diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 0ebe94576..1532609f3 100644 --- a/configure.ac +++ b/configure.ac @@ -855,12 +855,30 @@ if test x$with_tesseract != xno; then elif test x$SYNC = xnosync ; then AC_MSG_ERROR([Threading disabled or not available. Tesseract OCR relies on threading. Rerun configure with "--without-tesseract" to exclude OCR from the build]) else + + save_cxxflags="$CXXFLAGS" + cxxflags_to_try="-std=c++17 -stdlib=libstdc++" + CXXFLAGS_TO_USE="" + + AC_MSG_CHECKING([supported C++ compiler flags]) + for flag in $cxxflags_to_try ; do + CXXFLAGS="$CXXFLAGS $flag" + + AC_TRY_COMPILE(, [return 0;], [ + echo " $flag"; CXXFLAGS_TO_USE="$CXXFLAGS_TO_USE $flag" + ]) + + CXXFLAGS="$old_cflags" + done + + CXXFLAGS="$save_cxxflags $CXXFLAGS_TO_USE" + dnl -------------------------------------------------- dnl check for sse4.1, avx, avx2 or fma dnl -------------------------------------------------- AC_MSG_CHECKING([sse4.1 support]) save_cxxflags=$CXXFLAGS - TESS_CXXFLAGS="" + TESS_CXXFLAGS="$CXXFLAGS" CXXFLAGS="$CXXFLAGS -msse4.1" TESS_SSE4_1="" |