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Diffstat (limited to 'am/ax_compile_check_rettype.m4')
| -rw-r--r-- | am/ax_compile_check_rettype.m4 | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/am/ax_compile_check_rettype.m4 b/am/ax_compile_check_rettype.m4 new file mode 100644 index 0000000..0e22b69 --- /dev/null +++ b/am/ax_compile_check_rettype.m4 @@ -0,0 +1,86 @@ +# SYNOPSIS +# +# AC_COMPILE_RETTYPE(FUNC, ARGS [, HEADERS [, EXTRA_TYPES...]]) +# +# DESCRIPTION +# +# This macro finds the integer type that can be used to represent the +# value returned by FUNC (a C function or define). It uses only +# compile checks (AC_COMPILE_IFELSE) and is safe to use when cross- +# compiling. The ARGS parameter gives arguments to supply to the +# function call. Obviously, these must be immediate values. +# HEADERS supplies additional headers to include. +# +# If a matching integer type was found, the macro defines +# RETTYPE_`TYPE' to its name. Otherwise, an error is reported. +# +# EXAMPLE +# +# AC_COMPILE_RETTYPE(major, 0) +# +# REFERENCES +# +# The macro is derived from AX_COMPILE_CHECK_SIZEOF: +# https://www.gnu.org/software/autoconf-archive/ax_compile_check_sizeof.html +# +# LICENSE +# +# Copyright (c) 2008 Kaveh Ghazi <ghazi@caip.rutgers.edu> +# Copyright (c) 2017 Reini Urban <rurban@cpan.org> +# Copyright (c) 2019 Sergey Poznyakoff <gray@gnu.org> +# +# This program 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 3 of the License, or (at your +# option) any later version. +# +# This program 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 this program. If not, see <https://www.gnu.org/licenses/>. +# +# As a special exception, the respective Autoconf Macro's copyright owner +# gives unlimited permission to copy, distribute and modify the configure +# scripts that are the output of Autoconf when processing the Macro. You +# need not follow the terms of the GNU General Public License when using +# or distributing such scripts, even though portions of the text of the +# Macro appear in them. The GNU General Public License (GPL) does govern +# all other use of the material that constitutes the Autoconf Macro. +# +# This special exception to the GPL applies to versions of the Autoconf +# Macro released by the Autoconf Archive. When you make and distribute a +# modified version of the Autoconf Macro, you may extend this special +# exception to the GPL to apply to your modified version as well. + +#serial 1 + +AU_ALIAS([AC_COMPILE_CHECK_RETTYPE], [AX_COMPILE_CHECK_RETTYPE]) +AC_DEFUN([AX_COMPILE_CHECK_RETTYPE], +[changequote(<<, >>)dnl +dnl The name to #define. +define(<<AC_TYPE_NAME>>, translit(RETTYPE_$1, [a-z *], [A-Z_P]))dnl +dnl The cache variable name. +define(<<AC_CV_NAME>>, translit(ac_cv_rettype_$1, [ *], [_p]))dnl +changequote([, ])dnl +AC_MSG_CHECKING(return type of $1()) +AC_CACHE_VAL(AC_CV_NAME, +[for ac_type in char short int long "long long" $4 + do + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ +#include <sys/types.h> +$3 +]], [[switch (0) case 0: case (sizeof ($1($2)) == sizeof ($ac_type)):;]])], [AC_CV_NAME=$ac_type]) + if test x$AC_CV_NAME != x ; then break; fi +done +]) +if test x$AC_CV_NAME = x ; then + AC_MSG_ERROR([cannot determine type]) +fi +AC_MSG_RESULT($AC_CV_NAME) +AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [Data type returned by $1()]) +undefine([AC_TYPE_NAME])dnl +undefine([AC_CV_NAME])dnl +]) |