acinclude/compiler-flags.m4

   1 ## Copyright (C) 1996-2017 The Squid Software Foundation and contributors
   2 ##
   3 ## Squid software is distributed under GPLv2+ license and includes
   4 ## contributions from numerous individuals and organizations.
   5 ## Please see the COPYING and CONTRIBUTORS files for details.
   6 ##
   7
   8 # check if the compiler accepts a supplied flag
   9 # first argument is the variable containing the result
  10 # (will be set to "yes" or "no")
  11 # second argument is the flag to be tested, verbatim
  12 #
  13 AC_DEFUN([SQUID_CC_CHECK_ARGUMENT],[
  14   AC_CACHE_CHECK([whether compiler accepts $2],[$1],
  15   [{
  16     AC_REQUIRE([AC_PROG_CC])
  17     SAVED_CFLAGS="$CFLAGS"
  18     SAVED_CXXFLAGS="$CXXFLAGS"
  19     CFLAGS="$CFLAGS $2"
  20     CXXFLAGS="$CXXFLAGS $2"
  21     AC_TRY_LINK([],[int foo; ],
  22       [$1=yes],[$1=no])
  23     CFLAGS="$SAVED_CFLAGS"
  24     CXXFLAGS="$SAVED_CXXFLAGS"
  25   }])
  26 ])
  27
  28 # Check if the compiler requires a supplied flag to build a test program.
  29 # When cross-compiling set flags explicitly.
  30 #
  31 # first argument is the variable containing the result
  32 # (will be set to "yes" or "no")
  33 # second argument is the flag to be tested, verbatim
  34 # third is the #include and global setup for test program, verbatim
  35 # fourth is the test program to compile, verbatim
  36 #
  37 AC_DEFUN([SQUID_CC_REQUIRE_ARGUMENT],[
  38   AC_CACHE_CHECK([whether compiler requires $2],[$1],
  39   [{
  40     AC_REQUIRE([AC_PROG_CC])
  41     SAVED_CFLAGS="$CFLAGS"
  42     SAVED_CXXFLAGS="$CXXFLAGS"
  43     AC_COMPILE_IFELSE([AC_LANG_PROGRAM($3,$4)],[$1=no],[],[$1=no])
  44     if test "x$1" != "xno" ; then
  45       CFLAGS="$CFLAGS $2"
  46       CXXFLAGS="$CXXFLAGS $2"
  47       AC_COMPILE_IFELSE([AC_LANG_PROGRAM($3,$4)],[$1=yes],[$1=no],[$1=no])
  48     fi
  49     CFLAGS="$SAVED_CFLAGS"
  50     CXXFLAGS="$SAVED_CXXFLAGS"
  51   }])
  52 ])
  53
  54 # detect what kind of compiler we're using, either by using hints from
  55 # autoconf itself, or by using predefined preprocessor macros
  56 # sets the variable squid_cv_compiler to one of
  57 #  - gcc
  58 #  - sunstudio
  59 #  - none (undetected)
  60 #
  61 AC_DEFUN([SQUID_CC_GUESS_VARIANT], [
  62  AC_CACHE_CHECK([what kind of compiler we're using],[squid_cv_compiler],
  63  [
  64   AC_REQUIRE([AC_PROG_CC])
  65   dnl repeat the next block for each compiler, changing the
  66   dnl preprocessor definition so that it depends on platform-specific
  67   dnl predefined macros
  68   dnl SunPro CC
  69   if test -z "$squid_cv_compiler" ; then
  70    AC_COMPILE_IFELSE([
  71     AC_LANG_PROGRAM([[
  72 #if !defined(__SUNPRO_C) && !defined(__SUNPRO_CC)
  73 #error "not sunpro c"
  74 #endif
  75     ]])],[squid_cv_compiler="sunstudio"],[])
  76   fi
  77   dnl Intel CC
  78   if test -z "$squid_cv_compiler" ; then
  79    AC_COMPILE_IFELSE([
  80     AC_LANG_PROGRAM([[
  81 #if !defined(__ICC)
  82 #error "not Intel(R) C++ Compiler"
  83 #endif
  84     ]])],[squid_cv_compiler="icc"],[])
  85   fi
  86   dnl clang
  87   if test -z "$squid_cv_compiler" ; then
  88    AC_COMPILE_IFELSE([
  89     AC_LANG_PROGRAM([[
  90 #if !defined(__clang__)
  91 #error "not clang"
  92 #endif
  93     ]])],[squid_cv_compiler="clang"],[])
  94   fi
  95   dnl microsoft visual c++
  96   if test -z "$squid_cv_compiler" ; then
  97    AC_COMPILE_IFELSE([
  98     AC_LANG_PROGRAM([[
  99 #if !defined(_MSC_VER)
 100 #error "not Microsoft VC++"
 101 #endif
 102     ]])],[squid_cv_compiler="msvc"],[])
 103   fi
 104   dnl gcc. MUST BE LAST as many other compilers also define it for compatibility
 105   if test -z "$squid_cv_compiler" ; then
 106    AC_COMPILE_IFELSE([
 107     AC_LANG_PROGRAM([[
 108 #if !defined(__GNUC__)
 109 #error "not gcc"
 110 #endif
 111     ]])],[squid_cv_compiler="gcc"],[])
 112   fi
 113   dnl end of block to be repeated
 114   if test -z "$squid_cv_compiler" ; then
 115    squid_cv_compiler="none"
 116   fi
 117   ]) dnl AC_CACHE_CHECK
 118  ]) dnl AC_DEFUN
 119
 120 # define the flag to use to have the compiler treat warnings as errors
 121 # requirs SQUID_CC_GUESS_VARIANT
 122 # Sets a few variables to contain some compiler-dependent command line
 123 # options, or to empty strings if the compiler doesn't support those
 124 # options
 125 # They are (with their GCC equivalent):
 126 # squid_cv_cc_option_werror   (-Werror)
 127 # squid_cv_cxx_option_werror  (-Werror)
 128 # squid_cv_cc_option_wall     (-Wall)
 129 # squid_cv_cc_option_optimize (-O3)
 130 #
 131 AC_DEFUN([SQUID_CC_GUESS_OPTIONS], [
 132  AC_REQUIRE([SQUID_CC_GUESS_VARIANT])
 133  AC_MSG_CHECKING([for compiler variant])
 134  case "$squid_cv_compiler" in
 135   gcc)
 136    squid_cv_cc_option_werror="-Werror"
 137    squid_cv_cxx_option_werror="-Werror"
 138    squid_cv_cc_option_wall="-Wall"
 139    squid_cv_cc_option_optimize="-O3"
 140    squid_cv_cc_arg_pipe="-pipe"
 141    ;;
 142   sunstudio)
 143    squid_cv_cc_option_werror="-errwarn=%all -errtags"
 144    squid_cv_cxx_option_werror="-errwarn=%all,no%badargtype2w,no%wbadinit,no%wbadasg -errtags"
 145    squid_cv_cc_option_wall="+w"
 146    squid_cv_cc_option_optimize="-fast"
 147    squid_cv_cc_arg_pipe=""
 148    ;;
 149   clang)
 150    squid_cv_cxx_option_werror="-Werror -Qunused-arguments"
 151    squid_cv_cc_option_werror="$squid_cv_cxx_option_werror"
 152    squid_cv_cc_option_wall="-Wall"
 153    squid_cv_cc_option_optimize="-O2"
 154    squid_cv_cc_arg_pipe=""
 155    ;;
 156   icc)
 157    squid_cv_cxx_option_werror="-Werror"
 158    squid_cv_cc_option_werror="$squid_cv_cxx_option_werror"
 159    squid_cv_cc_option_wall="-Wall"
 160    squid_cv_cc_option_optimize="-O2"
 161    squid_cv_cc_arg_pipe=""
 162    ;;
 163   *)
 164    squid_cv_cxx_option_werror=""
 165    squid_cv_cc_option_werror=""
 166    squid_cv_cc_option_wall=""
 167    squid_cv_cc_option_optimize="-O"
 168    squid_cv_cc_arg_pipe=""
 169    ;;
 170  esac
 171  AC_MSG_RESULT([$squid_cv_compiler])
 172 ])