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Diffstat (limited to 'm4/compiler.m4')
| -rw-r--r-- | m4/compiler.m4 | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/m4/compiler.m4 b/m4/compiler.m4 new file mode 100644 index 0000000..eb94510 --- /dev/null +++ b/m4/compiler.m4 @@ -0,0 +1,32 @@ +dnl Copyright (C) 2008-2011 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +dnl From Simon Josefsson +dnl -- derivated from coreutils m4/warnings.m4 + +# UL_AS_VAR_APPEND(VAR, VALUE) +# ---------------------------- +# Provide the functionality of AS_VAR_APPEND if Autoconf does not have it. +m4_ifdef([AS_VAR_APPEND], +[m4_copy([AS_VAR_APPEND], [UL_AS_VAR_APPEND])], +[m4_define([UL_AS_VAR_APPEND], +[AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])]) + +# UL_ADD_WARN([parameter]) +# ------------------------ +# Adds parameter to WARN_CFLAGS if the compiler supports it. +AC_DEFUN([UL_WARN_ADD], [ + AS_VAR_PUSHDEF([ul_Warn], [ul_cv_warn_$1])dnl + AC_CACHE_CHECK([whether compiler handles $1], m4_defn([ul_Warn]), [ + ul_save_CPPFLAGS="$CPPFLAGS" + CPPFLAGS="-Werror ${CPPFLAGS} $1" + AC_PREPROC_IFELSE([AC_LANG_PROGRAM([])], + [AS_VAR_SET(ul_Warn, [yes])], + [AS_VAR_SET(ul_Warn, [no])]) + CPPFLAGS="$ul_save_CPPFLAGS" + ]) + AS_VAR_IF(ul_Warn, [yes], [UL_AS_VAR_APPEND([WARN_CFLAGS], [" $1"])]) +]) + |