strace/m4/warnings.m4
Dmitry V. Levin f91def0384 m4: prepare gl_WARN_ADD for simultaneous use of multiple compilers
* m4/warnings.m4 (gl_COMPILER_OPTION_IF): Change gl_Flags to use
_AC_LANG_PREFIX[]FLAGS in unquoted form.  Change gl_Warn to use gl_Flags
instead of _AC_LANG_ABBREV.  Change notification message to mention
the variable name of the compiler.
(gl_UNKNOWN_WARNINGS_ARE_ERRORS): Do nothing if
gl_unknown_warnings_are_errors is set.
(gl_WARN_ADD): Change the use of gl_UNKNOWN_WARNINGS_ARE_ERRORS from
AC_REQUIRE to a regular call.
2016-12-07 15:53:13 +00:00

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# warnings.m4 serial 11
# modified for strace project
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_Flags], _AC_LANG_PREFIX[]FLAGS)dnl
AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]gl_Flags[]_$1])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_CC[] 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], [$3])
m4_popdef([gl_Positive])dnl
AS_VAR_POPDEF([gl_Flags])dnl
AS_VAR_POPDEF([gl_Warn])dnl
])
# gl_UNKNOWN_WARNINGS_ARE_ERRORS
# ------------------------------
# Clang doesn't complain about unknown warning options unless one also
# specifies -Wunknown-warning-option -Werror. Detect this.
AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS],
[AS_IF([test x${gl_unknown_warnings_are_errors+set} = x],
[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],
[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: