[PATCH] D80880: [clang] [MinGW] Link kernel32 once after the last instance of msvcrt

[Martin Storsjö via Phabricator via cfe-commits]

mstorsjo created this revision.
mstorsjo added reviewers: jacek, mati865, amccarth, rnk.
Herald added a project: clang.

The msvcrt library isn't a pure import library; it does contain regular object files with wrappers/fallbacks, and these can require linking against kernel32.

This only makes a difference when linking with ld.bfd, as lld always searches all static libraries.

This matches a similar change made recently in gcc in https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=850533ab160ef40eccfd039e1e3b138cf26e76b8, although clang adds --start-group --end-group around these libraries if -static is specified, which gcc doesn't. But try to match gcc's linking order in any case, for consistency.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D80880

Files:
  clang/lib/Driver/ToolChains/MinGW.cpp
  clang/test/Driver/mingw-msvcrt.c


Index: clang/test/Driver/mingw-msvcrt.c
===================================================================
--- clang/test/Driver/mingw-msvcrt.c
+++ clang/test/Driver/mingw-msvcrt.c
@@ -4,6 +4,7 @@
 // RUN: %clang -v -target i686-pc-windows-gnu -lucrt -### %s 2>&1 | FileCheck -check-prefix=CHECK_UCRT %s
 
 // CHECK_DEFAULT: "-lmingwex" "-lmsvcrt" "-ladvapi32"
+// CHECK_DEFAULT-SAME: "-lmsvcrt" "-lkernel32" "{{.*}}crtend.o"
 // CHECK_MSVCR120: "-lmsvcr120"
 // CHECK_MSVCR120-SAME: "-lmingwex" "-ladvapi32"
 // CHECK_UCRTBASE: "-lucrtbase"
Index: clang/lib/Driver/ToolChains/MinGW.cpp
===================================================================
--- clang/lib/Driver/ToolChains/MinGW.cpp
+++ clang/lib/Driver/ToolChains/MinGW.cpp
@@ -310,10 +310,13 @@
         CmdArgs.push_back("-lkernel32");
       }
 
-      if (Args.hasArg(options::OPT_static))
+      if (Args.hasArg(options::OPT_static)) {
         CmdArgs.push_back("--end-group");
-      else
+      } else {
         AddLibGCC(Args, CmdArgs);
+        if (!HasWindowsApp)
+          CmdArgs.push_back("-lkernel32");
+      }
     }
 
     if (!Args.hasArg(options::OPT_nostartfiles)) {


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D80880.267480.patch
Type: text/x-patch
Size: 1156 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20200530/29cb2ea3/attachment.bin>