/usr/share/aclocal/mm-dietlib.m4 is in mm-common 0.9.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## This file is part of mm-common.
##
## mm-common is free software: you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published
## by the Free Software Foundation, either version 2 of the License,
## or (at your option) any later version.
##
## mm-common is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with mm-common. If not, see <http://www.gnu.org/licenses/>.
#serial 20091224
## _MM_PROG_GCC_VISIBILITY_CHECK
##
## Implementation helper macro of MM_PROG_GCC_VISIBILITY(). Pulled
## in through AC_REQUIRE() so that it will only be expanded once.
##
m4_define([_MM_PROG_GCC_VISIBILITY_CHECK],
[dnl
AC_PROVIDE([$0])[]dnl
AC_CACHE_CHECK([for GCC symbol visibility options],
[mm_cv_gcc_visibility_cxxflags],
[dnl
mm_save_CXXFLAGS=$CXXFLAGS
CXXFLAGS="$CXXFLAGS -fvisibility=hidden -fvisibility-inlines-hidden"
dnl
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#pragma GCC visibility push(default)
namespace Mm { void __attribute__((__visibility__("hidden"))) mmfunc(); }
void Mm::mmfunc() {}
#pragma GCC visibility pop
]], [[Mm::mmfunc();]])],
[mm_cv_gcc_visibility_cxxflags='-fvisibility=hidden -fvisibility-inlines-hidden'],
[mm_cv_gcc_visibility_cxxflags=none])
dnl
CXXFLAGS=$mm_save_CXXFLAGS])[]dnl
])
## MM_PROG_GCC_VISIBILITY(variable-name)
##
## Check whether the compiler supports the GNU C++ symbol visibility
## attributes and command-line options. If explicit symbol visibility is
## supported, the compiler command-line options for hiding all symbols by
## default are made available through the specified substitution variable
## <variable-name>.
##
## See also <http://gcc.gnu.org/wiki/Visibility> for more information on
## symbol visibility and the attributes supported by GCC.
##
AC_DEFUN([MM_PROG_GCC_VISIBILITY],
[dnl
m4_assert([$# >= 1])[]dnl
AC_LANG_ASSERT([C++])[]dnl
AC_REQUIRE([_MM_PRE_INIT])[]dnl
AC_REQUIRE([_MM_PROG_GCC_VISIBILITY_CHECK])[]dnl
AS_IF([test "x$mm_cv_gcc_visibility_cxxflags" != xnone],
[$1=$mm_cv_gcc_visibility_cxxflags], [$1=])
AC_SUBST([$1])[]dnl
])
## _MM_ARG_DISABLE_DEPRECATED_API_OPTION
##
## Implementation helper macro of MM_ARG_DISABLE_DEPRECATED_API(). Pulled
## in through AC_REQUIRE() so that it will only be expanded once.
##
m4_define([_MM_ARG_DISABLE_DEPRECATED_API_OPTION],
[dnl
AC_PROVIDE([$0])[]dnl
AC_ARG_ENABLE([deprecated-api],
[AS_HELP_STRING([--disable-deprecated-api],
[omit deprecated API from the library])],
[mm_enable_deprecated_api=$enableval],
[mm_enable_deprecated_api=yes])[]dnl
AS_IF([test "x$mm_enable_deprecated_api" = xno],
[AC_MSG_WARN([[Deprecated API will not be built, breaking compatibility.
Do not use this option for distribution packages.]])],
[AC_MSG_NOTICE([[Deprecated API will be built, for backwards-compatibility.]])])
AM_CONDITIONAL([DISABLE_DEPRECATED_API], [test "x$mm_enable_deprecated_api" = xno])[]dnl
])
## _MM_ARG_DISABLE_DEPRECATED_API_DEFINE(define-prefix [define-prefix ...])
##
## Implementation helper macro of MM_ARG_DISABLE_DEPRECATED_API(). Expands
## to a list of AC_DEFINE() calls, one for each prefix in the argument list.
##
m4_define([_MM_ARG_DISABLE_DEPRECATED_API_DEFINE],
[m4_foreach_w([mm_prefix], [$1],
[AC_DEFINE(m4_defn([mm_prefix])[_DISABLE_DEPRECATED], [1],
[Define to omit deprecated API from the library.])
])])
## MM_ARG_DISABLE_DEPRECATED_API([define-prefix [define-prefix ...]])
##
## Provide the --disable-deprecated-api configure option, which may be used
## to trim the size of the resulting library at the cost of breaking binary
## compatibility. By default, deprecated API will be built.
##
## Each <define-prefix> in the whitespace-separated argument list is expanded
## to a C preprocessor macro name <define-prefix>_DISABLE_DEPRECATED, which
## will be defined to 1 in the generated configuration header if the option
## to disable deprecated API is used. The DISABLE_DEPRECATED_API Automake
## conditional is provided as well.
##
AC_DEFUN([MM_ARG_DISABLE_DEPRECATED_API],
[dnl
AC_REQUIRE([_MM_PRE_INIT])[]dnl
AC_REQUIRE([_MM_ARG_DISABLE_DEPRECATED_API_OPTION])[]dnl
AS_IF([test "x$mm_enable_deprecated_api" = xno],
[_MM_ARG_DISABLE_DEPRECATED_API_DEFINE(
m4_ifval([$1], [[$1]], [AS_TR_CPP(m4_defn([AC_PACKAGE_TARNAME]))]))])[]dnl
])
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