118 lines
2.8 KiB
Plaintext
118 lines
2.8 KiB
Plaintext
dnl From FIND_MOTIF and ACX_PTHREAD, without much understanding
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dnl
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dnl FIND_PNG[ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]
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dnl ------------------------------------------------
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dnl
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dnl Find PNG libraries and headers
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dnl
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dnl Put compile stuff in PNG_INCLUDES
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dnl Put link stuff in PNG_LIBS
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dnl Define HAVE_PNG if found.
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dnl
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AC_DEFUN([FIND_PNG], [
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AC_REQUIRE([AC_PATH_XTRA])
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PNG_INCLUDES=""
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PNG_LIBS=""
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AC_ARG_WITH(png,
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AS_HELP_STRING([--without-png], [build without libpng (default: test)]))
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# Treat --without-png like --without-png-includes --without-png-libraries.
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if test "$with_png" = "no"; then
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PNG_INCLUDES=no
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PNG_LIBS=no
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fi
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AC_ARG_WITH(png-includes,
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AS_HELP_STRING([--with-png-includes=DIR], [libpng includes are in DIR]),
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PNG_INCLUDES="-I$withval")
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AC_ARG_WITH(png-libraries,
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AS_HELP_STRING([--with-png-libraries=DIR], [libpng libraries are in DIR]),
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PNG_LIBS="-L$withval -lpng")
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AC_MSG_CHECKING(for libpng)
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# Look for png.h
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if test "$PNG_INCLUDES" = ""; then
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# Check the standard search path
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AC_TRY_COMPILE([#include <png.h>],[int a;],[
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PNG_INCLUDES=""
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], [
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# png.h is not in the standard search path, try
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# $prefix
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png_save_INCLUDES="$INCLUDES"
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INCLUDES="-I${prefix}/include $INCLUDES"
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AC_TRY_COMPILE([#include <png.h>],[int a;],[
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PNG_INCLUDES="-I${prefix}/include"
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], [
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PNG_INCLUDES="no"
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])
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INCLUDES=$png_save_INCLUDES
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])
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fi
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# Now for the libraries
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if test "$PNG_LIBS" = ""; then
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png_save_LIBS="$LIBS"
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png_save_INCLUDES="$INCLUDES"
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LIBS="-lpng $LIBS"
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INCLUDES="$PNG_INCLUDES $INCLUDES"
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# Try the standard search path first
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AC_TRY_LINK([#include <png.h>],[png_access_version_number()], [
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PNG_LIBS="-lpng"
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], [
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# libpng is not in the standard search path, try $prefix
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LIBS="-L${prefix}/lib $LIBS"
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AC_TRY_LINK([#include <png.h>],[png_access_version_number()], [
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PNG_LIBS="-L${prefix}/lib -lpng"
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], [
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PNG_LIBS=no
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])
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])
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LIBS="$png_save_LIBS"
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INCLUDES="$png_save_INCLUDES"
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fi
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AC_SUBST(PNG_LIBS)
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AC_SUBST(PNG_INCLUDES)
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# Print a helpful message
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png_libraries_result="$PNG_LIBS"
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png_includes_result="$PNG_INCLUDES"
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if test x"$png_libraries_result" = x""; then
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png_libraries_result="in default path"
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fi
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if test x"$png_includes_result" = x""; then
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png_includes_result="in default path"
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fi
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if test "$png_libraries_result" = "no"; then
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png_libraries_result="(none)"
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fi
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if test "$png_includes_result" = "no"; then
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png_includes_result="(none)"
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fi
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AC_MSG_RESULT([libraries $png_libraries_result, headers $png_includes_result])
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# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
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if test "$PNG_INCLUDES" != "no" && test "$PNG_LIBS" != "no"; then
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AC_DEFINE(HAVE_PNG,1,[Define if you have png libraries and header files.])
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$1
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else
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PNG_INCLUDES=""
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PNG_LIBS=""
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$2
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fi
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])dnl
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