fi
AC_SUBST(LIBJPEG)
-### Use -lpng if available, unless `--with-png=no'.
-### mingw32 doesn't use -lpng, since it loads the library dynamically.
-HAVE_PNG=no
-LIBPNG=
-if test "${opsys}" = "mingw32"; then
- if test "${with_png}" != "no"; then
- AC_CHECK_HEADER(png.h, HAVE_PNG=yes, HAVE_PNG=no)
- fi
- if test "${HAVE_PNG}" = "yes"; then
- AC_DEFINE(HAVE_PNG, 1, [Define to 1 if you have the png library (-lpng).])
-
- AC_CHECK_DECL(png_longjmp,
- [],
- [AC_DEFINE(PNG_DEPSTRUCT, [],
- [Define to empty to suppress deprecation warnings when building
- with --enable-gcc-warnings and with libpng versions before 1.5,
- which lack png_longjmp.])],
- [[#ifdef HAVE_LIBPNG_PNG_H
- # include <libpng/png.h>
- #else
- # include <png.h>
- #endif
- ]])
- fi
-elif test "${HAVE_X11}" = "yes" || test "${HAVE_W32}" = "yes"; then
- if test "${with_png}" != "no"; then
- # Debian unstable as of July 2003 has multiple libpngs, and puts png.h
- # in /usr/include/libpng.
- AC_CHECK_HEADERS(png.h libpng/png.h, break)
- if test "$ac_cv_header_png_h" = yes || test "$ac_cv_header_libpng_png_h" = yes ; then
- AC_CHECK_LIB(png, png_get_channels, HAVE_PNG=yes, , -lz -lm)
- fi
- fi
-
- if test "${HAVE_PNG}" = "yes"; then
- AC_DEFINE(HAVE_PNG, 1, [Define to 1 if you have the png library.])
-
- dnl Some systems, eg NetBSD 6, only provide eg "libpng16", not "libpng".
- lpng=`libpng-config --libs 2> /dev/null`
- case $lpng in
- -l*) : ;;
- *) lpng="-lpng" ;;
- esac
- LIBPNG="$lpng -lz -lm"
-
- AC_CHECK_DECL(png_longjmp,
- [],
- [AC_DEFINE(PNG_DEPSTRUCT, [],
- [Define to empty to suppress deprecation warnings when building
- with --enable-gcc-warnings and with libpng versions before 1.5,
- which lack png_longjmp.])],
- [[#ifdef HAVE_LIBPNG_PNG_H
- # include <libpng/png.h>
- #else
- # include <png.h>
- #endif
- ]])
- fi
-fi
-AC_SUBST(LIBPNG)
-
HAVE_ZLIB=no
LIBZ=
if test "${with_zlib}" != "no"; then
fi
AC_SUBST(LIBZ)
+### Use -lpng if available, unless `--with-png=no'.
+HAVE_PNG=no
+LIBPNG=
+PNG_CFLAGS=
+if test "${with_png}" != no; then
+ # mingw32 loads the library dynamically.
+ if test "$opsys" = mingw32; then
+ AC_CHECK_HEADER([png.h], [HAVE_PNG=yes])
+ elif png_cflags=`(libpng-config --cflags) 2>&AS_MESSAGE_LOG_FD` &&
+ png_libs=`(libpng-config --libs) 2>&AS_MESSAGE_LOG_FD`
+ then
+ HAVE_PNG=yes
+ PNG_CFLAGS=`AS_ECHO(["$png_cflags"]) | sed -e "$edit_cflags"`
+ LIBPNG=$png_libs
+ else
+ # libpng-config does not work; configure by hand.
+ # Debian unstable as of July 2003 has multiple libpngs, and puts png.h
+ # in /usr/include/libpng.
+ AC_CHECK_HEADERS([png.h libpng/png.h],
+ [AC_CHECK_LIB([png], [png_get_channels],
+ [HAVE_PNG=yes
+ LIBPNG='-lpng'
+ if test "$ac_cv_header_png_h" != yes; then
+ PNG_CFLAGS=-I/usr/include/libpng
+ fi
+ break],
+ [], [-lz -lm])])
+ fi
+ # $LIBPNG requires explicit -lz in some cases.
+ # We don't know what those cases are, exactly, so play it safe and
+ # append -lz to any nonempty $LIBPNG, unless we're already using LIBZ.
+ if test -n "$LIBPNG" && test -z "$LIBZ"; then
+ LIBPNG="$LIBPNG -lz"
+ fi
+fi
+if test $HAVE_PNG = yes; then
+ AC_DEFINE([HAVE_PNG], [1], [Define to 1 if you have the png library.])
+
+ SAVE_CFLAGS=$CFLAGS
+ CFLAGS="$CFLAGS $PNG_CFLAGS"
+ AC_CHECK_DECL([png_longjmp],
+ [],
+ [AC_DEFINE([PNG_DEPSTRUCT], [],
+ [Define to empty to suppress deprecation warnings when building
+ with --enable-gcc-warnings and with libpng versions before 1.5,
+ which lack png_longjmp.])],
+ [[#include <png.h>
+ ]])
+ CFLAGS=$SAVE_CFLAGS
+fi
+AC_SUBST(LIBPNG)
+AC_SUBST(PNG_CFLAGS)
### Use -ltiff if available, unless `--with-tiff=no'.
### mingw32 doesn't use -ltiff, since it loads the library dynamically.
2014-05-04 Paul Eggert <eggert@cs.ucla.edu>
- Revert recent libpng changes (Bug#17339).
- * Makefile.in (PNG_CFLAGS): Remove; all uses removed.
- * image.c [HAVE_LIBPNG_PNG_H]: Include <libpng/png.h>, not <png.h>.
+ Consult libpng-config more consistently (Bug#17339).
+ * Makefile.in (PNG_CFLAGS): New var.
+ (ALL_CFLAGS): Use it.
+ * image.c [HAVE_PNG]: Don't worry about <libpng/png.h>, as
+ CFLAGS now handles this.
2014-05-03 Paul Eggert <eggert@cs.ucla.edu>
* buffer.c (overlay_strings): Fix the wording of the commentary.
-2014-05-02 Paul Eggert <eggert@cs.ucla.edu>
-
- Consult libpng-config more consistently (Bug#17339).
- * Makefile.in (PNG_CFLAGS): New var.
- (ALL_CFLAGS): Use it.
- * image.c [HAVE_PNG]: Don't worry about <libpng/png.h>, as
- CFLAGS now handles this.
-
2014-05-01 Glenn Morris <rgm@gnu.org>
* floatfns.c (Fisnan):