626a5a0cb2
config/: * override.m4: Error out if a buggy M4 was detected, to avoid spurious diffs in generated files.
104 lines
3.6 KiB
Text
104 lines
3.6 KiB
Text
dnl Fix Autoconf bugs by overriding broken internal Autoconf
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dnl macros with backports of fixes from newer releases.
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dnl
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dnl The override bits of this file should be a no-op for the newest
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dnl Autoconf version, which means they can be removed once the complete
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dnl tree has moved to a new enough Autoconf version.
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dnl
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dnl The _GCC_AUTOCONF_VERSION_TEST ensures that exactly the desired
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dnl Autoconf version is used. It should be kept for consistency.
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dnl Use ifdef/ifelse over m4_ifdef/m4_ifelse to be clean for 2.13.
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ifdef([m4_PACKAGE_VERSION], [
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dnl Provide m4_copy_force and m4_rename_force for old Autoconf versions.
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m4_ifndef([m4_copy_force],
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[m4_define([m4_copy_force],
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[m4_ifdef([$2], [m4_undefine([$2])])m4_copy($@)])])
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m4_ifndef([m4_rename_force],
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[m4_define([m4_rename_force],
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[m4_ifdef([$2], [m4_undefine([$2])])m4_rename($@)])])
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dnl AC_DEFUN a commonly used macro so this file is picked up.
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m4_copy([AC_PREREQ], [_AC_PREREQ])
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AC_DEFUN([AC_PREREQ], [frob])
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m4_copy_force([_AC_PREREQ], [AC_PREREQ])
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dnl Ensure exactly this Autoconf version is used
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m4_ifndef([_GCC_AUTOCONF_VERSION],
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[m4_define([_GCC_AUTOCONF_VERSION], [2.64])])
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dnl Test for the exact version when AC_INIT is expanded.
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dnl This allows to update the tree in steps (for testing)
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dnl by putting
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dnl m4_define([_GCC_AUTOCONF_VERSION], [X.Y])
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dnl in configure.ac before AC_INIT,
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dnl without rewriting this file.
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dnl Or for updating the whole tree at once with the definition above.
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AC_DEFUN([_GCC_AUTOCONF_VERSION_CHECK],
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[m4_if(m4_defn([_GCC_AUTOCONF_VERSION]),
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m4_defn([m4_PACKAGE_VERSION]), [],
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[m4_fatal([Please use exactly Autoconf ]_GCC_AUTOCONF_VERSION[ instead of ]m4_defn([m4_PACKAGE_VERSION])[.])])
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])
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m4_define([AC_INIT], m4_defn([AC_INIT])[
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_GCC_AUTOCONF_VERSION_CHECK
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])
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dnl Ensure we do not use a buggy M4.
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m4_if(m4_index([..wi.d.], [.d.]), [-1],
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[m4_fatal(m4_do([m4 with buggy strstr detected. Please install
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GNU M4 1.4.16 or newer and set the M4 environment variable]))])
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dnl Fix 2.64 cross compile detection for AVR and RTEMS
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dnl by not trying to compile fopen.
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m4_if(m4_defn([m4_PACKAGE_VERSION]), [2.64],
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[m4_foreach([_GCC_LANG], [C, C++, Fortran, Fortran 77],
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[m4_define([_AC_LANG_IO_PROGRAM(]_GCC_LANG[)], m4_defn([AC_LANG_PROGRAM(]_GCC_LANG[)]))])])
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m4_version_prereq([2.66],, [
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dnl We need AC_CHECK_DECL which works for overloaded C++ functions.
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# _AC_CHECK_DECL_BODY
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# -------------------
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# Shell function body for AC_CHECK_DECL.
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m4_define([_AC_CHECK_DECL_BODY],
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[ AS_LINENO_PUSH([$[]1])
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[as_decl_name=`echo $][2|sed 's/ *(.*//'`]
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[as_decl_use=`echo $][2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`]
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AC_CACHE_CHECK([whether $as_decl_name is declared], [$[]3],
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$[]4],
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[@%:@ifndef $[]as_decl_name
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@%:@ifdef __cplusplus
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(void) $[]as_decl_use;
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@%:@else
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(void) $[]as_decl_name;
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@%:@endif
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@%:@endif
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])],
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[AS_VAR_SET([$[]3], [yes])],
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[AS_VAR_SET([$[]3], [no])])])
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AS_LINENO_POP
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])# _AC_CHECK_DECL_BODY
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# _AC_CHECK_DECLS(SYMBOL, ACTION-IF_FOUND, ACTION-IF-NOT-FOUND,
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# INCLUDES)
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# -------------------------------------------------------------
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# Helper to AC_CHECK_DECLS, which generates the check for a single
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# SYMBOL with INCLUDES, performs the AC_DEFINE, then expands
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# ACTION-IF-FOUND or ACTION-IF-NOT-FOUND.
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m4_define([_AC_CHECK_DECLS],
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[AC_CHECK_DECL([$1], [ac_have_decl=1], [ac_have_decl=0], [$4])]dnl
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[AC_DEFINE_UNQUOTED(AS_TR_CPP(m4_bpatsubst(HAVE_DECL_[$1],[ *(.*])),
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[$ac_have_decl],
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[Define to 1 if you have the declaration of `$1',
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and to 0 if you don't.])]dnl
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[m4_ifvaln([$2$3], [AS_IF([test $ac_have_decl = 1], [$2], [$3])])])
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])
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])
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