109 lines
1.9 KiB
Bash
Executable File
109 lines
1.9 KiB
Bash
Executable File
#!/bin/sh
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# SPDX-License-Identifier: BSD-3-Clause
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# Copyright 2014-2015 6WIND S.A.
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#
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# Crude script to detect whether particular types, macros and functions are
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# defined by trying to compile a file with a given header. Can be used to
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# perform cross-platform checks since the resulting object file is not
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# executed.
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#
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# Set VERBOSE=1 in the environment to display compiler output and errors.
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#
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# CC, CPPFLAGS, CFLAGS, EXTRA_CPPFLAGS and EXTRA_CFLAGS are taken from the
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# environment.
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#
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# AUTO_CONFIG_CFLAGS may append additional CFLAGS without modifying the
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# above variables.
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file=${1:?output file name required (config.h)}
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macro=${2:?output macro name required (HAVE_*)}
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include=${3:?include name required (foo.h)}
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type=${4:?object type required (define, enum, type, field, func)}
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name=${5:?define/type/function name required}
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: ${CC:=cc}
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temp=/tmp/${0##*/}.$$.c
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case $type in
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define)
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code="\
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#ifndef $name
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#error $name not defined
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#endif
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"
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;;
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enum)
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code="\
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long test____ = $name;
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"
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;;
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type)
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code="\
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$name test____;
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"
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;;
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field)
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code="\
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void test____(void)
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{
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${name%%.*} test_____;
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(void)test_____.${name#*.};
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}
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"
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;;
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func)
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code="\
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void (*test____)() = (void (*)())$name;
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"
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;;
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*)
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unset error
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: ${error:?unknown object type \"$type\"}
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exit
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esac
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if [ "${VERBOSE}" = 1 ]
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then
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err=2
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out=1
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eol='
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'
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else
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exec 3> /dev/null ||
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exit
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err=3
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out=3
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eol=' '
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fi &&
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printf 'Looking for %s %s in %s.%s' \
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"${name}" "${type}" "${include}" "${eol}" &&
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printf "\
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#include <%s>
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%s
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" "$include" "$code" > "${temp}" &&
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if ${CC} ${CPPFLAGS} ${EXTRA_CPPFLAGS} ${CFLAGS} ${EXTRA_CFLAGS} \
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${AUTO_CONFIG_CFLAGS} \
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-c -o ${temp}.o "${temp}" 1>&${out} 2>&${err}
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then
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rm -f "${temp}" "${temp}.o"
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printf "\
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#ifndef %s
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#define %s 1
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#endif /* %s */
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" "${macro}" "${macro}" "${macro}" >> "${file}" &&
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printf 'Defining %s.\n' "${macro}"
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else
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rm -f "${temp}" "${temp}.o"
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printf "\
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/* %s is not defined. */
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" "${macro}" >> "${file}" &&
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printf 'Not defining %s.\n' "${macro}"
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fi
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exit
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