Bug#996956: libbenchmark-dev: libbenchmark_main.a has no actual object code

[Timo Röhling]

On Thu, 21 Oct 2021 12:37:55 +0200 Timo =?utf-8?Q?R=C3=B6hling?= <roehling at debian.org> wrote:
> -    add_cxx_compiler_flag(-flto)
> +    add_cxx_compiler_flag(-ffat-lto-objects)

I just saw https://salsa.debian.org/science-team/benchmark/-/merge_requests/2
Reading the documentation again, I think *both* options are
required:

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e6b2b81..bc06d52 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -215,7 +215,7 @@ else()
  
    # Link time optimisation
    if (BENCHMARK_ENABLE_LTO)
-    add_cxx_compiler_flag(-flto)
+    add_cxx_compiler_flag(-flto -ffat-lto-objects)
      add_cxx_compiler_flag(-Wno-lto-type-mismatch)
      if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
        find_program(GCC_AR gcc-ar)


I can confirm that this still fixes the linker issue for non-LTO
builds.

Cheers
Timo

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⣾⠁⢠⠒⠀⣿⡁   │ Timo Röhling                                       │
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