m4/acinclude.m4


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160

dnl acinclude.m4 - configure macros used by pacman and libalpm
dnl Add some custom macros for pacman and libalpm

dnl GCC_STACK_PROTECT_LIB
dnl adds -lssp to LIBS if it is available
dnl ssp is usually provided as part of libc, but was previously a separate lib
dnl It does not hurt to add -lssp even if libc provides SSP - in that case
dnl libssp will simply be ignored.
AC_DEFUN([GCC_STACK_PROTECT_LIB],[
  AC_CACHE_CHECK([whether libssp exists], ssp_cv_lib,
    [ssp_old_libs="$LIBS"
     LIBS="$LIBS -lssp"
     AC_TRY_LINK(,, ssp_cv_lib=yes, ssp_cv_lib=no)
     LIBS="$ssp_old_libs"
    ])
  if test $ssp_cv_lib = yes; then
    LIBS="$LIBS -lssp"
  fi
])

dnl GCC_STACK_PROTECT_CC
dnl checks -fstack-protector-all with the C compiler, if it exists then updates
dnl CFLAGS and defines ENABLE_SSP_CC
AC_DEFUN([GCC_STACK_PROTECT_CC],[
  AC_LANG_ASSERT(C)
  if test "X$CC" != "X"; then
    AC_CACHE_CHECK([whether ${CC} accepts -fstack-protector-all],
      ssp_cv_cc,
      [ssp_old_cflags="$CFLAGS"
       CFLAGS="$CFLAGS -fstack-protector-all"
       AC_TRY_COMPILE(,, ssp_cv_cc=yes, ssp_cv_cc=no)
       CFLAGS="$ssp_old_cflags"
      ])
    if test $ssp_cv_cc = yes; then
      CFLAGS="$CFLAGS -fstack-protector-all"
      AC_DEFINE([ENABLE_SSP_CC], 1, [Define if SSP C support is enabled.])
    fi
  fi
])

dnl GCC_FORTIFY_SOURCE_CC
dnl checks -D_FORTIFY_SOURCE with the C compiler, if it exists then updates
dnl CPPFLAGS
AC_DEFUN([GCC_FORTIFY_SOURCE_CC],[
  AC_LANG_ASSERT(C)
  if test "X$CC" != "X"; then
    AC_MSG_CHECKING(for FORTIFY_SOURCE support)
    fs_old_cppflags="$CPPFLAGS"
    fs_old_cflags="$CFLAGS"
    CPPFLAGS="$CPPFLAGS -D_FORTIFY_SOURCE=2"
    CFLAGS="$CFLAGS -Werror"
    AC_TRY_COMPILE([#include <features.h>], [
      int main() {
      #if !(__GNUC_PREREQ (4, 1) )
      #error No FORTIFY_SOURCE support
      #endif
        return 0;
      }
    ], [
      AC_MSG_RESULT(yes)
      CFLAGS="$fs_old_cflags"
    ], [
      AC_MSG_RESULT(no)
      CPPFLAGS="$fs_old_cppflags"
      CFLAGS="$fs_old_cflags"
    ])
  fi
])

dnl GCC_VISIBILITY_CC
dnl checks -fvisibility=internal with the C compiler, if it exists then
dnl defines ENABLE_VISIBILITY_CC in both configure script and Makefiles
AC_DEFUN([GCC_VISIBILITY_CC],[
  AC_LANG_ASSERT(C)
  if test "X$CC" != "X"; then
    AC_CACHE_CHECK([whether ${CC} accepts -fvisibility=internal],
      visibility_cv_cc,
      [visibility_old_cflags="$CFLAGS"
       CFLAGS="$CFLAGS -fvisibility=internal"
       AC_TRY_COMPILE(,, visibility_cv_cc=yes, visibility_cv_cc=no)
       CFLAGS="$visibility_old_cflags"
      ])
    if test $visibility_cv_cc = yes; then
      AC_DEFINE([ENABLE_VISIBILITY_CC], 1, [Define if symbol visibility C support is enabled.])
    fi
    AM_CONDITIONAL([ENABLE_VISIBILITY_CC], test "x$visibility_cv_cc" = "xyes")
  fi
])

dnl CFLAGS_ADD(PARAMETER, VARIABLE)
dnl Adds parameter to VARIABLE if the compiler supports it.  For example,
dnl CFLAGS_ADD([-Wall],[WARN_FLAGS]).
AC_DEFUN([CFLAGS_ADD],
[AS_VAR_PUSHDEF([my_cflags], [cflags_cv_warn_$1])dnl
AC_CACHE_CHECK([whether compiler handles $1], [my_cflags], [
  save_CFLAGS="$CFLAGS"
  CFLAGS="${CFLAGS} -Werror=unknown-warning-option"
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
                    [],
                    [CFLAGS="$save_CFLAGS"])
  CFLAGS="${CFLAGS} $1"
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
                    [AS_VAR_SET([my_cflags], [yes])],
                    [AS_VAR_SET([my_cflags], [no])])
  CFLAGS="$save_CFLAGS"
])
AS_VAR_PUSHDEF([new_cflags], [[$2]])dnl
AS_VAR_IF([my_cflags], [yes], [AS_VAR_APPEND([new_cflags], [" $1"])])
AS_VAR_POPDEF([new_cflags])dnl
AS_VAR_POPDEF([my_cflags])dnl
m4_ifval([$2], [AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])])dnl
])

dnl Checks for getmntinfo and determines whether it uses statfs or statvfs
AC_DEFUN([FS_STATS_TYPE],
  [AC_CACHE_CHECK([filesystem statistics type], fs_stats_cv_type,
    [AC_CHECK_FUNC(getmntinfo,
      [AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM([[
# include <sys/param.h>
# include <sys/mount.h>
#if HAVE_SYS_UCRED_H
#include <sys/ucred.h>
#endif
extern int getmntinfo (struct statfs **, int);
]],
          [])],
        [fs_stats_cv_type="struct statfs"],
        [fs_stats_cv_type="struct statvfs"])],
      [AC_CHECK_FUNC(getmntent,
        [fs_stats_cv_type="struct statvfs"])]
    )]
  )
  AC_DEFINE_UNQUOTED(FSSTATSTYPE, [$fs_stats_cv_type],
    [Defined as the filesystem stats type ('statvfs' or 'statfs')])
  if test $ac_cv_func_getmntinfo = yes; then
    if test "$fs_stats_cv_type" = "struct statvfs"; then
      AC_DEFINE([HAVE_GETMNTINFO_STATVFS], 1, [Define if getmntinfo() uses statvfs.])
    else
      AC_DEFINE([HAVE_GETMNTINFO_STATFS], 1, [Define if getmntinfo() uses statfs.])
    fi
  fi
])

dnl Checks for PATH_MAX and defines it if not present
AC_DEFUN([PATH_MAX_DEFINED],
  [AC_CACHE_CHECK([PATH_MAX defined], path_max_cv_defined,
    [AC_EGREP_CPP(yes, [[
#include <limits.h>
#if defined(PATH_MAX)
yes
#endif
]],
      [path_max_cv_defined=yes],
      [path_max_cv_defined=no])]
  )
  if test $path_max_cv_defined = no; then
    AC_DEFINE([PATH_MAX], 4096, [Define if PATH_MAX is undefined by limits.h.])
  fi
])