source4/build/m4/check_cc.m4

   1 dnl SMB Build Environment CC Checks
   2 dnl -------------------------------------------------------
   3 dnl  Copyright (C) Stefan (metze) Metzmacher 2004
   4 dnl  Released under the GNU GPL
   5 dnl -------------------------------------------------------
   6 dnl
   7
   8 # don't let the AC_PROG_CC macro auto set the CFLAGS
   9 OLD_CFLAGS="${CFLAGS}"
  10 AC_PROG_CC
  11 CFLAGS="${OLD_CFLAGS}"
  12 if test x"$CC" = x""; then
  13         AC_MSG_WARN([No c compiler was not found!])
  14         AC_MSG_ERROR([Please Install gcc from http://gcc.gnu.org/])
  15 fi
  16
  17 #
  18 # Set the debug symbol option if we have
  19 # --enable-*developer or --enable-debug
  20 # and the compiler supports it
  21 #
  22 if test x$ac_cv_prog_cc_g = xyes -a x$debug = xyes; then
  23         CFLAGS="${CFLAGS} -g"
  24 fi
  25
  26 dnl needed before AC_TRY_COMPILE
  27 AC_ISC_POSIX
  28
  29 AC_C_INLINE
  30
  31 AC_CACHE_CHECK([that the C compiler can precompile header files],samba_cv_precompiled_headers, [
  32         dnl Check whether the compiler can generate precompiled headers
  33         touch conftest.h
  34         if ${CC-cc} conftest.h 2> /dev/null && test -f conftest.h.gch; then
  35                 precompiled_headers=yes
  36         else
  37                 precompiled_headers=no
  38         fi])
  39 AC_SUBST(precompiled_headers)
  40
  41
  42 dnl Check if the C compiler understands volatile (it should, being ANSI).
  43 AC_CACHE_CHECK([that the C compiler understands volatile],samba_cv_volatile, [
  44         AC_TRY_COMPILE([#include <sys/types.h>],[volatile int i = 0],
  45                 samba_cv_volatile=yes,samba_cv_volatile=no)])
  46 if test x"$samba_cv_volatile" = x"yes"; then
  47         AC_DEFINE(HAVE_VOLATILE, 1, [Whether the C compiler understands volatile])
  48 fi
  49
  50 ############################################
  51 # check if the compiler can do immediate structures
  52 AC_CACHE_CHECK([for immediate structures],samba_cv_immediate_structures, [
  53     AC_TRY_COMPILE([
  54 #include <stdio.h>],
  55 [
  56    typedef struct {unsigned x;} FOOBAR;
  57    #define X_FOOBAR(x) ((FOOBAR) { x })
  58    #define FOO_ONE X_FOOBAR(1)
  59    FOOBAR f = FOO_ONE;
  60    static struct {
  61         FOOBAR y;
  62         } f2[] = {
  63                 {FOO_ONE}
  64         };
  65 ],
  66         samba_cv_immediate_structures=yes,samba_cv_immediate_structures=no)])
  67 if test x"$samba_cv_immediate_structures" = x"yes"; then
  68    AC_DEFINE(HAVE_IMMEDIATE_STRUCTURES,1,[Whether the compiler supports immediate structures])
  69 fi
  70 AC_SUBST(samba_cv_immediate_structures)
  71
  72 ############################################
  73 # check if the compiler handles c99 struct initialization
  74 SMB_CC_SUPPORTS_C99_STRUCT_INIT(samba_cv_c99_struct_initialization=yes,
  75                     samba_cv_c99_struct_initialization=no)
  76
  77 if test x"$samba_cv_c99_struct_initialization" != x"yes"; then
  78         # We might need to add some flags to CC to get c99 behaviour.
  79         AX_CFLAGS_IRIX_OPTION(-c99, CFLAGS)
  80         SMB_CC_SUPPORTS_C99_STRUCT_INIT(samba_cv_c99_struct_initialization=yes,
  81                             samba_cv_c99_struct_initialization=no)
  82 fi
  83
  84 if test x"$samba_cv_c99_struct_initialization" != x"yes"; then
  85         AC_MSG_WARN([C compiler does not support c99 struct initialization!])
  86         AC_MSG_ERROR([Please Install gcc from http://gcc.gnu.org/])
  87 fi
  88
  89 ############################################
  90 # check if the compiler can handle negative enum values
  91 # and don't truncate the values to INT_MAX
  92 # a runtime test is needed here
  93 AC_CACHE_CHECK([that the C compiler understands negative enum values],SMB_BUILD_CC_NEGATIVE_ENUM_VALUES, [
  94     AC_TRY_RUN(
  95 [
  96         #include <stdio.h>
  97         enum negative_values { NEGATIVE_VALUE = 0xFFFFFFFF };
  98         int main(void) {
  99                 enum negative_values v1 = NEGATIVE_VALUE;
 100                 unsigned v2 = NEGATIVE_VALUE;
 101
 102                 if (v1 != 0xFFFFFFFF) {
 103                         printf("%u != 0xFFFFFFFF\n", v1);
 104                         return 1;
 105                 }
 106                 if (v2 != 0xFFFFFFFF) {
 107                         printf("%u != 0xFFFFFFFF\n", v2);
 108                         return 1;
 109                 }
 110
 111                 return 0;
 112         }
 113 ],
 114         SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=yes,SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=no)])
 115 if test x"$SMB_BUILD_CC_NEGATIVE_ENUM_VALUES" != x"yes"; then
 116         AC_MSG_WARN([using --unit-enums for pidl])
 117         PIDL_ARGS="$PIDL_ARGS --uint-enums"
 118 fi
 119
 120 AC_MSG_CHECKING([for test routines])
 121 AC_TRY_RUN([#include "${srcdir-.}/build/tests/trivial.c"],
 122             AC_MSG_RESULT(yes),
 123             AC_MSG_ERROR([cant find test code. Aborting config]),
 124             AC_MSG_WARN([cannot run when cross-compiling]))
 125
 126 #
 127 # Check if the compiler support ELF visibility for symbols
 128 #
 129
 130 visibility_attribute=no
 131 VISIBILITY_CFLAGS=""
 132 if test x"$GCC" = x"yes" ; then
 133         AX_CFLAGS_GCC_OPTION([-fvisibility=hidden], VISIBILITY_CFLAGS)
 134 fi
 135
 136 if test -n "$VISIBILITY_CFLAGS"; then
 137         AC_MSG_CHECKING([whether the C compiler supports the visibility attribute])
 138         OLD_CFLAGS="$CFLAGS"
 139
 140         CFLAGS="$CFLAGS $VISIBILITY_CFLAGS"
 141         AC_TRY_RUN([
 142                 void vis_foo1(void) {}
 143                 __attribute__((visibility("default"))) void vis_foo2(void) {}
 144                 #include "${srcdir-.}/build/tests/trivial.c"
 145         ],[
 146                 AC_MSG_RESULT(yes)
 147                 AC_DEFINE(HAVE_VISIBILITY_ATTR,1,[Whether the C compiler supports the visibility attribute])
 148                 visibility_attribute=yes
 149         ],[
 150                 AC_MSG_RESULT(no)
 151         ])
 152         CFLAGS="$OLD_CFLAGS"
 153 fi
 154 AC_SUBST(visibility_attribute)
 155
 156 #
 157 # Check if the compiler can handle the options we selected by
 158 # --enable-*developer
 159 #
 160 DEVELOPER_CFLAGS=""
 161 if test x$developer = xyes; then
 162         OLD_CFLAGS="${CFLAGS}"
 163
 164         CFLAGS="${CFLAGS} -D_SAMBA_DEVELOPER_DONNOT_USE_O2_"
 165         DEVELOPER_CFLAGS="-DDEBUG_PASSWORD -DDEVELOPER"
 166         if test x"$GCC" = x"yes" ; then
 167             AX_CFLAGS_GCC_OPTION(-Wall, DEVELOPER_CFLAGS)
 168             AX_CFLAGS_GCC_OPTION(-Wshadow, DEVELOPER_CFLAGS)
 169             AX_CFLAGS_GCC_OPTION(-Werror-implicit-function-declaration, DEVELOPER_CFLAGS)
 170             AX_CFLAGS_GCC_OPTION(-Wstrict-prototypes, DEVELOPER_CFLAGS)
 171             AX_CFLAGS_GCC_OPTION(-Wpointer-arith, DEVELOPER_CFLAGS)
 172             AX_CFLAGS_GCC_OPTION(-Wcast-qual, DEVELOPER_CFLAGS)
 173             AX_CFLAGS_GCC_OPTION(-Wcast-align, DEVELOPER_CFLAGS)
 174             AX_CFLAGS_GCC_OPTION(-Wwrite-strings, DEVELOPER_CFLAGS)
 175             AX_CFLAGS_GCC_OPTION(-Wmissing-format-attribute, DEVELOPER_CFLAGS)
 176             AX_CFLAGS_GCC_OPTION(-Wformat=2, DEVELOPER_CFLAGS)
 177             AX_CFLAGS_GCC_OPTION(-Wno-format-y2k, DEVELOPER_CFLAGS)
 178             AX_CFLAGS_GCC_OPTION(-Wdeclaration-after-statement, DEVELOPER_CFLAGS)
 179             AX_CFLAGS_GCC_OPTION(-Wunused-macros, DEVELOPER_CFLAGS)
 180         else
 181             AX_CFLAGS_IRIX_OPTION(-fullwarn, DEVELOPER_CFLAGS)
 182         fi
 183
 184         CFLAGS="${OLD_CFLAGS}"
 185 fi
 186 if test -n "$DEVELOPER_CFLAGS"; then
 187         OLD_CFLAGS="${CFLAGS}"
 188         CFLAGS="${CFLAGS} ${DEVELOPER_CFLAGS}"
 189         AC_MSG_CHECKING([that the C compiler can use the DEVELOPER_CFLAGS])
 190         AC_TRY_COMPILE([],[],
 191                 AC_MSG_RESULT(yes),
 192                 DEVELOPER_CFLAGS=""; AC_MSG_RESULT(no))
 193         CFLAGS="${OLD_CFLAGS}"
 194 fi
 195
 196 # allow for --with-hostcc=gcc
 197 AC_ARG_WITH(hostcc,[  --with-hostcc=compiler    choose host compiler],
 198 [HOSTCC=$withval],
 199 [
 200 if test z"$cross_compiling" = "yes"; then
 201         HOSTCC=cc
 202 else
 203         HOSTCC=$CC
 204 fi
 205 ])
 206 AC_SUBST(HOSTCC)
 207
 208 AC_PATH_PROG(GCOV,gcov)
 209
 210 AC_PATH_PROG(MAKE,make)
 211
 212 AC_CACHE_CHECK([whether we have GNU make], samba_cv_gnu_make, [
 213 if $ac_cv_path_MAKE --version | head -1 | grep GNU 2>/dev/null >/dev/null
 214 then
 215         samba_cv_gnu_make=yes
 216 else
 217         samba_cv_gnu_make=no
 218 fi
 219 ])
 220
 221 GNU_MAKE=$samba_cv_gnu_make
 222 AC_SUBST(GNU_MAKE)
 223
 224 if test "x$GNU_MAKE" = x"yes"; then
 225         AC_CACHE_CHECK([GNU make version], samba_cv_gnu_make_version,[
 226                 samba_cv_gnu_make_version=`$ac_cv_path_MAKE --version | head -1 | cut -d " " -f 3 2>/dev/null`
 227         ])
 228         GNU_MAKE_VERSION=$samba_cv_gnu_make_version
 229         AC_SUBST(GNU_MAKE_VERSION)
 230 fi
 231
 232
 233 new_make=no
 234 AC_MSG_CHECKING([for GNU make >= 3.81])
 235 if test x$GNU_MAKE = x"yes"; then
 236         if $PERL -e " \$_ = '$GNU_MAKE_VERSION'; s/@<:@^\d\.@:>@.*//g; exit (\$_ < 3.81);"; then
 237                 new_make=yes
 238         fi
 239 fi
 240 AC_MSG_RESULT($new_make)
 241 automatic_dependencies=no
 242 AX_CFLAGS_GCC_OPTION([-M -MT conftest.d -MF conftest.o], [], [ automatic_dependencies=$new_make ], [])
 243 AC_MSG_CHECKING([Whether to use automatic dependencies])
 244 AC_MSG_RESULT($automatic_dependencies)
 245 AC_SUBST(automatic_dependencies)