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 dnl Check if C compiler understands -c and -o at the same time
  30 AC_PROG_CC_C_O
  31 if eval "test \"`echo '$ac_cv_prog_cc_'${ac_cc}_c_o`\" = no"; then
  32         BROKEN_CC=yes
  33 else
  34         BROKEN_CC=no
  35 fi
  36 AC_SUBST(BROKEN_CC)
  37
  38 AC_CACHE_CHECK([that the C compiler can precompile header files],samba_cv_precompiled_headers, [
  39         dnl Check whether the compiler can generate precompiled headers
  40         touch conftest.h
  41         if ${CC-cc} conftest.h 2> /dev/null && test -f conftest.h.gch; then
  42                 samba_cv_precompiled_headers=yes
  43         else
  44                 samba_cv_precompiled_headers=no
  45         fi])
  46 PCH_AVAILABLE="#"
  47 if test x"$samba_cv_precompiled_headers" = x"yes"; then
  48         PCH_AVAILABLE=""
  49 fi
  50 AC_SUBST(PCH_AVAILABLE)
  51
  52
  53 dnl Check if the C compiler understands volatile (it should, being ANSI).
  54 AC_CACHE_CHECK([that the C compiler understands volatile],samba_cv_volatile, [
  55         AC_TRY_COMPILE([#include <sys/types.h>],[volatile int i = 0],
  56                 samba_cv_volatile=yes,samba_cv_volatile=no)])
  57 if test x"$samba_cv_volatile" = x"yes"; then
  58         AC_DEFINE(HAVE_VOLATILE, 1, [Whether the C compiler understands volatile])
  59 fi
  60
  61 ############################################
  62 # check if the compiler can do immediate structures
  63 AC_CACHE_CHECK([for immediate structures],samba_cv_immediate_structures, [
  64     AC_TRY_COMPILE([
  65 #include <stdio.h>],
  66 [
  67    typedef struct {unsigned x;} FOOBAR;
  68    #define X_FOOBAR(x) ((FOOBAR) { x })
  69    #define FOO_ONE X_FOOBAR(1)
  70    FOOBAR f = FOO_ONE;
  71    static struct {
  72         FOOBAR y;
  73         } f2[] = {
  74                 {FOO_ONE}
  75         };
  76 ],
  77         samba_cv_immediate_structures=yes,samba_cv_immediate_structures=no)])
  78 if test x"$samba_cv_immediate_structures" = x"yes"; then
  79    AC_DEFINE(HAVE_IMMEDIATE_STRUCTURES,1,[Whether the compiler supports immediate structures])
  80 fi
  81
  82 ############################################
  83 # check if the compiler handles c99 struct initialization
  84 SMB_CC_SUPPORTS_C99_STRUCT_INIT(samba_cv_c99_struct_initialization=yes,
  85                     samba_cv_c99_struct_initialization=no)
  86
  87 if test x"$samba_cv_c99_struct_initialization" != x"yes"; then
  88         # We might need to add some flags to CC to get c99 behaviour.
  89         AX_CFLAGS_IRIX_OPTION(-c99, CFLAGS)
  90         SMB_CC_SUPPORTS_C99_STRUCT_INIT(samba_cv_c99_struct_initialization=yes,
  91                             samba_cv_c99_struct_initialization=no)
  92 fi
  93
  94 if test x"$samba_cv_c99_struct_initialization" != x"yes"; then
  95         AC_MSG_WARN([C compiler does not support c99 struct initialization!])
  96         AC_MSG_ERROR([Please Install gcc from http://gcc.gnu.org/])
  97 fi
  98
  99 ############################################
 100 # check if the compiler can handle negative enum values
 101 AC_CACHE_CHECK([that the C compiler understands negative enum values],SMB_BUILD_CC_NEGATIVE_ENUM_VALUES, [
 102     AC_TRY_COMPILE([
 103 #include <stdio.h>],
 104 [
 105         enum negative_values { NEGATIVE_VALUE = 0xFFFFFFFF };
 106 ],
 107         SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=yes,SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=no)])
 108 if test x"$SMB_BUILD_CC_NEGATIVE_ENUM_VALUES" != x"yes"; then
 109         AC_MSG_WARN([using --unit-enums for pidl])
 110         PIDL_ARGS="$PIDL_ARGS --uint-enums"
 111 fi
 112
 113 AC_MSG_CHECKING([for test routines])
 114 AC_TRY_RUN([#include "${srcdir-.}/build/tests/trivial.c"],
 115             AC_MSG_RESULT(yes),
 116             AC_MSG_ERROR([cant find test code. Aborting config]),
 117             AC_MSG_WARN([cannot run when cross-compiling]))
 118
 119 #
 120 # Check if the compiler support ELF visibility for symbols
 121 #
 122 if test x"$GCC" = x"yes" ; then
 123     AX_CFLAGS_GCC_OPTION([-fvisibility=hidden], VISIBILITY_CFLAGS)
 124 fi
 125 if test -n "$VISIBILITY_CFLAGS"; then
 126         OLD_CFLAGS="${CFLAGS}"
 127         CFLAGS="${CFLAGS} ${VISIBILITY_CFLAGS} -D_PUBLIC_=__attribute__((visibility(\"default\")))"
 128         VISIBILITY_CFLAGS="${VISIBILITY_CFLAGS} -D_PUBLIC_=\"__attribute__((visibility(\\\"default\\\")))\""
 129         AC_MSG_CHECKING([that the C compiler can use the VISIBILITY_CFLAGS])
 130         AC_TRY_RUN([
 131                 _PUBLIC_ void vis_foo1(void) {}
 132                 __attribute__((visibility("default"))) void vis_foo2(void) {}
 133                 #include "${srcdir-.}/build/tests/trivial.c"
 134                 ], AC_MSG_RESULT(yes), [AC_MSG_RESULT(no);VISIBILITY_CFLAGS=""])
 135         CFLAGS="${OLD_CFLAGS}"
 136 fi
 137
 138 #
 139 # Check if the compiler can handle the options we selected by
 140 # --enable-*developer
 141 #
 142 DEVELOPER_CFLAGS=""
 143 if test x$developer = xyes; then
 144         DEVELOPER_CFLAGS="-DDEBUG_PASSWORD -DDEVELOPER"
 145         if test x"$GCC" = x"yes" ; then
 146             OLD_CFLAGS="${CFLAGS}"
 147             CFLAGS="${CFLAGS} -D_SAMBA_DEVELOPER_DONNOT_USE_O2_"
 148             AX_CFLAGS_GCC_OPTION(-Wall, DEVELOPER_CFLAGS)
 149             AX_CFLAGS_GCC_OPTION(-Wshadow, DEVELOPER_CFLAGS)
 150             AX_CFLAGS_GCC_OPTION(-Werror-implicit-function-declaration, DEVELOPER_CFLAGS)
 151             AX_CFLAGS_GCC_OPTION(-Wstrict-prototypes, DEVELOPER_CFLAGS)
 152             AX_CFLAGS_GCC_OPTION(-Wpointer-arith, DEVELOPER_CFLAGS)
 153             AX_CFLAGS_GCC_OPTION(-Wcast-qual, DEVELOPER_CFLAGS)
 154             AX_CFLAGS_GCC_OPTION(-Wcast-align, DEVELOPER_CFLAGS)
 155             AX_CFLAGS_GCC_OPTION(-Wwrite-strings, DEVELOPER_CFLAGS)
 156             AX_CFLAGS_GCC_OPTION(-Wmissing-format-attribute, DEVELOPER_CFLAGS)
 157             AX_CFLAGS_GCC_OPTION(-Wformat=2, DEVELOPER_CFLAGS)
 158             AX_CFLAGS_GCC_OPTION(-Wno-format-y2k, DEVELOPER_CFLAGS)
 159             AX_CFLAGS_GCC_OPTION(-Wno-declaration-after-statement, DEVELOPER_CFLAGS)
 160             CFLAGS="${OLD_CFLAGS}"
 161         fi
 162 fi
 163 if test -n "$DEVELOPER_CFLAGS"; then
 164         OLD_CFLAGS="${CFLAGS}"
 165         CFLAGS="${CFLAGS} ${DEVELOPER_CFLAGS}"
 166         AC_MSG_CHECKING([that the C compiler can use the DEVELOPER_CFLAGS])
 167         AC_TRY_RUN([#include "${srcdir-.}/build/tests/trivial.c"],
 168                 AC_MSG_RESULT(yes),
 169                 DEVELOPER_CFLAGS=""; AC_MSG_RESULT(no))
 170         CFLAGS="${OLD_CFLAGS}"
 171 fi
 172
 173 # allow for --with-hostcc=gcc
 174 AC_ARG_WITH(hostcc,[  --with-hostcc=compiler    choose host compiler],
 175 [HOSTCC=$withval],
 176 [
 177 if test z"$cross_compiling" = "yes"; then
 178         HOSTCC=cc
 179 else
 180         HOSTCC=$CC
 181 fi
 182 ])
 183 AC_SUBST(HOSTCC)
 184
 185 AC_PATH_PROG(GCOV,gcov)