125 lines
3.0 KiB
Plaintext
125 lines
3.0 KiB
Plaintext
dnl From FIND_MOTIF and ACX_PTHREAD, without much understanding
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dnl
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dnl FIND_ZLIB[ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]
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dnl ------------------------------------------------
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dnl
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dnl Find zlib libraries and headers ... useful for platforms which are missing
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dnl the zlib .pc file
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dnl
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dnl Put compile stuff in ZLIB_INCLUDES
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dnl Put link stuff in ZLIB_LIBS
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dnl Define HAVE_ZLIB if found
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dnl
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AC_DEFUN([FIND_ZLIB], [
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AC_REQUIRE([AC_PATH_XTRA])
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ZLIB_INCLUDES=""
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ZLIB_LIBS=""
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AC_ARG_WITH(zlib,
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AS_HELP_STRING([--without-zlib], [build without zlib (default: test)]))
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# Treat --without-zlib like --without-zlib-includes --without-zlib-libraries.
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if test "$with_zlib" = "no"; then
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ZLIB_INCLUDES=no
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ZLIB_LIBS=no
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fi
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AC_ARG_WITH(zlib-includes,
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AS_HELP_STRING([--with-zlib-includes=DIR], [libz includes are in DIR]),
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ZLIB_INCLUDES="-I$withval")
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AC_ARG_WITH(zlib-libraries,
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AS_HELP_STRING([--with-zlib-libraries=DIR], [libz libraries are in DIR]),
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ZLIB_LIBS="-L$withval -lz")
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AC_MSG_CHECKING(for ZLIB)
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# Look for zlib.h
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if test "$ZLIB_INCLUDES" = ""; then
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# Check the standard search path
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AC_TRY_COMPILE([#include <stdio.h>
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#include <zlib.h>],[int a;],[
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ZLIB_INCLUDES=""
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], [
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# zlib.h is not in the standard search path, try
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# $prefix
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zlib_save_CFLAGS="$CFLAGS"
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CFLAGS="-I${prefix}/include $CFLAGS"
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AC_TRY_COMPILE([#include <stdio.h>
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#include <zlib.h>],[int a;],[
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ZLIB_INCLUDES="-I${prefix}/include"
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], [
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ZLIB_INCLUDES="no"
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])
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CFLAGS=$zlib_save_CFLAGS
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])
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fi
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# Now for the libraries
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if test "$ZLIB_LIBS" = ""; then
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zlib_save_LIBS="$LIBS"
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zlib_save_CFLAGS="$CFLAGS"
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LIBS="-lz $LIBS"
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CFLAGS="$ZLIB_INCLUDES $CFLAGS"
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# Try the standard search path first
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AC_TRY_LINK([#include <stdio.h>
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#include <zlib.h>
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],[z_stream zs;inflateInit2(&zs, 15 | 32)], [
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ZLIB_LIBS="-lz"
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], [
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# libz is not in the standard search path, try $prefix
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LIBS="-L${prefix}/lib $LIBS"
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AC_TRY_LINK([#include <stdio.h>
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#include <zlib.h>
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],[z_stream zs;inflateInit2(&zs, 15 | 32)], [
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ZLIB_LIBS="-L${prefix}/lib -lz"
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], [
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ZLIB_LIBS=no
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])
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])
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LIBS="$zlib_save_LIBS"
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CFLAGS="$zlib_save_CFLAGS"
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fi
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AC_SUBST(ZLIB_LIBS)
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AC_SUBST(ZLIB_INCLUDES)
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# Print a helpful message
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zlib_libraries_result="$ZLIB_LIBS"
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zlib_includes_result="$ZLIB_INCLUDES"
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if test x"$zlib_libraries_result" = x""; then
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zlib_libraries_result="in default path"
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fi
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if test x"$zlib_includes_result" = x""; then
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zlib_includes_result="in default path"
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fi
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if test "$zlib_libraries_result" = "no"; then
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zlib_libraries_result="(none)"
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fi
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if test "$zlib_includes_result" = "no"; then
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zlib_includes_result="(none)"
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fi
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AC_MSG_RESULT([libraries $zlib_libraries_result, headers $zlib_includes_result])
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# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
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if test "$ZLIB_INCLUDES" != "no" && test "$ZLIB_LIBS" != "no"; then
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AC_DEFINE(HAVE_ZLIB,1,[Define if you have zlib libraries and header files.])
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$1
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else
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ZLIB_INCLUDES=""
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ZLIB_LIBS=""
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$2
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fi
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])dnl
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