80 lines
2.9 KiB
Plaintext
80 lines
2.9 KiB
Plaintext
# warnings.m4 serial 11
|
|
dnl Copyright (C) 2008-2013 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.
|
|
#
|
|
# FIXME: gl_Warn must be used unquoted until we can assume Autoconf
|
|
# 2.64 or newer.
|
|
AC_DEFUN([gl_COMPILER_OPTION_IF],
|
|
[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.
|
|
AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS],
|
|
[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],
|
|
# [PROGRAM = AC_LANG_PROGRAM()])
|
|
# ---------------------------------------------
|
|
# Adds parameter to WARN_CFLAGS if the compiler supports it when
|
|
# compiling PROGRAM. For example, gl_WARN_ADD([-Wparentheses]).
|
|
#
|
|
# If VARIABLE is a variable name, AC_SUBST it.
|
|
AC_DEFUN([gl_WARN_ADD],
|
|
[AC_REQUIRE([gl_UNKNOWN_WARNINGS_ARE_ERRORS])
|
|
gl_COMPILER_OPTION_IF([$1],
|
|
[gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])],
|
|
[],
|
|
[$3])
|
|
m4_ifval([$2],
|
|
[AS_LITERAL_IF([$2], [AC_SUBST([$2])])],
|
|
[AC_SUBST([WARN_CFLAGS])])dnl
|
|
])
|
|
|
|
# Local Variables:
|
|
# mode: autoconf
|
|
# End:
|