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#
# This is a collection of useful autoconf macros
#
############################################
# Check if the compiler handles c99 struct initialization, and if not try -AC99 and -c99 flags
# Usage: LIBREPLACE_C99_STRUCT_INIT(success-action,failure-action)
# changes CFLAGS to add -AC99 or -c99 if needed
AC_DEFUN([LIBREPLACE_C99_STRUCT_INIT],
[
saved_CFLAGS="$CFLAGS";
c99_init=no
if test x"$c99_init" = x"no"; then
AC_MSG_CHECKING(for C99 designated initializers)
CFLAGS="$saved_CFLAGS";
AC_TRY_COMPILE([#include <stdio.h>],
[ struct foo {int x;char y;};
struct foo bar = { .y = 'X', .x = 1 };
],
[AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
fi
if test x"$c99_init" = x"no"; then
AC_MSG_CHECKING(for C99 designated initializers with -AC99)
CFLAGS="$saved_CFLAGS -AC99";
AC_TRY_COMPILE([#include <stdio.h>],
[ struct foo {int x;char y;};
struct foo bar = { .y = 'X', .x = 1 };
],
[AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
fi
if test x"$c99_init" = x"no"; then
AC_MSG_CHECKING(for C99 designated initializers with -qlanglvl=extc99)
CFLAGS="$saved_CFLAGS -qlanglvl=extc99";
AC_TRY_COMPILE([#include <stdio.h>],
[ struct foo {int x;char y;};
struct foo bar = { .y = 'X', .x = 1 };
],
[AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
fi
if test x"$c99_init" = x"no"; then
AC_MSG_CHECKING(for C99 designated initializers with -qlanglvl=stdc99)
CFLAGS="$saved_CFLAGS -qlanglvl=stdc99";
AC_TRY_COMPILE([#include <stdio.h>],
[ struct foo {int x;char y;};
struct foo bar = { .y = 'X', .x = 1 };
],
[AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
fi
if test x"$c99_init" = x"no"; then
AC_MSG_CHECKING(for C99 designated initializers with -c99)
CFLAGS="$saved_CFLAGS -c99"
AC_TRY_COMPILE([#include <stdio.h>],
[ struct foo {int x;char y;};
struct foo bar = { .y = 'X', .x = 1 };
],
[AC_MSG_RESULT(yes); c99_init=yes],[AC_MSG_RESULT(no)])
fi
if test "`uname`" = "HP-UX"; then
if test "$ac_cv_c_compiler_gnu" = no; then
# special override for broken HP-UX compiler - I can't find a way to test
# this properly (its a compiler bug)
CFLAGS="$CFLAGS -AC99";
c99_init=yes;
fi
fi
if test x"$c99_init" = x"yes"; then
saved_CFLAGS=""
$1
else
CFLAGS="$saved_CFLAGS"
saved_CFLAGS=""
$2
fi
])
dnl AC_PROG_CC_FLAG(flag)
AC_DEFUN(AC_PROG_CC_FLAG,
[AC_CACHE_CHECK(whether ${CC-cc} accepts -$1, ac_cv_prog_cc_$1,
[echo 'void f(){}' > conftest.c
if test -z "`${CC-cc} -$1 -c conftest.c 2>&1`"; then
ac_cv_prog_cc_$1=yes
else
ac_cv_prog_cc_$1=no
fi
rm -f conftest*
])])
dnl see if a declaration exists for a function or variable
dnl defines HAVE_function_DECL if it exists
dnl AC_HAVE_DECL(var, includes)
AC_DEFUN(AC_HAVE_DECL,
[
AC_CACHE_CHECK([for $1 declaration],ac_cv_have_$1_decl,[
AC_TRY_COMPILE([$2],[int i = (int)$1],
ac_cv_have_$1_decl=yes,ac_cv_have_$1_decl=no)])
if test x"$ac_cv_have_$1_decl" = x"yes"; then
AC_DEFINE([HAVE_]translit([$1], [a-z], [A-Z])[_DECL],1,[Whether $1() is available])
fi
])
# AC_CHECK_LIB_EXT(LIBRARY, [EXT_LIBS], [FUNCTION],
# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
# [ADD-ACTION-IF-FOUND],[OTHER-LIBRARIES])
# ------------------------------------------------------
#
# Use a cache variable name containing both the library and function name,
# because the test really is for library $1 defining function $3, not
# just for library $1. Separate tests with the same $1 and different $3s
# may have different results.
#
# Note that using directly AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$3])
# is asking for trouble, since AC_CHECK_LIB($lib, fun) would give
# ac_cv_lib_$lib_fun, which is definitely not what was meant. Hence
# the AS_LITERAL_IF indirection.
#
# FIXME: This macro is extremely suspicious. It DEFINEs unconditionally,
# whatever the FUNCTION, in addition to not being a *S macro. Note
# that the cache does depend upon the function we are looking for.
#
# It is on purpose we used `ac_check_lib_ext_save_LIBS' and not just
# `ac_save_LIBS': there are many macros which don't want to see `LIBS'
# changed but still want to use AC_CHECK_LIB_EXT, so they save `LIBS'.
# And ``ac_save_LIBS' is too tempting a name, so let's leave them some
# freedom.
AC_DEFUN([AC_CHECK_LIB_EXT],
[
AH_CHECK_LIB_EXT([$1])
ac_check_lib_ext_save_LIBS=$LIBS
LIBS="-l$1 $$2 $7 $LIBS"
AS_LITERAL_IF([$1],
[AS_VAR_PUSHDEF([ac_Lib_ext], [ac_cv_lib_ext_$1])],
[AS_VAR_PUSHDEF([ac_Lib_ext], [ac_cv_lib_ext_$1''])])dnl
m4_ifval([$3],
[
AH_CHECK_FUNC_EXT([$3])
AS_LITERAL_IF([$1],
[AS_VAR_PUSHDEF([ac_Lib_func], [ac_cv_lib_ext_$1_$3])],
[AS_VAR_PUSHDEF([ac_Lib_func], [ac_cv_lib_ext_$1''_$3])])dnl
AC_CACHE_CHECK([for $3 in -l$1], ac_Lib_func,
[AC_TRY_LINK_FUNC($3,
[AS_VAR_SET(ac_Lib_func, yes);
AS_VAR_SET(ac_Lib_ext, yes)],
[AS_VAR_SET(ac_Lib_func, no);
AS_VAR_SET(ac_Lib_ext, no)])
])
AS_IF([test AS_VAR_GET(ac_Lib_func) = yes],
[AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_$3))])dnl
AS_VAR_POPDEF([ac_Lib_func])dnl
],[
AC_CACHE_CHECK([for -l$1], ac_Lib_ext,
[AC_TRY_LINK_FUNC([main],
[AS_VAR_SET(ac_Lib_ext, yes)],
[AS_VAR_SET(ac_Lib_ext, no)])
])
])
LIBS=$ac_check_lib_ext_save_LIBS
AS_IF([test AS_VAR_GET(ac_Lib_ext) = yes],
[m4_default([$4],
[AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_LIB$1))
case "$$2" in
*-l$1*)
;;
*)
$2="-l$1 $$2"
;;
esac])
[$6]
],
[$5])dnl
AS_VAR_POPDEF([ac_Lib_ext])dnl
])# AC_CHECK_LIB_EXT
# AH_CHECK_LIB_EXT(LIBNAME)
# ---------------------
m4_define([AH_CHECK_LIB_EXT],
[AH_TEMPLATE(AS_TR_CPP(HAVE_LIB$1),
[Define to 1 if you have the `]$1[' library (-l]$1[).])])
dnl AC_SEARCH_LIBS_EXT(FUNCTION, SEARCH-LIBS, EXT_LIBS,
dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
dnl [OTHER-LIBRARIES])
dnl --------------------------------------------------------
dnl Search for a library defining FUNC, if it's not already available.
AC_DEFUN([AC_SEARCH_LIBS_EXT],
[AC_CACHE_CHECK([for library containing $1], [ac_cv_search_ext_$1],
[
ac_func_search_ext_save_LIBS=$LIBS
ac_cv_search_ext_$1=no
AC_LINK_IFELSE([AC_LANG_CALL([], [$1])],
[ac_cv_search_ext_$1="none required"])
if test "$ac_cv_search_ext_$1" = no; then
for ac_lib in $2; do
LIBS="-l$ac_lib $$3 $6 $ac_func_search_save_ext_LIBS"
AC_LINK_IFELSE([AC_LANG_CALL([], [$1])],
[ac_cv_search_ext_$1="-l$ac_lib"
break])
done
fi
LIBS=$ac_func_search_ext_save_LIBS])
AS_IF([test "$ac_cv_search_ext_$1" != no],
[test "$ac_cv_search_ext_$1" = "none required" || $3="$ac_cv_search_ext_$1 $$3"
$4],
[$5])dnl
])
dnl check for a function in a $LIBS and $OTHER_LIBS libraries variable.
dnl AC_CHECK_FUNC_EXT(func,OTHER_LIBS,IF-TRUE,IF-FALSE)
AC_DEFUN([AC_CHECK_FUNC_EXT],
[
AH_CHECK_FUNC_EXT($1)
ac_check_func_ext_save_LIBS=$LIBS
LIBS="$2 $LIBS"
AS_VAR_PUSHDEF([ac_var], [ac_cv_func_ext_$1])dnl
AC_CACHE_CHECK([for $1], ac_var,
[AC_LINK_IFELSE([AC_LANG_FUNC_LINK_TRY([$1])],
[AS_VAR_SET(ac_var, yes)],
[AS_VAR_SET(ac_var, no)])])
LIBS=$ac_check_func_ext_save_LIBS
AS_IF([test AS_VAR_GET(ac_var) = yes],
[AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_$1])) $3],
[$4])dnl
AS_VAR_POPDEF([ac_var])dnl
])# AC_CHECK_FUNC
# AH_CHECK_FUNC_EXT(FUNCNAME)
# ---------------------
m4_define([AH_CHECK_FUNC_EXT],
[AH_TEMPLATE(AS_TR_CPP(HAVE_$1),
[Define to 1 if you have the `]$1[' function.])])
dnl Define an AC_DEFINE with ifndef guard.
dnl AC_N_DEFINE(VARIABLE [, VALUE])
define(AC_N_DEFINE,
[cat >> confdefs.h <<\EOF
[#ifndef] $1
[#define] $1 ifelse($#, 2, [$2], $#, 3, [$2], 1)
[#endif]
EOF
])
dnl Add an #include
dnl AC_ADD_INCLUDE(VARIABLE)
define(AC_ADD_INCLUDE,
[cat >> confdefs.h <<\EOF
[#include] $1
EOF
])
|
