configure.ac

   1 dnl Process this file with autoconf to produce a configure script.
   2
   3 AC_INIT([foobar],[m4_esyscmd(./version-gen.sh)],
   4                 [Sebastian Harl <sh@tokkee.org>])
   5 AC_CONFIG_SRCDIR([src/foobar.c])
   6 AC_CONFIG_HEADERS([src/config.h])
   7 AC_PREFIX_DEFAULT([/opt/foobar])
   8
   9 AM_INIT_AUTOMAKE([foreign -Wall])
  10
  11 AC_LANG(C)
  12
  13 AC_SYS_LARGEFILE
  14
  15 AC_PROG_CC
  16 AC_PROG_CPP
  17 AC_PROG_INSTALL
  18 AC_PROG_LN_S
  19 AC_PROG_MAKE_SET
  20
  21 AM_PROG_CC_C_O
  22
  23 AC_PROG_LIBTOOL
  24
  25 test_cc_flags() {
  26         AC_LANG_CONFTEST([int main() {}])
  27         $CC -c conftest.c $CFLAGS $@ > /dev/null 2> /dev/null
  28         ret=$?
  29         rm -f conftest.o
  30         return $ret
  31 }
  32
  33 m4_divert_once([HELP_ENABLE], [
  34 Build options:])
  35
  36 dnl Optionally stick to standard C99 and POSIX:2001 as close as possible.
  37 AC_ARG_ENABLE([standards],
  38                 AS_HELP_STRING([--enable-standards],
  39                                 [C99 / POSIX standards compliance mode @<:@default=no@:>@]),
  40                 [enable_standards="$enableval"],
  41                 [enable_standards="no"])
  42
  43 if test "x$enable_standards" = "xyes"; then
  44         AC_DEFINE([_ISOC99_SOURCE], 1,
  45                         [Define to enforce ISO/IEC 9899:1999 (C99) compliance.])
  46         AC_DEFINE([_POSIX_C_SOURCE], 200112L,
  47                         [Define to enforce IEEE 1003.1-2001 (POSIX:2001) compliance.])
  48         AC_DEFINE([_XOPEN_SOURCE], 600,
  49                         [Define to enforce X/Open 6 (XSI) compliance.])
  50         AC_DEFINE([_REENTRANT], 1,
  51                         [Define to enable reentrant interfaces.])
  52         AC_DEFINE([_THREAD_SAFE], 1,
  53                         [Define to enable reentrant interfaces.])
  54
  55         for flag in -std=c99 -pedantic; do
  56                 AC_MSG_CHECKING([whether $CC accepts $flag])
  57
  58                 if test_cc_flags $flag; then
  59                         CFLAGS="$CFLAGS $flag"
  60                         AC_MSG_RESULT([yes])
  61                 else
  62                         AC_MSG_RESULT([no])
  63                 fi
  64         done
  65 fi
  66
  67 dnl Hardening (see e.g. http://wiki.debian.org/Hardening for a motivation).
  68 AC_DEFINE([_FORTIFY_SOURCE], 2,
  69                 [Define to enable protection against static sized buffer overflows.])
  70 AC_ARG_ENABLE([hardening],
  71                 AS_HELP_STRING([--disable-hardening],
  72                                 [hardening options @<:@default=yes@:>@]),
  73                 [enable_hardening="$enableval"],
  74                 [enable_hardening="yes"])
  75
  76 if test "x$enable_hardening" = "xyes"; then
  77         hardening=0
  78         hardening_tests=0
  79         for flag in -Wformat -Wformat-security; do
  80                 hardening_tests=$(($hardening_tests + 1))
  81                 AC_MSG_CHECKING([whether $CC accepts $flag])
  82
  83                 if test_cc_flags $flag; then
  84                         CFLAGS="$CFLAGS $flag"
  85                         hardening=$(($hardening + 1))
  86                         AC_MSG_RESULT([yes])
  87                 else
  88                         AC_MSG_RESULT([no])
  89                 fi
  90         done
  91         if test $hardening -ne $hardening_tests; then
  92                 AC_MSG_WARN(
  93                                 [Some hardening options are not supported by your compiler!])
  94         fi
  95 fi
  96
  97 dnl Strict checking for potential problems.
  98 AC_ARG_ENABLE([strict-checks],
  99                 AS_HELP_STRING([--disable-strict-checks],
 100                                 [strict compiler checks @<:@default=yes@:>@]),
 101                 [enable_strict_checks="$enableval"],
 102                 [enable_strict_checks="yes"])
 103
 104 STRICT_CFLAGS=""
 105 for flag in -Wall -Werror; do
 106         AC_MSG_CHECKING([whether $CC accepts $flag])
 107
 108         if test_cc_flags $flag; then
 109                 STRICT_CFLAGS="$STRICT_CFLAGS $flag"
 110                 AC_MSG_RESULT([yes])
 111         else
 112                 AC_MSG_RESULT([no])
 113         fi
 114 done
 115
 116 if test "x$enable_strict_checks" = "xyes"; then
 117         for flag in -Wextra \
 118                         -Wbad-function-cast \
 119                         -Wcast-align \
 120                         -Wcast-qual \
 121                         -Wconversion \
 122                         -Wdeclaration-after-statement \
 123                         -Wmissing-prototypes \
 124                         -Wpointer-arith \
 125                         -Wshadow \
 126                         -Wstrict-prototypes \
 127                         -Wunreachable-code \
 128                         -Wvla; do
 129                 AC_MSG_CHECKING([whether $CC accepts $flag])
 130
 131                 if test_cc_flags $flag; then
 132                         STRICT_CFLAGS="$STRICT_CFLAGS $flag"
 133                         AC_MSG_RESULT([yes])
 134                 else
 135                         AC_MSG_RESULT([no])
 136                 fi
 137         done
 138 fi
 139 AC_SUBST([STRICT_CFLAGS])
 140
 141 build_date="`date --utc '+%F %T'` (UTC)"
 142 AC_DEFINE_UNQUOTED([BUILD_DATE], ["$build_date"],
 143                 [Define to the date the package has been built on.])
 144
 145 dnl Version information provided by fb_features.h.
 146 FB_VERSION_MAJOR=`echo $PACKAGE_VERSION | cut -d'.' -f1`
 147 FB_VERSION_MINOR=`echo $PACKAGE_VERSION | cut -d'.' -f2`
 148 FB_VERSION_PATCH=`echo $PACKAGE_VERSION | cut -d'.' -f3`
 149 FB_VERSION_EXTRA=`echo $PACKAGE_VERSION | cut -d'.' -f4-`
 150 FB_VERSION_STRING="$FB_VERSION_MAJOR.$FB_VERSION_MINOR.$FB_VERSION_PATCH"
 151
 152 AC_SUBST(FB_VERSION_MAJOR)
 153 AC_SUBST(FB_VERSION_MINOR)
 154 AC_SUBST(FB_VERSION_PATCH)
 155 AC_SUBST(FB_VERSION_EXTRA)
 156 AC_SUBST(FB_VERSION_STRING)
 157
 158 AC_CHECK_HEADERS(libgen.h)
 159
 160 AC_CONFIG_FILES([Makefile src/Makefile src/fb_features.h])
 161 AC_OUTPUT
 162
 163 cat <<EOF;
 164
 165 $PACKAGE_NAME has been configured successfully.
 166
 167 Run 'make' to compile the software and use 'make install' to
 168 install the package into $prefix.
 169
 170 Configuration summary:
 171
 172   package version: $PACKAGE_VERSION
 173   build date: $build_date
 174
 175 Please report bugs to $PACKAGE_BUGREPORT.
 176
 177 EOF
 178