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build-sys: avoid icc warnings "ignoring unknown option" 

Our macro UL_WARN_ADD could not discover these ones:
icc: command line warning #10006: ignoring unknown option '-Wmissing-parameter-type'
icc: command line warning #10006: ignoring unknown option '-Wredundant-decls'
icc: command line warning #10006: ignoring unknown option '-Wunused-result'
icc: command line warning #10006: ignoring unknown option '-Wnested-externs'

We need to use AC_LANG_WERROR.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
This commit is contained in:
Ruediger Meier 2015-01-20 13:49:55 +01:00
parent fa8f8b7469
commit e85e8720d5
1 changed files with 7 additions and 0 deletions
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7
m4/compiler.m4
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@ -21,11 +21,18 @@ AC_DEFUN([UL_WARN_ADD], [
m4_define([warnvarname], m4_default([$2],WARN_CFLAGS))
AS_VAR_PUSHDEF([ul_Warn], [ul_cv_warn_$1])dnl
AC_CACHE_CHECK([whether compiler handles $1], m4_defn([ul_Warn]), [
# store AC_LANG_WERROR status, then turn it on
save_ac_[]_AC_LANG_ABBREV[]_werror_flag="${ac_[]_AC_LANG_ABBREV[]_werror_flag}"
AC_LANG_WERROR
ul_save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="-Werror ${CPPFLAGS} $1"
AC_PREPROC_IFELSE([AC_LANG_PROGRAM([])],
[AS_VAR_SET(ul_Warn, [yes])],
[AS_VAR_SET(ul_Warn, [no])])
# restore AC_LANG_WERROR
ac_[]_AC_LANG_ABBREV[]_werror_flag="${save_ac_[]_AC_LANG_ABBREV[]_werror_flag}"
CPPFLAGS="$ul_save_CPPFLAGS"
])
AS_VAR_IF(ul_Warn, [yes], [UL_AS_VAR_APPEND(warnvarname, [" $1"])])