-# This file is part of Autoconf. -*- Autoconf -*-
+# This file is part of Autoconf. -*- Autoconf -*-
# Programming languages support.
-# Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
+# Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 Free Software
+# Foundation, Inc.
#
# 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
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-# 02111-1307, USA.
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
#
# As a special exception, the Free Software Foundation gives unlimited
# permission to copy, distribute and modify the configure scripts that
# to the GPL from your modified version.
#
# Written by David MacKenzie, with help from
+# Akim Demaille, Paul Eggert,
# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
# Roland McGrath, Noah Friedman, david d zuhn, and many others.
# ------------
# CXXFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
m4_define([AC_LANG(C++)],
-[ac_ext=cc
+[ac_ext=cpp
ac_cpp='$CXXCPP $CPPFLAGS'
ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&AS_MESSAGE_LOG_FD'
ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&AS_MESSAGE_LOG_FD'
+# ------------------------------ #
+# 1d. The Objective C language. #
+# ------------------------------ #
+
+
+# AC_LANG(Objective C)
+# --------------------
+m4_define([AC_LANG(Objective C)],
+[ac_ext=m
+ac_cpp='$OBJCPP $CPPFLAGS'
+ac_compile='$OBJC -c $OBJCFLAGS $CPPFLAGS conftest.$ac_ext >&AS_MESSAGE_LOG_FD'
+ac_link='$OBJC -o conftest$ac_exeext $OBJCFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&AS_MESSAGE_LOG_FD'
+ac_compiler_gnu=$ac_cv_objc_compiler_gnu
+])
+
+
+# AC_LANG_OBJC
+# ------------
+AU_DEFUN([AC_LANG_OBJC], [AC_LANG(Objective C)])
+
+
+# _AC_LANG_ABBREV(Objective C)
+# ----------------------------
+m4_define([_AC_LANG_ABBREV(Objective C)], [objc])
+
+
+# _AC_LANG_PREFIX(Objective C)
+# ----------------------------
+m4_define([_AC_LANG_PREFIX(Objective C)], [OBJC])
+
+
+
## ---------------------- ##
## 2.Producing programs. ##
## ---------------------- ##
# AC_LANG_SOURCE(C)(BODY)
# -----------------------
-# This sometimes fails to find confdefs.h, for some reason.
# We can't use '#line $LINENO "configure"' here, since
# Sun c89 (Sun WorkShop 6 update 2 C 5.3 Patch 111679-08 2002/05/09)
# rejects $LINENO greater than 32767, and some configure scripts
m4_define([AC_LANG_CALL(C)],
[AC_LANG_PROGRAM([$1
m4_if([$2], [main], ,
-[/* Override any gcc2 internal prototype to avoid an error. */
+[/* Override any GCC internal prototype to avoid an error.
+ Use char because int might match the return type of a GCC
+ builtin and then its argument prototype would still apply. */
#ifdef __cplusplus
extern "C"
#endif
-/* We use char because int might match the return type of a gcc2
- builtin and then its argument prototype would still apply. */
-char $2 ();])], [$2 ();])])
+char $2 ();])], [return $2 ();])])
# AC_LANG_FUNC_LINK_TRY(C)(FUNCTION)
#undef $1
-/* Override any gcc2 internal prototype to avoid an error. */
+/* Override any GCC internal prototype to avoid an error.
+ Use char because int might match the return type of a GCC
+ builtin and then its argument prototype would still apply. */
#ifdef __cplusplus
extern "C"
-{
#endif
-/* We use char because int might match the return type of a gcc2
- builtin and then its argument prototype would still apply. */
char $1 ();
/* The GNU C library defines this for functions which it implements
to always fail with ENOSYS. Some functions are actually named
something starting with __ and the normal name is an alias. */
-#if defined (__stub_$1) || defined (__stub___$1)
+#if defined __stub_$1 || defined __stub___$1
choke me
-#else
-char (*f) () = $1;
#endif
-#ifdef __cplusplus
-}
-#endif
-], [return f != $1;])])
+], [return $1 ();])])
# AC_LANG_BOOL_COMPILE_TRY(C)(PROLOGUE, EXPRESSION)
# -------------------------------------------------
+# Return a program that is valid if EXPRESSION is nonzero.
+# EXPRESSION must be an integer constant expression.
# Be sure to use this array to avoid `unused' warnings, which are even
# errors with `-W error'.
m4_define([AC_LANG_BOOL_COMPILE_TRY(C)],
# But we include them only after the EXPRESSION has been evaluated.
m4_define([AC_LANG_INT_SAVE(C)],
[AC_LANG_PROGRAM([$1
-long longval () { return $2; }
-unsigned long ulongval () { return $2; }
+static long int longval () { return $2; }
+static unsigned long int ulongval () { return $2; }
@%:@include <stdio.h>
@%:@include <stdlib.h>],
[
FILE *f = fopen ("conftest.val", "w");
if (! f)
- exit (1);
+ return 1;
if (($2) < 0)
{
- long i = longval ();
+ long int i = longval ();
if (i != ($2))
- exit (1);
+ return 1;
fprintf (f, "%ld\n", i);
}
else
{
- unsigned long i = ulongval ();
+ unsigned long int i = ulongval ();
if (i != ($2))
- exit (1);
+ return 1;
fprintf (f, "%lu\n", i);
}
- exit (ferror (f) || fclose (f) != 0);
+ return ferror (f) || fclose (f) != 0;
])])
+# ------------------------- #
+# 2d. Objective C sources. #
+# ------------------------- #
+
+# AC_LANG_SOURCE(Objective C)(BODY)
+# ---------------------------------
+m4_copy([AC_LANG_SOURCE(C)], [AC_LANG_SOURCE(Objective C)])
+
+
+# AC_LANG_PROGRAM(Objective C)([PROLOGUE], [BODY])
+# ------------------------------------------------
+m4_copy([AC_LANG_PROGRAM(C)], [AC_LANG_PROGRAM(Objective C)])
+
+
+# AC_LANG_CALL(Objective C)(PROLOGUE, FUNCTION)
+# ---------------------------------------------
+m4_copy([AC_LANG_CALL(C)], [AC_LANG_CALL(Objective C)])
+
+
+# AC_LANG_FUNC_LINK_TRY(Objective C)(FUNCTION)
+# --------------------------------------------
+m4_copy([AC_LANG_FUNC_LINK_TRY(C)], [AC_LANG_FUNC_LINK_TRY(Objective C)])
+
+
+# AC_LANG_BOOL_COMPILE_TRY(Objective C)(PROLOGUE, EXPRESSION)
+# -----------------------------------------------------------
+m4_copy([AC_LANG_BOOL_COMPILE_TRY(C)], [AC_LANG_BOOL_COMPILE_TRY(Objective C)])
+
+
+# AC_LANG_INT_SAVE(Objective C)(PROLOGUE, EXPRESSION)
+# ---------------------------------------------------
+m4_copy([AC_LANG_INT_SAVE(C)], [AC_LANG_INT_SAVE(Objective C)])
+
+
+
## -------------------------------------------- ##
## 3. Looking for Compilers and Preprocessors. ##
## -------------------------------------------- ##
# _AC_ARG_VAR_CPPFLAGS
# --------------------
# Document and register CPPFLAGS, which is used by
-# AC_PROG_{CC, CPP, CXX, CXXCPP}.
+# AC_PROG_{CC, CPP, CXX, CXXCPP, OBJC, OBJCPP}.
AC_DEFUN([_AC_ARG_VAR_CPPFLAGS],
[AC_ARG_VAR([CPPFLAGS],
- [C/C++ preprocessor flags, e.g. -I<include dir> if you have
- headers in a nonstandard directory <include dir>])])
+ [C/C++/Objective C preprocessor flags, e.g. -I<include dir>
+ if you have headers in a nonstandard directory <include dir>])])
# _AC_ARG_VAR_LDFLAGS
# -------------------
# Document and register LDFLAGS, which is used by
-# AC_PROG_{CC, CXX, F77}.
+# AC_PROG_{CC, CXX, F77, FC, OBJC}.
AC_DEFUN([_AC_ARG_VAR_LDFLAGS],
[AC_ARG_VAR([LDFLAGS],
[linker flags, e.g. -L<lib dir> if you have libraries in a
nonstandard directory <lib dir>])])
+# _AC_ARG_VAR_LIBS
+# ----------------
+# Document and register LIBS, which is used by
+# AC_PROG_{CC, CXX, F77, FC, OBJS}.
+AC_DEFUN([_AC_ARG_VAR_LIBS],
+[AC_ARG_VAR([LIBS],
+ [libraries to pass to the linker, e.g. -l<library>])])
+
# AC_LANG_PREPROC(C)
# -------------------
# -----------------------------------------------
# Check if $ac_cpp is a working preprocessor that can flag absent
# includes either by the exit status or by warnings.
-# Set ac_cpp_err to a non-empty value if the preprocessor failed.
# This macro is for all languages, not only C.
AC_DEFUN([_AC_PROG_PREPROC_WORKS_IFELSE],
[ac_preproc_ok=false
[# Broken: fails on valid input.
continue])
- # OK, works on sane cases. Now check whether non-existent headers
+ # OK, works on sane cases. Now check whether nonexistent headers
# can be detected and how.
_AC_PREPROC_IFELSE([AC_LANG_SOURCE([[@%:@include <ac_nonexistent.h>]])],
[# Broken: success on invalid input.
AC_ARG_VAR([CC], [C compiler command])dnl
AC_ARG_VAR([CFLAGS], [C compiler flags])dnl
_AC_ARG_VAR_LDFLAGS()dnl
+_AC_ARG_VAR_LIBS()dnl
_AC_ARG_VAR_CPPFLAGS()dnl
m4_ifval([$1],
[AC_CHECK_TOOLS(CC, [$1])],
[AC_CHECK_TOOL(CC, gcc)
if test -z "$CC"; then
- AC_CHECK_TOOL(CC, cc)
+ dnl Here we want:
+ dnl AC_CHECK_TOOL(CC, cc)
+ dnl but without the check for a tool without the prefix.
+ dnl Until the check is removed from there, copy the code:
+ if test -n "$ac_tool_prefix"; then
+ AC_CHECK_PROG(CC, [${ac_tool_prefix}cc], [${ac_tool_prefix}cc])
+ fi
fi
if test -z "$CC"; then
AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc)
fi
if test -z "$CC"; then
- AC_CHECK_TOOLS(CC, cl)
+ AC_CHECK_TOOLS(CC, cl.exe)
fi
])
test -z "$CC" && AC_MSG_FAILURE([no acceptable C compiler found in \$PATH])
# Provide some information about the compiler.
-echo "$as_me:$LINENO:" \
- "checking for _AC_LANG compiler version" >&AS_MESSAGE_LOG_FD
+_AS_ECHO_LOG([checking for _AC_LANG compiler version])
ac_compiler=`set X $ac_compile; echo $[2]`
-_AC_EVAL([$ac_compiler --version </dev/null >&AS_MESSAGE_LOG_FD])
-_AC_EVAL([$ac_compiler -v </dev/null >&AS_MESSAGE_LOG_FD])
-_AC_EVAL([$ac_compiler -V </dev/null >&AS_MESSAGE_LOG_FD])
+_AC_DO([$ac_compiler --version >&AS_MESSAGE_LOG_FD])
+_AC_DO([$ac_compiler -v >&AS_MESSAGE_LOG_FD])
+_AC_DO([$ac_compiler -V >&AS_MESSAGE_LOG_FD])
m4_expand_once([_AC_COMPILER_EXEEXT])[]dnl
m4_expand_once([_AC_COMPILER_OBJEXT])[]dnl
_AC_LANG_COMPILER_GNU
GCC=`test $ac_compiler_gnu = yes && echo yes`
_AC_PROG_CC_G
-_AC_PROG_CC_STDC
-# Some people use a C++ compiler to compile C. Since we use `exit',
-# in C++ we need to declare it. In case someone uses the same compiler
-# for both compiling C and C++ we need to have the C++ compiler decide
-# the declaration of exit, since it's the most demanding environment.
-_AC_COMPILE_IFELSE([@%:@ifndef __cplusplus
- choke me
-@%:@endif],
- [_AC_PROG_CXX_EXIT_DECLARATION])
+_AC_PROG_CC_C89
AC_LANG_POP(C)dnl
])# AC_PROG_CC
# Check whether -g works, even if CFLAGS is set, in case the package
# plays around with CFLAGS (such as to build both debugging and normal
# versions of a library), tasteless as that idea is.
+# Don't consider -g to work if it generates warnings when plain compiles don't.
m4_define([_AC_PROG_CC_G],
[ac_test_CFLAGS=${CFLAGS+set}
ac_save_CFLAGS=$CFLAGS
-CFLAGS="$CFLAGS -g"
AC_CACHE_CHECK(whether $CC accepts -g, ac_cv_prog_cc_g,
- [_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [ac_cv_prog_cc_g=yes],
- [ac_cv_prog_cc_g=no])])
+ [ac_save_c_werror_flag=$ac_c_werror_flag
+ ac_c_werror_flag=yes
+ ac_cv_prog_cc_g=no
+ CFLAGS="-g"
+ _AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+ [ac_cv_prog_cc_g=yes],
+ [CFLAGS=""
+ _AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+ [],
+ [ac_c_werror_flag=$ac_save_c_werror_flag
+ CFLAGS="-g"
+ _AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+ [ac_cv_prog_cc_g=yes])])])
+ ac_c_werror_flag=$ac_save_c_werror_flag])
if test "$ac_test_CFLAGS" = set; then
CFLAGS=$ac_save_CFLAGS
elif test $ac_cv_prog_cc_g = yes; then
# -----------------------
AN_FUNCTION([ioctl], [AC_PROG_GCC_TRADITIONAL])
AC_DEFUN([AC_PROG_GCC_TRADITIONAL],
-[if test $ac_cv_c_compiler_gnu = yes; then
+[AC_REQUIRE([AC_PROG_CC])dnl
+if test $ac_cv_c_compiler_gnu = yes; then
AC_CACHE_CHECK(whether $CC needs -traditional,
ac_cv_prog_gcc_traditional,
[ ac_pattern="Autoconf.*'x'"
# Make sure it works both with $CC and with simple cc.
# We do the test twice because some compilers refuse to overwrite an
# existing .o file with -o, though they will create one.
-ac_try='$CC -c conftest.$ac_ext -o conftest.$ac_objext >&AS_MESSAGE_LOG_FD'
-if AC_TRY_EVAL(ac_try) &&
- test -f conftest.$ac_objext && AC_TRY_EVAL(ac_try);
+ac_try='$CC -c conftest.$ac_ext -o conftest2.$ac_objext >&AS_MESSAGE_LOG_FD'
+rm -f conftest2.*
+if _AC_DO_VAR(ac_try) &&
+ test -f conftest2.$ac_objext && _AC_DO_VAR(ac_try);
then
eval ac_cv_prog_cc_${ac_cc}_c_o=yes
if test "x$CC" != xcc; then
# Test first that cc exists at all.
- if AC_TRY_COMMAND(cc -c conftest.$ac_ext >&AS_MESSAGE_LOG_FD); then
- ac_try='cc -c conftest.$ac_ext -o conftest.$ac_objext >&AS_MESSAGE_LOG_FD'
- if AC_TRY_EVAL(ac_try) &&
- test -f conftest.$ac_objext && AC_TRY_EVAL(ac_try);
+ if _AC_DO_TOKENS(cc -c conftest.$ac_ext >&AS_MESSAGE_LOG_FD); then
+ ac_try='cc -c conftest.$ac_ext -o conftest2.$ac_objext >&AS_MESSAGE_LOG_FD'
+ rm -f conftest2.*
+ if _AC_DO_VAR(ac_try) &&
+ test -f conftest2.$ac_objext && _AC_DO_VAR(ac_try);
then
# cc works too.
:
else
eval ac_cv_prog_cc_${ac_cc}_c_o=no
fi
-rm -f conftest*
+rm -f core conftest*
])dnl
-if eval "test \"`echo '$ac_cv_prog_cc_'${ac_cc}_c_o`\" = yes"; then
+if eval test \$ac_cv_prog_cc_${ac_cc}_c_o = yes; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
AC_ARG_VAR([CXX], [C++ compiler command])dnl
AC_ARG_VAR([CXXFLAGS], [C++ compiler flags])dnl
_AC_ARG_VAR_LDFLAGS()dnl
+_AC_ARG_VAR_LIBS()dnl
_AC_ARG_VAR_CPPFLAGS()dnl
-AC_CHECK_TOOLS(CXX,
- [$CCC m4_default([$1],
- [g++ c++ gpp aCC CC cxx cc++ cl FCC KCC RCC xlC_r xlC])],
- g++)
-
+_AC_ARG_VAR_PRECIOUS([CCC])dnl
+if test -z "$CXX"; then
+ if test -n "$CCC"; then
+ CXX=$CCC
+ else
+ AC_CHECK_TOOLS(CXX,
+ [m4_default([$1],
+ [g++ c++ gpp aCC CC cxx cc++ cl.exe FCC KCC RCC xlC_r xlC])],
+ g++)
+ fi
+fi
# Provide some information about the compiler.
-echo "$as_me:$LINENO:" \
- "checking for _AC_LANG compiler version" >&AS_MESSAGE_LOG_FD
+_AS_ECHO_LOG([checking for _AC_LANG compiler version])
ac_compiler=`set X $ac_compile; echo $[2]`
-_AC_EVAL([$ac_compiler --version </dev/null >&AS_MESSAGE_LOG_FD])
-_AC_EVAL([$ac_compiler -v </dev/null >&AS_MESSAGE_LOG_FD])
-_AC_EVAL([$ac_compiler -V </dev/null >&AS_MESSAGE_LOG_FD])
+_AC_DO([$ac_compiler --version >&AS_MESSAGE_LOG_FD])
+_AC_DO([$ac_compiler -v >&AS_MESSAGE_LOG_FD])
+_AC_DO([$ac_compiler -V >&AS_MESSAGE_LOG_FD])
m4_expand_once([_AC_COMPILER_EXEEXT])[]dnl
m4_expand_once([_AC_COMPILER_OBJEXT])[]dnl
_AC_LANG_COMPILER_GNU
GXX=`test $ac_compiler_gnu = yes && echo yes`
_AC_PROG_CXX_G
-_AC_PROG_CXX_EXIT_DECLARATION
AC_LANG_POP(C++)dnl
])# AC_PROG_CXX
# Check whether -g works, even if CXXFLAGS is set, in case the package
# plays around with CXXFLAGS (such as to build both debugging and
# normal versions of a library), tasteless as that idea is.
+# Don't consider -g to work if it generates warnings when plain compiles don't.
m4_define([_AC_PROG_CXX_G],
[ac_test_CXXFLAGS=${CXXFLAGS+set}
ac_save_CXXFLAGS=$CXXFLAGS
-CXXFLAGS="-g"
AC_CACHE_CHECK(whether $CXX accepts -g, ac_cv_prog_cxx_g,
- [_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
- [ac_cv_prog_cxx_g=yes],
- [ac_cv_prog_cxx_g=no])])
+ [ac_save_cxx_werror_flag=$ac_cxx_werror_flag
+ ac_cxx_werror_flag=yes
+ ac_cv_prog_cxx_g=no
+ CXXFLAGS="-g"
+ _AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+ [ac_cv_prog_cxx_g=yes],
+ [CXXFLAGS=""
+ _AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+ [],
+ [ac_cxx_werror_flag=$ac_save_cxx_werror_flag
+ CXXFLAGS="-g"
+ _AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+ [ac_cv_prog_cxx_g=yes])])])
+ ac_cxx_werror_flag=$ac_save_cxx_werror_flag])
if test "$ac_test_CXXFLAGS" = set; then
CXXFLAGS=$ac_save_CXXFLAGS
elif test $ac_cv_prog_cxx_g = yes; then
if test "$GXX" = yes; then
- CXXFLAGS="$CXXFLAGS -g -O2"
+ CXXFLAGS="-g -O2"
else
- CXXFLAGS="$CXXFLAGS -g"
+ CXXFLAGS="-g"
fi
else
if test "$GXX" = yes; then
])# _AC_PROG_CXX_G
-# _AC_PROG_CXX_EXIT_DECLARATION
-# -----------------------------
-# If <stdlib.h> doesn't already provide a valid prototype for exit,
-# determine the appropriate prototype and put it in confdefs.h.
-# This macro is run only when testing a C++ compiler, but it generates
-# a prototype that is also appropriate for C compilers in order to
-# support a mixed C/C++ configuration environment.
-# We don't need to worry about this for C, since we include <stdlib.h>
-# if it is available, and that method works for all C compilers.
-m4_define([_AC_PROG_CXX_EXIT_DECLARATION],
-[for ac_declaration in \
- '' \
- 'extern "C" void std::exit (int) throw (); using std::exit;' \
- 'extern "C" void std::exit (int); using std::exit;' \
- 'extern "C" void exit (int) throw ();' \
- 'extern "C" void exit (int);' \
- 'void exit (int);'
-do
- _AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$ac_declaration
-@%:@include <stdlib.h>],
- [exit (42);])],
- [],
- [continue])
- _AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$ac_declaration],
- [exit (42);])],
- [break])
-done
-rm -f conftest*
-if test -n "$ac_declaration"; then
- echo '#ifdef __cplusplus' >>confdefs.h
- echo $ac_declaration >>confdefs.h
- echo '#endif' >>confdefs.h
+# AC_PROG_CXX_C_O
+# ---------------
+# Test if the C++ compiler accepts the options `-c' and `-o'
+# simultaneously, and define `CXX_NO_MINUS_C_MINUS_O' if it does not.
+AC_DEFUN([AC_PROG_CXX_C_O],
+[AC_REQUIRE([AC_PROG_CXX])dnl
+AC_LANG_PUSH([C++])dnl
+AC_CACHE_CHECK([whether $CXX understands -c and -o together],
+ [ac_cv_prog_cxx_c_o],
+[AC_LANG_CONFTEST([AC_LANG_PROGRAM([])])
+# We test twice because some compilers refuse to overwrite an existing
+# `.o' file with `-o', although they will create one.
+ac_try='$CXX $CXXFLAGS -c conftest.$ac_ext -o conftest2.$ac_objext >&AS_MESSAGE_LOG_FD'
+rm -f conftest2.*
+if _AC_DO_VAR(ac_try) &&
+ test -f conftest2.$ac_objext &&
+ _AC_DO_VAR(ac_try); then
+ ac_cv_prog_cxx_c_o=yes
+else
+ ac_cv_prog_cxx_c_o=no
fi
-])# _AC_PROG_CXX_EXIT_DECLARATION
+rm -f conftest*])
+if test $ac_cv_prog_cxx_c_o = no; then
+ AC_DEFINE(CXX_NO_MINUS_C_MINUS_O, 1,
+ [Define to 1 if your C++ compiler doesn't accept
+ -c and -o together.])
+fi
+AC_LANG_POP([C++])dnl
+])# AC_PROG_CXX_C_O
+
+
+# ------------------------------ #
+# 3d. The Objective C compiler. #
+# ------------------------------ #
+
+
+# AC_LANG_PREPROC(Objective C)
+# ----------------------------
+# Find the Objective C preprocessor. Must be AC_DEFUN'd to be AC_REQUIRE'able.
+AC_DEFUN([AC_LANG_PREPROC(Objective C)],
+[AC_REQUIRE([AC_PROG_OBJCPP])])
+
+
+# AC_PROG_OBJCPP
+# --------------
+# Find a working Objective C preprocessor.
+AC_DEFUN([AC_PROG_OBJCPP],
+[AC_REQUIRE([AC_PROG_OBJC])dnl
+AC_ARG_VAR([OBJCPP], [Objective C preprocessor])dnl
+_AC_ARG_VAR_CPPFLAGS()dnl
+AC_LANG_PUSH(Objective C)dnl
+AC_MSG_CHECKING([how to run the Objective C preprocessor])
+if test -z "$OBJCPP"; then
+ AC_CACHE_VAL(ac_cv_prog_OBJCPP,
+ [dnl
+ # Double quotes because OBJCPP needs to be expanded
+ for OBJCPP in "$OBJC -E" "/lib/cpp"
+ do
+ _AC_PROG_PREPROC_WORKS_IFELSE([break])
+ done
+ ac_cv_prog_OBJCPP=$OBJCPP
+ ])dnl
+ OBJCPP=$ac_cv_prog_OBJCPP
+else
+ ac_cv_prog_OBJCPP=$OBJCPP
+fi
+AC_MSG_RESULT([$OBJCPP])
+_AC_PROG_PREPROC_WORKS_IFELSE([],
+ [AC_MSG_FAILURE([Objective C preprocessor "$OBJCPP" fails sanity check])])
+AC_SUBST(OBJCPP)dnl
+AC_LANG_POP(Objective C)dnl
+])# AC_PROG_OBJCPP
+
+
+# AC_LANG_COMPILER(Objective C)
+# -----------------------------
+# Find the Objective C compiler. Must be AC_DEFUN'd to be AC_REQUIRE'able.
+AC_DEFUN([AC_LANG_COMPILER(Objective C)],
+[AC_REQUIRE([AC_PROG_OBJC])])
+
+
+
+# AC_PROG_OBJC([LIST-OF-COMPILERS])
+# ---------------------------------
+# LIST-OF-COMPILERS is a space separated list of Objective C compilers to
+# search for (if not specified, a default list is used). This just gives
+# the user an opportunity to specify an alternative search list for the
+# Objective C compiler.
+# objcc StepStone Objective-C compiler (also "standard" name for OBJC)
+# objc David Stes' POC. If you installed this, you likely want it.
+# cc Native C compiler (for instance, Apple).
+# CC You never know.
+AN_MAKEVAR([OBJC], [AC_PROG_OBJC])
+AN_PROGRAM([objcc], [AC_PROG_OBJC])
+AN_PROGRAM([objc], [AC_PROG_OBJC])
+AC_DEFUN([AC_PROG_OBJC],
+[AC_LANG_PUSH(Objective C)dnl
+AC_ARG_VAR([OBJC], [Objective C compiler command])dnl
+AC_ARG_VAR([OBJCFLAGS], [Objective C compiler flags])dnl
+_AC_ARG_VAR_LDFLAGS()dnl
+_AC_ARG_VAR_LIBS()dnl
+_AC_ARG_VAR_CPPFLAGS()dnl
+_AC_ARG_VAR_PRECIOUS([OBJC])dnl
+AC_CHECK_TOOLS(OBJC,
+ [m4_default([$1], [gcc objcc objc cc CC])],
+ gcc)
+# Provide some information about the compiler.
+_AS_ECHO_LOG([checking for _AC_LANG compiler version])
+ac_compiler=`set X $ac_compile; echo $[2]`
+_AC_DO([$ac_compiler --version >&AS_MESSAGE_LOG_FD])
+_AC_DO([$ac_compiler -v >&AS_MESSAGE_LOG_FD])
+_AC_DO([$ac_compiler -V >&AS_MESSAGE_LOG_FD])
+
+m4_expand_once([_AC_COMPILER_EXEEXT])[]dnl
+m4_expand_once([_AC_COMPILER_OBJEXT])[]dnl
+_AC_LANG_COMPILER_GNU
+GOBJC=`test $ac_compiler_gnu = yes && echo yes`
+_AC_PROG_OBJC_G
+AC_LANG_POP(Objective C)dnl
+])# AC_PROG_OBJC
+
+
+# _AC_PROG_OBJC_G
+# ---------------
+# Check whether -g works, even if OBJCFLAGS is set, in case the package
+# plays around with OBJCFLAGS (such as to build both debugging and
+# normal versions of a library), tasteless as that idea is.
+# Don't consider -g to work if it generates warnings when plain compiles don't.
+m4_define([_AC_PROG_OBJC_G],
+[ac_test_OBJCFLAGS=${OBJCFLAGS+set}
+ac_save_OBJCFLAGS=$OBJCFLAGS
+AC_CACHE_CHECK(whether $OBJC accepts -g, ac_cv_prog_objc_g,
+ [ac_save_objc_werror_flag=$ac_objc_werror_flag
+ ac_objc_werror_flag=yes
+ ac_cv_prog_objc_g=no
+ OBJCFLAGS="-g"
+ _AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+ [ac_cv_prog_objc_g=yes],
+ [OBJCFLAGS=""
+ _AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+ [],
+ [ac_objc_werror_flag=$ac_save_objc_werror_flag
+ OBJCFLAGS="-g"
+ _AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+ [ac_cv_prog_objc_g=yes])])])
+ ac_objc_werror_flag=$ac_save_objc_werror_flag])
+if test "$ac_test_OBJCFLAGS" = set; then
+ OBJCFLAGS=$ac_save_OBJCFLAGS
+elif test $ac_cv_prog_objc_g = yes; then
+ if test "$GOBJC" = yes; then
+ OBJCFLAGS="-g -O2"
+ else
+ OBJCFLAGS="-g"
+ fi
+else
+ if test "$GOBJC" = yes; then
+ OBJCFLAGS="-O2"
+ else
+ OBJCFLAGS=
+ fi
+fi[]dnl
+])# _AC_PROG_OBJC_G
# 4b. C compiler characteristics. #
# -------------------------------- #
-# _AC_PROG_CC_STDC
-# ----------------
-# If the C compiler in not in ANSI C mode by default, try to add an
-# option to output variable @code{CC} to make it so. This macro tries
-# various options that select ANSI C on some system or another. It
-# considers the compiler to be in ANSI C mode if it handles function
-# prototypes correctly.
-AC_DEFUN([_AC_PROG_CC_STDC],
-[AC_MSG_CHECKING([for $CC option to accept ANSI C])
-AC_CACHE_VAL(ac_cv_prog_cc_stdc,
-[ac_cv_prog_cc_stdc=no
-ac_save_CC=$CC
-AC_LANG_CONFTEST([AC_LANG_PROGRAM(
+# _AC_PROG_CC_C89 ([ACTION-IF-AVAILABLE], [ACTION-IF-UNAVAILABLE])
+# ----------------------------------------------------------------
+# If the C compiler is not in ANSI C89 (ISO C90) mode by default, try
+# to add an option to output variable CC to make it so. This macro
+# tries various options that select ANSI C89 on some system or
+# another. It considers the compiler to be in ANSI C89 mode if it
+# handles function prototypes correctly.
+AC_DEFUN([_AC_PROG_CC_C89],
+[_AC_C_STD_TRY([c89],
[[#include <stdarg.h>
#include <stdio.h>
#include <sys/types.h>
/* OSF 4.0 Compaq cc is some sort of almost-ANSI by default. It has
function prototypes and stuff, but not '\xHH' hex character constants.
These don't provoke an error unfortunately, instead are silently treated
- as 'x'. The following induces an error, until -std1 is added to get
+ as 'x'. The following induces an error, until -std is added to get
proper ANSI mode. Curiously '\x00'!='x' always comes out true, for an
array size at least. It's necessary to write '\x00'==0 to get something
- that's true only with -std1. */
+ that's true only with -std. */
int osf4_cc_array ['\x00' == 0 ? 1 : -1];
+/* IBM C 6 for AIX is almost-ANSI by default, but it replaces macro parameters
+ inside strings and character constants. */
+#define FOO(x) 'x'
+int xlc6_cc_array[FOO(a) == 'x' ? 1 : -1];
+
int test (int i, double x);
struct s1 {int (*f) (int a);};
struct s2 {int (*f) (double a);};
int pairnames (int, char **, FILE *(*)(struct buf *, struct stat *, int), int, int);
int argc;
char **argv;]],
-[[return f (e, argv, 0) != argv[0] || f (e, argv, 1) != argv[1];]])])
-# Don't try gcc -ansi; that turns off useful extensions and
-# breaks some systems' header files.
-# AIX -qlanglvl=ansi
-# Ultrix and OSF/1 -std1
-# HP-UX 10.20 and later -Ae
-# HP-UX older versions -Aa -D_HPUX_SOURCE
-# SVR4 -Xc -D__EXTENSIONS__
-for ac_arg in "" -qlanglvl=ansi -std1 -Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
+[[return f (e, argv, 0) != argv[0] || f (e, argv, 1) != argv[1];]],
+dnl Don't try gcc -ansi; that turns off useful extensions and
+dnl breaks some systems' header files.
+dnl AIX circa 2003 -qlanglvl=extc89
+dnl old AIX -qlanglvl=ansi
+dnl Ultrix, OSF/1, Tru64 -std
+dnl HP-UX 10.20 and later -Ae
+dnl HP-UX older versions -Aa -D_HPUX_SOURCE
+dnl SVR4 -Xc -D__EXTENSIONS__
+[-qlanglvl=extc89 -qlanglvl=ansi -std \
+ -Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"], [$1], [$2])[]dnl
+])# _AC_PROG_CC_C89
+
+
+# _AC_C_STD_TRY(STANDARD, TEST-PROLOGUE, TEST-BODY, OPTION-LIST,
+# ACTION-IF-AVAILABLE, ACTION-IF-UNAVAILABLE)
+# --------------------------------------------------------------
+# Check whether the C compiler accepts features of STANDARD (e.g `c89', `c99')
+# by trying to compile a program of TEST-PROLOGUE and TEST-BODY. If this fails,
+# try again with each compiler option in the space-separated OPTION-LIST; if one
+# helps, append it to CC. If eventually successful, run ACTION-IF-AVAILABLE,
+# else ACTION-IF-UNAVAILABLE.
+AC_DEFUN([_AC_C_STD_TRY],
+[AC_MSG_CHECKING([for $CC option to accept ISO ]m4_translit($1, [c], [C]))
+AC_CACHE_VAL(ac_cv_prog_cc_$1,
+[ac_cv_prog_cc_$1=no
+ac_save_CC=$CC
+AC_LANG_CONFTEST([AC_LANG_PROGRAM([$2], [$3])])
+for ac_arg in '' $4
do
CC="$ac_save_CC $ac_arg"
- _AC_COMPILE_IFELSE([],
- [ac_cv_prog_cc_stdc=$ac_arg
-break])
+ _AC_COMPILE_IFELSE([], [ac_cv_prog_cc_$1=$ac_arg])
+ test "x$ac_cv_prog_cc_$1" != "xno" && break
done
-rm -f conftest.$ac_ext conftest.$ac_objext
+rm -f conftest.$ac_ext
CC=$ac_save_CC
-])
-case "x$ac_cv_prog_cc_stdc" in
- x|xno)
+])# AC_CACHE_VAL
+case "x$ac_cv_prog_cc_$1" in
+ x)
AC_MSG_RESULT([none needed]) ;;
+ xno)
+ AC_MSG_RESULT([unsupported]) ;;
*)
- AC_MSG_RESULT([$ac_cv_prog_cc_stdc])
- CC="$CC $ac_cv_prog_cc_stdc" ;;
+ CC="$CC $ac_cv_prog_cc_$1"
+ AC_MSG_RESULT([$ac_cv_prog_cc_$1]) ;;
esac
-])# _AC_PROG_CC_STDC
+AS_IF([test "x$ac_cv_prog_cc_$1" != xno], [$5], [$6])
+])# _AC_C_STD_TRY
+
+
+# _AC_PROG_CC_C99 ([ACTION-IF-AVAILABLE], [ACTION-IF-UNAVAILABLE])
+# ----------------------------------------------------------------
+# If the C compiler is not in ISO C99 mode by default, try to add an
+# option to output variable CC to make it so. This macro tries
+# various options that select ISO C99 on some system or another. It
+# considers the compiler to be in ISO C99 mode if it handles _Bool,
+# // comments, flexible array members, inline, long long int, mixed
+# code and declarations, named initialization of structs, restrict,
+# va_copy, varargs macros, variable declarations in for loops and
+# variable length arrays.
+AC_DEFUN([_AC_PROG_CC_C99],
+[_AC_C_STD_TRY([c99],
+[[#include <stdarg.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <wchar.h>
+#include <stdio.h>
+
+// Check varargs macros. These examples are taken from C99 6.10.3.5.
+#define debug(...) fprintf (stderr, __VA_ARGS__)
+#define showlist(...) puts (#__VA_ARGS__)
+#define report(test,...) ((test) ? puts (#test) : printf (__VA_ARGS__))
+static void
+test_varargs_macros (void)
+{
+ int x = 1234;
+ int y = 5678;
+ debug ("Flag");
+ debug ("X = %d\n", x);
+ showlist (The first, second, and third items.);
+ report (x>y, "x is %d but y is %d", x, y);
+}
+
+// Check long long types.
+#define BIG64 18446744073709551615ull
+#define BIG32 4294967295ul
+#define BIG_OK (BIG64 / BIG32 == 4294967297ull && BIG64 % BIG32 == 0)
+#if !BIG_OK
+ your preprocessor is broken;
+#endif
+#if BIG_OK
+#else
+ your preprocessor is broken;
+#endif
+static long long int bignum = -9223372036854775807LL;
+static unsigned long long int ubignum = BIG64;
+
+struct incomplete_array
+{
+ int datasize;
+ double data[];
+};
+
+struct named_init {
+ int number;
+ const wchar_t *name;
+ double average;
+};
+
+typedef const char *ccp;
+
+static inline int
+test_restrict (ccp restrict text)
+{
+ // See if C++-style comments work.
+ // Iterate through items via the restricted pointer.
+ // Also check for declarations in for loops.
+ for (unsigned int i = 0; *(text+i) != '\0'; ++i)
+ continue;
+ return 0;
+}
+
+// Check varargs and va_copy.
+static void
+test_varargs (const char *format, ...)
+{
+ va_list args;
+ va_start (args, format);
+ va_list args_copy;
+ va_copy (args_copy, args);
+
+ const char *str;
+ int number;
+ float fnumber;
+
+ while (*format)
+ {
+ switch (*format++)
+ {
+ case 's': // string
+ str = va_arg (args_copy, const char *);
+ break;
+ case 'd': // int
+ number = va_arg (args_copy, int);
+ break;
+ case 'f': // float
+ fnumber = va_arg (args_copy, double);
+ break;
+ default:
+ break;
+ }
+ }
+ va_end (args_copy);
+ va_end (args);
+}
+]],
+[[
+ // Check bool.
+ _Bool success = false;
+
+ // Check restrict.
+ if (test_restrict ("String literal") == 0)
+ success = true;
+ char *restrict newvar = "Another string";
+
+ // Check varargs.
+ test_varargs ("s, d' f .", "string", 65, 34.234);
+ test_varargs_macros ();
+
+ // Check flexible array members.
+ struct incomplete_array *ia =
+ malloc (sizeof (struct incomplete_array) + (sizeof (double) * 10));
+ ia->datasize = 10;
+ for (int i = 0; i < ia->datasize; ++i)
+ ia->data[i] = i * 1.234;
+
+ // Check named initializers.
+ struct named_init ni = {
+ .number = 34,
+ .name = L"Test wide string",
+ .average = 543.34343,
+ };
+
+ ni.number = 58;
+
+ int dynamic_array[ni.number];
+ dynamic_array[ni.number - 1] = 543;
+
+ // work around unused variable warnings
+ return (!success || bignum == 0LL || ubignum == 0uLL || newvar[0] == 'x'
+ || dynamic_array[ni.number - 1] != 543);
+]],
+dnl Try
+dnl GCC -std=gnu99 (unused restrictive modes: -std=c99 -std=iso9899:1999)
+dnl AIX -qlanglvl=extc99 (unused restrictive mode: -qlanglvl=stdc99)
+dnl Intel ICC -c99
+dnl IRIX -c99
+dnl Solaris (unused because it causes the compiler to assume C99 semantics for
+dnl library functions, and this is invalid before Solaris 10: -xc99)
+dnl Tru64 -c99
+dnl with extended modes being tried first.
+[[-std=gnu99 -c99 -qlanglvl=extc99]], [$1], [$2])[]dnl
+])# _AC_PROG_CC_C99
+
+
+# AC_PROG_CC_C89
+# --------------
+AC_DEFUN([AC_PROG_CC_C89],
+[ AC_REQUIRE([AC_PROG_CC])dnl
+ _AC_PROG_CC_C89
+])
+
+
+# AC_PROG_CC_C99
+# --------------
+AC_DEFUN([AC_PROG_CC_C99],
+[ AC_REQUIRE([AC_PROG_CC])dnl
+ _AC_PROG_CC_C99
+])
# AC_PROG_CC_STDC
# ---------------
-# Has been merged into AC_PROG_CC.
-AU_DEFUN([AC_PROG_CC_STDC], [])
+AC_DEFUN([AC_PROG_CC_STDC],
+[ AC_REQUIRE([AC_PROG_CC])dnl
+ AS_CASE([$ac_cv_prog_cc_stdc],
+ [no], [ac_cv_prog_cc_c99=no; ac_cv_prog_cc_c89=no],
+ [_AC_PROG_CC_C99([ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c99],
+ [_AC_PROG_CC_C89([ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c89],
+ [ac_cv_prog_cc_stdc=no])])])dnl
+ AC_MSG_CHECKING([for $CC option to accept ISO Standard C])
+ AC_CACHE_VAL([ac_cv_prog_cc_stdc], [])
+ AS_CASE([$ac_cv_prog_cc_stdc],
+ [no], [AC_MSG_RESULT([unsupported])],
+ [''], [AC_MSG_RESULT([none needed])],
+ [AC_MSG_RESULT([$ac_cv_prog_cc_stdc])])
+])
# AC_C_BACKSLASH_A
])# AC_C_CHAR_UNSIGNED
-# AC_C_LONG_DOUBLE
-# ----------------
-AC_DEFUN([AC_C_LONG_DOUBLE],
-[AC_CACHE_CHECK(
- [for working long double with more range or precision than double],
- [ac_cv_c_long_double],
- [AC_COMPILE_IFELSE(
- [AC_LANG_BOOL_COMPILE_TRY(
- [#include <float.h>
- long double foo = 0.0;],
- [/* Using '|' rather than '||' catches a GCC 2.95.2 x86 bug. */
- (DBL_MAX < LDBL_MAX) | (LDBL_EPSILON < DBL_EPSILON)
- | (DBL_MAX_EXP < LDBL_MAX_EXP) | (DBL_MANT_DIG < LDBL_MANT_DIG)])],
- ac_cv_c_long_double=yes,
- ac_cv_c_long_double=no)])
-if test $ac_cv_c_long_double = yes; then
- AC_DEFINE(HAVE_LONG_DOUBLE, 1,
- [Define to 1 if long double works and has more range or precision than double.])
-fi
-])# AC_C_LONG_DOUBLE
-
-
# AC_C_BIGENDIAN ([ACTION-IF-TRUE], [ACTION-IF-FALSE], [ACTION-IF-UNKNOWN])
# -------------------------------------------------------------------------
AC_DEFUN([AC_C_BIGENDIAN],
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
#include <sys/param.h>
],
-[#if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
+[#if ! (defined BYTE_ORDER && defined BIG_ENDIAN && defined LITTLE_ENDIAN \
+ && BYTE_ORDER && BIG_ENDIAN && LITTLE_ENDIAN)
bogus endian macros
#endif
])],
])], [ac_cv_c_bigendian=yes], [ac_cv_c_bigendian=no])],
[# It does not; compile a test program.
AC_RUN_IFELSE(
-[AC_LANG_SOURCE([[int
-main ()
-{
+[AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT], [[
/* Are we little or big endian? From Harbison&Steele. */
union
{
- long l;
- char c[sizeof (long)];
+ long int l;
+ char c[sizeof (long int)];
} u;
u.l = 1;
- exit (u.c[sizeof (long) - 1] == 1);
-}]])],
+ return u.c[sizeof (long int) - 1] == 1;
+]])],
[ac_cv_c_bigendian=no],
[ac_cv_c_bigendian=yes],
[# try to guess the endianness by grepping values into an object file
ac_cv_c_bigendian=unknown
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
-[[short ascii_mm[] = { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
-short ascii_ii[] = { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };
+[[short int ascii_mm[] = { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
+short int ascii_ii[] = { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };
void _ascii () { char *s = (char *) ascii_mm; s = (char *) ascii_ii; }
-short ebcdic_ii[] = { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };
-short ebcdic_mm[] = { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };
+short int ebcdic_ii[] = { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };
+short int ebcdic_mm[] = { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };
void _ebcdic () { char *s = (char *) ebcdic_mm; s = (char *) ebcdic_ii; }]],
[[ _ascii (); _ebcdic (); ]])],
[if grep BIGenDianSyS conftest.$ac_objext >/dev/null ; then
$ac_kw foo_t foo () {return 0; }
#endif
])],
- [ac_cv_c_inline=$ac_kw; break])
+ [ac_cv_c_inline=$ac_kw])
+ test "$ac_cv_c_inline" != no && break
done
])
AH_VERBATIM([inline],
#ifndef __cplusplus
/* Ultrix mips cc rejects this. */
typedef int charset[2];
- const charset x;
+ const charset cs;
/* SunOS 4.1.1 cc rejects this. */
- char const *const *ccp;
- char **p;
+ char const *const *pcpcc;
+ char **ppc;
/* NEC SVR4.0.2 mips cc rejects this. */
struct point {int x, y;};
static struct point const zero = {0,0};
an arm of an if-expression whose if-part is not a constant
expression */
const char *g = "string";
- ccp = &g + (g ? g-g : 0);
+ pcpcc = &g + (g ? g-g : 0);
/* HPUX 7.0 cc rejects these. */
- ++ccp;
- p = (char**) ccp;
- ccp = (char const *const *) p;
+ ++pcpcc;
+ ppc = (char**) pcpcc;
+ pcpcc = (char const *const *) ppc;
{ /* SCO 3.2v4 cc rejects this. */
char *t;
char const *s = 0 ? (char *) 0 : (char const *) 0;
*t++ = 0;
+ if (s) return 0;
}
{ /* Someone thinks the Sun supposedly-ANSI compiler will reject this. */
int x[] = {25, 17};
}
{ /* ULTRIX-32 V3.1 (Rev 9) vcc rejects this */
const int foo = 10;
+ if (!foo) return 0;
}
+ return !cs[0] && !zero.x;
#endif
]])],
[ac_cv_c_const=yes],
# AC_C_RESTRICT
# -------------
# based on acx_restrict.m4, from the GNU Autoconf Macro Archive at:
-# http://www.gnu.org/software/ac-archive/htmldoc/acx_restrict.html
+# http://autoconf-archive.cryp.to/acx_restrict.html
#
# Determine whether the C/C++ compiler supports the "restrict" keyword
# introduced in ANSI C99, or an equivalent. Do nothing if the compiler
# Try the official restrict keyword, then gcc's __restrict, and
# the less common variants.
for ac_kw in restrict __restrict __restrict__ _Restrict; do
- AC_COMPILE_IFELSE([AC_LANG_SOURCE(
- [float * $ac_kw x;])],
- [ac_cv_c_restrict=$ac_kw; break])
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+ [[typedef int * int_ptr;
+ int foo (int_ptr $ac_kw ip) {
+ return ip[0];
+ }]],
+ [[int s[1];
+ int * $ac_kw t = s;
+ t[0] = 0;
+ return foo(t)]])],
+ [ac_cv_c_restrict=$ac_kw])
+ test "$ac_cv_c_restrict" != no && break
done
])
case $ac_cv_c_restrict in
[AC_CACHE_CHECK([for working volatile], ac_cv_c_volatile,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
volatile int x;
-int * volatile y;])],
+int * volatile y = (int *) 0;
+return !x && !y;])],
[ac_cv_c_volatile=yes],
[ac_cv_c_volatile=no])])
if test $ac_cv_c_volatile = no; then
AC_DEFUN([AC_C_PROTOTYPES],
[AC_REQUIRE([AC_PROG_CC])dnl
AC_MSG_CHECKING([for function prototypes])
-if test "$ac_cv_prog_cc_stdc" != no; then
+if test "$ac_cv_prog_cc_c89" != no; then
AC_MSG_RESULT([yes])
AC_DEFINE(PROTOTYPES, 1,
[Define to 1 if the C compiler supports function prototypes.])
AC_MSG_RESULT([no])
fi
])# AC_C_PROTOTYPES
+
+
+# AC_C_FLEXIBLE_ARRAY_MEMBER
+# --------------------------
+# Check whether the C compiler supports flexible array members.
+AC_DEFUN([AC_C_FLEXIBLE_ARRAY_MEMBER],
+[
+ AC_CACHE_CHECK([for flexible array members],
+ ac_cv_c_flexmember,
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <stdlib.h>
+ #include <stdio.h>
+ #include <stddef.h>
+ struct s { int n; double d[]; };]],
+ [[int m = getchar ();
+ struct s *p = malloc (offsetof (struct s, d)
+ + m * sizeof (double));
+ p->d[0] = 0.0;
+ return p->d != (double *) NULL;]])],
+ [ac_cv_c_flexmember=yes],
+ [ac_cv_c_flexmember=no])])
+ if test $ac_cv_c_flexmember = yes; then
+ AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], [],
+ [Define to nothing if C supports flexible array members, and to
+ 1 if it does not. That way, with a declaration like `struct s
+ { int n; double d@<:@FLEXIBLE_ARRAY_MEMBER@:>@; };', the struct hack
+ can be used with pre-C99 compilers.
+ When computing the size of such an object, don't use 'sizeof (struct s)'
+ as it overestimates the size. Use 'offsetof (struct s, d)' instead.
+ Don't use 'offsetof (struct s, d@<:@0@:>@)', as this doesn't work with
+ MSVC and with C++ compilers.])
+ else
+ AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], 1)
+ fi
+])
+
+
+# AC_C_VARARRAYS
+# --------------
+# Check whether the C compiler supports variable-length arrays.
+AC_DEFUN([AC_C_VARARRAYS],
+[
+ AC_CACHE_CHECK([for variable-length arrays],
+ ac_cv_c_vararrays,
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([],
+ [[static int x; char a[++x]; a[sizeof a - 1] = 0; return a[0];]])],
+ [ac_cv_c_vararrays=yes],
+ [ac_cv_c_vararrays=no])])
+ if test $ac_cv_c_vararrays = yes; then
+ AC_DEFINE([HAVE_C_VARARRAYS], 1,
+ [Define to 1 if C supports variable-length arrays.])
+ fi
+])
+
+
+# AC_C_TYPEOF
+# -----------
+# Check if the C compiler supports GCC's typeof syntax.
+# The test case provokes incompatibilities in the Sun C compilers
+# (both Solaris 8 and Solaris 10).
+AC_DEFUN([AC_C_TYPEOF],
+[
+ AC_CACHE_CHECK([for typeof syntax and keyword spelling], ac_cv_c_typeof,
+ [ac_cv_c_typeof=no
+ for ac_kw in typeof __typeof__ no; do
+ test $ac_kw = no && break
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
+ [[
+ int value;
+ typedef struct {
+ char a [1
+ + ! (($ac_kw (value))
+ (($ac_kw (value)) 0 < ($ac_kw (value)) -1
+ ? ($ac_kw (value)) - 1
+ : ~ (~ ($ac_kw (value)) 0
+ << sizeof ($ac_kw (value)))))]; }
+ ac__typeof_type_;
+ return
+ (! ((void) ((ac__typeof_type_ *) 0), 0));
+ ]])],
+ [ac_cv_c_typeof=$ac_kw])
+ test $ac_cv_c_typeof != no && break
+ done])
+ if test $ac_cv_c_typeof != no; then
+ AC_DEFINE([HAVE_TYPEOF], 1,
+ [Define to 1 if typeof works with your compiler.])
+ if test $ac_cv_c_typeof != typeof; then
+ AC_DEFINE_UNQUOTED([typeof], [$ac_cv_c_typeof],
+ [Define to __typeof__ if your compiler spells it that way.])
+ fi
+ fi
+])
projects / wxWidgets.git / blobdiff