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| author | Karel Zak | 2012-06-06 12:10:41 +0200 |
|---|---|---|
| committer | Karel Zak | 2012-06-06 12:10:41 +0200 |
| commit | 0e60bc9b152a3414c04c50523b5bf555665a6cea (patch) | |
| tree | c537c21262310abc2323df9c14c98ea5e56fa632 /m4 | |
| parent | fdisk: fix io_size usage in new API (diff) | |
| download | kernel-qcow2-util-linux-0e60bc9b152a3414c04c50523b5bf555665a6cea.tar.gz kernel-qcow2-util-linux-0e60bc9b152a3414c04c50523b5bf555665a6cea.tar.xz kernel-qcow2-util-linux-0e60bc9b152a3414c04c50523b5bf555665a6cea.zip | |
build-sys: add compiler warnings
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/warnings.m4 | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/m4/warnings.m4 b/m4/warnings.m4 new file mode 100644 index 000000000..33160a960 --- /dev/null +++ b/m4/warnings.m4 @@ -0,0 +1,38 @@ +# warnings.m4 serial 5 +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 + +# 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_WARN_ADD(PARAMETER, [VARIABLE = WARN_CFLAGS]) +# ------------------------------------------------ +# Adds parameter to WARN_CFLAGS if the compiler supports it. For example, +# UL_WARN_ADD([-Wparentheses]). +AC_DEFUN([UL_WARN_ADD], +dnl FIXME: ul_Warn must be used unquoted until we can assume +dnl autoconf 2.64 or newer. +[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="${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(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])]) +AS_VAR_POPDEF([ul_Warn])dnl +m4_ifval([$2], [AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])])dnl +]) |