[commit: ghc] master: configure: Make sure we try all possible linkers (a10729f)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/a10729f028d7175980d9f65e22c9bb9a933461c2/ghc

>---------------------------------------------------------------

commit a10729f028d7175980d9f65e22c9bb9a933461c2
Author: Ben Gamari <bgamari.foss at gmail.com>
Date:   Wed Sep 27 15:30:18 2017 -0400

    configure: Make sure we try all possible linkers
    
    Previously if we had both ld.lld and ld.gold installed but a gcc which
    didn't support -fuse-ld=lld we would fail when trying ld.lld and fall
    immediately back to plain ld. Now we will try ld.gold as well. This was
    brought to light by #14280, where using ld.bfd resulted in a broken
    stage2 compiler.
    
    Test Plan: Configure
    
    Reviewers: angerman, hvr, austin
    
    Reviewed By: angerman
    
    Subscribers: rwbarton, thomie, erikd
    
    GHC Trac Issues: #14280
    
    Differential Revision: https://phabricator.haskell.org/D4038


>---------------------------------------------------------------

a10729f028d7175980d9f65e22c9bb9a933461c2
 aclocal.m4 | 59 +++++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 41 insertions(+), 18 deletions(-)

diff --git a/aclocal.m4 b/aclocal.m4
index 5425408..fb61e8d 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -2331,28 +2331,51 @@ AC_DEFUN([FIND_LD],[
       [],
       [enable_ld_override=yes])
 
-    if test "x$enable_ld_override" = "xyes"; then
-        TmpLd="$LD" # In case the user set LD
-        AC_CHECK_TARGET_TOOLS([TmpLd], [ld.lld ld.gold ld])
-
-        out=`$TmpLd --version`
-        case $out in
-          "GNU ld"*)   FP_CC_LINKER_FLAG_TRY(bfd, $2) ;;
-          "GNU gold"*) FP_CC_LINKER_FLAG_TRY(gold, $2) ;;
-          "LLD"*)      FP_CC_LINKER_FLAG_TRY(lld, $2) ;;
-          *) AC_MSG_NOTICE([unknown linker version $out]) ;;
-        esac
-        if test "z$$2" = "z"; then
-            AC_MSG_NOTICE([unable to convince '$CC' to use linker '$TmpLd'])
+    find_ld() {
+        # Make sure the user didn't specify LD manually.
+        if test "z$LD" != "z"; then
             AC_CHECK_TARGET_TOOL([LD], [ld])
-        else
-            LD="$TmpLd"
+            return
         fi
-   else
+
+        # Manually iterate over possible names since we want to ensure that, e.g.,
+        # if ld.lld is installed but gcc doesn't support -fuse-ld=lld, that we
+        # then still try ld.gold and -fuse-ld=gold.
+        for possible_ld in ld.lld ld.gold ld; do
+            TmpLd="" # In case the user set LD
+            AC_CHECK_TARGET_TOOL([TmpLd], [$possible_ld])
+            if test "x$TmpLd" = "x"; then continue; fi
+
+            out=`$TmpLd --version`
+            case $out in
+              "GNU ld"*)   FP_CC_LINKER_FLAG_TRY(bfd, $2) ;;
+              "GNU gold"*) FP_CC_LINKER_FLAG_TRY(gold, $2) ;;
+              "LLD"*)      FP_CC_LINKER_FLAG_TRY(lld, $2) ;;
+              *) AC_MSG_NOTICE([unknown linker version $out]) ;;
+            esac
+            if test "z$$2" = "z"; then
+                AC_MSG_NOTICE([unable to convince '$CC' to use linker '$TmpLd'])
+                # a terrible hack to prevent autoconf from caching the previous
+                # AC_CHECK_TARGET_TOOL result since next time we'll be looking
+                # for another ld variant.
+                $as_unset ac_cv_prog_ac_ct_TmpLd
+            else
+                LD="$TmpLd"
+                return
+            fi
+        done
+
+        # Fallback
         AC_CHECK_TARGET_TOOL([LD], [ld])
-   fi
+    }
+
+    if test "x$enable_ld_override" = "xyes"; then
+        find_ld
+    else
+        AC_CHECK_TARGET_TOOL([LD], [ld])
+    fi
 
-   CHECK_LD_COPY_BUG([$1])
+    CHECK_LD_COPY_BUG([$1])
 ])
 
 # LocalWords:  fi