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_PROG_CC
   9 if test x"$CC" = x""; then
  10         AC_MSG_WARN([No c compiler was not found!])
  11         AC_MSG_ERROR([Please Install gcc from http://gcc.gnu.org/])
  12 fi
  13
  14 AC_C_INLINE
  15
  16 dnl needed before AC_TRY_COMPILE
  17 AC_ISC_POSIX
  18
  19 dnl Check if C compiler understands -c and -o at the same time
  20 AC_PROG_CC_C_O
  21 if eval "test \"`echo '$ac_cv_prog_cc_'${ac_cc}_c_o`\" = no"; then
  22         BROKEN_CC=
  23 else
  24         BROKEN_CC=#
  25 fi
  26 AC_SUBST(BROKEN_CC)
  27
  28 AC_CACHE_CHECK([that the C compiler can precompile header files],samba_cv_precompiled_headers, [
  29         dnl Check whether the compiler can generate precompiled headers
  30         touch conftest.h
  31         if ${CC-cc} conftest.h 2> /dev/null && test -f conftest.h.gch; then
  32                 samba_cv_precompiled_headers=yes
  33         else
  34                 samba_cv_precompiled_headers=no
  35         fi])
  36 PCH_AVAILABLE="#"
  37 if test x"$samba_cv_precompiled_headers" = x"yes"; then
  38         PCH_AVAILABLE=""
  39 fi
  40 AC_SUBST(PCH_AVAILABLE)
  41
  42
  43 dnl Check if the C compiler understands volatile (it should, being ANSI).
  44 AC_CACHE_CHECK([that the C compiler understands volatile],samba_cv_volatile, [
  45         AC_TRY_COMPILE([#include <sys/types.h>],[volatile int i = 0],
  46                 samba_cv_volatile=yes,samba_cv_volatile=no)])
  47 if test x"$samba_cv_volatile" = x"yes"; then
  48         AC_DEFINE(HAVE_VOLATILE, 1, [Whether the C compiler understands volatile])
  49 fi
  50
  51 ############################################
  52 # check if the compiler can do immediate structures
  53 AC_CACHE_CHECK([for immediate structures],samba_cv_immediate_structures, [
  54     AC_TRY_COMPILE([
  55 #include <stdio.h>],
  56 [
  57    typedef struct {unsigned x;} FOOBAR;
  58    #define X_FOOBAR(x) ((FOOBAR) { x })
  59    #define FOO_ONE X_FOOBAR(1)
  60    FOOBAR f = FOO_ONE;
  61    static struct {
  62         FOOBAR y;
  63         } f2[] = {
  64                 {FOO_ONE}
  65         };
  66 ],
  67         samba_cv_immediate_structures=yes,samba_cv_immediate_structures=no)])
  68 if test x"$samba_cv_immediate_structures" = x"yes"; then
  69    AC_DEFINE(HAVE_IMMEDIATE_STRUCTURES,1,[Whether the compiler supports immediate structures])
  70 fi
  71
  72 ############################################
  73 # check if the compiler can handle negative enum values
  74 AC_CACHE_CHECK([that the C compiler understands negative enum values],SMB_BUILD_CC_NEGATIVE_ENUM_VALUES, [
  75     AC_TRY_COMPILE([
  76 #include <stdio.h>],
  77 [
  78         enum negative_values { NEGATIVE_VALUE = 0xFFFFFFFF };
  79 ],
  80         SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=yes,SMB_BUILD_CC_NEGATIVE_ENUM_VALUES=no)])
  81 if test x"$SMB_BUILD_CC_NEGATIVE_ENUM_VALUES" != x"yes"; then
  82         AC_MSG_WARN([using --unit-enums for pidl])
  83         PIDL_ARGS="$PIDL_ARGS --uint-enums"
  84 fi
  85
  86 AC_MSG_CHECKING([for test routines])
  87 AC_TRY_RUN([#include "${srcdir-.}/build/tests/trivial.c"],
  88             AC_MSG_RESULT(yes),
  89             AC_MSG_ERROR([cant find test code. Aborting config]),
  90             AC_MSG_WARN([cannot run when cross-compiling]))
  91
  92 #
  93 # Check if the compiler can handle the options we selected by
  94 # --enable-*developer
  95 #
  96 if test -n "$DEVELOPER_CFLAGS"; then
  97         OLD_CFLAGS="${CFLAGS}"
  98         CFLAGS="${CFLAGS} ${DEVELOPER_CFLAGS}"
  99         AC_MSG_CHECKING([that the C compiler can use the DEVELOPER_CFLAGS])
 100         AC_TRY_RUN([#include "${srcdir-.}/build/tests/trivial.c"],
 101                 AC_MSG_RESULT(yes),
 102                 DEVELOPER_CFLAGS=""; AC_MSG_RESULT(no),
 103                 AC_MSG_WARN([cannot run when cross-compiling]))
 104         CFLAGS="${OLD_CFLAGS}"
 105 fi
 106
 107 # allow for --with-hostcc=gcc
 108 AC_ARG_WITH(hostcc,[  --with-hostcc=compiler    choose host compiler],[HOSTCC=$withval],[HOSTCC=$CC])
 109 AC_SUBST(HOSTCC)