mirror of
https://gitlab.xiph.org/xiph/ezstream.git
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114 lines
2.9 KiB
Plaintext
114 lines
2.9 KiB
Plaintext
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dnl # $Id$
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dnl # Check if the compiler understands a certain __attribute__.
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dnl # Copyright (c) 2008 Moritz Grimm <mgrimm@mrsserver.net>
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dnl #
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dnl # Permission to use, copy, modify, and distribute this software for any
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dnl # purpose with or without fee is hereby granted, provided that the above
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dnl # copyright notice and this permission notice appear in all copies.
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dnl #
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dnl # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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dnl # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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dnl # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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dnl # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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dnl # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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dnl # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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dnl # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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dnl # AX_FUNC_ATTRIBUTE([FUNC-SIGNATURE], [ATTRIBUTE], [ARGS],
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dnl # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
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dnl # AX_FUNC_ATTRIBUTE_UNUSED([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
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AC_DEFUN([AX_FUNC_ATTRIBUTE],
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[
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AC_REQUIRE([AX_CHECK_ERROR_FLAG])
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if test x"${local_cv_prog_cc_error_flag}" != "xno"; then
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_errflag="${local_cv_prog_cc_error_flag}"
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else
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_errflag=""
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fi
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AC_MSG_CHECKING([if __attribute__((__$2__$3)) is supported])
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_cv_sufx_=$(echo "$3" | sed 'y|-+,=() |_p_____|')
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AC_CACHE_VAL([local_cv_prog_cc_attr_$2_${_cv_sufx}],
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[
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AC_LANG_PUSH([C])
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save_CFLAGS="${CFLAGS}"
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CFLAGS="${CFLAGS} ${_errflag}"
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <stdlib.h>
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void * attrtest($1)
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__attribute__((__$2__$3));
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void *
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attrtest($1) { return(NULL); }
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]],
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[[]])],
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[eval "local_cv_prog_cc_attr_$2_${_cv_sufx_}=yes"],
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[eval "local_cv_prog_cc_attr_$2_${_cv_sufx_}=no"])
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CFLAGS="${save_CFLAGS}"
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AC_LANG_POP([C])
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])
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eval "_cache_val_=\${local_cv_prog_cc_attr_$2_${_cv_sufx_}}"
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if test x"${_cache_val_}" = "xyes"; then
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AC_MSG_RESULT([yes])
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:
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$4
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else
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AC_MSG_RESULT([no])
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:
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$5
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fi
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])
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AC_DEFUN([AX_FUNC_ATTRIBUTE_UNUSED],
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[
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AC_REQUIRE([AX_CHECK_ERROR_FLAG])
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if test x"${local_cv_prog_cc_error_flag}" != "xno"; then
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_errflag="${local_cv_prog_cc_error_flag}"
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else
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_errflag=""
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fi
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AC_MSG_CHECKING([if __attribute__((unused)) is supported])
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AC_CACHE_VAL([local_cv_proc_cc_attr_unused],
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[
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AC_LANG_PUSH([C])
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save_CFLAGS="${CFLAGS}"
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CFLAGS="${CFLAGS} ${_errflag}"
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[
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void attrtest(void)
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__attribute__((unused));
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void
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attrtest(void) {}
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]],
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[[
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int attrtest_var
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__attribute__((unused));
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]])],
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[local_cv_proc_cc_attr_unused=yes],
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[local_cv_proc_cc_attr_unused=no])
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CFLAGS="${save_CFLAGS}"
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AC_LANG_POP([C])
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])
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if test x"${local_cv_proc_cc_attr_unused}" = "xyes"; then
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AC_MSG_RESULT([yes])
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:
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$1
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else
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AC_MSG_RESULT([no])
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:
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$2
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fi
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])
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