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 = NEGATIVE_VALUE;
  41
  42                 if (v1 != 0xFFFFFFFF) {
  43                         printf("%u != 0xFFFFFFFF\n", v1);
  44                         return 1;
  45                 }
  46                 if (v2 != 0xFFFFFFFF) {
  47                         printf("%u != 0xFFFFFFFF\n", v2);
  48                         return 1;
  49                 }
  50
  51                 return 0;
  52         }
  53 ],
  54         SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=yes,SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=no)])
  55 if test x"$SMB_BUILD_CC_NEGATIVE_ENUM_VALUES" != x"yes"; then
  56         AC_MSG_WARN([using --unit-enums for pidl])
  57         PIDL_ARGS="$PIDL_ARGS --uint-enums"
  58 fi
  59
  60 AC_MSG_CHECKING([for test routines])
  61 AC_TRY_RUN([#include "${srcdir-.}/build/tests/trivial.c"],
  62             AC_MSG_RESULT(yes),
  63             AC_MSG_ERROR([cant find test code. Aborting config]),
  64             AC_MSG_WARN([cannot run when cross-compiling]))
  65
  66 #
  67 # Check if the compiler support ELF visibility for symbols
  68 #
  69
  70 visibility_attribute=no
  71 VISIBILITY_CFLAGS=""
  72 if test x"$GCC" = x"yes" ; then
  73         AX_CFLAGS_GCC_OPTION([-fvisibility=hidden], VISIBILITY_CFLAGS)
  74 fi
  75
  76 if test -n "$VISIBILITY_CFLAGS"; then
  77         AC_MSG_CHECKING([whether the C compiler supports the visibility attribute])
  78         OLD_CFLAGS="$CFLAGS"
  79
  80         CFLAGS="$CFLAGS $VISIBILITY_CFLAGS"
  81         AC_TRY_RUN([
  82                 void vis_foo1(void) {}
  83                 __attribute__((visibility("default"))) void vis_foo2(void) {}
  84                 #include "${srcdir-.}/build/tests/trivial.c"
  85         ],[
  86                 AC_MSG_RESULT(yes)
  87                 AC_DEFINE(HAVE_VISIBILITY_ATTR,1,[Whether the C compiler supports the visibility attribute])
  88                 visibility_attribute=yes
  89         ],[
  90                 AC_MSG_RESULT(no)
  91         ])
  92         CFLAGS="$OLD_CFLAGS"
  93 fi
  94 AC_SUBST(visibility_attribute)
  95
  96 #
  97 # Check if the compiler can handle the options we selected by
  98 # --enable-*developer
  99 #
 100 DEVELOPER_CFLAGS=""
 101 if test x$developer = xyes; then
 102         OLD_CFLAGS="${CFLAGS}"
 103
 104         CFLAGS="${CFLAGS} -D_SAMBA_DEVELOPER_DONNOT_USE_O2_"
 105         DEVELOPER_CFLAGS="-DDEBUG_PASSWORD -DDEVELOPER"
 106         if test x"$GCC" = x"yes" ; then
 107             #
 108             # warnings we want...
 109             #
 110             AX_CFLAGS_GCC_OPTION(-Wall, DEVELOPER_CFLAGS)
 111             AX_CFLAGS_GCC_OPTION(-Wshadow, DEVELOPER_CFLAGS)
 112             AX_CFLAGS_GCC_OPTION(-Werror-implicit-function-declaration, DEVELOPER_CFLAGS)
 113             AX_CFLAGS_GCC_OPTION(-Wstrict-prototypes, DEVELOPER_CFLAGS)
 114             AX_CFLAGS_GCC_OPTION(-Wpointer-arith, DEVELOPER_CFLAGS)
 115             AX_CFLAGS_GCC_OPTION(-Wcast-qual, DEVELOPER_CFLAGS)
 116             AX_CFLAGS_GCC_OPTION(-Wcast-align, DEVELOPER_CFLAGS)
 117             AX_CFLAGS_GCC_OPTION(-Wwrite-strings, DEVELOPER_CFLAGS)
 118             AX_CFLAGS_GCC_OPTION(-Wmissing-format-attribute, DEVELOPER_CFLAGS)
 119             AX_CFLAGS_GCC_OPTION(-Wformat=2, DEVELOPER_CFLAGS)
 120             AX_CFLAGS_GCC_OPTION(-Wdeclaration-after-statement, DEVELOPER_CFLAGS)
 121             AX_CFLAGS_GCC_OPTION(-Wunused-macros, DEVELOPER_CFLAGS)
 122 #           AX_CFLAGS_GCC_OPTION(-Wextra, DEVELOPER_CFLAGS)
 123 #           AX_CFLAGS_GCC_OPTION(-Wc++-compat, DEVELOPER_CFLAGS)
 124 #           AX_CFLAGS_GCC_OPTION(-Wmissing-prototypes, DEVELOPER_CFLAGS)
 125 #           AX_CFLAGS_GCC_OPTION(-Wmissing-declarations, DEVELOPER_CFLAGS)
 126 #           AX_CFLAGS_GCC_OPTION(-Wmissing-field-initializers, DEVELOPER_CFLAGS)
 127             #
 128             # warnings we don't want...
 129             #
 130             AX_CFLAGS_GCC_OPTION(-Wno-format-y2k, DEVELOPER_CFLAGS)
 131             AX_CFLAGS_GCC_OPTION(-Wno-unused-parameter, DEVELOPER_CFLAGS)
 132         else
 133             AX_CFLAGS_IRIX_OPTION(-fullwarn, DEVELOPER_CFLAGS)
 134         fi
 135
 136         CFLAGS="${OLD_CFLAGS}"
 137 fi
 138 if test -n "$DEVELOPER_CFLAGS"; then
 139         OLD_CFLAGS="${CFLAGS}"
 140         CFLAGS="${CFLAGS} ${DEVELOPER_CFLAGS}"
 141         AC_MSG_CHECKING([that the C compiler can use the DEVELOPER_CFLAGS])
 142         AC_TRY_COMPILE([],[],
 143                 AC_MSG_RESULT(yes),
 144                 DEVELOPER_CFLAGS=""; AC_MSG_RESULT(no))
 145         CFLAGS="${OLD_CFLAGS}"
 146 fi
 147
 148 # allow for --with-hostcc=gcc
 149 AC_ARG_WITH(hostcc,[  --with-hostcc=compiler    choose host compiler],
 150 [HOSTCC=$withval],
 151 [
 152 if test z"$cross_compiling" = "yes"; then
 153         HOSTCC=cc
 154 else
 155         HOSTCC=$CC
 156 fi
 157 ])
 158 AC_SUBST(HOSTCC)
 159
 160 AC_PATH_PROG(GCOV,gcov)