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* doc/autoconf.texi (C Compiler): Document AC_C_TYPEOF. * lib/autoconf/c.m4 (AC_C_TYPEOF): New macro. * tests/c.at (C keywords): Test AC_C_TYPEOF.
212 lines
4.8 KiB
Plaintext
212 lines
4.8 KiB
Plaintext
# -*- Autotest -*-
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AT_BANNER([C low level compiling/preprocessing macros.])
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# Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Free Software
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# Foundation, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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# Since the macros which compile are required by most tests, check
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# them first. But remember that looking for a compiler is even more
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# primitive, so check those first.
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## ------------ ##
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## Extensions. ##
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## ------------ ##
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# As far as we know only `foo', `foo.exe' are possible executable,
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# and `foo.o', `foo.obj' are possible object files. Autoconf must not
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# know that, but it is OK for the test suite to take this into account.
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AT_CHECK_MACRO([Extensions],
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[[AC_PROG_CC
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case $ac_exeext in
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'' | '.exe' ) ;;
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* ) AC_MSG_ERROR([suspicious executable suffix: $ac_exeext]);;
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esac
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case $ac_objext in
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'o' | 'obj' ) ;;
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* ) AC_MSG_ERROR([suspicious object suffix: $ac_objext]);;
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esac
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]])
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## -------------------------- ##
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## Broken/missing compilers. ##
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## -------------------------- ##
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# Check that Autoconf correctly diagnoses broken compilers, and in
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# particular, if it does not exit 77, the test suite is in trouble...
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# FIXME: Once a precise message decided, check stderr of configure.
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AT_SETUP([Broken/missing compilers])
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AT_DATA([configure.ac],
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[[AC_INIT
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CC=no-such-compiler
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AC_PROG_CC
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]])
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AT_CHECK_AUTOCONF
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AT_CHECK_CONFIGURE([], 77, ignore, ignore)
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AT_CLEANUP
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## ------------ ##
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## C keywords. ##
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## ------------ ##
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# GCC supports `const', `typeof', and `volatile'.
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AT_CHECK_MACRO([C keywords],
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[[AC_PROG_CC
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AC_C_CONST
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AC_C_TYPEOF
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AC_C_VOLATILE
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case $GCC,$ac_cv_c_const,$ac_cv_c_typeof,$ac_cv_c_volatile in
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yes,*no*)
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AC_MSG_ERROR([failed to detect `const', `typeof', or `volatile' support]);;
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esac
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]])
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## --------------------------------- ##
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## AC_PROG_CPP requires AC_PROG_CC. ##
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## --------------------------------- ##
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# Must invoke AC_PROG_CC.
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AT_CHECK_MACRO([AC_PROG_CPP requires AC_PROG_CC],
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[[AC_PROG_CPP
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test -z "$CC" &&
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AC_MSG_ERROR([looked for a C preprocessor without looking for a compiler])
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]])
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## --------------------------- ##
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## AC_PROG_CPP with warnings. ##
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## --------------------------- ##
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# It's Ok for strict preprocessors to produce warnings.
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AT_SETUP([AC_PROG_CPP with warnings])
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AT_DATA([mycpp],
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[[#! /bin/sh
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echo noise >&2
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exec "$@"
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]])
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chmod +x mycpp
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_AT_CHECK_AC_MACRO(
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[[AC_PROG_CPP
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# If the preprocessor is not strict, just ignore
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test "x$ac_c_preproc_warn_flag" = xyes &&
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AC_MSG_ERROR([preprocessor has no warning option], 77)
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CPP="./mycpp $CPP"
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AC_CHECK_HEADERS(stdio.h autoconf_io.h)]])
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AT_CHECK_DEFINES(
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[/* #undef HAVE_AUTOCONF_IO_H */
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#define HAVE_STDIO_H 1
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])
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AT_CLEANUP
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## ------------------------------ ##
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## AC_PROG_CPP without warnings. ##
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## ------------------------------ ##
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AT_SETUP([AC_PROG_CPP without warnings])
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# Ignore if /lib/cpp doesn't work
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AT_CHECK([/lib/cpp </dev/null || exit 77], [], [ignore], [ignore])
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# A cpp which exit status is meaningless.
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AT_DATA([mycpp],
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[[#! /bin/sh
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/lib/cpp "$@"
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exit 0
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]])
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chmod +x mycpp
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_AT_CHECK_AC_MACRO(
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[[CPP=./mycpp
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AC_PROG_CPP
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test "x$ac_c_preproc_warn_flag" != xyes &&
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AC_MSG_ERROR([failed to detect preprocessor warning option])
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AC_CHECK_HEADERS(stdio.h autoconf_io.h)]])
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AT_CHECK_DEFINES(
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[/* #undef HAVE_AUTOCONF_IO_H */
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#define HAVE_STDIO_H 1
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])
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AT_CLEANUP
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## -------------------- ##
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## AC_PROG_CPP via CC. ##
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## -------------------- ##
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# It's Ok for strict preprocessors to produce warnings.
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AT_SETUP([AC_PROG_CPP via CC])
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# Ignore if /lib/cpp doesn't work
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AT_CHECK([/lib/cpp </dev/null || exit 77], [], [ignore], [ignore])
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AT_DATA([mycc],
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[[#! /bin/sh
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echo "Annoying copyright message" >&2
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exec "$@"
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]])
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chmod +x mycc
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# We go through the following contortions, in order to have the
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# configure script go down the same codepaths as it would during a
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# normal CPP selection check. If we explicitly set CPP, it goes down
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# a different codepath.
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_AT_CHECK_AC_MACRO(
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[[AC_PROG_CC
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CC="./mycc $CC"
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AC_PROG_CPP
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# The test $CC compiler should have been selected.
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test "$CPP" != "$CC -E" &&
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AC_MSG_ERROR([error messages on stderr cause the preprocessor selection to fail])
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# Exercise CPP.
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AC_CHECK_HEADERS(stdio.h autoconf_io.h)]])
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AT_CHECK_DEFINES(
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[/* #undef HAVE_AUTOCONF_IO_H */
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#define HAVE_STDIO_H 1
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])
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AT_CLEANUP
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