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libcares/m4/cares-compilers.m4  view on Meta::CPAN

dnl Sets compiler specific options/flags which do not
dnl depend on configure's debug, optimize or warnings
dnl options.

AC_DEFUN([CARES_SET_COMPILER_BASIC_OPTS], [
  AC_REQUIRE([CARES_CHECK_COMPILER])dnl
  AC_REQUIRE([CARES_SHFUNC_SQUEEZE])dnl
  #
  if test "$compiler_id" != "unknown"; then
    #
    if test "$compiler_id" = "GNU_C" ||
      test "$compiler_id" = "CLANG"; then
      CARES_CONVERT_INCLUDE_TO_ISYSTEM
    fi
    #
    tmp_save_CPPFLAGS="$CPPFLAGS"
    tmp_save_CFLAGS="$CFLAGS"
    tmp_CPPFLAGS=""
    tmp_CFLAGS=""
    #
    case "$compiler_id" in
        #
      CLANG)
        #
        dnl Disable warnings for unused arguments, otherwise clang will
        dnl warn about compile-time arguments used during link-time, like
        dnl -O and -g and -pedantic.
        tmp_CFLAGS="$tmp_CFLAGS -Qunused-arguments"
        ;;
        #
      DEC_C)
        #
        dnl Select strict ANSI C compiler mode
        tmp_CFLAGS="$tmp_CFLAGS -std1"
        dnl Turn off optimizer ANSI C aliasing rules
        tmp_CFLAGS="$tmp_CFLAGS -noansi_alias"
        dnl Generate warnings for missing function prototypes
        tmp_CFLAGS="$tmp_CFLAGS -warnprotos"
        dnl Change some warnings into fatal errors
        tmp_CFLAGS="$tmp_CFLAGS -msg_fatal toofewargs,toomanyargs"
        ;;
        #
      GNU_C)
        #
        dnl Placeholder
        tmp_CFLAGS="$tmp_CFLAGS"
        ;;
        #
      HP_UX_C)
        #
        dnl Disallow run-time dereferencing of null pointers
        tmp_CFLAGS="$tmp_CFLAGS -z"
        dnl Disable some remarks
        dnl #4227: padding struct with n bytes to align member
        dnl #4255: padding size of struct with n bytes to alignment boundary
        tmp_CFLAGS="$tmp_CFLAGS +W 4227,4255"
        ;;
        #
      IBM_C)
        #
        dnl Ensure that compiler optimizations are always thread-safe.
        tmp_CPPFLAGS="$tmp_CPPFLAGS -qthreaded"
        dnl Disable type based strict aliasing optimizations, using worst
        dnl case aliasing assumptions when compiling. Type based aliasing
        dnl would restrict the lvalues that could be safely used to access
        dnl a data object.
        tmp_CPPFLAGS="$tmp_CPPFLAGS -qnoansialias"
        dnl Force compiler to stop after the compilation phase, without
        dnl generating an object code file when compilation has errors.
        tmp_CPPFLAGS="$tmp_CPPFLAGS -qhalt=e"
        ;;
        #
      INTEL_UNIX_C)
        #
        dnl On unix this compiler uses gcc's header files, so
        dnl we select ANSI C89 dialect plus GNU extensions.
        tmp_CFLAGS="$tmp_CFLAGS -std=gnu89"
        dnl Change some warnings into errors
        dnl #140: too many arguments in function call
        dnl #147: declaration is incompatible with 'previous one'
        dnl #165: too few arguments in function call
        dnl #266: function declared implicitly
        tmp_CPPFLAGS="$tmp_CPPFLAGS -we 140,147,165,266"
        dnl Disable some remarks
        dnl #279: controlling expression is constant
        dnl #981: operands are evaluated in unspecified order
        dnl #1469: "cc" clobber ignored
        tmp_CPPFLAGS="$tmp_CPPFLAGS -wd 279,981,1469"
        ;;
        #
      INTEL_WINDOWS_C)
        #
        dnl Placeholder
        tmp_CFLAGS="$tmp_CFLAGS"
        ;;
        #
      LCC)
        #
        dnl Disallow run-time dereferencing of null pointers
        tmp_CFLAGS="$tmp_CFLAGS -n"
        ;;
        #
      SGI_MIPS_C)
        #
        dnl Placeholder
        tmp_CFLAGS="$tmp_CFLAGS"
        ;;
        #
      SGI_MIPSPRO_C)
        #
        dnl Placeholder
        tmp_CFLAGS="$tmp_CFLAGS"
        ;;
        #
      SUNPRO_C)
        #
        dnl Placeholder
        tmp_CFLAGS="$tmp_CFLAGS"
        ;;
        #
      TINY_C)
        #