Question on building a local PGO build with optimization disabled

[Arthur Wang]

Hi, Build team

I am trying to build a local PGO build with optimization disabled (primary `-O0`, `-fno-inline`, `-fno-optimize-sibling-calls`, and get rid of `-ffvisibility-inlines-hidden`). This helps me evaluate a test execution on a temporal PGO build that generates the same data traces as a llvm build. 

I ran into one linker error: https://paste.googleplex.com/5962717573939200

However, the code should be pulling in from `content/browser/profiling_utils.cc`, and the .o file presents on my local disk

```
./out/coverage/obj/content/browser/browser/profiling_utils.o
./out/coverage/obj/content/browser/browser/profiling_utils.dwo

```

the source should be included in https://source.chromium.org/chromium/chromium/src/+/main:content/browser/BUILD.gn;l=3551

Wonder how I plug that in to make the link error go away.

Thanks!

--

Arthur Wang

SWE @Browser Test Infrastructure

[Arthur Wang]

My gn args is https://paste.googleplex.com/6739153440210944

My local patched cl is: https://chromium-review.googlesource.com/c/chromium/src/+/5789531

Thanks!

--

Arthur Wang

SWE @Browser Test Infrastructure

[Arthur Wang]

I got it working after apply these two gn args:

• use_thin_lto = true
• is_debug = false

Thanks!

--

Arthur Wang

SWE @Browser Test Infrastructure