dnl MPFR specific autoconf macros dnl Copyright 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. dnl Contributed by the Arenaire and Cacao projects, INRIA. dnl dnl This file is part of the MPFR Library. dnl dnl The MPFR Library is free software; you can redistribute it and/or modify dnl it under the terms of the GNU Lesser General Public License as published dnl by the Free Software Foundation; either version 2.1 of the License, or (at dnl your option) any later version. dnl dnl The MPFR Library is distributed in the hope that it will be useful, but dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public dnl License for more details. dnl dnl You should have received a copy of the GNU Lesser General Public License dnl along with the MPFR Library; see the file COPYING.LIB. If not, write to dnl the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, dnl MA 02110-1301, USA. dnl autoconf 2.50 is necessary because of the use of AH_VERBATIM, dnl but it would be better to make the config file compatible with dnl both autoconf 2.13 and autoconf 2.50. dnl The following line allows the autoconf wrapper (when installed) dnl to work as expected. AC_PREREQ(2.50) dnl ------------------------------------------------------------ dnl You must put in MPFR_CONFIGS everything which configure MPFR dnl except: dnl -everything dealing with CC and CFLAGS in particular the ABI dnl but the IEEE-754 specific flags must be set here. dnl -GMP's linkage. dnl -Libtool stuff. dnl -Handling of special arguments of MPFR's configure. AC_DEFUN([MPFR_CONFIGS], [ AC_REQUIRE([AC_OBJEXT]) AC_REQUIRE([MPFR_CHECK_LIBM]) AC_REQUIRE([AC_HEADER_TIME]) AC_REQUIRE([AC_CANONICAL_HOST]) AC_CHECK_HEADER([limits.h],, AC_MSG_ERROR([limits.h not found])) AC_CHECK_HEADER([float.h],, AC_MSG_ERROR([float.h not found])) AC_CHECK_HEADER([string.h],, AC_MSG_ERROR([string.h not found])) dnl Check for locales AC_CHECK_HEADERS([locale.h]) dnl Check for wide characters (wchar_t and wint_t) AC_CHECK_HEADERS([wchar.h]) dnl Check for stdargs AC_CHECK_HEADER([stdarg.h],[AC_DEFINE([HAVE_STDARG],1,[Define if stdarg])], [AC_CHECK_HEADER([varargs.h],, AC_MSG_ERROR([stdarg.h or varargs.h not found]))]) dnl sys/fpu.h - MIPS specific AC_CHECK_HEADERS([sys/time.h sys/fpu.h]) dnl FIXME: The functions memmove, memset and strtol are really needed by dnl MPFR, but if they are implemented as macros, this is also OK (in our dnl case). So, we do not return an error, but their tests are currently dnl useless. dnl gettimeofday is not defined for MinGW AC_CHECK_FUNCS([memmove memset setlocale strtol gettimeofday]) dnl Check for IEEE-754 switches on Alpha case $host in alpha*-*-*) saved_CFLAGS="$CFLAGS" AC_CACHE_CHECK([for IEEE-754 switches], mpfr_cv_ieee_switches, [ if test -n "$GCC"; then mpfr_cv_ieee_switches="-mfp-rounding-mode=d -mieee-with-inexact" else mpfr_cv_ieee_switches="-fprm d -ieee_with_inexact" fi CFLAGS="$CFLAGS $mpfr_cv_ieee_switches" AC_TRY_COMPILE(,,, mpfr_cv_ieee_switches="none") ]) if test "$mpfr_cv_ieee_switches" = "none"; then CFLAGS="$saved_CFLAGS" else CFLAGS="$saved_CFLAGS $mpfr_cv_ieee_switches" fi esac dnl Check for Core2 processor case $host in x86_64-*linux*) case `sed -n '/^vendor_id/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in *Intel*) AC_DEFINE(HAVE_HOST_CORE2,1,[Define if processor is Core 2]) ;; esac esac AC_CHECK_TYPE( [union fpc_csr], AC_DEFINE(HAVE_FPC_CSR,1,[Define if union fpc_csr is available]), , [ #if HAVE_SYS_FPU_H # include #endif ]) dnl Check for fesetround AC_CACHE_CHECK([for fesetround], mpfr_cv_have_fesetround, [ saved_LIBS="$LIBS" LIBS="$LIBS $MPFR_LIBM" AC_TRY_LINK([#include ], [fesetround(FE_TONEAREST);], mpfr_cv_have_fesetround=yes, mpfr_cv_have_fesetround=no) LIBS="$saved_LIBS" ]) if test "$mpfr_cv_have_fesetround" = "yes"; then AC_DEFINE(MPFR_HAVE_FESETROUND,1,[Define if you have the `fesetround' function via the header file.]) fi dnl Check for gcc float-conversion bug; if need be, -ffloat-store is used to dnl force the conversion to the destination type when a value is stored to dnl a variable (see ISO C99 standard 5.1.2.3#13, 6.3.1.5#2, 6.3.1.8#2). This dnl is important concerning the exponent range. Note that this doesn't solve dnl the double-rounding problem. if test -n "$GCC"; then AC_CACHE_CHECK([for gcc float-conversion bug], mpfr_cv_gcc_floatconv_bug, [ saved_LIBS="$LIBS" LIBS="$LIBS $MPFR_LIBM" AC_TRY_RUN([ #include #ifdef MPFR_HAVE_FESETROUND #include #endif static double get_max (void); int main() { double x = 0.5; int i; for (i = 1; i <= 11; i++) x *= x; if (x != 0) return 1; #ifdef MPFR_HAVE_FESETROUND /* Useful test for the G4 PowerPC */ fesetround(FE_TOWARDZERO); x = get_max (); x *= 2.0; if (x != get_max ()) return 1; #endif return 0; } static double get_max (void) { return DBL_MAX; } ], [mpfr_cv_gcc_floatconv_bug="no"], [mpfr_cv_gcc_floatconv_bug="yes, use -ffloat-store"], [mpfr_cv_gcc_floatconv_bug="cannot test, use -ffloat-store"]) LIBS="$saved_LIBS" ]) if test "$mpfr_cv_gcc_floatconv_bug" != "no"; then CFLAGS="$CFLAGS -ffloat-store" fi fi dnl Check if denormalized numbers are supported AC_CACHE_CHECK([for denormalized numbers], mpfr_cv_have_denorms, [ AC_TRY_RUN([ #include #include int main() { double x = 2.22507385850720138309e-308; fprintf (stderr, "%e\n", x / 2.0); return 2.0 * (x / 2.0) != x; } ], mpfr_cv_have_denorms=yes, mpfr_cv_have_denorms=no, mpfr_cv_have_denorms=no) ]) if test "$mpfr_cv_have_denorms" = "yes"; then AC_DEFINE(HAVE_DENORMS,1,[Define if denormalized floats work.]) fi dnl Check whether NAN != NAN (as required by the IEEE-754 standard, dnl but not by the ISO C standard). For instance, this is false with dnl MIPSpro 7.3.1.3m under IRIX64. By default, assume this is true. AC_CACHE_CHECK([if NAN == NAN], mpfr_cv_nanisnan, [ AC_TRY_RUN([ #include #include #ifndef NAN # define NAN (0.0/0.0) #endif int main() { double d; d = NAN; return d != d; } ], [mpfr_cv_nanisnan="yes"], [mpfr_cv_nanisnan="no"], [mpfr_cv_nanisnan="cannot test, assume no"]) ]) if test "$mpfr_cv_nanisnan" = "yes"; then AC_DEFINE(MPFR_NANISNAN,1,[Define if NAN == NAN.]) fi dnl Check if the chars '0' to '9' are consecutive values AC_MSG_CHECKING([if charset has consecutive values]) AC_RUN_IFELSE(AC_LANG_PROGRAM([[ char *number = "0123456789"; char *lower = "abcdefghijklmnopqrstuvwxyz"; char *upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; ]],[[ int i; unsigned char *p; for (p = (unsigned char*) number, i = 0; i < 9; i++) if ( (*p)+1 != *(p+1) ) return 1; for (p = (unsigned char*) lower, i = 0; i < 25; i++) if ( (*p)+1 != *(p+1) ) return 1; for (p = (unsigned char*) upper, i = 0; i < 25; i++) if ( (*p)+1 != *(p+1) ) return 1; ]]), [AC_MSG_RESULT(yes)],[ AC_MSG_RESULT(no) AC_DEFINE(MPFR_NO_CONSECUTIVE_CHARSET,1,[Charset is not consecutive]) ], [AC_MSG_RESULT(can not test)]) dnl Must be checked with the LIBM dnl but we don't want to add the LIBM to MPFR dependency. dnl Can't use AC_CHECK_FUNCS since the function may be in LIBM but dnl not exported in math.h saved_LIBS="$LIBS" LIBS="$LIBS $MPFR_LIBM" dnl AC_CHECK_FUNCS([round trunc floor ceil nearbyint]) AC_MSG_CHECKING(for math/round) AC_LINK_IFELSE([AC_LANG_PROGRAM([[ #include int f (double (*func)(double)) { return 0;} ]], [[ double a = 17.42; a = f (round); return 0; ]])], [ AC_MSG_RESULT(yes) AC_DEFINE(HAVE_ROUND, 1,[Have ISO-C99 round function]) ],[AC_MSG_RESULT(no)]) AC_MSG_CHECKING(for math/trunc) AC_LINK_IFELSE([AC_LANG_PROGRAM([[ #include int f (double (*func)(double)) { return 0;} ]], [[ double a = 17.42; a = f(trunc); return 0; ]])], [ AC_MSG_RESULT(yes) AC_DEFINE(HAVE_TRUNC, 1,[Have ISO-C99 trunc function]) ],[AC_MSG_RESULT(no)]) AC_MSG_CHECKING(for math/floor) AC_LINK_IFELSE([AC_LANG_PROGRAM([[ #include int f (double (*func)(double)) { return 0;} ]], [[ double a = 17.42; a = f(floor); return 0; ]])], [ AC_MSG_RESULT(yes) AC_DEFINE(HAVE_FLOOR, 1,[Have ISO-C99 floor function]) ],[AC_MSG_RESULT(no)]) AC_MSG_CHECKING(for math/ceil) AC_LINK_IFELSE([AC_LANG_PROGRAM([[ #include int f (double (*func)(double)) { return 0;} ]], [[ double a = 17.42; a = f(ceil); return 0; ]])], [ AC_MSG_RESULT(yes) AC_DEFINE(HAVE_CEIL, 1,[Have ISO-C99 ceil function]) ],[AC_MSG_RESULT(no)]) AC_MSG_CHECKING(for math/rint) AC_LINK_IFELSE([AC_LANG_PROGRAM([[ #include int f (double (*func)(double)) { return 0;} ]], [[ double a = 17.42; a = f(nearbyint); return 0; ]])], [ AC_MSG_RESULT(yes) AC_DEFINE(HAVE_NEARBYINT, 1,[Have ISO-C99 rint function]) ],[AC_MSG_RESULT(no)]) LIBS="$saved_LIBS" dnl Now try to check the long double format MPFR_C_LONG_DOUBLE_FORMAT dnl Check if thread-local variables are supported. dnl At least two problems can occur in practice: dnl 1. The compilation fails, e.g. because the compiler doesn't know dnl about the __thread keyword. dnl 2. The compilation succeeds, but the system doesn't support TLS or dnl there is some ld configuration problem. One of the effects can dnl be that thread-local variables always evaluate to 0. So, it is dnl important to run the test below. if test "$enable_thread_safe" = yes; then AC_CACHE_CHECK([for TLS support], mpfr_cv_working_tls, [ AC_RUN_IFELSE([ #define MPFR_USE_THREAD_SAFE 1 #include "mpfr-thread.h" MPFR_THREAD_ATTR int x = 17; int main() { return x != 17; } ], [mpfr_cv_working_tls="yes"], [AC_MSG_RESULT(no) AC_MSG_ERROR([please configure with --disable-thread-safe])], [mpfr_cv_working_tls="cannot test, assume yes"]) ]) fi ]) dnl MPFR_C_LONG_DOUBLE_FORMAT dnl ------------------------- dnl Determine the format of a long double. dnl dnl The object file is grepped, so as to work when cross compiling. A dnl start and end sequence is included to avoid false matches, and dnl allowance is made for the desired data crossing an "od -b" line dnl boundary. The test number is a small integer so it should appear dnl exactly, no rounding or truncation etc. dnl dnl "od -b" is supported even by Unix V7, and the awk script used doesn't dnl have functions or anything, so even an "old" awk should suffice. dnl dnl The 10-byte IEEE extended format is generally padded to either 12 or 16 dnl bytes for alignment purposes. The SVR4 i386 ABI is 12 bytes, or i386 dnl gcc -m128bit-long-double selects 16 bytes. IA-64 is 16 bytes in LP64 dnl mode, or 12 bytes in ILP32 mode. The first 10 bytes is the relevant dnl part in all cases (big and little endian). dnl dnl Enhancements: dnl dnl Could match more formats, but no need to worry until there's code dnl wanting to use them. dnl dnl Don't want to duplicate the double matching from GMP_C_DOUBLE_FORMAT, dnl perhaps we should merge with that macro, to match data formats dnl irrespective of the C type in question. Or perhaps just let the code dnl use DOUBLE macros when sizeof(double)==sizeof(long double). AC_DEFUN([MPFR_C_LONG_DOUBLE_FORMAT], [AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_PROG_AWK]) AC_REQUIRE([AC_OBJEXT]) AC_CHECK_TYPES([long double]) AC_CACHE_CHECK([format of `long double' floating point], mpfr_cv_c_long_double_format, [mpfr_cv_c_long_double_format=unknown if test "$ac_cv_type_long_double" != yes; then mpfr_cv_c_long_double_format="not available" else cat >conftest.c <<\EOF [ /* "before" is 16 bytes to ensure there's no padding between it and "x". We're not expecting any "long double" bigger than 16 bytes or with alignment requirements stricter than 16 bytes. */ struct { char before[16]; long double x; char after[8]; } foo = { { '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\001', '\043', '\105', '\147', '\211', '\253', '\315', '\357' }, -123456789.0, { '\376', '\334', '\272', '\230', '\166', '\124', '\062', '\020' } }; ] EOF mpfr_compile="$CC $CFLAGS $CPPFLAGS -c conftest.c >&AC_FD_CC 2>&1" if AC_TRY_EVAL(mpfr_compile); then cat >conftest.awk <<\EOF [ BEGIN { found = 0 } # got[] holds a sliding window of bytes read the input. got[0] is the most # recent byte read, and got[31] the oldest byte read, so when looking to # match some data the indices are "reversed". # { for (f = 2; f <= NF; f++) { # new byte, shift others up for (i = 31; i >= 0; i--) got[i+1] = got[i]; got[0] = $f; # end sequence if (got[7] != "376") continue if (got[6] != "334") continue if (got[5] != "272") continue if (got[4] != "230") continue if (got[3] != "166") continue if (got[2] != "124") continue if (got[1] != "062") continue if (got[0] != "020") continue # start sequence, with 12-byte body if (got[27] == "001" && \ got[26] == "043" && \ got[25] == "105" && \ got[24] == "147" && \ got[23] == "211" && \ got[22] == "253" && \ got[21] == "315" && \ got[20] == "357") { saw = " (" got[19] \ " " got[18] \ " " got[17] \ " " got[16] \ " " got[15] \ " " got[14] \ " " got[13] \ " " got[12] \ " " got[11] \ " " got[10] \ " " got[9] \ " " got[8] ")" if (got[19] == "000" && \ got[18] == "000" && \ got[17] == "000" && \ got[16] == "000" && \ got[15] == "240" && \ got[14] == "242" && \ got[13] == "171" && \ got[12] == "353" && \ got[11] == "031" && \ got[10] == "300") { print "IEEE extended, little endian" found = 1 exit } } # start sequence, with 16-byte body if (got[31] == "001" && \ got[30] == "043" && \ got[29] == "105" && \ got[28] == "147" && \ got[27] == "211" && \ got[26] == "253" && \ got[25] == "315" && \ got[24] == "357") { saw = " (" got[23] \ " " got[22] \ " " got[21] \ " " got[20] \ " " got[19] \ " " got[18] \ " " got[17] \ " " got[16] \ " " got[15] \ " " got[14] \ " " got[13] \ " " got[12] \ " " got[11] \ " " got[10] \ " " got[9] \ " " got[8] ")" if (got[23] == "000" && \ got[22] == "000" && \ got[21] == "000" && \ got[20] == "000" && \ got[19] == "240" && \ got[18] == "242" && \ got[17] == "171" && \ got[16] == "353" && \ got[15] == "031" && \ got[14] == "300") { print "IEEE extended, little endian" found = 1 exit } if (got[23] == "300" && \ got[22] == "031" && \ got[21] == "326" && \ got[20] == "363" && \ got[19] == "105" && \ got[18] == "100" && \ got[17] == "000" && \ got[16] == "000" && \ got[15] == "000" && \ got[14] == "000" && \ got[13] == "000" && \ got[12] == "000" && \ got[11] == "000" && \ got[10] == "000" && \ got[9] == "000" && \ got[8] == "000") { print "IEEE quad, big endian" found = 1 exit } } } } END { if (! found) print "unknown", saw } ] EOF mpfr_cv_c_long_double_format=`od -b conftest.$OBJEXT | $AWK -f conftest.awk` case $mpfr_cv_c_long_double_format in unknown*) echo "cannot match anything, conftest.$OBJEXT contains" >&AC_FD_CC od -b conftest.$OBJEXT >&AC_FD_CC ;; esac else AC_MSG_WARN([oops, cannot compile test program]) fi fi rm -f conftest* ]) AH_VERBATIM([HAVE_LDOUBLE], [/* Define one of the following to 1 for the format of a `long double'. If your format is not among these choices, or you don't know what it is, then leave all undefined. IEEE_EXT is the 10-byte IEEE extended precision format. IEEE_QUAD is the 16-byte IEEE quadruple precision format. LITTLE or BIG is the endianness. */ #undef HAVE_LDOUBLE_IEEE_EXT_LITTLE #undef HAVE_LDOUBLE_IEEE_QUAD_BIG]) case $mpfr_cv_c_long_double_format in "IEEE extended, little endian") AC_DEFINE(HAVE_LDOUBLE_IEEE_EXT_LITTLE, 1) ;; "IEEE quad, big endian") AC_DEFINE(HAVE_LDOUBLE_IEEE_QUAD_BIG, 1) ;; unknown* | "not available") ;; *) AC_MSG_WARN([oops, unrecognised float format: $mpfr_cv_c_long_double_format]) ;; esac ]) dnl MPFR_CHECK_LIBM dnl --------------- dnl Determine a math library -lm to use. AC_DEFUN([MPFR_CHECK_LIBM], [AC_REQUIRE([AC_CANONICAL_HOST]) AC_SUBST(MPFR_LIBM,'') case $host in *-*-beos* | *-*-cygwin* | *-*-pw32*) # According to libtool AC CHECK LIBM, these systems don't have libm ;; *-*-hpux*) # -lM means something subtly different to -lm, SVID style error handling # or something. FIXME: Why exactly do we want this? AC_CHECK_LIB(M, main, MPFR_LIBM="-lM") ;; *-*-solaris*) # On Solaris the math functions new in C99 are in -lm9x. # FIXME: Do we need -lm9x as well as -lm, or just instead of? AC_CHECK_LIB(m9x, main, MPFR_LIBM="-lm9x") AC_CHECK_LIB(m, main, MPFR_LIBM="$MPFR_LIBM -lm") ;; *-ncr-sysv4.3*) # FIXME: What does -lmw mean? Libtool AC CHECK LIBM does it this way. AC_CHECK_LIB(mw, _mwvalidcheckl, MPFR_LIBM="-lmw") AC_CHECK_LIB(m, main, MPFR_LIBM="$MPFR_LIBM -lm") ;; *) AC_CHECK_LIB(m, main, MPFR_LIBM="-lm") ;; esac ]) dnl MPFR_LD_SEARCH_PATHS_FIRST dnl -------------------------- AC_DEFUN([MPFR_LD_SEARCH_PATHS_FIRST], [case "$LD $LDFLAGS" in *-Wl,-search_paths_first*) ;; *) AC_MSG_CHECKING([if the compiler understands -Wl,-search_paths_first]) saved_LDFLAGS="$LDFLAGS" LDFLAGS="-Wl,-search_paths_first $LDFLAGS" AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])], [AC_MSG_RESULT(yes)], [AC_MSG_RESULT(no)] LDFLAGS="$saved_LDFLAGS") ;; esac ]) dnl GMP_C_ATTRIBUTE_MODE dnl -------------------- dnl Introduced in gcc 2.2, but perhaps not in all Apple derived versions. dnl Needed for mpfr-longlong.h; this is currently necessary for s390. dnl dnl TODO: Replace this with a cleaner type size detection, as this dnl solution only works with gcc and assumes CHAR_BIT == 8. Probably use dnl , and dnl as a fallback. AC_DEFUN([GMP_C_ATTRIBUTE_MODE], [AC_CACHE_CHECK([whether gcc __attribute__ ((mode (XX))) works], gmp_cv_c_attribute_mode, [AC_TRY_COMPILE([typedef int SItype __attribute__ ((mode (SI)));], , gmp_cv_c_attribute_mode=yes, gmp_cv_c_attribute_mode=no) ]) if test $gmp_cv_c_attribute_mode = yes; then AC_DEFINE(HAVE_ATTRIBUTE_MODE, 1, [Define to 1 if the compiler accepts gcc style __attribute__ ((mode (XX)))]) fi ])