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 AC_LIBREPLACE_CC_CHECKS
   9
  10 #
  11 # Set the debug symbol option if we have
  12 # --enable-*developer or --enable-debug
  13 # and the compiler supports it
  14 #
  15 if test x$ac_cv_prog_cc_g = xyes -a x$debug = xyes; then
  16         CFLAGS="${CFLAGS} -g"
  17 fi
  18
  19 ############################################
  20 # check if the compiler handles c99 struct initialization
  21 LIBREPLACE_C99_STRUCT_INIT(samba_cv_c99_struct_initialization=yes,
  22                     samba_cv_c99_struct_initialization=no)
  23
  24 if test x"$samba_cv_c99_struct_initialization" != x"yes"; then
  25         AC_MSG_WARN([C compiler does not support c99 struct initialization!])
  26         AC_MSG_ERROR([Please Install gcc from http://gcc.gnu.org/])
  27 fi
  28
  29 ############################################
  30 # check if the compiler can handle negative enum values
  31 # and don't truncate the values to INT_MAX
  32 # a runtime test is needed here
  33 AC_CACHE_CHECK([that the C compiler understands negative enum values],SMB_BUILD_CC_NEGATIVE_ENUM_VALUES, [
  34     AC_TRY_RUN(
  35 [
  36         #include <stdio.h>
  37         enum negative_values { NEGATIVE_VALUE = 0xFFFFFFFF };
  38         int main(void) {
  39                 enum negative_values v1 = NEGATIVE_VALUE;
  40                 unsigned v2 = 0xFFFFFFFF;
  41                 if (v1 != v2) {
  42                         printf("v1=0x%08x v2=0x%08x\n", v1, v2);
  43                         return 1;
  44                 }
  45                 return 0;
  46         }
  47 ],
  48         SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=yes,SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=no)])
  49 if test x"$SMB_BUILD_CC_NEGATIVE_ENUM_VALUES" != x"yes"; then
  50         AC_DEFINE(USE_UINT_ENUMS, 1, [Whether the compiler has uint enum support])
  51 fi
  52
  53 AC_MSG_CHECKING([for test routines])
  54 AC_TRY_RUN([#include "${srcdir-.}/build/tests/trivial.c"],
  55             AC_MSG_RESULT(yes),
  56             AC_MSG_ERROR([cant find test code. Aborting config]),
  57             AC_MSG_WARN([cannot run when cross-compiling]))
  58
  59 #
  60 # Check if the compiler support ELF visibility for symbols
  61 #
  62
  63 visibility_attribute=no
  64 VISIBILITY_CFLAGS=""
  65 if test x"$GCC" = x"yes" ; then
  66         AX_CFLAGS_GCC_OPTION([-fvisibility=hidden], VISIBILITY_CFLAGS)
  67 fi
  68
  69 if test -n "$VISIBILITY_CFLAGS"; then
  70         AC_MSG_CHECKING([whether the C compiler supports the visibility attribute])
  71         OLD_CFLAGS="$CFLAGS"
  72
  73         CFLAGS="$CFLAGS $VISIBILITY_CFLAGS"
  74         AC_TRY_LINK([],
  75         [
  76                 void vis_foo1(void) {}
  77                 __attribute__((visibility("default"))) void vis_foo2(void) {}
  78                 #include "${srcdir-.}/build/tests/trivial.c"
  79         ],[
  80                 AC_MSG_RESULT(yes)
  81                 AC_DEFINE(HAVE_VISIBILITY_ATTR,1,[Whether the C compiler supports the visibility attribute])
  82                 visibility_attribute=yes
  83         ],[
  84                 AC_MSG_RESULT(no)
  85         ])
  86         CFLAGS="$OLD_CFLAGS"
  87 fi
  88 AC_SUBST(visibility_attribute)
  89
  90 #
  91 # Check if the compiler can handle the options we selected by
  92 # --enable-*developer
  93 #
  94 DEVELOPER_CFLAGS=""
  95 if test x$developer = xyes; then
  96         OLD_CFLAGS="${CFLAGS}"
  97
  98         CFLAGS="${CFLAGS} -D_SAMBA_DEVELOPER_DONNOT_USE_O2_"
  99         DEVELOPER_CFLAGS="-DDEBUG_PASSWORD -DDEVELOPER"
 100         if test x"$GCC" = x"yes" ; then
 101             #
 102             # warnings we want...
 103             #
 104             AX_CFLAGS_GCC_OPTION(-Wall, DEVELOPER_CFLAGS)
 105             AX_CFLAGS_GCC_OPTION(-Wshadow, DEVELOPER_CFLAGS)
 106             AX_CFLAGS_GCC_OPTION(-Werror-implicit-function-declaration, DEVELOPER_CFLAGS)
 107             AX_CFLAGS_GCC_OPTION(-Wstrict-prototypes, DEVELOPER_CFLAGS)
 108             AX_CFLAGS_GCC_OPTION(-Wpointer-arith, DEVELOPER_CFLAGS)
 109             AX_CFLAGS_GCC_OPTION(-Wcast-qual, DEVELOPER_CFLAGS)
 110             AX_CFLAGS_GCC_OPTION(-Wcast-align, DEVELOPER_CFLAGS)
 111             AX_CFLAGS_GCC_OPTION(-Wwrite-strings, DEVELOPER_CFLAGS)
 112             AX_CFLAGS_GCC_OPTION(-Wmissing-format-attribute, DEVELOPER_CFLAGS)
 113             AX_CFLAGS_GCC_OPTION(-Wformat=2, DEVELOPER_CFLAGS)
 114             AX_CFLAGS_GCC_OPTION(-Wdeclaration-after-statement, DEVELOPER_CFLAGS)
 115             AX_CFLAGS_GCC_OPTION(-Wunused-macros, DEVELOPER_CFLAGS)
 116 #           AX_CFLAGS_GCC_OPTION(-Wextra, DEVELOPER_CFLAGS)
 117 #           AX_CFLAGS_GCC_OPTION(-Wc++-compat, DEVELOPER_CFLAGS)
 118 #           AX_CFLAGS_GCC_OPTION(-Wmissing-prototypes, DEVELOPER_CFLAGS)
 119 #           AX_CFLAGS_GCC_OPTION(-Wmissing-declarations, DEVELOPER_CFLAGS)
 120 #           AX_CFLAGS_GCC_OPTION(-Wmissing-field-initializers, DEVELOPER_CFLAGS)
 121             #
 122             # warnings we don't want...
 123             #
 124             AX_CFLAGS_GCC_OPTION(-Wno-format-y2k, DEVELOPER_CFLAGS)
 125             AX_CFLAGS_GCC_OPTION(-Wno-unused-parameter, DEVELOPER_CFLAGS)
 126         else
 127             AX_CFLAGS_IRIX_OPTION(-fullwarn, DEVELOPER_CFLAGS)
 128         fi
 129
 130         CFLAGS="${OLD_CFLAGS}"
 131 fi
 132 if test -n "$DEVELOPER_CFLAGS"; then
 133         OLD_CFLAGS="${CFLAGS}"
 134         CFLAGS="${CFLAGS} ${DEVELOPER_CFLAGS}"
 135         AC_MSG_CHECKING([that the C compiler can use the DEVELOPER_CFLAGS])
 136         AC_TRY_COMPILE([],[],
 137                 AC_MSG_RESULT(yes),
 138                 DEVELOPER_CFLAGS=""; AC_MSG_RESULT(no))
 139         CFLAGS="${OLD_CFLAGS}"
 140 fi
 141
 142 # allow for --with-hostcc=gcc
 143 AC_ARG_WITH(hostcc,[  --with-hostcc=compiler    choose host compiler],
 144 [HOSTCC=$withval],
 145 [
 146 if test z"$cross_compiling" = "yes"; then
 147         HOSTCC=cc
 148 else
 149         HOSTCC=$CC
 150 fi
 151 ])
 152 AC_SUBST(HOSTCC)
 153
 154 AC_PATH_PROG(GCOV,gcov)