configure.ac: factor out detection for old and buggy llvm

As of LLVM 3.9 one could use consistent ways to handle the component.
Factor out the current handling, as it will be used for older versions.

Cc: mesa-stable@lists.freedesktop.org
Cc: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Tobias Droste <tdroste@gmx.de>

diff --git a/configure.ac b/configure.ac
index 898eebf3e0af978c9f183385109dc348d80be985..c25b4e20b7c8bf4c6dbe478dcf9d740d858a0d92 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -2642,6 +2642,39 @@ if test "x$HAVE_GALLIUM_VC4" != xyes -a "x$HAVE_GALLIUM_PL111" = xyes  ; then
     AC_MSG_ERROR([Building with pl111 requires vc4])
 fi
 
+
+detect_old_buggy_llvm() {
+    dnl llvm-config may not give the right answer when llvm is a built as a
+    dnl single shared library, so we must work the library name out for
+    dnl ourselves.
+    dnl (See https://llvm.org/bugs/show_bug.cgi?id=6823)
+    dnl We can't use $LLVM_VERSION because it has 'svn' stripped out,
+    LLVM_SO_NAME=LLVM-`$LLVM_CONFIG --version`
+    AS_IF([test -f "$LLVM_LIBDIR/lib$LLVM_SO_NAME.$IMP_LIB_EXT"], [llvm_have_one_so=yes])
+
+    if test "x$llvm_have_one_so" = xyes; then
+        dnl LLVM was built using auto*, so there is only one shared object.
+        LLVM_LIBS="-l$LLVM_SO_NAME"
+    else
+        dnl If LLVM was built with CMake, there will be one shared object per
+        dnl component.
+        AS_IF([test ! -f "$LLVM_LIBDIR/libLLVMTarget.$IMP_LIB_EXT"],
+               [AC_MSG_ERROR([Could not find llvm shared libraries:
+                Please make sure you have built llvm with the --enable-shared option
+                and that your llvm libraries are installed in $LLVM_LIBDIR
+                If you have installed your llvm libraries to a different directory you
+                can use the --with-llvm-prefix= configure flag to specify this directory.
+                NOTE: Mesa is attempting to use llvm shared libraries by default.
+                If you do not want to build with llvm shared libraries and instead want to
+                use llvm static libraries then add --disable-llvm-shared-libs to your configure
+                invocation and rebuild.])])
+
+        dnl We don't need to update LLVM_LIBS in this case because the LLVM
+        dnl install uses a shared object for each component and we have
+        dnl already added all of these objects to LLVM_LIBS.
+    fi
+}
+
 dnl
 dnl Set defines and buildtime variables only when using LLVM.
 dnl
@@ -2663,35 +2696,7 @@ if test "x$enable_llvm" = xyes; then
 
     if test "x$enable_llvm_shared_libs" = xyes; then
         if test $LLVM_VERSION_MAJOR -lt 4 -o "`$LLVM_CONFIG --shared-mode ${LLVM_COMPONENTS}`" = static; then
-            dnl llvm-config may not give the right answer when llvm is a built as a
-            dnl single shared library, so we must work the library name out for
-            dnl ourselves.
-            dnl (See https://llvm.org/bugs/show_bug.cgi?id=6823)
-            dnl We can't use $LLVM_VERSION because it has 'svn' stripped out,
-            LLVM_SO_NAME=LLVM-`$LLVM_CONFIG --version`
-            AS_IF([test -f "$LLVM_LIBDIR/lib$LLVM_SO_NAME.$IMP_LIB_EXT"], [llvm_have_one_so=yes])
-
-            if test "x$llvm_have_one_so" = xyes; then
-               dnl LLVM was built using auto*, so there is only one shared object.
-               LLVM_LIBS="-l$LLVM_SO_NAME"
-            else
-                dnl If LLVM was built with CMake, there will be one shared object per
-                dnl component.
-                AS_IF([test ! -f "$LLVM_LIBDIR/libLLVMTarget.$IMP_LIB_EXT"],
-                      [AC_MSG_ERROR([Could not find llvm shared libraries:
-                       Please make sure you have built llvm with the --enable-shared option
-                       and that your llvm libraries are installed in $LLVM_LIBDIR
-                       If you have installed your llvm libraries to a different directory you
-                       can use the --with-llvm-prefix= configure flag to specify this directory.
-                       NOTE: Mesa is attempting to use llvm shared libraries by default.
-                       If you do not want to build with llvm shared libraries and instead want to
-                       use llvm static libraries then add --disable-llvm-shared-libs to your configure
-                       invocation and rebuild.])])
-
-                dnl We don't need to update LLVM_LIBS in this case because the LLVM
-                dnl install uses a shared object for each component and we have
-                dnl already added all of these objects to LLVM_LIBS.
-            fi
+            detect_old_buggy_llvm
         fi
     else
         AC_MSG_WARN([Building mesa with statically linked LLVM may cause compilation issues])