set a min target architecture of pentium4 to require support for sse2…

… and _mm_pause

.travis.yml

@@ -32,6 +32,7 @@ before_install:
         sudo add-apt-repository ppa:staticfloat/julia-deps -y;
         sudo apt-get update -qq -y;
         if [ "$ARCH" = "i686" ]; then
+          export BUILDOPTS="$BUILDOPTS MARCH=pentium4";
           sudo apt-get remove libblas3gf liblapack3gf libarmadillo2 -y;
           sudo apt-get install binutils:i386 -y;
           sudo apt-get install gcc:i386 g++:i386 make:i386 cpp:i386 g++-4.6:i386 gcc-4.6:i386 libssl-dev:i386 patchelf:i386 gfortran:i386 llvm-3.3-dev:i386 libsuitesparse-dev:i386 libopenblas-dev:i386 libopenblas-base:i386 libblas-dev:i386 liblapack-dev:i386 liblapack3:i386 libarpack2-dev:i386 libarpack2:i386 libfftw3-dev:i386 libgmp-dev:i386 libpcre3-dev:i386 libunwind7-dev:i386 libopenlibm-dev:i386 libmpfr-dev:i386 -y;

Make.inc

@@ -379,6 +379,8 @@ DEBUGFLAGS := -O0 -g -DJL_DEBUG_BUILD -fstack-protector-all
 SHIPFLAGS := -O3 -g -falign-functions
 endif
 
+JCPPFLAGS += -ftls-model=global-dynamic
+
 ifeq ($(USECCACHE), 1)
 # expand CC and CXX at declaration time because we will redefine them
 CC_ARG   := $(CC)         # Expand CC and CXX here already because we want
@@ -497,6 +499,8 @@ else
 ifneq ($(XC_HOST),)
 XC_HOST := $(ARCH)$(shell echo $(XC_HOST) | sed "s/[^-]*\(.*\)$$/\1/")
 MARCH := $(subst _,-,$(ARCH))
+else # insert ARCH into HOST
+XC_HOST := $(ARCH)$(shell echo $(BUILD_MACHINE) | sed "s/[^-]*\(.*\)$$/\1/")
 endif
 endif
 
@@ -528,6 +532,18 @@ ARCH := $(BUILD_OS)
 endif
 endif
 
+# Detect common pre-SSE2 JULIA_CPU_TARGET values known not to work (#7185)
+ifeq ($(MARCH),)
+ifneq ($(findstring $(ARCH),i386 i486 i586 i686),)
+MARCH := pentium4
+endif
+endif
+
+ifneq ($(findstring $(MARCH),i386 i486 i586 i686 pentium pentium2 pentium3),)
+$(error Pre-SSE2 CPU targets not supported. To create a generic 32-bit x86 binary, \
+pass 'MARCH=pentium4'.)
+endif
+
 ifneq ($(MARCH),)
 CC += -march=$(MARCH)
 CXX += -march=$(MARCH)
@@ -551,12 +567,6 @@ endif
 
 JULIA_CPU_TARGET ?= native
 
-# Detect common pre-SSE2 JULIA_CPU_TARGET values known not to work (#7185)
-ifneq ($(findstring $(JULIA_CPU_TARGET),i386 i486 i586 i686 pentium pentium2 pentium3),)
-$(error Pre-SSE2 CPU targets not supported. To create a generic 32-bit x86 binary, \
-pass 'MARCH=i686 JULIA_CPU_TARGET=pentium4', or 'MARCH=pentium4' if not building any dependencies.)
-endif
-
 # We map amd64 to x86_64 for compatibility with systems that identify 64-bit systems as such
 ifeq ($(ARCH),amd64)
 override ARCH := x86_64

contrib/windows/msys_build.sh

@@ -62,8 +62,7 @@ else
   bits=32
   archsuffix=86
   exc=sjlj
-  echo "override MARCH = i686" >> Make.user
-  echo "override JULIA_CPU_TARGET = pentium4" >> Make.user
+  echo "override MARCH = pentium4" >> Make.user
   echo 'LIBBLAS = -L$(JULIAHOME)/usr/bin -lopenblas' >> Make.user
   echo 'LIBBLASNAME = libopenblas' >> Make.user
 fi

src/codegen.cpp

@@ -6014,8 +6014,8 @@ extern "C" void jl_init_codegen(void)
         .setMCJITMemoryManager(std::move(std::unique_ptr<RTDyldMemoryManager>{new SectionMemoryManager()}))
 #endif
         .setTargetOptions(options)
-        .setRelocationModel(Reloc::PIC_)
-        .setCodeModel(CodeModel::Small)
+        .setRelocationModel(Reloc::Default)
+        .setCodeModel(CodeModel::JITDefault)
 #ifdef DISABLE_OPT
         .setOptLevel(CodeGenOpt::None)
 #else