record-gcc-switches-by-default.patch: add a patch to force clang
+    record gcc switches by default
+
+ -- Gianfranco Costamagna <locutusofborg@debian.org>  Wed, 03 Jul 2024 08:05:35 +0200
+
 llvm-toolchain-18 (1:18.1.8-2~exp1) experimental; urgency=medium
 
   [ Sylvestre Ledru ]

debian/patches/clang-record-gcc-switches-by-default.patch

@@ -0,0 +1,22 @@
+Description: Record GCC-style command-line switches by default
+ This makes Clang default behaviour more like GCC where if debug
+ symbol generation is enabled, the command-line switches data
+ will be stored inside the debug symbols.
+Author: Zixing Liu <zixing.liu@canonical.com>
+Forwarded: https://github.com/llvm/llvm-project/issues/94690
+Last-Update: 2024-06-04
+---
+This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
+Index: llvm-toolchain-18-18.1.6/clang/lib/Driver/ToolChains/Clang.cpp
+===================================================================
+--- llvm-toolchain-18-18.1.6.orig/clang/lib/Driver/ToolChains/Clang.cpp
++++ llvm-toolchain-18-18.1.6/clang/lib/Driver/ToolChains/Clang.cpp
+@@ -7390,7 +7390,7 @@ void Clang::ConstructJob(Compilation &C,
+   // By default, -gno-record-gcc-switches is set on and no recording.
+   auto GRecordSwitches =
+       Args.hasFlag(options::OPT_grecord_command_line,
+-                   options::OPT_gno_record_command_line, false);
++                   options::OPT_gno_record_command_line, true);
+   auto FRecordSwitches =
+       Args.hasFlag(options::OPT_frecord_command_line,
+                    options::OPT_fno_record_command_line, false);

debian/patches/series

@@ -151,3 +151,4 @@ arm32-defaults.diff
 mips/D154390-pre-R6.diff
 libsanitizer-timebits.diff
 ubuntu-releases.patch
+clang-record-gcc-switches-by-default.patch