1 # Extra autoconf macros for the Glasgow fptools
3 # To be a good autoconf citizen, names of local macros have prefixed with FP_ to
4 # ensure we don't clash with any pre-supplied autoconf ones.
7 # FP_EVAL_STDERR(COMMAND)
8 # -----------------------
9 # Eval COMMAND, save its stderr (without lines resulting from shell tracing)
10 # into the file conftest.err and the exit status in the variable fp_status.
11 AC_DEFUN([FP_EVAL_STDERR],
12 [{ (eval $1) 2>conftest.er1
14 grep -v '^ *+' conftest.er1 >conftest.err
16 (exit $fp_status); }[]dnl
20 # FP_CHECK_FLAG(FLAG, [ACTION-IF-SUPPORTED], [ACTION-IF-NOT-SUPPORTED])
21 # ---------------------------------------------------------------------
22 # Check to see whether the compiler for the current language supports a
25 # Implementation note: When given an unkown option, GCC issues an warning on
26 # stderr only, but returns an exit value of 0 nevertheless. Consequently we have
27 # to check stderr *and* the exit value.
30 AC_DEFUN(FP_CHECK_FLAG,
31 [AC_LANG_COMPILER_REQUIRE()dnl
32 AC_LANG_CASE([C], [fp_compiler="$CC" m4_pushdef([fp_Flags], [CFLAGS])],
33 [C++], [fp_compiler="$CXX" m4_pushdef([fp_Flags], [CXXFLAGS])],
34 [Fortran 77], [fp_compiler="$F77" m4_pushdef([fp_Flags], [FFLAGS])])
35 m4_pushdef([fp_Cache], [fp_cv_[]fp_Flags[]AS_TR_SH([$1])])[]dnl
36 AC_CACHE_CHECK([whether $fp_compiler accepts $1], [fp_Cache],
37 [AC_LANG_CONFTEST([AC_LANG_PROGRAM()])
38 fp_save_flags="$fp_Flags"
39 fp_Flags="$fp_Flags $1"
41 if FP_EVAL_STDERR([$ac_compile conftest.$ac_ext]) >/dev/null; then
42 test -s conftest.err || fp_Cache=yes
44 fp_Flags="$fp_save_flags"
45 rm -f conftest.err conftest.$ac_ext])
46 AS_IF([test $fp_Cache = yes], [$2], [$3])[]dnl
47 m4_popdef([fp_Cache])[]dnl
48 m4_popdef([fp_Flags])[]dnl
52 # FP_PROG_CONTEXT_DIFF
53 # --------------------
54 # Figure out how to do context diffs. Sets the output variable ContextDiffCmd.
56 # Note: NeXTStep thinks diff'ing a file against itself is "trouble".
58 # Used by ghc, glafp-utils/ltx, and glafp-utils/runstdtest.
59 AC_DEFUN([FP_PROG_CONTEXT_DIFF],
60 [AC_CACHE_CHECK([for a working context diff], [fp_cv_context_diff],
64 for fp_var in '-C 1' '-c1'
66 if diff $fp_var conftest1 conftest2 > /dev/null 2>&1; then
67 fp_cv_context_diff="diff $fp_var"
71 if test x"$fp_cv_context_diff" = xno; then
72 AC_MSG_ERROR([cannot figure out how to do context diffs])
74 AC_SUBST(ContextDiffCmd, [$fp_cv_context_diff])
75 ])# FP_PROG_CONTEXT_DIFF
80 # Defines HAVE_DECL_ALTZONE to 1 if declared, 0 otherwise.
82 # Used by base package.
83 AC_DEFUN([FP_DECL_ALTZONE],
84 [AC_REQUIRE([AC_HEADER_TIME])dnl
85 AC_CHECK_HEADERS([sys/time.h])
86 AC_CHECK_DECLS([altzone], [], [],[#if TIME_WITH_SYS_TIME
87 # include <sys/time.h>
91 # include <sys/time.h>
99 # FP_COMPUTE_INT(EXPRESSION, VARIABLE, INCLUDES, IF-FAILS)
100 # --------------------------------------------------------
101 # Assign VARIABLE the value of the compile-time EXPRESSION using INCLUDES for
102 # compilation. Execute IF-FAILS when unable to determine the value. Works for
103 # cross-compilation, too.
105 # Implementation note: We are lazy and use an internal autoconf macro, but it
106 # is supported in autoconf versions 2.50 up to the actual 2.57, so there is
108 AC_DEFUN([FP_COMPUTE_INT],
109 [_AC_COMPUTE_INT([$1], [$2], [$3], [$4])[]dnl
113 # FP_CHECK_ALIGNMENT(TYPE, [IGNORED], [INCLUDES = DEFAULT-INCLUDES])
114 # ------------------------------------------------------------------
115 # A variation of AC_CHECK_SIZEOF for computing the alignment restrictions of a
116 # given type. Defines ALIGNMENT_TYPE.
117 AC_DEFUN([FP_CHECK_ALIGNMENT],
118 [AS_LITERAL_IF([$1], [],
119 [AC_FATAL([$0: requires literal arguments])])[]dnl
120 AC_CHECK_TYPE([$1], [], [], [$3])[]dnl
121 m4_pushdef([fp_Cache], [AS_TR_SH([fp_cv_alignment_$1])])[]dnl
122 AC_CACHE_CHECK([alignment of $1], [fp_Cache],
123 [if test "$AS_TR_SH([ac_cv_type_$1])" = yes; then
124 FP_COMPUTE_INT([(long) (&((struct { char c; $1 ty; } *)0)->ty)],
126 [AC_INCLUDES_DEFAULT([$3])],
127 [AC_MSG_ERROR([cannot compute alignment ($1)
128 See `config.log' for more details.], [77])])
132 AC_DEFINE_UNQUOTED(AS_TR_CPP(alignment_$1), $fp_Cache, [The alignment of a `$1'.])[]dnl
133 m4_popdef([fp_Cache])[]dnl
134 ])# FP_CHECK_ALIGNMENT
137 # FP_CHECK_CONST(EXPRESSION, [INCLUDES = DEFAULT-INCLUDES], [VALUE-IF-FAIL = -1])
138 # -------------------------------------------------------------------------------
139 # Defines CONST_EXPRESSION to the value of the compile-time EXPRESSION, using
140 # INCLUDES. If the value cannot be determined, use VALUE-IF-FAIL.
141 AC_DEFUN([FP_CHECK_CONST],
142 [AS_VAR_PUSHDEF([fp_Cache], [fp_cv_const_$1])[]dnl
143 AC_CACHE_CHECK([value of $1], fp_Cache,
144 [FP_COMPUTE_INT([$1], fp_check_const_result, [AC_INCLUDES_DEFAULT([$2])],
145 [fp_check_const_result=m4_default([$3], ['-1'])])
146 AS_VAR_SET(fp_Cache, [$fp_check_const_result])])[]dnl
147 AC_DEFINE_UNQUOTED(AS_TR_CPP([CONST_$1]), AS_VAR_GET(fp_Cache), [The value of $1.])[]dnl
148 AS_VAR_POPDEF([fp_Cache])[]dnl
152 # FP_CHECK_CONSTS_TEMPLATE(EXPRESSION...)
153 # ---------------------------------------
154 # autoheader helper for FP_CHECK_CONSTS
155 m4_define([FP_CHECK_CONSTS_TEMPLATE],
156 [AC_FOREACH([fp_Const], [$1],
157 [AH_TEMPLATE(AS_TR_CPP(CONST_[]fp_Const),
158 [The value of ]fp_Const[.])])[]dnl
159 ])# FP_CHECK_CONSTS_TEMPLATE
162 # FP_CHECK_CONSTS(EXPRESSION..., [INCLUDES = DEFAULT-INCLUDES], [VALUE-IF-FAIL = -1])
163 # -----------------------------------------------------------------------------------
164 # List version of FP_CHECK_CONST
165 AC_DEFUN(FP_CHECK_CONSTS,
166 [FP_CHECK_CONSTS_TEMPLATE([$1])dnl
167 for fp_const_name in $1
169 FP_CHECK_CONST([$fp_const_name], [$2], [$3])
174 # FP_LEADING_UNDERSCORE
175 # ---------------------
176 # Test for determining whether symbol names have a leading underscore. We assume
177 # that they _haven't_ if anything goes wrong. Sets the output variable
178 # LeadingUnderscore to YES or NO and defines LEADING_UNDERSCORE correspondingly.
180 # Some nlist implementations seem to try to be compatible by ignoring a leading
181 # underscore sometimes (eg. FreeBSD). We therefore have to work around this by
182 # checking for *no* leading underscore first. Sigh. --SDM
184 # Similarly on OpenBSD, but this test doesn't help. -- dons
185 AC_DEFUN([FP_LEADING_UNDERSCORE],
186 [AC_CHECK_LIB([elf], [nlist], [LIBS="-lelf $LIBS"])
187 AC_CACHE_CHECK([leading underscore in symbol names], [fptools_cv_leading_underscore], [
188 # Hack!: nlist() under Digital UNIX insist on there being an _,
189 # but symbol table listings shows none. What is going on here?!?
191 # Another hack: cygwin doesn't come with nlist.h , so we hardwire
192 # the underscoredness of that "platform"
193 case $HostPlatform in
194 *openbsd*) # x86 openbsd is ELF from 3.4 >, meaning no leading uscore
196 i386-*2\.@<:@0-9@:>@ | i386-*3\.@<:@0-3@:>@ ) fptools_cv_leading_underscore=yes ;;
197 *) fptools_cv_leading_underscore=no ;;
199 alpha-dec-osf*) fptools_cv_leading_underscore=no;;
200 *cygwin32) fptools_cv_leading_underscore=yes;;
201 *mingw32) fptools_cv_leading_underscore=yes;;
202 *) AC_RUN_IFELSE([AC_LANG_SOURCE([[#ifdef HAVE_NLIST_H
204 struct nlist xYzzY1[] = {{"xYzzY1", 0},{0}};
205 struct nlist xYzzY2[] = {{"_xYzzY2", 0},{0}};
213 if(nlist(argv[0], xYzzY1) == 0 && xYzzY1[0].n_value != 0)
215 if(nlist(argv[0], xYzzY2) == 0 && xYzzY2[0].n_value != 0)
219 }]])],[fptools_cv_leading_underscore=yes],[fptools_cv_leading_underscore=no],[fptools_cv_leading_underscore=no])
222 AC_SUBST([LeadingUnderscore], [`echo $fptools_cv_leading_underscore | sed 'y/yesno/YESNO/'`])
223 if test x"$fptools_cv_leading_underscore" = xyes; then
224 AC_DEFINE([LEADING_UNDERSCORE], [1], [Define to 1 if C symbols have a leading underscore added by the compiler.])
225 fi])# FP_LEADING_UNDERSCORE
228 # FP_COMPARE_VERSIONS(VERSION1, TEST, VERSION2, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
229 # ----------------------------------------------------------------------------------
230 # Compare dotted version numbers VERSION1 and VERSION2 lexicographically according
231 # to TEST (one of -eq, -ne, -lt, -le, -gt, or -ge).
232 AC_DEFUN([FP_COMPARE_VERSIONS],
233 [fp_version1=$1; fp_version2=$3
234 fp_save_IFS=$IFS; IFS='.'
235 while test x"$fp_version1" != x || test x"$fp_version2" != x
238 set dummy $fp_version1; shift
240 test $[@%:@] = 0 || { fp_num1="[$]1"; shift; }
241 test x"$fp_num1" = x && fp_num1="0"
244 set dummy $fp_version2; shift
246 test $[@%:@] = 0 || { fp_num2="[$]1"; shift; }
247 test x"$fp_num2" = x && fp_num2="0"
250 test "$fp_num1" = "$fp_num2" || break;
253 AS_IF([test "$fp_num1" $2 "$fp_num2"], [$4], [$5])[]dnl
254 ])# FP_COMPARE_VERSIONS
258 dnl Check for GreenCard and version.
260 AC_DEFUN(FPTOOLS_GREENCARD,
262 AC_PATH_PROG(GreenCardCmd,greencard)
263 AC_CACHE_CHECK([for version of greencard], fptools_cv_greencard_version,
265 [if test x"$GreenCardCmd" != x; then
266 fptools_cv_greencard_version="`$GreenCardCmd --version |
267 grep 'version' | sed -e 's/greencard. version \([^ ]*\).*/\1/g'`"
269 fptools_cv_greencard_version=""
273 FP_COMPARE_VERSIONS([$fptools_cv_greencard_version],[-lt],[$1],
274 [AC_MSG_ERROR([greencard version $1 or later is required (found '$fptools_cv_greencard_version')])])[]dnl
275 GreenCardVersion=$fptools_cv_greencard_version
276 AC_SUBST(GreenCardVersion)
280 dnl Check for Happy and version. If we're building GHC, then we need
281 dnl at least Happy version 1.14. If there's no installed Happy, we look
282 dnl for a happy source tree and point the build system at that instead.
284 AC_DEFUN(FPTOOLS_HAPPY,
286 if test -d $srcdir/happy; then
287 SrcTreeHappyCmd=$hardtop/happy/src/happy-inplace
289 if test x"$UseSrcTreeHappy" = xYES; then
290 HappyCmd=$SrcTreeHappyCmd
292 AC_PATH_PROG(HappyCmd,happy,$SrcTreeHappyCmd)
294 AC_CACHE_CHECK([for version of happy], fptools_cv_happy_version,
296 [if test x"$HappyCmd" = x"$SrcTreeHappyCmd" -a -e $srcdir/happy/mk/version.mk; then
297 fptools_cv_happy_version=`grep '^ProjectVersion[ ]*=' $srcdir/happy/mk/version.mk | sed 's/.*\([0-9][0-9]*\.[0-9][0-9]*\).*/\1/g'`;
298 elif test x"$HappyCmd" != x; then
299 fptools_cv_happy_version="`$HappyCmd -v |
300 grep 'Happy Version' | sed -e 's/Happy Version \([^ ]*\).*/\1/g'`" ;
302 fptools_cv_happy_version="";
306 if test -d $srcdir/ghc -a ! -f $srcdir/ghc/compiler/parser/Parser.hs; then
307 FP_COMPARE_VERSIONS([$fptools_cv_happy_version],[-lt],[1.14],
308 [AC_MSG_ERROR([Happy version 1.14 or later is required to compile GHC.])])[]dnl
310 HappyVersion=$fptools_cv_happy_version;
311 AC_SUBST(HappyVersion)
315 dnl Check for Haddock and version. If there's no installed Haddock, we look
316 dnl for a haddock source tree and point the build system at that instead.
318 AC_DEFUN(FPTOOLS_HADDOCK,
320 if test -d $srcdir/haddock; then
321 SrcTreeHaddockCmd=$hardtop/haddock/src/haddock-inplace
323 if test x"$UseSrcTreeHaddock" = xYES; then
324 HaddockCmd=$SrcTreeHaddockCmd
326 AC_PATH_PROG(HaddockCmd,haddock,$SrcTreeHaddockCmd)
328 dnl Darn, I forgot to make Haddock print out its version number when
329 dnl invoked with -v. We could try generating some HTML and grepping
330 dnl through that to find the version number, but I think we'll make
331 dnl do without it for now.
335 dnl Check for Alex and version. If we're building GHC, then we need
336 dnl at least Alex version 2.0. If there's no installed Alex, we look
337 dnl for a alex source tree and point the build system at that instead.
339 AC_DEFUN(FPTOOLS_ALEX,
341 if test -d $srcdir/alex; then
342 SrcTreeAlexCmd=$hardtop/alex/src/alex-inplace
344 if test x"$UseSrcTreeAlex" = xYES; then
345 AlexCmd=$SrcTreeAlexCmd
347 AC_PATH_PROG(AlexCmd,alex,$SrcTreeAlexCmd)
349 AC_CACHE_CHECK([for version of alex], fptools_cv_alex_version,
351 [if test x"$AlexCmd" = x"$SrcTreeAlexCmd"; then
352 fptools_cv_alex_version=`grep '^ProjectVersion[ ]*=' $srcdir/alex/mk/version.mk | sed 's/.*\([0-9][0-9]*\.[0-9][0-9]*\).*/\1/g'`;
353 elif test x"$AlexCmd" != x; then
354 fptools_cv_alex_version="`$AlexCmd -v |
355 grep 'Alex [Vv]ersion' | sed -e 's/Alex [Vv]ersion \([0-9\.]*\).*/\1/g'`" ;
357 fptools_cv_alex_version="";
361 if test -d $srcdir/ghc -a ! -f $srcdir/ghc/compiler/parser/Lexer.hs; then
362 FP_COMPARE_VERSIONS([$fptools_cv_alex_version],[-lt],[2.0],
363 [AC_MSG_ERROR([Alex version 2.0 or later is required to compile GHC.])])[]dnl
365 AlexVersion=$fptools_cv_alex_version;
366 AC_SUBST(AlexVersion)
371 dnl Check whether ld supports -x
373 AC_DEFUN(FPTOOLS_LD_X,
374 [AC_CACHE_CHECK([whether ld understands -x], fptools_cv_ld_x,
376 echo 'foo() {}' > conftest.c
377 ${CC-cc} -c conftest.c
378 if ${LdCmd} -r -x -o foo.o conftest.o; then
383 rm -rf conftest.c conftest.o foo.o
385 if test "$fptools_cv_ld_x" = yes; then
396 # Sets fp_prog_ar_raw to the full path of ar and fp_prog_ar to a non-Cygwin
397 # version of it. Exits if no ar can be found
398 AC_DEFUN([FP_PROG_AR],
399 [AC_PATH_PROG([fp_prog_ar_raw], [ar])
400 if test -z "$fp_prog_ar_raw"; then
401 AC_MSG_ERROR([cannot find ar in your PATH, no idea how to make a library])
403 fp_prog_ar=$fp_prog_ar_raw
404 case $HostPlatform in
405 *mingw32) if test x${OSTYPE} != xmsys; then
406 fp_prog_ar="`cygpath -w ${fp_prog_ar_raw} | sed -e 's@\\\\@/@g'`"
407 AC_MSG_NOTICE([normalized ar command to $fp_prog_ar])
416 # Sets fp_prog_ar_is_gnu to yes or no, depending on whether it is GNU ar or not.
417 AC_DEFUN([FP_PROG_AR_IS_GNU],
418 [AC_REQUIRE([FP_PROG_AR])
419 AC_CACHE_CHECK([whether $fp_prog_ar_raw is GNU ar], [fp_cv_prog_ar_is_gnu],
420 [if $fp_prog_ar_raw --version 2> /dev/null | grep "GNU" > /dev/null 2>&1; then
421 fp_cv_prog_ar_is_gnu=yes
423 fp_cv_prog_ar_is_gnu=no
425 fp_prog_ar_is_gnu=$fp_cv_prog_ar_is_gnu
426 ])# FP_PROG_AR_IS_GNU
431 # Sets fp_prog_ar_args to the arguments for ar and the output variable ArCmd
432 # to a non-Cygwin invocation of ar including these arguments.
433 AC_DEFUN([FP_PROG_AR_ARGS],
434 [AC_REQUIRE([FP_PROG_AR_IS_GNU])
435 AC_CACHE_CHECK([for ar arguments], [fp_cv_prog_ar_args],
437 # GNU ar needs special treatment: it appears to have problems with
438 # object files with the same name if you use the 's' modifier, but
439 # simple 'ar q' works fine, and doesn't need a separate ranlib.
440 if test $fp_prog_ar_is_gnu = yes; then
441 fp_cv_prog_ar_args="q"
444 for fp_var in clqsZ clqs cqs clq cq ; do
446 if $fp_prog_ar_raw $fp_var conftest.a conftest.dummy > /dev/null 2> /dev/null; then
447 fp_cv_prog_ar_args=$fp_var
452 if test -z "$fp_cv_prog_ar_args"; then
453 AC_MSG_ERROR([cannot figure out how to use your $fp_prog_ar_raw])
456 fp_prog_ar_args=$fp_cv_prog_ar_args
457 AC_SUBST([ArCmd], ["$fp_prog_ar $fp_prog_ar_args"])
462 # FP_PROG_AR_NEEDS_RANLIB
463 # -----------------------
464 # Sets the output variable RANLIB to "ranlib" if it is needed and found,
466 AC_DEFUN([FP_PROG_AR_NEEDS_RANLIB],
467 [AC_REQUIRE([FP_PROG_AR_IS_GNU])
468 AC_REQUIRE([FP_PROG_AR_ARGS])
469 AC_CACHE_CHECK([whether ranlib is needed], [fp_cv_prog_ar_needs_ranlib],
470 [if test $fp_prog_ar_is_gnu = yes; then
471 fp_cv_prog_ar_needs_ranlib=no
472 elif echo $fp_prog_ar_args | grep "s" > /dev/null 2> /dev/null; then
473 fp_cv_prog_ar_needs_ranlib=no
475 fp_cv_prog_ar_needs_ranlib=yes
477 if test $fp_cv_prog_ar_needs_ranlib = yes; then
483 ])# FP_PROG_AR_NEEDS_RANLIB
486 # FP_PROG_AR_SUPPORTS_INPUT
487 # -------------------------
488 # Sets the output variable ArSupportsInput to "-input" or "", depending on
489 # whether ar supports -input flag is supported or not.
490 AC_DEFUN([FP_PROG_AR_SUPPORTS_INPUT],
491 [AC_REQUIRE([FP_PROG_AR_IS_GNU])
492 AC_REQUIRE([FP_PROG_AR_ARGS])
493 AC_CACHE_CHECK([whether $fp_prog_ar_raw supports -input], [fp_cv_prog_ar_supports_input],
494 [fp_cv_prog_ar_supports_input=no
495 if test $fp_prog_ar_is_gnu = no; then
498 if FP_EVAL_STDERR([$fp_prog_ar_raw $fp_prog_ar_args conftest.a -input conftest.lst]) >/dev/null; then
499 test -s conftest.err || fp_cv_prog_ar_supports_input=yes
503 if test $fp_cv_prog_ar_supports_input = yes; then
504 ArSupportsInput="-input"
508 AC_SUBST([ArSupportsInput])
509 ])# FP_PROG_AR_SUPPORTS_INPUT
513 dnl AC_SHEBANG_PERL - can we she-bang perl?
515 AC_DEFUN(FPTOOLS_SHEBANG_PERL,
516 [AC_CACHE_CHECK([if your perl works in shell scripts], fptools_cv_shebang_perl,
521 (SHELL=/bin/sh; export SHELL; ./conftest 69 > /dev/null)
522 if test $? -ne 69; then
523 fptools_cv_shebang_perl=yes
525 fptools_cv_shebang_perl=no
531 dnl Extra testing of the result AC_PROG_CC, testing the gcc version no.
532 dnl *Must* be called after AC_PROG_CC
534 AC_DEFUN(FPTOOLS_HAVE_GCC,
535 [AC_CACHE_CHECK([whether you have an ok gcc], fptools_cv_have_gcc,
536 [if test -z "$GCC"; then
538 echo "You would be better off with gcc"
539 echo "Perhaps it is already installed, but not in your PATH?"
540 fptools_cv_have_gcc='no'
543 gcc_version_str="`$CC -v 2>&1 | grep 'version ' | sed -e 's/.*version [^0-9]*\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\1\.\2/g' `"
545 fptools_cv_have_gcc='yes'
546 FP_COMPARE_VERSIONS([$gcc_version_str], [-lt], [2.0],
547 [fptools_cv_have_gcc='no'
549 echo "your gcc version appears to be ..."
551 echo "gcc prior to 2.0 and have never worked with ghc."
552 echo "we recommend 2.95.3, although versions back to 2.7.2 should be ok."
553 AC_MSG_ERROR([gcc 1.X has never been supported])])
556 HaveGcc=`echo $fptools_cv_have_gcc | sed 'y/yesno/YESNO/'`
558 GccVersion=`gcc --version | grep mingw | cut -f 3 -d ' '`
563 dnl Some OSs (Mandrake Linux, in particular) configure GCC with
564 dnl -momit-leaf-frame-pointer on by default. If this is the case, we
565 dnl need to turn it off for mangling to work. The test is currently a bit
566 dnl crude, using only the version number of gcc.
568 AC_DEFUN([FPTOOLS_GCC_NEEDS_NO_OMIT_LFPTR],
569 [AC_CACHE_CHECK([whether gcc needs -mno-omit-leaf-frame-pointer], [fptools_cv_gcc_needs_no_omit_lfptr],
570 [FP_COMPARE_VERSIONS([$gcc_version_str], [-ge], [3.2],
571 [fptools_cv_gcc_needs_no_omit_lfptr=yes],
572 [fptools_cv_gcc_needs_no_omit_lfptr=no])])
573 if test "$fptools_cv_gcc_needs_no_omit_lfptr" = "yes"; then
574 AC_DEFINE([HAVE_GCC_MNO_OMIT_LFPTR], [1], [Define to 1 if gcc supports -mno-omit-leaf-frame-pointer.])
575 fi])# FPTOOLS_GCC_NEEDS_NO_OMIT_LFPTR
578 dnl Small feature test for perl version. Assumes PerlCmd
579 dnl contains path to perl binary
581 AC_DEFUN(FPTOOLS_CHECK_PERL_VERSION,
582 [$PerlCmd -v >conftest.out 2>&1
583 if grep "version 5" conftest.out >/dev/null 2>&1; then
586 if grep "v5.6" conftest.out >/dev/null 2>&1; then
589 if grep "v5.8" conftest.out >/dev/null 2>&1; then
592 if grep "version 6" conftest.out >/dev/null 2>&1; then
595 echo "Your version of perl probably won't work."
604 # FP_CHECK_PROG(VARIABLE, PROG-TO-CHECK-FOR,
605 # [VALUE-IF-NOT-FOUND], [PATH], [REJECT])
606 # -----------------------------------------------------
607 # HACK: A small wrapper around AC_CHECK_PROG, setting VARIABLE to the full path
608 # of PROG-TO-CHECK-FOR when found.
609 AC_DEFUN([FP_CHECK_PROG],
610 [AC_CHECK_PROG([$1], [$2], [$as_dir/$ac_word$ac_exec_ext], [$3], [$4], [$5])][]dnl
616 # Find a non-WinDoze version of the "find" utility.
617 AC_DEFUN([FP_PROG_FIND],
618 [AC_PATH_PROG([fp_prog_find], [find])
619 echo foo > conftest.txt
620 $fp_prog_find conftest.txt -print > conftest.out 2>&1
621 if grep '^conftest.txt$' conftest.out > /dev/null 2>&1 ; then
622 # OK, looks like a real "find".
623 FindCmd="$fp_prog_find"
625 # Found a poor WinDoze version of "find", ignore it.
626 AC_MSG_WARN([$fp_prog_find looks like a non-*nix find, ignoring it])
627 FP_CHECK_PROG([FindCmd], [find], [], [], [$fp_prog_find])
629 rm -f conftest.txt conftest.out
630 AC_SUBST([FindCmd])[]dnl
635 dnl FPTOOLS_NOCACHE_CHECK prints a message, then sets the
636 dnl values of the second argument to the result of running
637 dnl the commands given by the third. It does not cache its
638 dnl result, so it is suitable for checks which should be
641 AC_DEFUN(FPTOOLS_NOCACHE_CHECK,
642 [AC_MSG_CHECKING([$1])
644 AC_MSG_RESULT([$][$2])
648 dnl FPTOOLS_GHC_VERSION(version)
649 dnl FPTOOLS_GHC_VERSION(major, minor [, patchlevel])
650 dnl FPTOOLS_GHC_VERSION(version, major, minor, patchlevel)
652 dnl Test for version of installed ghc. Uses $GHC.
653 dnl [original version pinched from c2hs]
655 AC_DEFUN(FPTOOLS_GHC_VERSION,
656 [FPTOOLS_NOCACHE_CHECK([version of ghc], [fptools_version_of_ghc],
657 ["${WithGhc-ghc}" --version > conftestghc 2>&1
658 cat conftestghc >&AS_MESSAGE_LOG_FD
659 #Useless Use Of cat award...
660 fptools_version_of_ghc=`cat conftestghc | sed -n -e 's/, patchlevel *\([[0-9]]\)/.\1/;s/.* version \([[0-9]][[0-9.]]*\).*/\1/p'`
662 if test "[$]fptools_version_of_ghc" = ""
664 fptools_version_of_ghc='unknown'
666 fptools_version_of_ghc[_major]=`echo [$]fptools_version_of_ghc | sed -e 's/^\([[0-9]]\).*/\1/'`
667 fptools_version_of_ghc[_minor]=`echo [$]fptools_version_of_ghc | sed -e 's/^[[0-9]]\.\([[0-9]]*\).*/\1/'`
668 fptools_version_of_ghc[_pl]=`echo [$]fptools_version_of_ghc | sed -n -e 's/^[[0-9]]\.[[0-9]]*\.\([[0-9]]*\)/\1/p'`
670 if test "[$]fptools_version_of_ghc[_pl]" = ""
672 fptools_version_of_ghc[_all]="[$]fptools_version_of_ghc[_major].[$]fptools_version_of_ghc[_minor]"
673 fptools_version_of_ghc[_pl]="0"
675 fptools_version_of_ghc[_all]="[$]fptools_version_of_ghc[_major].[$]fptools_version_of_ghc[_minor].[$]fptools_version_of_ghc[_pl]"
679 [$1]="[$]fptools_version_of_ghc[_all]"
681 [$1]="[$]fptools_version_of_ghc[_major]"
682 [$2]="[$]fptools_version_of_ghc[_minor]"
684 [$1]="[$]fptools_version_of_ghc[_major]"
685 [$2]="[$]fptools_version_of_ghc[_minor]"
686 [$3]="[$]fptools_version_of_ghc[_pl]"
688 [$1]="[$]fptools_version_of_ghc[_all]"
689 [$2]="[$]fptools_version_of_ghc[_major]"
690 [$3]="[$]fptools_version_of_ghc[_minor]"
691 [$4]="[$]fptools_version_of_ghc[_pl]"
697 dnl ** Map an arithmetic C type to a Haskell type.
698 dnl Based on autconf's AC_CHECK_SIZEOF.
700 dnl FPTOOLS_CHECK_HTYPE(TYPE [, DEFAULT_VALUE, [, VALUE-FOR-CROSS-COMPILATION])
701 AC_DEFUN(FPTOOLS_CHECK_HTYPE,
702 [changequote(<<, >>)dnl
703 dnl The name to #define.
704 define(<<AC_TYPE_NAME>>, translit(htype_$1, [a-z *], [A-Z_P]))dnl
705 dnl The cache variable name.
706 define(<<AC_CV_NAME>>, translit(fptools_cv_htype_$1, [ *], [_p]))dnl
707 define(<<AC_CV_NAME_supported>>, translit(fptools_cv_htype_sup_$1, [ *], [_p]))dnl
709 AC_MSG_CHECKING(Haskell type for $1)
710 AC_CACHE_VAL(AC_CV_NAME,
711 [AC_CV_NAME_supported=yes
712 fp_check_htype_save_cppflags="$CPPFLAGS"
713 CPPFLAGS="$CPPFLAGS $X_CFLAGS"
714 AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
718 # include <sys/types.h>
726 # include <sys/stat.h>
742 # include <termios.h>
753 #if defined(HAVE_GL_GL_H)
755 #elif defined(HAVE_OPENGL_GL_H)
756 # include <OpenGL/gl.h>
759 #if defined(HAVE_AL_ALC_H)
761 #elif defined(HAVE_OPENAL_ALC_H)
762 # include <OpenAL/alc.h>
765 #if HAVE_SYS_RESOURCE_H
766 # include <sys/resource.h>
772 FILE *f=fopen("conftestval", "w");
774 if (((testing)((int)((testing)1.4))) == ((testing)1.4)) {
776 ((testing)(-1) < (testing)0) ? "Int" : "Word",
780 (sizeof(testing) > sizeof(double)) ? "LDouble" :
781 (sizeof(testing) == sizeof(double)) ? "Double" : "Float");
785 }]])],[AC_CV_NAME=`cat conftestval`],
786 [ifelse([$2], , [AC_CV_NAME=NotReallyAType; AC_CV_NAME_supported=no], [AC_CV_NAME=$2])],
787 [ifelse([$3], , [AC_CV_NAME=NotReallyATypeCross; AC_CV_NAME_supported=no], [AC_CV_NAME=$3])])]) dnl
788 CPPFLAGS="$fp_check_htype_save_cppflags"
789 if test "$AC_CV_NAME_supported" = yes; then
790 AC_MSG_RESULT($AC_CV_NAME)
791 AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [Define to Haskell type for $1])
793 AC_MSG_RESULT([not supported])
795 undefine([AC_TYPE_NAME])dnl
796 undefine([AC_CV_NAME])dnl
797 undefine([AC_CV_NAME_supported])dnl
801 # FP_CHECK_FUNC(FUNCTION, PROLOGUE, BODY, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
802 # ---------------------------------------------------------------------------------
803 # A variant of AC_CHECK_FUNCS, limited to a single FUNCTION, but with the
804 # additional flexibility of specifying the PROLOGUE and BODY.
805 AC_DEFUN([FP_CHECK_FUNC],
806 [AS_VAR_PUSHDEF([fp_func], [fp_cv_func_$1])dnl
807 AC_CACHE_CHECK([for $1], fp_func,
808 [AC_LINK_IFELSE([AC_LANG_PROGRAM([$2], [$3])],
809 [AS_VAR_SET(fp_func, yes)],
810 [AS_VAR_SET(fp_func, no)])])
811 AS_IF([test AS_VAR_GET(fp_func) = yes],
812 [AC_DEFINE(AS_TR_CPP(HAVE_$1), [1],
813 [Define to 1 if you have the `]$1[' function.]) $4],
815 AS_VAR_POPDEF([fp_func])dnl
821 # Generates a DocBook XML V4.2 document in conftest.xml.
822 AC_DEFUN([FP_GEN_DOCBOOK_XML],
824 cat > conftest.xml << EOF
825 <?xml version="1.0" encoding="iso-8859-1"?>
826 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
827 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
829 <title>A DocBook Test Document</title>
830 <chapter id="id-one">
831 <title>A Chapter Title</title>
832 <para>This is a paragraph, referencing <xref linkend="id-two"/>.</para>
834 <chapter id="id-two">
835 <title>Another Chapter Title</title>
836 <para>This is another paragraph, referencing <xref linkend="id-one"/>.</para>
840 ]) # FP_GEN_DOCBOOK_XML
845 # Sets the output variable XsltprocCmd to the full path of the XSLT processor
846 # xsltproc. XsltprocCmd is empty if xsltproc could not be found.
847 AC_DEFUN([FP_PROG_XSLTPROC],
848 [AC_PATH_PROG([XsltprocCmd], [xsltproc])
849 if test -z "$XsltprocCmd"; then
850 AC_MSG_WARN([cannot find xsltproc in your PATH, you will not be able to build the documentation])
855 # FP_DIR_DOCBOOK_XSL(XSL-DIRS)
856 # ----------------------------
857 # Check which of the directories XSL-DIRS contains DocBook XSL stylesheets. The
858 # output variable DIR_DOCBOOK_XSL will contain the first usable directory or
859 # will be empty if none could be found.
860 AC_DEFUN([FP_DIR_DOCBOOK_XSL],
861 [AC_REQUIRE([FP_PROG_XSLTPROC])dnl
862 if test -n "$XsltprocCmd"; then
863 AC_CACHE_CHECK([for DocBook XSL stylesheet directory], fp_cv_dir_docbook_xsl,
865 fp_cv_dir_docbook_xsl=no
867 if $XsltprocCmd ${fp_var}/html/docbook.xsl conftest.xml > /dev/null 2>&1; then
868 fp_cv_dir_docbook_xsl=$fp_var
874 if test x"$fp_cv_dir_docbook_xsl" = xno; then
875 AC_MSG_WARN([cannot find DocBook XSL stylesheets, you will not be able to build the documentation])
878 DIR_DOCBOOK_XSL=$fp_cv_dir_docbook_xsl
880 AC_SUBST([DIR_DOCBOOK_XSL])
881 ])# FP_DIR_DOCBOOK_XSL
886 # Sets the output variable XmllintCmd to the full path of the XSLT processor
887 # xmllint. XmllintCmd is empty if xmllint could not be found.
888 AC_DEFUN([FP_PROG_XMLLINT],
889 [AC_PATH_PROG([XmllintCmd], [xmllint])
890 if test -z "$XmllintCmd"; then
891 AC_MSG_WARN([cannot find xmllint in your PATH, you will not be able to validate your documentation])
896 # FP_CHECK_DOCBOOK_DTD
897 # --------------------
898 AC_DEFUN([FP_CHECK_DOCBOOK_DTD],
899 [AC_REQUIRE([FP_PROG_XMLLINT])dnl
900 if test -n "$XmllintCmd"; then
901 AC_MSG_CHECKING([for DocBook DTD])
903 if $XmllintCmd --valid --noout conftest.xml > /dev/null 2>&1; then
906 AC_MSG_RESULT([failed])
907 AC_MSG_WARN([cannot find a DTD for DocBook XML V4.2, you will not be able to validate your documentation])
908 AC_MSG_WARN([check your XML_CATALOG_FILES environment variable and/or /etc/xml/catalog])
912 ])# FP_CHECK_DOCBOOK_DTD
917 # Generates a formatting objects document in conftest.fo.
918 AC_DEFUN([FP_GEN_FO],
920 cat > conftest.fo << EOF
921 <?xml version="1.0"?>
922 <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
923 <fo:layout-master-set>
924 <fo:simple-page-master master-name="blank">
926 </fo:simple-page-master>
927 </fo:layout-master-set>
928 <fo:page-sequence master-reference="blank">
929 <fo:flow flow-name="xsl-region-body">
942 # Set the output variable 'FopCmd' to the first working 'fop' in the current
943 # 'PATH'. Note that /usr/bin/fop is broken in SuSE 9.1 (unpatched), so try
944 # /usr/share/fop/fop.sh in that case (or no 'fop'), too.
945 AC_DEFUN([FP_PROG_FOP],
946 [AC_PATH_PROGS([FopCmd1], [fop])
947 if test -n "$FopCmd1"; then
948 AC_CACHE_CHECK([for $FopCmd1 usability], [fp_cv_fop_usability],
950 if "$FopCmd1" -fo conftest.fo -ps conftest.ps > /dev/null 2>&1; then
951 fp_cv_fop_usability=yes
953 fp_cv_fop_usability=no
956 if test x"$fp_cv_fop_usability" = xyes; then
960 if test -z "$FopCmd"; then
961 AC_PATH_PROGS([FopCmd2], [fop.sh], , [/usr/share/fop])
968 # FP_PROG_FO_PROCESSOR
969 # --------------------
970 # Try to find an FO processor. PassiveTeX output is sometimes a bit strange, so
971 # try FOP first. Sets the output variables FopCmd, XmltexCmd, DvipsCmd, and
973 AC_DEFUN([FP_PROG_FO_PROCESSOR],
974 [AC_REQUIRE([FP_PROG_FOP])
975 AC_PATH_PROG([XmltexCmd], [xmltex])
976 AC_PATH_PROG([DvipsCmd], [dvips])
977 if test -z "$FopCmd"; then
978 if test -z "$XmltexCmd"; then
979 AC_MSG_WARN([cannot find an FO => DVI converter, you will not be able to build DVI or PostScript documentation])
981 if test -z "$DvipsCmd"; then
982 AC_MSG_WARN([cannot find a DVI => PS converter, you will not be able to build PostScript documentation])
985 AC_PATH_PROG([PdfxmltexCmd], [pdfxmltex])
986 if test -z "$PdfxmltexCmd"; then
987 AC_MSG_WARN([cannot find an FO => PDF converter, you will not be able to build PDF documentation])
989 elif test -z "$XmltexCmd"; then
990 AC_MSG_WARN([cannot find an FO => DVI converter, you will not be able to build DVI documentation])
992 ])# FP_PROG_FO_PROCESSOR
997 # Try to find a ghc-pkg matching the ghc mentioned in the environment variable
998 # WithGhc. If the latter is unset or no matching ghc-pkg can be found, try to
999 # find a plain ghc-pkg. Sets the output variable GhcPkgCmd.
1000 AC_DEFUN([FP_PROG_GHC_PKG],
1001 [AC_CACHE_CHECK([for ghc-pkg matching $WithGhc], fp_cv_matching_ghc_pkg,
1002 [fp_ghc_pkg_guess=`echo $WithGhc | sed 's,ghc\(@<:@^/\\@:>@*\)$,ghc-pkg\1,'`
1003 if "$fp_ghc_pkg_guess" -l > /dev/null 2>&1; then
1004 fp_cv_matching_ghc_pkg=$fp_ghc_pkg_guess
1006 fp_cv_matching_ghc_pkg=no
1008 if test x"$fp_cv_matching_ghc_pkg" = xno; then
1009 AC_PATH_PROG([GhcPkgCmd], [ghc-pkg])
1011 GhcPkgCmd=$fp_cv_matching_ghc_pkg
1012 fi])# FP_PROG_GHC_PKG
1017 # If Windows is the target platform (e.g. MinGW/MSYS or Cygwin with
1018 # -mno-cygwin), the variable "is_win32" is set to "yes", otherwise (e.g. *nix
1019 # systems or plain Cygwin) it is set to "no".
1020 AC_DEFUN([FP_CHECK_WIN32],
1021 [AC_CACHE_CHECK([for Windows environment], [fp_cv_is_win32],
1022 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
1026 ])], [fp_cv_is_win32=yes], [fp_cv_is_win32=no])])
1027 is_win32="$fp_cv_is_win32"[]dnl
1033 # Same as AC_PATH_X, but works even for broken Cygwins which try to include the
1034 # non-existant <gl/mesa_wgl.h> header when -mno-cygwin is used.
1035 AC_DEFUN([FP_PATH_X],
1036 [AC_REQUIRE([FP_CHECK_WIN32])
1037 if test x"$is_win32" = xyes; then
1047 # Same as AC_PATH_XTRA, but works even for broken Cygwins which try to include
1048 # the non-existant <gl/mesa_wgl.h> header when -mno-cygwin is used.
1049 AC_DEFUN([FP_PATH_XTRA],
1050 [AC_REQUIRE([FP_CHECK_WIN32])
1051 if test x"$is_win32" = xyes; then
1059 # FP_CHECK_GL_HELPER(LIBNAME, LIBS, INCLUDES, FUNCTION-BODY)
1060 # ----------------------------------------------------------
1061 # Try each library in LIBS to successfully link INCLUDES plus FUNCTION-BODY,
1062 # setting LIBNAME_CFLAGS and LIBNAME_LIBS to the corresponding values. Sets
1063 # no_LIBNAME to "yes" if no suitable library was found. (LIBNAME_CFLAGS0
1064 # contains the value of LIBNAME_CFLAGS without CPPFLAGS, and LIBNAME_LIBS0
1065 # contains the value of LIBNAME_LIBS without LDFLAGS, but these are only
1067 AC_DEFUN([FP_CHECK_GL_HELPER],
1068 [AC_CACHE_CHECK([for $1 library], [fp_cv_check_$1_lib],
1069 [fp_cv_check_$1_lib="no"
1070 fp_save_CPPFLAGS="$CPPFLAGS"
1071 CPPFLAGS="$CPPFLAGS ${$1_CFLAGS}"
1072 fp_save_LIBS="$LIBS"
1073 for fp_try_lib in $2; do
1074 # transform "-lfoo" to "foo.lib" when using cl
1075 if test x"$CC" = xcl; then
1076 fp_try_lib=`echo $fp_try_lib | sed -e 's/^-l//' -e 's/$/.lib/'`
1078 LIBS="$fp_try_lib ${$1_LIBS} $fp_save_LIBS"
1079 AC_LINK_IFELSE([AC_LANG_PROGRAM([$3], [$4])], [fp_cv_check_$1_lib="$fp_try_lib ${$1_LIBS}"; break])
1081 LIBS="$fp_save_LIBS"
1082 CPPFLAGS="$fp_save_CPPFLAGS"])
1084 if test x"$fp_cv_check_$1_lib" = xno; then
1089 $1_CFLAGS0="${$1_CFLAGS}"
1090 $1_CFLAGS="$CPPFLAGS ${$1_CFLAGS0}"
1091 $1_LIBS0="$fp_cv_check_$1_lib"
1092 $1_LIBS="$LDFLAGS ${$1_LIBS0}"
1094 ])# FP_CHECK_GL_HELPER
1099 AC_DEFUN([FP_CHECK_GL],
1100 [AC_REQUIRE([FP_PATH_X])
1101 AC_REQUIRE([AC_CANONICAL_TARGET])
1103 AC_ARG_ENABLE([hopengl],
1104 [AC_HELP_STRING([--enable-hopengl],
1105 [build a Haskell binding for OpenGL (GL/GLU). On Mac OS X, use
1106 --enable-hopengl=x11 to use X11 instead of the "native" libraries.
1108 [enable_opengl=$enableval], [enable_opengl=no])
1110 if test x"$enable_opengl" = xno; then
1113 use_quartz_opengl=no
1116 if test x"$enable_opengl" != xx11; then
1117 AC_DEFINE([USE_QUARTZ_OPENGL], [1],
1118 [Define to 1 if native OpenGL should be used on Mac OS X])
1119 use_quartz_opengl=yes
1124 if test x"$use_quartz_opengl" != xyes; then
1125 AC_CHECK_LIB([m], [atan], [GL_LIBS="-lm $GL_LIBS"])
1127 if test x"$no_x" != xyes; then
1128 test -n "$x_includes" && GL_CFLAGS="-I$x_includes $GL_CFLAGS"
1129 test -n "$x_libraries" && GL_LIBS="-L$x_libraries -lX11 $GL_LIBS"
1132 FP_CHECK_GL_HELPER([GL], [-lGL -lopengl32], [@%:@include <GL/gl.h>], [glEnd()])
1134 if test x"$no_GL" != xyes; then
1135 # Ugly: To get wglGetProcAddress on Windows, we have to link with
1136 # opengl32.dll, too, even when we are using Cygwin with X11.
1138 *-lopengl32*|*opengl32.lib*) ;;
1139 *) fp_save_LIBS="$LIBS"
1140 LIBS="$LIBS -lopengl32"
1141 AC_LINK_IFELSE([AC_LANG_PROGRAM([[@%:@include <GL/gl.h>]], [[glEnd()]])],
1142 [GL_LIBS="$GL_LIBS -lopengl32"; GL_LIBS0="$GL_LIBS0 -lopengl32"])
1143 LIBS="$fp_save_LIBS"
1150 AC_SUBST([GL_CFLAGS])
1157 AC_DEFUN([FP_CHECK_GLU],
1158 [AC_REQUIRE([FP_CHECK_GL])dnl
1159 GLU_CFLAGS="$GL_CFLAGS0"
1160 GLU_LIBS="$GL_LIBS0"
1162 if test x"$enable_opengl" = xno; then
1164 elif test x"$use_quartz_opengl" != xyes; then
1165 FP_CHECK_GL_HELPER([GLU], [-lglu32 -lGLU], [@%:@include <GL/glu.h>], [gluNewQuadric()])
1168 AC_SUBST([GLU_CFLAGS])
1169 AC_SUBST([GLU_LIBS])
1175 AC_DEFUN([FP_CHECK_GLUT],
1176 [AC_REQUIRE([FP_CHECK_GLU])
1179 if test x"$enable_opengl" = xno; then
1181 elif test x"$use_quartz_opengl" != xyes; then
1182 GLUT_CFLAGS="$GLU_CFLAGS0"
1183 GLUT_LIBS="$GLU_LIBS0"
1185 if test x"$no_x" != xyes; then
1186 GLUT_LIBS="$X_PRE_LIBS -lXmu -lXi $X_EXTRA_LIBS $GLUT_LIBS"
1189 AC_CHECK_HEADERS([windows.h GL/glut.h])
1190 # Note 1: On Cygwin with X11, GL/GLU functions use the "normal" calling
1191 # convention, but GLUT functions use stdcall. To get this right, it is
1192 # necessary to include <windows.h> first.
1193 # Note 2: MinGW/MSYS comes without a GLUT header, so we use Cygwin's one in
1195 FP_CHECK_GL_HELPER([GLUT], [-lglut32 -lglut], [
1197 #include <windows.h>
1200 #include <GL/glut.h>
1202 #include "glut_local.h"
1204 ], [glutMainLoop()])
1207 AC_SUBST([GLUT_CFLAGS])
1208 AC_SUBST([GLUT_LIBS])
1214 # Define output variable SUPPORTS_EMPTY_STRUCTS if empty structs are accepted by
1217 AC_DEFUN(FP_EMPTY_STRUCTS,
1218 [AC_CACHE_CHECK(empty struct support, fp_cv_empty_structs,
1219 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[typedef struct { /* empty */ } StgFoo;]],
1221 [fp_cv_empty_structs=yes],
1222 [fp_cv_empty_structs=no])])
1223 if test x"$fp_cv_empty_structs" = xyes; then
1224 AC_DEFINE([SUPPORTS_EMPTY_STRUCTS], [1], [Define to 1 if C compiler supports declaration of empty structure types.])