Fix check of OpenEXR >= 3.0 library.

Add check if OpenEXR needs explicit C++ standard.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit f808f70c93)

configure.ac

@@ -415,7 +415,8 @@ fi
 # OPENEXR
 if test $sq_codec_openexr = yes; then
 
-PKG_CHECK_MODULES([OpenEXR], OpenEXR, [
+PKG_CHECK_MODULES([OpenEXR], OpenEXR,
+    [
         SQ_EXR_CFLAGS=$OpenEXR_CFLAGS
         SQ_EXR_LDFLAGS=$OpenEXR_LIBS
 
@@ -424,25 +425,53 @@ PKG_CHECK_MODULES([OpenEXR], OpenEXR, [
 
         CPPFLAGS="$SQ_EXR_CFLAGS $CPPFLAGS $USE_EXCEPTIONS"
         LDFLAGS="$LDFLAGS $SQ_EXR_LDFLAGS"
+        BASE_CPPFLAGS="$CPPFLAGS"
 
         AC_LANG_SAVE
         AC_LANG_CPLUSPLUS
 
-        AC_CHECK_HEADERS([OpenEXR/ImfRgbaFile.h], [
-		            AC_CHECK_LIB([IlmImf], [ImfInputFileName], [
-                                    sq_have_openexr="yes"
-                                    AC_SUBST(SQ_EXR_CFLAGS)
-                                    AC_SUBST(SQ_EXR_LDFLAGS)
-                                    ], [sq_have_openexr="no" missing OpenEXR libopenexr])
-		            ],
-		            [sq_have_openexr="no" missing OpenEXR libopenexr])
-        
+        AC_CHECK_HEADERS([OpenEXR/ImfRgbaFile.h],
+            [sq_have_openexr_headers="yes"],
+            [
+                for CXX_STD_TEST in 11 14 17; do
+                    AC_MSG_CHECKING([OpenEXR build with C++$CXX_STD_TEST])
+                    CPPFLAGS="$BASE_CPPFLAGS -std=c++$CXX_STD_TEST"
+                    $as_unset ac_cv_header_OpenEXR_ImfRgbaFile_h
+                    AC_CHECK_HEADERS([OpenEXR/ImfRgbaFile.h],
+                        [
+                            sq_have_openexr_headers="yes"
+                            SQ_EXR_CFLAGS+=" -std=c++$CXX_STD_TEST"
+                        ],
+                        [sq_have_openexr="no" missing OpenEXR libopenexr])
+                    if test x$sq_have_openexr_headers = xyes; then
+                        break
+                    fi
+                done
+            ])
+        if test x$sq_have_openexr_headers = xyes; then
+            AC_CHECK_LIB([OpenEXR], [ImfInputFileName],
+                [
+                    sq_have_openexr="yes"
+                    AC_SUBST(SQ_EXR_CFLAGS)
+                    AC_SUBST(SQ_EXR_LDFLAGS)
+                ],
+                [
+                    AC_CHECK_LIB([IlmImf], [ImfInputFileName],
+                        [
+                            sq_have_openexr="yes"
+                            AC_SUBST(SQ_EXR_CFLAGS)
+                            AC_SUBST(SQ_EXR_LDFLAGS)
+                        ],
+                        [sq_have_openexr="no" missing OpenEXR libopenexr])
+                ])
+        fi
+
         AC_LANG_RESTORE
 
         CPPFLAGS=$_cppflags
         LDFLAGS=$_ldflags
-                            ],
-                [sq_have_openexr="no" missing OpenEXR libopenexr])
+    ],
+    [sq_have_openexr="no" missing OpenEXR libopenexr])
 fi
 
 _cppflags=$CPPFLAGS

kernel/kls_openexr/Makefile.am

@@ -1,6 +1,6 @@
-CXXFLAGS = @CXXFLAGS@ -fexceptions
+CXXFLAGS = @CXXFLAGS@ -fexceptions @SQ_EXR_CFLAGS@
 
-INCLUDES = -I../include @SQ_EXR_CFLAGS@
+INCLUDES = -I../include
 
 pkglib_LTLIBRARIES = libkls_openexr.la