From f19f50f3c0249fca9c4419ea5f8e14a5c03508d0 Mon Sep 17 00:00:00 2001
From: Hans Ulrich Niedermann <hun@n-dimensional.de>
Date: Mon, 17 Feb 2020 02:13:09 +0100
Subject: travis-ci: Replace GP_CHECK_LIBRARY for libexif

---
 configure.ac | 96 ++++++++++++++++++++++++++++++++----------------------------
 1 file changed, 52 insertions(+), 44 deletions(-)

diff --git a/configure.ac b/configure.ac
index f03e8fa8a..b1f5d8151 100644
--- a/configure.ac
+++ b/configure.ac
@@ -602,21 +602,37 @@ dnl	     a file.
 dnl	     libexif is available from
 dnl	     http://www.sourceforge.net/projects/libexif
 dnl ---------------------------------------------------------------------------
-AC_MSG_CHECKING([checkpoint G])
-AC_MSG_RESULT([apparently])
-
-
-GP_CHECK_LIBRARY([LIBEXIF],[libexif],[>= 0.6.13],
-		 [libexif/exif-data.h],[exif_data_new],[
-AC_MSG_CHECKING([checkpoint H])
-AC_MSG_RESULT([apparently])
-
-AC_MSG_CHECKING([whether we use a version of libexif with ExifData.ifd[[]]])
-# Check for libexif version
-dnl FIXME: Use AC_CHECK_MEMBER?
-CPPFLAGS_save="$CPPFLAGS"
-CPPFLAGS="$LIBEXIF_CFLAGS"
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+have_LIBEXIF=yes
+PKG_CHECK_MODULES([LIBEXIF], [libexif >= 0.6.13],
+                  [], [have_LIBEXIF=no])
+
+AS_VAR_IF([have_LIBEXIF], [yes], [dnl
+  CPPFLAGS_save="$CPPFLAGS"
+  CPPFLAGS="${LIBEXIF_CFLAGS}"
+  AC_CHECK_HEADER([libexif/exif-data.h],[],[dnl
+    have_LIBEXIF=no
+  ])
+  CPPFLAGS="$CPPFLAGS_save"
+  AC_MSG_CHECKING([for working header libexif/exif-data.h])
+  AC_MSG_RESULT([${have_LIBEXIF}])
+
+  AS_VAR_IF([have_LIBEXIF], [yes], [dnl
+    AC_MSG_CHECKING([for function exif_data_new])
+    LIBS_save="$LIBS"
+    LIBS="${LIBEXIF_LIBS}"
+    AC_TRY_LINK_FUNC([exif_data_new],[AC_MSG_RESULT([yes])],[dnl
+      AC_MSG_RESULT([no])
+      have_LIBEXIF=no
+    ])
+    LIBS="$LIBS_save"
+
+    AS_VAR_IF([have_LIBEXIF], [yes], [dnl
+      AC_MSG_CHECKING([whether we use a version of libexif with ExifData.ifd[[]]])
+      # Check for libexif version
+      dnl FIXME: Use AC_CHECK_MEMBER?
+      CPPFLAGS_save="$CPPFLAGS"
+      CPPFLAGS="$LIBEXIF_CFLAGS"
+      AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 /* CC=$CC */
 /* CPPFLAGS=${CPPFLAGS} */
 /* LDFLAGS=${LDFLAGS} */
@@ -627,34 +643,34 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 	ExifContent *ec0, *ec1;
 	ec0 = &ed.ifd[0];
 	ec1 = &ed.ifd[1];
-]])], [
-   AC_DEFINE([HAVE_LIBEXIF_IFD],1,
-	     [whether we use a version of libexif with ExifData.ifd[[]]])
-   AC_MSG_RESULT([yes])
-   AC_MSG_CHECKING([checkpoint J])
-   AC_MSG_RESULT([apparently])
-], [
-   AC_MSG_RESULT([no])
-   AC_MSG_CHECKING([checkpoint K])
-   AC_MSG_RESULT([apparently])
+      ]])], [dnl
+        AC_DEFINE([HAVE_LIBEXIF_IFD],1,
+                  [whether we use a version of libexif with ExifData.ifd[[]]])
+        AC_MSG_RESULT([yes])
+      ], [dnl
+        AC_MSG_RESULT([no])
+        have_LIBEXIF=no
+      ])
+      CPPFLAGS="$CPPFLAGS_save"
+    ])
+  ])
+])
+
+AC_MSG_CHECKING([whether libexif is completely working for us])
+AC_MSG_RESULT([${have_LIBEXIF}])
+AM_CONDITIONAL([HAVE_LIBEXIF], [test "x$have_LIBEXIF" = "xyes"])
+AM_COND_IF([HAVE_LIBEXIF], [dnl
+  AC_DEFINE([HAVE_LIBEXIF], 1, [whether we compile with libexif support])
+  GP_CONFIG_MSG([libexif],[yes])dnl
+], [dnl
+  GP_CONFIG_MSG([libexif],[no])dnl
 ])
-CPPFLAGS="$CPPFLAGS_save"
-   AC_MSG_CHECKING([checkpoint L])
-   AC_MSG_RESULT([apparently])
-],[
-   AC_MSG_CHECKING([checkpoint M])
-   AC_MSG_RESULT([apparently])
-],[default-on],[http://www.sourceforge.net/projects/libexif])dnl
 
 
 dnl FIXME: Is this accurate?
 AM_CONDITIONAL([HAVE_CXX], [test -n "$CXX" && test "X$CXX" != "Xno"])
 
 
-AC_MSG_CHECKING([checkpoint A])
-AC_MSG_RESULT([apparently])
-
-
 dnl ---------------------------------------------------------------------------
 dnl Configure subprojects
 dnl ---------------------------------------------------------------------------
@@ -670,20 +686,12 @@ else
 fi
 
 
-AC_MSG_CHECKING([checkpoint B])
-AC_MSG_RESULT([apparently])
-
-
 # ---------------------------------------------------------------------------
 # clean up
 # ---------------------------------------------------------------------------
 GP_SET_CLEAN_FILES
 
 
-AC_MSG_CHECKING([checkpoint C])
-AC_MSG_RESULT([apparently])
-
-
 # ---------------------------------------------------------------------------
 # Create output files
 # ---------------------------------------------------------------------------
-- 
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