release/20.x: [flang][runtime] Make sure to link libexecinfo if it exists (#125344)

[llvmbot]

Backport cb2598d

Requested by: @brad0

[llvmbot]

@tblah What do you think about merging this PR to the release branch?

[llvmbot]

@llvm/pr-subscribers-flang-runtime

Author: None (llvmbot)

Changes

Backport cb2598d

Requested by: @brad0

---

Full diff: https://github.com/llvm/llvm-project/pull/125515.diff

1 Files Affected:

• (modified) flang/runtime/CMakeLists.txt (+7-2)

diff --git a/flang/runtime/CMakeLists.txt b/flang/runtime/CMakeLists.txt
index fbfaae9a8806486..bf27a121e4d174c 100644
--- a/flang/runtime/CMakeLists.txt
+++ b/flang/runtime/CMakeLists.txt
@@ -59,10 +59,15 @@ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
     )
 endif()
 
+set(linked_libraries FortranDecimal)
+
 # function checks
 find_package(Backtrace)
 set(HAVE_BACKTRACE ${Backtrace_FOUND})
 set(BACKTRACE_HEADER ${Backtrace_HEADER})
+if(HAVE_BACKTRACE)
+  list(APPEND linked_libraries ${Backtrace_LIBRARY})
+endif()
 
 include(CheckCXXSymbolExists)
 include(CheckCXXSourceCompiles)
@@ -271,7 +276,7 @@ if (NOT DEFINED MSVC)
   add_flang_library(FortranRuntime
     ${sources}
     LINK_LIBS
-    FortranDecimal
+    ${linked_libraries}
 
     INSTALL_WITH_TOOLCHAIN
   )
@@ -279,7 +284,7 @@ else()
   add_flang_library(FortranRuntime
     ${sources}
     LINK_LIBS
-    FortranDecimal
+    ${linked_libraries}
   )
   set(CMAKE_MSVC_RUNTIME_LIBRARY MultiThreaded)
   add_flang_library(FortranRuntime.static ${sources}

[github-actions]

@brad0 (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR.