[PATCH] D81545: [cmake] Don't pass -z discard-unused to Illumos ld

[Rainer Orth via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG2feb72bcd58c: [cmake] Don't pass -z discard-unused to Illumos ld (authored by ro).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D81545/new/

https://reviews.llvm.org/D81545

Files:
  llvm/cmake/modules/AddLLVM.cmake


Index: llvm/cmake/modules/AddLLVM.cmake
===================================================================
--- llvm/cmake/modules/AddLLVM.cmake
+++ llvm/cmake/modules/AddLLVM.cmake
@@ -240,8 +240,14 @@
         set_property(TARGET ${target_name} APPEND_STRING PROPERTY
                      LINK_FLAGS " -Wl,-dead_strip")
       elseif(${CMAKE_SYSTEM_NAME} MATCHES "SunOS")
-        set_property(TARGET ${target_name} APPEND_STRING PROPERTY
-                     LINK_FLAGS " -Wl,-z -Wl,discard-unused=sections")
+        # Support for ld -z discard-unused=sections was only added in
+        # Solaris 11.4.
+        include(CheckLinkerFlag)
+        check_linker_flag("-Wl,-z,discard-unused=sections" LINKER_SUPPORTS_Z_DISCARD_UNUSED)
+        if (LINKER_SUPPORTS_Z_DISCARD_UNUSED)
+          set_property(TARGET ${target_name} APPEND_STRING PROPERTY
+                       LINK_FLAGS " -Wl,-z,discard-unused=sections")
+        endif()
       elseif(NOT WIN32 AND NOT LLVM_LINKER_IS_GOLD AND
              NOT ${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD|AIX")
         # Object files are compiled with -ffunction-data-sections.


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