From 0f94f61805d53fc19b97291b7cfd400e4c4e513a Mon Sep 17 00:00:00 2001
From: redfish <redfish@galactica.pw>
Date: Wed, 31 Aug 2016 22:21:22 -0400
Subject: [PATCH] cmake: handle dists which prefix gcc binaries wth arch
 triplet

Issue #1026
---
 CMakeLists.txt | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ff159086..e280826c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -417,8 +417,18 @@ else()
     endif()
     # Since gcc 4.9 the LTO format is non-standard (slim), so we need the gcc-specific ar and ranlib binaries
     if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9.0) AND NOT OPENBSD)
-      set(CMAKE_AR "gcc-ar")
-      set(CMAKE_RANLIB "gcc-ranlib")
+      # When invoking cmake on distributions on which gcc's binaries are prefix
+      # with an arch-specific triplet, the user has to either specify
+      # -DCHOST=... or -DCMAKE_AR=... and -DCMAKE_RANLIB=...
+      if (DEFINED CHOST)
+        set(CHOST_PREFIX "${CHOST}-")
+      endif()
+      if (NOT DEFINED CMAKE_AR)
+        set(CMAKE_AR "${CHOST_PREFIX}gcc-ar")
+      endif()
+      if (NOT DEFINED CMAKE_RANLIB)
+        set(CMAKE_RANLIB "${CHOST_PREFIX}gcc-ranlib")
+      endif()
     endif()
   endif()