Mercurial > gnulib
view m4/check-math-lib.m4 @ 17364:7524d97ae56f
stdalign: port to stricter ISO C11
ISO C11 says that _Alignof's operand must be a parenthesized type.
Problem reported by Eli Zaretskii in
<http://lists.gnu.org/archive/html/emacs-devel/2013-03/msg00960.html>.
* doc/posix-headers/stdalign.texi (stdalign.h): Document this.
* m4/stdalign.m4 (gl_STDALIGN_H): Don't use _Alignof (expr).
author | Paul Eggert <eggert@cs.ucla.edu> |
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date | Fri, 29 Mar 2013 19:47:13 -0700 |
parents | e542fd46ad6f |
children | 344018b6e5d7 |
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# check-math-lib.m4 serial 4 dnl Copyright (C) 2007, 2009-2013 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 dnl gl_CHECK_MATH_LIB (VARIABLE, EXPRESSION [, EXTRA-CODE]) dnl dnl Sets the shell VARIABLE according to the libraries needed by EXPRESSION dnl to compile and link: to the empty string if no extra libraries are needed, dnl to "-lm" if -lm is needed, or to "missing" if it does not compile and dnl link either way. dnl dnl Example: gl_CHECK_MATH_LIB([ROUNDF_LIBM], [x = roundf (x);]) AC_DEFUN([gl_CHECK_MATH_LIB], [ save_LIBS=$LIBS $1=missing for libm in "" "-lm"; do LIBS="$save_LIBS $libm" AC_LINK_IFELSE([AC_LANG_PROGRAM([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> $3 double x;]], [$2])], [$1=$libm break]) done LIBS=$save_LIBS ])