Commit 273b2b23 authored by Yang Tse's avatar Yang Tse
Browse files

Add check for compiler variadic macro support in configuration script

parent 3229a80c

acinclude.m4

+64 −0
Original line number Diff line number Diff line
@@ -1963,3 +1963,67 @@ main() 
    dnl if this test fails, configure has already stopped

  fi

])





dnl CURL_CHECK_VARIADIC_MACROS

dnl -------------------------------------------------

dnl Check compiler support of variadic macros



AC_DEFUN([CURL_CHECK_VARIADIC_MACROS], [

  AC_CACHE_CHECK([for compiler support of C99 variadic macro style],

    [curl_cv_variadic_macros_c99], [

    AC_COMPILE_IFELSE([

      AC_LANG_PROGRAM([

#define c99_vmacro3(first, ...) fun3(first, __VA_ARGS__)

#define c99_vmacro2(first, ...) fun2(first, __VA_ARGS__)

        int fun3(int arg1, int arg2, int arg3);

        int fun2(int arg1, int arg2);

        int fun3(int arg1, int arg2, int arg3)

        { return arg1 + arg2 + arg3; }

        int fun2(int arg1, int arg2)

        { return arg1 + arg2; }

      ],[

        int res3 = c99_vmacro3(1, 2, 3);

        int res2 = c99_vmacro2(1, 2);

      ])

    ],[

      curl_cv_variadic_macros_c99="yes"

    ],[

      curl_cv_variadic_macros_c99="no"

    ])

  ])

  case "$curl_cv_variadic_macros_c99" in

    yes)

      AC_DEFINE_UNQUOTED(HAVE_VARIADIC_MACROS_C99, 1,

        [Define to 1 if compiler supports C99 variadic macro style.])

      ;;

  esac

  AC_CACHE_CHECK([for compiler support of old gcc variadic macro style],

    [curl_cv_variadic_macros_gcc], [

    AC_COMPILE_IFELSE([

      AC_LANG_PROGRAM([

#define gcc_vmacro3(first, args...) fun3(first, args)

#define gcc_vmacro2(first, args...) fun2(first, args)

        int fun3(int arg1, int arg2, int arg3);

        int fun2(int arg1, int arg2);

        int fun3(int arg1, int arg2, int arg3)

        { return arg1 + arg2 + arg3; }

        int fun2(int arg1, int arg2)

        { return arg1 + arg2; }

      ],[

        int res3 = c99_vmacro3(1, 2, 3);

        int res2 = c99_vmacro2(1, 2);

      ])

    ],[

      curl_cv_variadic_macros_gcc="yes"

    ],[

      curl_cv_variadic_macros_gcc="no"

    ])

  ])

  case "$curl_cv_variadic_macros_gcc" in

    yes)

      AC_DEFINE_UNQUOTED(HAVE_VARIADIC_MACROS_GCC, 1,

        [Define to 1 if compiler supports old gcc variadic macro style.])

      ;;

  esac

])

configure.ac

+1 −0
Original line number Diff line number Diff line
@@ -1739,6 +1739,7 @@ dnl default includes 


dnl Checks for typedefs, structures, and compiler characteristics.

AC_C_CONST

CURL_CHECK_VARIADIC_MACROS

AC_TYPE_SIZE_T

AC_HEADER_TIME

CURL_CHECK_STRUCT_TIMEVAL