# # 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* ])]) AC_DEFUN([AC_EXTENSION_FLAG], [ cat >>confdefs.h <<\EOF #ifndef $1 # define $1 1 #endif EOF AH_VERBATIM([$1], [#ifndef $1 # define $1 1 #endif]) ]) 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 ]) dnl remove an #include dnl AC_REMOVE_INCLUDE(VARIABLE) define(AC_REMOVE_INCLUDE, [ grep -v '[#include] $1' confdefs.h >confdefs.h.tmp cat confdefs.h.tmp > confdefs.h rm confdefs.h.tmp ]) dnl remove an #define dnl AC_REMOVE_DEFINE(VARIABLE) define(AC_REMOVE_DEFINE, [ grep -v '[#define] $1 ' confdefs.h |grep -v '[#define] $1[$]'>confdefs.h.tmp cat confdefs.h.tmp > confdefs.h rm confdefs.h.tmp ]) dnl AS_HELP_STRING is not available in autoconf 2.57, and AC_HELP_STRING is deprecated dnl in autoconf 2.59, so define AS_HELP_STRING to be AC_HELP_STRING unless it is already dnl defined. m4_ifdef([AS_HELP_STRING], , [m4_define([AS_HELP_STRING], m4_defn([AC_HELP_STRING]))]) dnl check if the prototype in the header matches the given one dnl AC_VERIFY_C_PROTOTYPE(prototype,functionbody,[IF-TRUE].[IF-FALSE],[extraheaders]) AC_DEFUN(AC_VERIFY_C_PROTOTYPE, [AC_CACHE_CHECK([for prototype $1], AS_TR_SH([ac_cv_c_prototype_$1]), AC_COMPILE_IFELSE([ AC_INCLUDES_DEFAULT $5 $1 { $2 } ],[ AS_TR_SH([ac_cv_c_prototype_$1])=yes ],[ AS_TR_SH([ac_cv_c_prototype_$1])=no ]) ) AS_IF([test $AS_TR_SH([ac_cv_c_prototype_$1]) = yes],[$3],[$4]) ]) AC_DEFUN(LIBREPLACE_PROVIDE_HEADER, [AC_CHECK_HEADER([$1], [ AC_CONFIG_COMMANDS(rm-$1, [rm -f $libreplacedir/$1], [libreplacedir=$libreplacedir]) ], [ AC_CONFIG_COMMANDS(mk-$1, [echo "#include \"replace.h\"" > $libreplacedir/$1], [libreplacedir=$libreplacedir]) ] ) ])