lib-ffi.m4 revision 1712:c8470ff83abe 
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25
26################################################################################
27# Setup libffi (Foreign Function Interface)
28################################################################################
29AC_DEFUN_ONCE([LIB_SETUP_LIBFFI],
30[
31  AC_ARG_WITH(libffi, [AS_HELP_STRING([--with-libffi],
32      [specify prefix directory for the libffi package
33      (expecting the libraries under PATH/lib and the headers under PATH/include)])])
34  AC_ARG_WITH(libffi-include, [AS_HELP_STRING([--with-libffi-include],
35      [specify directory for the libffi include files])])
36  AC_ARG_WITH(libffi-lib, [AS_HELP_STRING([--with-libffi-lib],
37      [specify directory for the libffi library])])
38
39  if test "x$NEEDS_LIB_FFI" = xfalse; then
40    if (test "x${with_libffi}" != x && test "x${with_libffi}" != xno) || \
41        (test "x${with_libffi_include}" != x && test "x${with_libffi_include}" != xno) || \
42        (test "x${with_libffi_lib}" != x && test "x${with_libffi_lib}" != xno); then
43      AC_MSG_WARN([[libffi not used, so --with-libffi[-*] is ignored]])
44    fi
45    LIBFFI_CFLAGS=
46    LIBFFI_LIBS=
47  else
48    LIBFFI_FOUND=no
49
50    if test "x${with_libffi}" = xno || test "x${with_libffi_include}" = xno || test "x${with_libffi_lib}" = xno; then
51      AC_MSG_ERROR([It is not possible to disable the use of libffi. Remove the --without-libffi option.])
52    fi
53
54    if test "x${with_libffi}" != x; then
55      LIBFFI_LIBS="-L${with_libffi}/lib -lffi"
56      LIBFFI_CFLAGS="-I${with_libffi}/include"
57      LIBFFI_FOUND=yes
58    fi
59    if test "x${with_libffi_include}" != x; then
60      LIBFFI_CFLAGS="-I${with_libffi_include}"
61      LIBFFI_FOUND=yes
62    fi
63    if test "x${with_libffi_lib}" != x; then
64      LIBFFI_LIBS="-L${with_libffi_lib} -lffi"
65      LIBFFI_FOUND=yes
66    fi
67    # Do not try pkg-config if we have a sysroot set.
68    if test "x$SYSROOT" = x; then
69      if test "x$LIBFFI_FOUND" = xno; then
70        # Figure out LIBFFI_CFLAGS and LIBFFI_LIBS
71        PKG_CHECK_MODULES([LIBFFI], [libffi], [LIBFFI_FOUND=yes], [LIBFFI_FOUND=no])
72      fi
73    fi
74    if test "x$LIBFFI_FOUND" = xno; then
75      AC_CHECK_HEADERS([ffi.h],
76          [
77            LIBFFI_FOUND=yes
78            LIBFFI_CFLAGS=
79            LIBFFI_LIBS=-lffi
80          ],
81          [LIBFFI_FOUND=no]
82      )
83    fi
84    if test "x$LIBFFI_FOUND" = xno; then
85      HELP_MSG_MISSING_DEPENDENCY([ffi])
86      AC_MSG_ERROR([Could not find libffi! $HELP_MSG])
87    fi
88
89    AC_MSG_CHECKING([if libffi works])
90    AC_LANG_PUSH(C)
91    OLD_CFLAGS="$CFLAGS"
92    CFLAGS="$CFLAGS $LIBFFI_CFLAGS"
93    OLD_LIBS="$LIBS"
94    LIBS="$LIBS $LIBFFI_LIBS"
95    AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <ffi.h>],
96        [
97          ffi_call(NULL, NULL, NULL, NULL);
98          return 0;
99        ])],
100        [LIBFFI_WORKS=yes],
101        [LIBFFI_WORKS=no]
102    )
103    CFLAGS="$OLD_CFLAGS"
104    LIBS="$OLD_LIBS"
105    AC_LANG_POP(C)
106    AC_MSG_RESULT([$LIBFFI_WORKS])
107
108    if test "x$LIBFFI_WORKS" = xno; then
109      HELP_MSG_MISSING_DEPENDENCY([ffi])
110      AC_MSG_ERROR([Found libffi but could not link and compile with it. $HELP_MSG])
111    fi
112  fi
113
114  AC_SUBST(LIBFFI_CFLAGS)
115  AC_SUBST(LIBFFI_LIBS)
116])
117