[PATCH] D92958: [gn build] Add gn arg to only emit line numbers for debug info

[Arthur Eubanks via Phabricator via llvm-commits]

aeubanks created this revision.
aeubanks added a reviewer: thakis.
aeubanks requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D92958

Files:
  llvm/utils/gn/build/BUILD.gn
  llvm/utils/gn/build/buildflags.gni


Index: llvm/utils/gn/build/buildflags.gni
===================================================================
--- llvm/utils/gn/build/buildflags.gni
+++ llvm/utils/gn/build/buildflags.gni
@@ -2,6 +2,9 @@
   # Whether to build with debug information.
   is_debug = false
 
+  # Whether to build with debug information only containing line info. Useful for stack traces.
+  is_debug_lines = false
+
   # Whether to build with tsan.
   use_tsan = false
 
Index: llvm/utils/gn/build/BUILD.gn
===================================================================
--- llvm/utils/gn/build/BUILD.gn
+++ llvm/utils/gn/build/BUILD.gn
@@ -72,9 +72,12 @@
     ldflags += [ "-mmacosx-version-min=10.10" ]
   }
 
+  assert(!(is_debug && is_debug_lines), "Cannot specify both is_debug and is_debug_lines")
   if (host_os != "win") {
     if (is_debug) {
       cflags += [ "-g" ]
+    } else if (is_debug_lines) {
+      cflags += [ "-g1" ]
     }
     if (is_optimized) {
       cflags += [ "-O3" ]
@@ -88,11 +91,14 @@
       "-fvisibility-inlines-hidden",
     ]
   } else {
-    if (is_debug) {
+    if (is_debug || is_debug_lines) {
       cflags += [
         "/Zi",
         "/FS",
       ]
+      if (is_debug_lines) {
+        cflags += [ "/Zd" ]
+      }
       ldflags += [ "/DEBUG" ]
 
       # Speed up links with ghash on windows.


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