mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-26 07:33:47 +00:00
107 lines
3.8 KiB
Plaintext
107 lines
3.8 KiB
Plaintext
# warnings.m4 serial 13
|
|
dnl Copyright (C) 2008-2019 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
|
|
|
|
# gl_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], [gl_AS_VAR_APPEND])],
|
|
[m4_define([gl_AS_VAR_APPEND],
|
|
[AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])])
|
|
|
|
|
|
# gl_COMPILER_OPTION_IF(OPTION, [IF-SUPPORTED], [IF-NOT-SUPPORTED],
|
|
# [PROGRAM = AC_LANG_PROGRAM()])
|
|
# -----------------------------------------------------------------
|
|
# Check if the compiler supports OPTION when compiling PROGRAM.
|
|
#
|
|
# The effects of this macro depend on the current language (_AC_LANG).
|
|
AC_DEFUN([gl_COMPILER_OPTION_IF],
|
|
[
|
|
dnl FIXME: gl_Warn must be used unquoted until we can assume Autoconf
|
|
dnl 2.64 or newer.
|
|
AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl
|
|
AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl
|
|
AS_LITERAL_IF([$1],
|
|
[m4_pushdef([gl_Positive], m4_bpatsubst([$1], [^-Wno-], [-W]))],
|
|
[gl_positive="$1"
|
|
case $gl_positive in
|
|
-Wno-*) gl_positive=-W`expr "X$gl_positive" : 'X-Wno-\(.*\)'` ;;
|
|
esac
|
|
m4_pushdef([gl_Positive], [$gl_positive])])dnl
|
|
AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [
|
|
gl_save_compiler_FLAGS="$gl_Flags"
|
|
gl_AS_VAR_APPEND(m4_defn([gl_Flags]),
|
|
[" $gl_unknown_warnings_are_errors ]m4_defn([gl_Positive])["])
|
|
AC_LINK_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])],
|
|
[AS_VAR_SET(gl_Warn, [yes])],
|
|
[AS_VAR_SET(gl_Warn, [no])])
|
|
gl_Flags="$gl_save_compiler_FLAGS"
|
|
])
|
|
AS_VAR_IF(gl_Warn, [yes], [$2], [$3])
|
|
m4_popdef([gl_Positive])dnl
|
|
AS_VAR_POPDEF([gl_Flags])dnl
|
|
AS_VAR_POPDEF([gl_Warn])dnl
|
|
])
|
|
|
|
# gl_UNKNOWN_WARNINGS_ARE_ERRORS
|
|
# ------------------------------
|
|
# Clang doesn't complain about unknown warning options unless one also
|
|
# specifies -Wunknown-warning-option -Werror. Detect this.
|
|
#
|
|
# The effects of this macro depend on the current language (_AC_LANG).
|
|
AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS],
|
|
[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
|
|
|
|
# Specialization for _AC_LANG = C. This macro can be AC_REQUIREd.
|
|
# Use of m4_defun rather than AC_DEFUN works around a bug in autoconf < 2.63b.
|
|
m4_defun([gl_UNKNOWN_WARNINGS_ARE_ERRORS(C)],
|
|
[
|
|
AC_LANG_PUSH([C])
|
|
gl_UNKNOWN_WARNINGS_ARE_ERRORS_IMPL
|
|
AC_LANG_POP([C])
|
|
])
|
|
|
|
# Specialization for _AC_LANG = C++. This macro can be AC_REQUIREd.
|
|
# Use of m4_defun rather than AC_DEFUN works around a bug in autoconf < 2.63b.
|
|
m4_defun([gl_UNKNOWN_WARNINGS_ARE_ERRORS(C++)],
|
|
[
|
|
AC_LANG_PUSH([C++])
|
|
gl_UNKNOWN_WARNINGS_ARE_ERRORS_IMPL
|
|
AC_LANG_POP([C++])
|
|
])
|
|
|
|
AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS_IMPL],
|
|
[gl_COMPILER_OPTION_IF([-Werror -Wunknown-warning-option],
|
|
[gl_unknown_warnings_are_errors='-Wunknown-warning-option -Werror'],
|
|
[gl_unknown_warnings_are_errors=])])
|
|
|
|
# gl_WARN_ADD(OPTION, [VARIABLE = WARN_CFLAGS/WARN_CXXFLAGS],
|
|
# [PROGRAM = AC_LANG_PROGRAM()])
|
|
# -----------------------------------------------------------
|
|
# Adds parameter to WARN_CFLAGS/WARN_CXXFLAGS if the compiler supports it
|
|
# when compiling PROGRAM. For example, gl_WARN_ADD([-Wparentheses]).
|
|
#
|
|
# If VARIABLE is a variable name, AC_SUBST it.
|
|
#
|
|
# The effects of this macro depend on the current language (_AC_LANG).
|
|
AC_DEFUN([gl_WARN_ADD],
|
|
[AC_REQUIRE([gl_UNKNOWN_WARNINGS_ARE_ERRORS(]_AC_LANG[)])
|
|
gl_COMPILER_OPTION_IF([$1],
|
|
[gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_]_AC_LANG_PREFIX[FLAGS]], [[$2]]), [" $1"])],
|
|
[],
|
|
[$3])
|
|
m4_ifval([$2],
|
|
[AS_LITERAL_IF([$2], [AC_SUBST([$2])])],
|
|
[AC_SUBST([WARN_]_AC_LANG_PREFIX[FLAGS])])dnl
|
|
])
|
|
|
|
# Local Variables:
|
|
# mode: autoconf
|
|
# End:
|