Added GCC_ARCH option to manually set -march in GCC

CMakeLists.txt

@@ -54,6 +54,7 @@ configure_file(
 option(DisableMEX     "DisableMEX"     ON)
 option(StaticMKL      "StaticMKL"      OFF)
 option(DisableBladeRF "DisableBladeRF" OFF)
+set(GCC_ARCH native CACHE STRING "GCC compile for specific architecture.")
 
 ########################################################################
 # Install Dirs
@@ -101,24 +102,24 @@ endif(CMAKE_COMPILER_IS_GNUCXX)
 if(CMAKE_COMPILER_IS_GNUCC)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wno-write-strings -Wno-format-extra-args -Winline -Wno-unused-result -Wno-format -std=c99 -D_GNU_SOURCE -g")
 
+  find_package(SSE)
+
   if(${CMAKE_BUILD_TYPE} STREQUAL "Debug")
-    find_package(SSE)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O0")
     if(HAVE_AVX)
-      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=native -mfpmath=sse -mavx -DLV_HAVE_AVX -DLV_HAVE_SSE")      
+      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=${GCC_ARCH} -mfpmath=sse -mavx -DLV_HAVE_AVX -DLV_HAVE_SSE")
     elseif(HAVE_SSE)
-      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=native -mfpmath=sse -msse4.1 -DLV_HAVE_SSE")
+      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=${GCC_ARCH} -mfpmath=sse -msse4.1 -DLV_HAVE_SSE")
     endif(HAVE_AVX)
   else(${CMAKE_BUILD_TYPE} STREQUAL "Debug")
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O3")
-    find_package(SSE)
     if (HAVE_AVX2)
-      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=native -mfpmath=sse -mavx2 -Ofast -funroll-loops -DLV_HAVE_AVX -DLV_HAVE_SSE")
+      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=${GCC_ARCH} -mfpmath=sse -mavx2 -Ofast -funroll-loops -DLV_HAVE_AVX -DLV_HAVE_SSE")
     else (HAVE_AVX2)
       if(HAVE_AVX)
-        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=native -mfpmath=sse -mavx -Ofast -funroll-loops -DLV_HAVE_AVX -DLV_HAVE_SSE")
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=${GCC_ARCH} -mfpmath=sse -mavx -Ofast -funroll-loops -DLV_HAVE_AVX -DLV_HAVE_SSE")
       elseif(HAVE_SSE)
-        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=native -mfpmath=sse -msse4.1 -Ofast -funroll-loops -DLV_HAVE_SSE")
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=${GCC_ARCH} -mfpmath=sse -msse4.1 -Ofast -funroll-loops -DLV_HAVE_SSE")
       endif(HAVE_AVX)
     endif (HAVE_AVX2)
     

cmake/modules/FindSSE.cmake

@@ -1,9 +1,9 @@
 
 include(CheckCSourceRuns)
 
-option(ENABLE_SSE "Enable compile-time SSE4.1 support." ON)
-option(ENABLE_AVX "Enable compile-time AVX support."  ON)
-option(ENABLE_AVX2 "Enable compile-time AVX2 support."  ON)
+option(ENABLE_SSE  "Enable compile-time SSE4.1 support." ON)
+option(ENABLE_AVX  "Enable compile-time AVX support."    ON)
+option(ENABLE_AVX2 "Enable compile-time AVX2 support."   ON)
 
 if (ENABLE_SSE)
     #
@@ -96,4 +96,4 @@ if (ENABLE_SSE)
 
 endif()
 
-mark_as_advanced(HAVE_SSE, HAVE_AVX, HAVE_AVX2)
+mark_as_advanced(HAVE_SSE, HAVE_AVX, HAVE_AVX2)