re PR tree-optimization/63747 (icf mis-compares switch gimple)

[gcc.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index b62af38e7a25f2cf13425a94ef96b2244cc81c56..2f0af4a836f43c0f847055eb6674b316a6a6a4b0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -769,10 +769,11 @@ case "${target}" in
     ;;
   *-*-lynxos*)
     noconfigdirs="$noconfigdirs ${libgcj}"
-    ;; 
+    ;;
 esac
 
-# Disable the go frontend on systems where it is known to not work.
+# Disable the go frontend on systems where it is known to not work. Please keep
+# this in sync with contrib/config-list.mk.
 case "${target}" in
 *-*-darwin* | *-*-cygwin* | *-*-mingw* | *-*-aix*)
     unsupported_languages="$unsupported_languages go"
@@ -1852,7 +1853,6 @@ if test -d ${srcdir}/gcc; then
   new_enable_languages=,c,
 
   # If LTO is enabled, add the LTO front end.
-  extra_host_libiberty_configure_flags=
   if test "$enable_lto" = "yes" ; then
     case ,${enable_languages}, in
       *,lto,*) ;;
@@ -1860,10 +1860,8 @@ if test -d ${srcdir}/gcc; then
     esac
     if test "${build_lto_plugin}" = "yes" ; then
       configdirs="$configdirs lto-plugin"
-      extra_host_libiberty_configure_flags=--enable-shared
     fi
   fi
-  AC_SUBST(extra_host_libiberty_configure_flags)
 
   missing_languages=`echo ",$enable_languages," | sed -e s/,all,/,/ -e s/,c,/,/ `
   potential_languages=,c,
@@ -2177,6 +2175,17 @@ then
   esac
 fi
 
+# Sometimes we have special requirements for the host libiberty.
+extra_host_libiberty_configure_flags=
+case " $configdirs " in
+  *" lto-plugin "* | *" libcc1 "*)
+    # When these are to be built as shared libraries, the same applies to
+    # libiberty.
+    extra_host_libiberty_configure_flags=--enable-shared
+    ;;
+esac
+AC_SUBST(extra_host_libiberty_configure_flags)
+
 # Produce a warning message for the subdirs we can't configure.
 # This isn't especially interesting in the Cygnus tree, but in the individual
 # FSF releases, it's important to let people know when their machine isn't