m4/ax_cc.m4

   1 dnl #
   2 dnl # check if were compiling with CLANG, autoconf GCC macro identifies CLANG as GCC
   3 dnl #
   4 AC_DEFUN([AX_CC_IS_CLANG],[
   5   AC_CACHE_CHECK([if compiler is clang], [ax_cv_cc_clang],[
   6
   7   AC_COMPILE_IFELSE(
   8     [AC_LANG_PROGRAM([], [[
   9     #ifndef __clang__
  10          not clang
  11     #endif
  12     ]])],
  13     [ax_cv_cc_clang=yes],
  14     [ax_cv_cc_clang=no])
  15   ])
  16 ])
  17
  18 AC_DEFUN([AX_CC_QUNUSED_ARGUMENTS_FLAG],[
  19   AC_CACHE_CHECK([for the compiler flag "-Qunused-arguments"], [ax_cv_cc_qunused_arguments_flag],[
  20
  21     CFLAGS_SAVED=$CFLAGS
  22     CFLAGS="$CFLAGS -Werror -Qunused-arguments -foobar"
  23
  24     AC_LANG_PUSH(C)
  25     AC_TRY_COMPILE(
  26       [],
  27       [return 0;],
  28       [ax_cv_cc_qunused_arguments_flag="yes"],
  29       [ax_cv_cc_qunused_arguments_flag="no"])
  30     AC_LANG_POP
  31
  32     CFLAGS="$CFLAGS_SAVED"
  33   ])
  34 ])
  35
  36 AC_DEFUN([AX_CC_WEVERYTHING_FLAG],[
  37   AC_CACHE_CHECK([for the compiler flag "-Weverything"], [ax_cv_cc_weverything_flag],[
  38
  39     CFLAGS_SAVED=$CFLAGS
  40     CFLAGS="$CFLAGS -Werror -Weverything -Wno-unused-macros -Wno-unreachable-code-return"
  41
  42     AC_LANG_PUSH(C)
  43     AC_TRY_COMPILE(
  44       [],
  45       [return 0;],
  46       [ax_cv_cc_weverything_flag="yes"],
  47       [ax_cv_cc_weverything_flag="no"])
  48     AC_LANG_POP
  49
  50     CFLAGS="$CFLAGS_SAVED"
  51   ])
  52 ])
  53
  54 AC_DEFUN([AX_CC_WDOCUMENTATION_FLAG],[
  55   AC_CACHE_CHECK([for the compiler flag "-Wdocumentation"], [ax_cv_cc_wdocumentation_flag],[
  56
  57     CFLAGS_SAVED=$CFLAGS
  58     CFLAGS="$CFLAGS -Werror -Wdocumentation"
  59
  60     AC_LANG_PUSH(C)
  61     AC_TRY_COMPILE(
  62       [],
  63       [return 0;],
  64       [ax_cv_cc_wdocumentation_flag="yes"],
  65       [ax_cv_cc_wdocumentation_flag="no"])
  66     AC_LANG_POP
  67
  68     CFLAGS="$CFLAGS_SAVED"
  69   ])
  70 ])
  71
  72 AC_DEFUN([AX_CC_PTHREAD_FLAG],[
  73   AC_CACHE_CHECK([for the compiler flag "-pthread"], [ax_cv_cc_pthread_flag],[
  74
  75     CFLAGS_SAVED=$CFLAGS
  76     CFLAGS="$CFLAGS -Werror -pthread"
  77
  78     AC_LANG_PUSH(C)
  79     AC_TRY_COMPILE(
  80       [],
  81       [return 0;],
  82       [ax_cv_cc_pthread_flag="yes"],
  83       [ax_cv_cc_pthread_flag="no"])
  84     AC_LANG_POP
  85
  86     CFLAGS="$CFLAGS_SAVED"
  87   ])
  88 ])
  89
  90 dnl #
  91 dnl # Determine the number of system cores we have
  92 dnl #
  93 AC_DEFUN([AX_SYSTEM_CORES],[
  94   AC_CACHE_CHECK([number of system cores], [ax_cv_system_cores],
  95     [
  96       AC_LANG_PUSH(C)
  97       AC_TRY_RUN(
  98         [
  99           #include <stdio.h>
 100           #include <stdint.h>
 101           #ifdef _WIN32
 102           #  include <windows.h>
 103           #elif MACOS
 104           #  include <sys/param.h>
 105           #  include <sys/sysctl.h>
 106           #else
 107           #  include <unistd.h>
 108           #endif
 109
 110           int main (int argc, char *argv[])
 111           {
 112             uint32_t count;
 113
 114             #ifdef WIN32
 115             SYSTEM_INFO sysinfo;
 116             GetSystemInfo(&sysinfo);
 117
 118             count = sysinfo.dwNumberOfProcessors;
 119
 120             #elif MACOS
 121             int nm[2];
 122             size_t len = 4;
 123
 124             nm[0] = CTL_HW;
 125             nm[1] = HW_AVAILCPU;
 126             sysctl(nm, 2, &count, &len, NULL, 0);
 127
 128             if(count < 1) {
 129               nm[1] = HW_NCPU;
 130               sysctl(nm, 2, &count, &len, NULL, 0);
 131               if(count < 1) {
 132                 count = 1;
 133               }
 134             }
 135
 136             #else
 137             count = sysconf(_SC_NPROCESSORS_ONLN);
 138             #endif
 139
 140             return count;
 141           }
 142         ],
 143         [ax_cv_system_cores=$?],
 144         [ax_cv_system_cores=$?],
 145         [ax_cv_system_cores=]
 146     )
 147     AC_LANG_POP
 148   ])
 149 ])
 150