logl lacks precision on musl libc 1.2.2/arm64, musl libc 1.2.2/s390x. Fortunately the configure test meant for NetBSD already catches it.
2021-01-31 Bruno Haible <br...@clisp.org> logl: Document musl libc bug. * doc/posix-functions/logl.texi: Document musl libc bug. * m4/logl.m4 (gl_FUNC_LOGL_WORKS): Update comment and cross compilation guess. diff --git a/doc/posix-functions/logl.texi b/doc/posix-functions/logl.texi index 1e7918b..e0d04b5 100644 --- a/doc/posix-functions/logl.texi +++ b/doc/posix-functions/logl.texi @@ -20,7 +20,7 @@ glibc 2.7 on Linux/SPARC64. @item This function produces results which are accurate to only 16 digits on some platforms: -NetBSD 9.0. +musl libc 1.2.2/arm64, musl libc 1.2.2/s390x, NetBSD 9.0. @end itemize Portability problems not fixed by Gnulib: diff --git a/m4/logl.m4 b/m4/logl.m4 index 128170a..7dcdac1 100644 --- a/m4/logl.m4 +++ b/m4/logl.m4 @@ -1,4 +1,4 @@ -# logl.m4 serial 14 +# logl.m4 serial 15 dnl Copyright (C) 2010-2021 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -166,7 +166,7 @@ int main (int argc, char *argv[]) if (!(gy + gy == gy)) result |= 1; } - /* This test fails on NetBSD 9.0. */ + /* This test fails on musl 1.2.2/arm64, musl 1.2.2/s390x, NetBSD 9.0. */ { const long double TWO_LDBL_MANT_DIG = /* 2^LDBL_MANT_DIG */ (long double) (1U << ((LDBL_MANT_DIG - 1) / 5)) @@ -188,8 +188,8 @@ int main (int argc, char *argv[]) [case "$host_os" in # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_logl_works="guessing yes" ;; - # Guess yes on musl systems. - *-musl*) gl_cv_func_logl_works="guessing yes" ;; + # Guess no on musl systems. + *-musl*) gl_cv_func_logl_works="guessing no" ;; # Guess yes on native Windows. mingw*) gl_cv_func_logl_works="guessing yes" ;; # If we don't know, obey --enable-cross-guesses.