| dnl Fix Autoconf bugs by overriding broken internal Autoconf |
| dnl macros with backports of fixes from newer releases. |
| dnl |
| dnl The override bits of this file should be a no-op for the newest |
| dnl Autoconf version, which means they can be removed once the complete |
| dnl tree has moved to a new enough Autoconf version. |
| dnl |
| dnl The _GCC_AUTOCONF_VERSION_TEST ensures that exactly the desired |
| dnl Autoconf version is used. It should be kept for consistency. |
| |
| dnl Use ifdef/ifelse over m4_ifdef/m4_ifelse to be clean for 2.13. |
| ifdef([m4_PACKAGE_VERSION], [ |
| |
| dnl Provide m4_copy_force and m4_rename_force for old Autoconf versions. |
| |
| m4_ifndef([m4_copy_force], |
| [m4_define([m4_copy_force], |
| [m4_ifdef([$2], [m4_undefine([$2])])m4_copy($@)])]) |
| |
| m4_ifndef([m4_rename_force], |
| [m4_define([m4_rename_force], |
| [m4_ifdef([$2], [m4_undefine([$2])])m4_rename($@)])]) |
| |
| dnl AC_DEFUN a commonly used macro so this file is picked up. |
| m4_copy([AC_PREREQ], [_AC_PREREQ]) |
| AC_DEFUN([AC_PREREQ], [frob]) |
| m4_copy_force([_AC_PREREQ], [AC_PREREQ]) |
| |
| |
| dnl Ensure exactly this Autoconf version is used |
| m4_ifndef([_GCC_AUTOCONF_VERSION], |
| [m4_define([_GCC_AUTOCONF_VERSION], [2.69])]) |
| |
| dnl Test for the exact version when AC_INIT is expanded. |
| dnl This allows to update the tree in steps (for testing) |
| dnl by putting |
| dnl m4_define([_GCC_AUTOCONF_VERSION], [X.Y]) |
| dnl in configure.ac before AC_INIT, |
| dnl without rewriting this file. |
| dnl Or for updating the whole tree at once with the definition above. |
| AC_DEFUN([_GCC_AUTOCONF_VERSION_CHECK], |
| [m4_if(m4_defn([_GCC_AUTOCONF_VERSION]), |
| m4_defn([m4_PACKAGE_VERSION]), [], |
| [m4_fatal([Please use exactly Autoconf ]_GCC_AUTOCONF_VERSION[ instead of ]m4_defn([m4_PACKAGE_VERSION])[.])]) |
| ]) |
| m4_define([AC_INIT], m4_defn([AC_INIT])[ |
| _GCC_AUTOCONF_VERSION_CHECK |
| ]) |
| |
| |
| dnl Ensure we do not use a buggy M4. |
| m4_if(m4_index([..wi.d.], [.d.]), [-1], |
| [m4_fatal(m4_do([m4 with buggy strstr detected. Please install |
| GNU M4 1.4.16 or newer and set the M4 environment variable]))]) |
| |
| |
| dnl Fix 2.64 cross compile detection for AVR and RTEMS |
| dnl by not trying to compile fopen. |
| m4_if(m4_defn([m4_PACKAGE_VERSION]), [2.64], |
| [m4_foreach([_GCC_LANG], [C, C++, Fortran, Fortran 77], |
| [m4_define([_AC_LANG_IO_PROGRAM(]_GCC_LANG[)], m4_defn([AC_LANG_PROGRAM(]_GCC_LANG[)]))])]) |
| |
| m4_version_prereq([2.66],, [ |
| dnl We need AC_CHECK_DECL which works for overloaded C++ functions. |
| |
| # _AC_CHECK_DECL_BODY |
| # ------------------- |
| # Shell function body for AC_CHECK_DECL. |
| m4_define([_AC_CHECK_DECL_BODY], |
| [ AS_LINENO_PUSH([$[]1]) |
| [as_decl_name=`echo $][2|sed 's/ *(.*//'`] |
| [as_decl_use=`echo $][2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`] |
| AC_CACHE_CHECK([whether $as_decl_name is declared], [$[]3], |
| [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$[]4], |
| [@%:@ifndef $[]as_decl_name |
| @%:@ifdef __cplusplus |
| (void) $[]as_decl_use; |
| @%:@else |
| (void) $[]as_decl_name; |
| @%:@endif |
| @%:@endif |
| ])], |
| [AS_VAR_SET([$[]3], [yes])], |
| [AS_VAR_SET([$[]3], [no])])]) |
| AS_LINENO_POP |
| ])# _AC_CHECK_DECL_BODY |
| |
| # _AC_CHECK_DECLS(SYMBOL, ACTION-IF_FOUND, ACTION-IF-NOT-FOUND, |
| # INCLUDES) |
| # ------------------------------------------------------------- |
| # Helper to AC_CHECK_DECLS, which generates the check for a single |
| # SYMBOL with INCLUDES, performs the AC_DEFINE, then expands |
| # ACTION-IF-FOUND or ACTION-IF-NOT-FOUND. |
| m4_define([_AC_CHECK_DECLS], |
| [AC_CHECK_DECL([$1], [ac_have_decl=1], [ac_have_decl=0], [$4])]dnl |
| [AC_DEFINE_UNQUOTED(AS_TR_CPP(m4_bpatsubst(HAVE_DECL_[$1],[ *(.*])), |
| [$ac_have_decl], |
| [Define to 1 if you have the declaration of `$1', |
| and to 0 if you don't.])]dnl |
| [m4_ifvaln([$2$3], [AS_IF([test $ac_have_decl = 1], [$2], [$3])])]) |
| |
| ]) |
| |
| dnl If flex/lex are not found, the top level configure sets LEX to |
| dnl "/path_to/missing flex". When AC_PROG_LEX tries to find the flex |
| dnl output file, it calls $LEX to do so, but the current lightweight |
| dnl "missing" won't create a file. This results in an error. |
| dnl Avoid calling the bulk of AC_PROG_LEX when $LEX is "missing". |
| AC_DEFUN_ONCE([AC_PROG_LEX], |
| [AC_CHECK_PROGS(LEX, flex lex, :) |
| case "$LEX" in |
| :|*"missing "*) ;; |
| *) _AC_PROG_LEX_YYTEXT_DECL ;; |
| esac]) |
| |
| ]) |