[patch] Support LLVM 7

[Christoph Berg]

LLVM 7 landed in Debian unstable, this patch teaches ./configure to use
it. (General patch, not specific to Debian.)

Christoph

>From 19afeadb2491b09e6856ef8010fecbe688cb6042 Mon Sep 17 00:00:00 2001
From: Christoph Berg <christoph.b...@credativ.de>
Date: Wed, 12 Sep 2018 14:41:39 +0200
Subject: [PATCH] Support LLVM 7

Upstream moved to single-number versions for naming binaries, it's
llvm-config-7 and clang-7 now.
---
 config/llvm.m4 | 4 ++--
 configure      | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/config/llvm.m4 b/config/llvm.m4
index 7d81ac0b99..926d684ed1 100644
--- a/config/llvm.m4
+++ b/config/llvm.m4
@@ -13,7 +13,7 @@ AC_DEFUN([PGAC_LLVM_SUPPORT],
   AC_REQUIRE([AC_PROG_AWK])
 
   AC_ARG_VAR(LLVM_CONFIG, [path to llvm-config command])
-  PGAC_PATH_PROGS(LLVM_CONFIG, llvm-config llvm-config-6.0 llvm-config-5.0 llvm-config-4.0 llvm-config-3.9)
+  PGAC_PATH_PROGS(LLVM_CONFIG, llvm-config llvm-config-7 llvm-config-6.0 llvm-config-5.0 llvm-config-4.0 llvm-config-3.9)
 
   # no point continuing if llvm wasn't found
   if test -z "$LLVM_CONFIG"; then
@@ -31,7 +31,7 @@ AC_DEFUN([PGAC_LLVM_SUPPORT],
 
   # need clang to create some bitcode files
   AC_ARG_VAR(CLANG, [path to clang compiler to generate bitcode])
-  PGAC_PATH_PROGS(CLANG, clang clang-6.0 clang-5.0 clang-4.0 clang-3.9)
+  PGAC_PATH_PROGS(CLANG, clang clang-7 clang-6.0 clang-5.0 clang-4.0 clang-3.9)
   if test -z "$CLANG"; then
     AC_MSG_ERROR([clang not found, but required when compiling --with-llvm, specify with CLANG=])
   fi
diff --git a/configure b/configure
index dd77742c46..c6a44a9078 100755
--- a/configure
+++ b/configure
@@ -4995,7 +4995,7 @@ done
 
 
   if test -z "$LLVM_CONFIG"; then
-  for ac_prog in llvm-config llvm-config-6.0 llvm-config-5.0 llvm-config-4.0 llvm-config-3.9
+  for ac_prog in llvm-config llvm-config-7 llvm-config-6.0 llvm-config-5.0 llvm-config-4.0 llvm-config-3.9
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
@@ -5066,7 +5066,7 @@ fi
   # need clang to create some bitcode files
 
   if test -z "$CLANG"; then
-  for ac_prog in clang clang-6.0 clang-5.0 clang-4.0 clang-3.9
+  for ac_prog in clang clang-7 clang-6.0 clang-5.0 clang-4.0 clang-3.9
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
-- 
2.19.0