kc3-lang/gnulib/m4/fenv-environment.m4
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Date : 2025-09-10T23:22:53
Remove support for IRIX. * all-modules: Update comments. * build-aux/install-reloc: Likewise. * build-aux/reloc-ldflags: Likewise. * gnulib-tool: Likewise. * gnulib-tool.py: Likewise. * gnulib-tool.sh: Likewise. * lib/aligned-malloc.h: Likewise. * lib/boot-time.c: Likewise. * lib/c32is-impl.h: Likewise. * lib/c32srtombs-state.c: Likewise. * lib/c32to-impl.h: Likewise. * lib/c32width.c: Likewise. * lib/errno.in.h: Likewise. * lib/euidaccess.c: Likewise. * lib/fbufmode.c: Likewise. * lib/fenv-except-state-get.c: Likewise. * lib/fenv-except-state-set.c: Likewise. * lib/fenv-except-tracking-clear.c: Likewise. * lib/fenv-except-tracking-set.c: Likewise. * lib/fenv-except-tracking-test.c: Likewise. * lib/fenv-except-trapping.c: Likewise. * lib/fenv-round.c: Likewise. * lib/fflush.c: Likewise. * lib/fileblocks.c: Likewise. * lib/forkpty.c: Likewise. * lib/fpending.c: Likewise. * lib/fpurge.c: Likewise. * lib/freadable.c: Likewise. * lib/freadahead.c: Likewise. * lib/freading.c: Likewise. * lib/freadptr.c: Likewise. * lib/freadseek.c: Likewise. * lib/fseeko.c: Likewise. * lib/fseterr.c: Likewise. * lib/fsusage.c: Likewise. * lib/fwritable.c: Likewise. * lib/fwriting.c: Likewise. * lib/getdomainname.c: Likewise. * lib/idpriv-drop.c: Likewise. * lib/idpriv-droptemp.c: Likewise. * lib/limits.in.h: Likewise. * lib/mbrtoc16.c: Likewise. * lib/mbrtoc32.c: Likewise. * lib/mbsrtoc32s-state.c: Likewise. * lib/mbsrtowcs-state.c: Likewise. * lib/mbtowc-lock.h: Likewise. * lib/minmax.h: Likewise. * lib/netdb.in.h: Likewise. * lib/pipe-filter-ii.c: Likewise. * lib/posix_openpt.c: Likewise. * lib/ptsname_r.c: Likewise. * lib/readutmp.c: Likewise. * lib/readutmp.h: Likewise. * lib/resource-ext.h: Likewise. * lib/safe-read.h: Likewise. * lib/safe-write.h: Likewise. * lib/save-cwd.c: Likewise. * lib/stdbool.in.h: Likewise. * lib/striconv.c: Likewise. * lib/striconveh.c: Likewise. * lib/termcap.h: Likewise. * lib/terminfo.h: Likewise. * lib/unistd.in.h: Likewise. * lib/vasnprintf.c: Likewise. * lib/wcrtomb.c: Likewise. * lib/wcsrtombs-state.c: Likewise. * m4/fenv-environment.m4: Likewise. * m4/fenv-exceptions-state.m4: Likewise. * m4/fenv-exceptions-tracking.m4: Likewise. * m4/fenv-rounding.m4: Likewise. * m4/fmod.m4: Likewise. * m4/getdomainname.m4: Likewise. * m4/getloadavg.m4: Likewise. * m4/getopt.m4: Likewise. * m4/hypot.m4: Likewise. * m4/hypotf.m4: Likewise. * m4/hypotl.m4: Likewise. * m4/iconv.m4: Likewise. * m4/intl-thread-locale.m4: Likewise. * m4/largefile.m4: Likewise. * m4/libdl.m4: Likewise. * m4/locale-ja.m4: Likewise. * m4/locale_h.m4: Likewise. * m4/log.m4: Likewise. * m4/log10.m4: Likewise. * m4/log10f.m4: Likewise. * m4/logf.m4: Likewise. * m4/modf.m4: Likewise. * m4/modff.m4: Likewise. * m4/modfl.m4: Likewise. * m4/pthread-rwlock.m4: Likewise. * m4/semaphore.m4: Likewise. * m4/socklen.m4: Likewise. * m4/stdint.m4: Likewise. * m4/strtod.m4: Likewise. * m4/strtof.m4: Likewise. * m4/strtold.m4: Likewise. * modules/sigsegv: Likewise. * posix-modules: Likewise. * pygnulib/GLImport.py: Likewise. * tests/init.sh: Likewise. * tests/test-echo.sh: Likewise. * tests/test-isatty.c: Likewise. * tests/test-math-h.c: Likewise. * tests/test-nonblocking-pipe.h: Likewise. * tests/test-nonblocking-socket.h: Likewise. * tests/test-strtod.h: Likewise. * tests/test-strtof.h: Likewise. * tests/test-strtold.h: Likewise. * tests/test-vasnprintf.c: Likewise. * tests/test-vasnwprintf.c: Likewise.
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m4/fenv-environment.m4
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# fenv-environment.m4 # serial 6 dnl Copyright (C) 2023-2025 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. dnl This file is offered as-is, without any warranty. AC_DEFUN([gl_FENV_ENVIRONMENT], [ AC_REQUIRE([gl_FENV_H_DEFAULTS]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl FE_DFL_ENV references an undefined global variable on dnl NetBSD 10.0/{hppa,sparc} and Cygwin 2.9.0 (see dnl <https://sourceware.org/pipermail/cygwin/2018-July/237888.html>). AC_CACHE_CHECK([whether FE_DFL_ENV is usable], [gl_cv_var_FE_DFL_ENV_works], [case "$host_os" in netbsd* | cygwin*) saved_LIBS="$LIBS" LIBS="$LIBS -lm" AC_LINK_IFELSE( [AC_LANG_PROGRAM([[ #include <fenv.h> fenv_t volatile env; ]], [[fenv_t const * volatile fenv_default = FE_DFL_ENV; env = *fenv_default; ]]) ], [gl_cv_var_FE_DFL_ENV_works=yes], [gl_cv_var_FE_DFL_ENV_works=no]) LIBS="$saved_LIBS" ;; *) gl_cv_var_FE_DFL_ENV_works="guessing yes" ;; esac ]) case "$gl_cv_var_FE_DFL_ENV_works" in *yes) AC_DEFINE([HAVE_FE_DFL_ENV], [1], [Define to 1 if FE_DFL_ENV from <fenv.h> is usable.]) ;; *) dnl If FE_DFL_ENV is not usable, we not only need to redefine it, dnl but also override fesetenv and feupdateenv. REPLACE_FESETENV=1 REPLACE_FEUPDATEENV=1 ;; esac gl_MATHFUNC([fesetenv], [int], [(fenv_t const *)], [ #include <fenv.h> fenv_t fenv_ret; #if HAVE_FE_DFL_ENV /* FreeBSD often has fesetenv inline in <fenv.h>, but needs -lm for FE_DFL_ENV. */ fenv_t const *fenv_default = FE_DFL_ENV; #endif ]) if test $gl_cv_func_fesetenv_no_libm = yes \ || test $gl_cv_func_fesetenv_in_libm = yes; then dnl It needs linking with -lm on dnl glibc, FreeBSD, NetBSD, OpenBSD, AIX, HP-UX, Solaris, Android. if test $gl_cv_func_fesetenv_no_libm = yes; then FENV_ENVIRONMENT_LIBM= else FENV_ENVIRONMENT_LIBM=-lm fi dnl The feholdexcept function does not work on glibc 2.5 (see dnl <https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=a8c79c4088e8c04e4297936efa0dee6c8e6e974d>) dnl and on FreeBSD 12.2/arm64. dnl Also, on musl libc for most CPUs, it does not clear the exception trap dnl bits. It's mentioned in dnl <https://wiki.musl-libc.org/functional-differences-from-glibc.html>. dnl Likewise on mingw: it does not clear the exception trap bits. dnl Whereas on MSVC, this function may even fail. AC_CACHE_CHECK([whether feholdexcept works], [gl_cv_func_feholdexcept_works], [case "$host_os" in # Guess no on glibc ≤ 2.5. *-gnu* | gnu*) AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([[ #include <string.h> /* for __GNU_LIBRARY__ */ #ifdef __GNU_LIBRARY__ #include <features.h> #if __GLIBC__ == 2 && __GLIBC_MINOR__ <= 5 Unlucky user #endif #endif ]], [])], [gl_cv_func_feholdexcept_works="guessing yes"], [gl_cv_func_feholdexcept_works="guessing no"]) ;; *-musl* | midipix*) dnl This is only needed when the module 'fenv-exceptions-trapping' is dnl in use. m4_ifdef([g][l_FENV_EXCEPTIONS_TRAPPING], [ case "$host_cpu" in riscv*) dnl This architecture does not have exception trap bits anyway. gl_cv_func_feholdexcept_works="guessing yes" ;; i?86) dnl On this architecture, the feholdexcept override happens to dnl not be needed. gl_cv_func_feholdexcept_works="guessing yes" ;; *) gl_cv_func_feholdexcept_works="guessing no" ;; esac ], [gl_cv_func_feholdexcept_works="guessing yes"]) ;; mingw* | windows*) gl_cv_func_feholdexcept_works="guessing no" ;; *) dnl This test fails on FreeBSD 12.2/arm64. saved_LIBS="$LIBS" LIBS="$LIBS $FENV_ENVIRONMENT_LIBM" AC_RUN_IFELSE( [AC_LANG_PROGRAM([[ #include <fenv.h> ]], [[fenv_t env; feclearexcept (FE_ALL_EXCEPT); feraiseexcept (FE_INVALID | FE_OVERFLOW | FE_INEXACT); return (feholdexcept (&env) == 0 && fetestexcept (FE_ALL_EXCEPT) != 0); ]]) ], [gl_cv_func_feholdexcept_works="guessing yes"], [gl_cv_func_feholdexcept_works=no], [gl_cv_func_feholdexcept_works="guessing yes"]) LIBS="$saved_LIBS" ;; esac ]) case "$gl_cv_func_feholdexcept_works" in *yes) ;; *) REPLACE_FEHOLDEXCEPT=1 ;; esac dnl The fegetenv function does not work on glibc 2.19/x86_64 dnl (see <https://sourceware.org/PR16198>) dnl and Mac OS X 10.5/{i386,x86_64}. AC_CACHE_CHECK([whether fegetenv works], [gl_cv_func_fegetenv_works], [case "$host" in # Guess no on glibc ≤ 2.19 / x86_64. x86_64-*-*-gnu* | x86_64-*-gnu*) AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([[ #include <string.h> /* for __GNU_LIBRARY__ */ #ifdef __GNU_LIBRARY__ #include <features.h> #if __GLIBC__ == 2 && __GLIBC_MINOR__ <= 19 Unlucky user #endif #endif ]], [])], [gl_cv_func_fegetenv_works="guessing yes"], [gl_cv_func_fegetenv_works="guessing no"]) ;; # Guess no on Mac OS X/{i386,x86_64}. *86*-*-darwin*) gl_cv_func_fegetenv_works="guessing no" ;; *) gl_cv_func_fegetenv_works="guessing yes" ;; esac ]) case "$gl_cv_func_fegetenv_works" in *yes) ;; *) REPLACE_FEGETENV=1 ;; esac dnl The fesetenv function does not work on FreeBSD 12.2/arm64 (see dnl <https://cgit.freebsd.org/src/commit/?id=34cc08e336987a8ebc316595e3f552a4c09f1fd4>), dnl on mingw 13 (where fesetenv (FE_DFL_ENV) does not reset the rounding dnl direction), dnl on musl libc/{i386,x86_64} and AIX and Solaris and MSVC 14 (where it dnl fails to restore the exception trap bits), dnl on mingw < 13 (where calling it with FE_DFL_ENV argument has no effect dnl on the mxcsr register), dnl and on NetBSD/m68k. AC_CACHE_CHECK([whether fesetenv works], [gl_cv_func_fesetenv_works], [case "$host" in i?86-*-*-musl* | x86_64-*-*-musl*) dnl This is only needed when the module 'fenv-exceptions-trapping' is dnl in use. m4_ifdef([g][l_FENV_EXCEPTIONS_TRAPPING], [ gl_cv_func_fesetenv_works="guessing no" ], [gl_cv_func_fesetenv_works="guessing yes"]) ;; *-*-aix*) saved_LIBS="$LIBS" LIBS="$LIBS $FENV_ENVIRONMENT_LIBM" AC_RUN_IFELSE( [AC_LANG_PROGRAM([[ #include <fenv.h> #include <fptrap.h> ]], [[fenv_t env; feclearexcept (FE_ALL_EXCEPT); if (fegetenv (&env) == 0) { fp_enable (TRP_DIV_BY_ZERO); if (!fp_is_enabled (TRP_DIV_BY_ZERO)) return 1; if (fesetenv (&env) == 0 && fp_is_enabled (TRP_DIV_BY_ZERO)) return 2; } return 0; ]]) ], [gl_cv_func_fesetenv_works="guessing yes"], [gl_cv_func_fesetenv_works=no], [gl_cv_func_fesetenv_works="guessing no"]) LIBS="$saved_LIBS" ;; *-*-solaris*) saved_LIBS="$LIBS" LIBS="$LIBS $FENV_ENVIRONMENT_LIBM" AC_RUN_IFELSE( [AC_LANG_PROGRAM([[ #include <fenv.h> #include <ieeefp.h> ]], [[fenv_t env1, env2; feclearexcept (FE_ALL_EXCEPT); if (fegetenv (&env1) == 0) { fpsetmask (FP_X_DZ); if (fegetenv (&env2) == 0) { if (fpgetmask () != FP_X_DZ) return 1; if (fesetenv (&env1) == 0) { if (fpgetmask () != 0) return 2; fpsetmask (FP_X_INV); if (fpgetmask () != FP_X_INV) return 3; if (fesetenv (&env2) == 0) { if (fpgetmask () != FP_X_DZ) return 4; } } } } return 0; ]]) ], [gl_cv_func_fesetenv_works="guessing yes"], [gl_cv_func_fesetenv_works=no], [gl_cv_func_fesetenv_works="guessing no"]) LIBS="$saved_LIBS" ;; # Guess no on NetBSD/m68k. m68*-*-netbsd*) gl_cv_func_fesetenv_works="guessing no" ;; # Guess no on mingw and MSVC. *86*-*-mingw* | *86*-*-windows*) gl_cv_func_fesetenv_works="guessing no" ;; *) dnl This test fails on FreeBSD 12.2/arm64. dnl Here we test only the rounding mode restoration, but the function dnl is more broken than that. saved_LIBS="$LIBS" LIBS="$LIBS $FENV_ENVIRONMENT_LIBM" AC_RUN_IFELSE( [AC_LANG_PROGRAM([[ #include <fenv.h> ]], [[fenv_t env; return (fesetround (FE_TOWARDZERO) == 0 && fegetenv (&env) == 0 && fesetround (FE_TONEAREST) == 0 && fesetenv (&env) == 0 && fegetround () != FE_TOWARDZERO); ]]) ], [gl_cv_func_fesetenv_works="guessing yes"], [gl_cv_func_fesetenv_works=no], [gl_cv_func_fesetenv_works="guessing yes"]) LIBS="$saved_LIBS" ;; esac ]) case "$gl_cv_func_fesetenv_works" in *yes) ;; *) REPLACE_FESETENV=1 ;; esac dnl The feupdateenv function does not work on glibc 2.37/riscv64 dnl (see <https://sourceware.org/PR31022>) dnl and on glibc 2.37/hppa dnl (see <https://sourceware.org/PR31023>) dnl and on glibc 2.5/{i386,x86_64,ia64} (see dnl <https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=a8c79c4088e8c04e4297936efa0dee6c8e6e974d>) dnl and on Mac OS X 10.5/{i386,x86_64} (where it forgets about the currently dnl set floating-point exception flags) dnl and on musl libc/s390x and NetBSD 10.0/powerpc (where it does not dnl trigger traps) dnl and on musl libc/{i386,x86_64} and AIX and Solaris and mingw 10 (where dnl it fails to restore the exception trap bits), dnl and on FreeBSD 12.2/arm64 (see dnl <https://cgit.freebsd.org/src/commit/?id=34cc08e336987a8ebc316595e3f552a4c09f1fd4>), dnl and on mingw 13 (where feupdateenv (FE_DFL_ENV) does not restore the dnl rounding direction). dnl On MSVC 14 it may even fail. AC_CACHE_CHECK([whether feupdateenv works], [gl_cv_func_feupdateenv_works], [case "$host" in # Guess no on glibc/riscv. riscv*-*-*-gnu*) saved_LIBS="$LIBS" LIBS="$LIBS $FENV_ENVIRONMENT_LIBM" AC_RUN_IFELSE( [AC_LANG_PROGRAM([[ #include <fenv.h> ]], [[return feupdateenv (FE_DFL_ENV) != 0; ]]) ], [gl_cv_func_feupdateenv_works=yes], [gl_cv_func_feupdateenv_works=no], [gl_cv_func_feupdateenv_works="guessing no"]) LIBS="$saved_LIBS" ;; # Guess no on glibc/hppa and NetBSD/powerpc64. hppa*-*-*-gnu* | powerpc*-*-netbsd*) saved_LIBS="$LIBS" LIBS="$LIBS $FENV_ENVIRONMENT_LIBM" AC_RUN_IFELSE( [AC_LANG_PROGRAM([[ #include <fenv.h> ]], [[fenv_t env; feclearexcept (FE_ALL_EXCEPT); feenableexcept (FE_INVALID); fegetenv (&env); fesetenv (FE_DFL_ENV); feraiseexcept (FE_INVALID); feupdateenv (&env); return 0; ]]) ], [gl_cv_func_feupdateenv_works=no], [gl_cv_func_feupdateenv_works="guessing yes"], [gl_cv_func_feupdateenv_works="guessing no"]) LIBS="$saved_LIBS" ;; # Guess no on glibc ≤ 2.5/{i386,x86_64,ia64}. *86*-*-*-gnu* | *86*-*-gnu* | ia64*-*-*-gnu*) AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([[ #include <string.h> /* for __GNU_LIBRARY__ */ #ifdef __GNU_LIBRARY__ #include <features.h> #if __GLIBC__ == 2 && __GLIBC_MINOR__ <= 5 Unlucky user #endif #endif ]], [])], [gl_cv_func_feupdateenv_works="guessing yes"], [gl_cv_func_feupdateenv_works="guessing no"]) ;; i?86-*-*-musl* | x86_64-*-*-musl* | \ s390*-*-*-musl*) dnl This is only needed when the module 'fenv-exceptions-trapping' is dnl in use. m4_ifdef([g][l_FENV_EXCEPTIONS_TRAPPING], [ gl_cv_func_feupdateenv_works="guessing no" ], [gl_cv_func_feupdateenv_works="guessing yes"]) ;; *-*-aix*) saved_LIBS="$LIBS" LIBS="$LIBS $FENV_ENVIRONMENT_LIBM" AC_RUN_IFELSE( [AC_LANG_PROGRAM([[ #include <fenv.h> #include <fptrap.h> ]], [[fenv_t env; feclearexcept (FE_ALL_EXCEPT); if (fegetenv (&env) == 0) { fp_enable (TRP_DIV_BY_ZERO); if (!fp_is_enabled (TRP_DIV_BY_ZERO)) return 1; if (feupdateenv (&env) == 0 && fp_is_enabled (TRP_DIV_BY_ZERO)) return 2; } return 0; ]]) ], [gl_cv_func_feupdateenv_works="guessing yes"], [gl_cv_func_feupdateenv_works=no], [gl_cv_func_feupdateenv_works="guessing no"]) LIBS="$saved_LIBS" ;; *-*-solaris*) saved_LIBS="$LIBS" LIBS="$LIBS $FENV_ENVIRONMENT_LIBM" AC_RUN_IFELSE( [AC_LANG_PROGRAM([[ #include <fenv.h> #include <ieeefp.h> ]], [[fenv_t env1, env2; feclearexcept (FE_ALL_EXCEPT); if (fegetenv (&env1) == 0) { fpsetmask (FP_X_DZ); if (fegetenv (&env2) == 0) { if (fpgetmask () != FP_X_DZ) return 1; if (feupdateenv (&env1) == 0) { if (fpgetmask () != 0) return 2; fpsetmask (FP_X_INV); if (fpgetmask () != FP_X_INV) return 3; if (feupdateenv (&env2) == 0) { if (fpgetmask () != FP_X_DZ) return 4; } } } } return 0; ]]) ], [gl_cv_func_feupdateenv_works="guessing yes"], [gl_cv_func_feupdateenv_works=no], [gl_cv_func_feupdateenv_works="guessing no"]) LIBS="$saved_LIBS" ;; # Guess no on Mac OS X/{i386,x86_64}. *86*-*-darwin*) gl_cv_func_feupdateenv_works="guessing no" ;; # Guess no on mingw and MSVC. *86*-*-mingw* | *86*-*-windows*) gl_cv_func_feupdateenv_works="guessing no" ;; *) dnl This test fails on FreeBSD 12.2/arm64. dnl Here we test only the rounding mode restoration, but the function dnl is more broken than that. saved_LIBS="$LIBS" LIBS="$LIBS $FENV_ENVIRONMENT_LIBM" AC_RUN_IFELSE( [AC_LANG_PROGRAM([[ #include <fenv.h> ]], [[fenv_t env; return (fesetround (FE_TOWARDZERO) == 0 && fegetenv (&env) == 0 && fesetround (FE_TONEAREST) == 0 && feupdateenv (&env) == 0 && fegetround () != FE_TOWARDZERO); ]]) ], [gl_cv_func_feupdateenv_works="guessing yes"], [gl_cv_func_feupdateenv_works=no], [gl_cv_func_feupdateenv_works="guessing yes"]) LIBS="$saved_LIBS" ;; esac ]) case "$gl_cv_func_feupdateenv_works" in *yes) ;; *) REPLACE_FEUPDATEENV=1 ;; esac dnl Two functions are in the same compilation unit. if test $REPLACE_FEGETENV = 1 || test $REPLACE_FESETENV = 1; then REPLACE_FEGETENV=1 REPLACE_FESETENV=1 fi dnl On AIX, feholdexcept, like fegetenv, does not save the exception trap dnl bits. case "$host_os" in aix*) if test $REPLACE_FEGETENV = 1; then REPLACE_FEHOLDEXCEPT=1 fi ;; esac else HAVE_FEGETENV=0 HAVE_FESETENV=0 HAVE_FEUPDATEENV=0 HAVE_FEHOLDEXCEPT=0 dnl It needs linking with -lm on platforms which define FE_DFL_ENV as the dnl address of a global variable. case "$host" in powerpc*-*-linux*-gnu* | \ *-*-freebsd* | *-*-dragonfly* | \ *-*-netbsd* | \ *-*-openbsd* | \ *-*-solaris* ) FENV_ENVIRONMENT_LIBM=-lm ;; *) FENV_ENVIRONMENT_LIBM= ;; esac fi AC_SUBST([FENV_ENVIRONMENT_LIBM]) ])