* Try to fix the mipsel FTBFS (Closes: #877567)

I am trying the first option from the bug:
  - gsplit-dward on 32 bits archs
  - -g everywhere
  Many thanks to Adrian Bunk for that

debian/changelog

@@ -2,6 +2,11 @@ llvm-toolchain-5.0 (1:5.0-5) UNRELEASED; urgency=medium
 
   * Update of the copyright file (Closes: #878502)
     Thanks to Nicholas D Steeves for the work
+  * Try to fix the mipsel FTBFS (Closes: #877567)
+    I am trying the first option from the bug:
+    - gsplit-dward on 32 bits archs
+    - -g everywhere
+    Many thanks to Adrian Bunk for that
 
  -- Sylvestre Ledru <sylvestre@debian.org>  Thu, 19 Oct 2017 09:34:09 +0200
 

debian/rules

@@ -34,9 +34,9 @@ ifneq (,$(filter $(DEB_HOST_ARCH),powerpc powerpcspe))
 LDFLAGS_EXTRA += -latomic
 endif
 
-ENABLE_SPLIT_DWARF_ARCHS := armel armhf i386 mips powerpc
-# Only enable gsplit dwarf on archs which needs it
-ifneq (,$(filter $(DEB_HOST_ARCH),$(ENABLE_SPLIT_DWARF_ARCHS)))
+
+# Only enable gsplit dwarf on archs which needs it (32 bits)
+ifeq ($(DEB_HOST_ARCH_BITS),32)
 ifeq ($(shell dpkg --compare-versions $(shell dpkg-query -W -f '$${Version}' binutils) ge 2.22.52.0.4 ; echo $$?),0)
 # when using -gsplit-dwarf, it will requires extract-dwo which doesn't exist on precise:
 # More: https://llvm.org/bugs/show_bug.cgi?id=28841
@@ -45,7 +45,7 @@ ifeq ($(shell dpkg --compare-versions $(shell dpkg-query -W -f '$${Version}' g++
 # Only pass -gsplit-dwarf with working version of gcc 7
 # More: https://bugs.llvm.org/show_bug.cgi?id=34140 & https://bugs.debian.org/873609
 CXXFLAGS_EXTRA += -gsplit-dwarf
-else 
+else
 $(error "Broken gcc version for -gsplit-dwarf support. Please use < gcc 7 or >= 7.2.0-2")
 endif # < gcc 7 or >= 7.2.0-2
 endif # binutils
@@ -61,11 +61,6 @@ export CC=gcc-$(GCC_VERSION)
 export CXX=g++-$(GCC_VERSION)
 
 opt_flags = -O2 -DNDEBUG
-ifneq (,$(filter $(DEB_HOST_ARCH),amd64 arm64 ppc64el s390x))
-  opt_flags += -g1
-else
-  opt_flags += -g
-endif
 
 ifneq (,$(findstring $(DEB_HOST_ARCH),armel))
   opt_flags += -marm