diff options
Diffstat (limited to 'lib/gl/m4/float_h.m4')
-rw-r--r-- | lib/gl/m4/float_h.m4 | 53 |
1 files changed, 51 insertions, 2 deletions
diff --git a/lib/gl/m4/float_h.m4 b/lib/gl/m4/float_h.m4 index 261f1ac3af..0420e06921 100644 --- a/lib/gl/m4/float_h.m4 +++ b/lib/gl/m4/float_h.m4 @@ -1,4 +1,4 @@ -# float_h.m4 serial 7 +# float_h.m4 serial 9 dnl Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -33,17 +33,66 @@ changequote([,])dnl ;; esac ;; + linux*) + case "$host_cpu" in + powerpc*) + FLOAT_H=float.h + ;; + esac + ;; esac case "$host_os" in - aix* | freebsd*) + aix* | freebsd* | linux*) if test -n "$FLOAT_H"; then REPLACE_FLOAT_LDBL=1 fi ;; esac + + dnl Test against glibc-2.7 Linux/SPARC64 bug. + REPLACE_ITOLD=0 + AC_CACHE_CHECK([whether conversion from 'int' to 'long double' works], + [gl_cv_func_itold_works], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +int i = -1; +volatile long double ld; +int main () +{ + ld += i * 1.0L; + if (ld > 0) + return 1; + return 0; +}]])], + [gl_cv_func_itold_works=yes], + [gl_cv_func_itold_works=no], + [case "$host" in + sparc*-*-linux*) + AC_EGREP_CPP([yes], + [#if defined __LP64__ || defined __arch64__ + yes + #endif], + [gl_cv_func_itold_works="guessing no"], + [gl_cv_func_itold_works="guessing yes"]) + ;; + *) gl_cv_func_itold_works="guessing yes" ;; + esac + ]) + ]) + case "$gl_cv_func_itold_works" in + *no) + REPLACE_ITOLD=1 + dnl We add the workaround to <float.h> but also to <math.h>, + dnl to increase the chances that the fix function gets pulled in. + FLOAT_H=float.h + ;; + esac + if test -n "$FLOAT_H"; then gl_NEXT_HEADERS([float.h]) fi AC_SUBST([FLOAT_H]) AM_CONDITIONAL([GL_GENERATE_FLOAT_H], [test -n "$FLOAT_H"]) + AC_SUBST([REPLACE_ITOLD]) ]) |