From 02a6970cf361ae12e2e2b5374f87bd09b3802bfd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zdenko=20Podobn=C3=BD?= <zdenop@gmail.com>
Date: Fri, 23 Dec 2016 10:20:08 +0100
Subject: [PATCH] autotools: test if compiler support -mavx and -msse4.1

---
 arch/Makefile.am |  5 +++++
 configure.ac     | 12 ++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/arch/Makefile.am b/arch/Makefile.am
index bce98e7f..ba7f1a81 100644
--- a/arch/Makefile.am
+++ b/arch/Makefile.am
@@ -20,8 +20,13 @@ lib_LTLIBRARIES = libtesseract_avx.la libtesseract_sse.la
 libtesseract_avx_la_LDFLAGS = -version-info $(GENERIC_LIBRARY_VERSION)
 libtesseract_sse_la_LDFLAGS = -version-info $(GENERIC_LIBRARY_VERSION)
 endif
+
+if AVX_OPT
 libtesseract_avx_la_CXXFLAGS = -mavx
+endif
+if SSE41_OPT
 libtesseract_sse_la_CXXFLAGS = -msse4.1
+endif
 
 libtesseract_avx_la_SOURCES = dotproductavx.cpp
 
diff --git a/configure.ac b/configure.ac
index 70da75f3..4888da04 100644
--- a/configure.ac
+++ b/configure.ac
@@ -115,6 +115,18 @@ case "${host_os}" in
         ;;
 esac
 
+## Checks for supported compiler options.
+AM_CONDITIONAL([AVX_OPT], false)
+AM_CONDITIONAL([SSE41_OPT], false)
+AX_CHECK_COMPILE_FLAG([-mavx], [avx=1], [avx=0])
+AX_CHECK_COMPILE_FLAG([-msse4.1], [sse41=1], [sse41=0])
+if test x$avx = x1; then
+    AM_CONDITIONAL([AVX_OPT], true)
+fi
+if test x$sse41 = x1; then
+    AM_CONDITIONAL([SSE41_OPT], true)
+fi
+
 includedir="${includedir}/tesseract"
 
 AC_ARG_WITH([extra-includes],