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bootstrap: remove 26 more gnulib modules

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* send, recv: we use write & read for sockets so don't
   need these portability wrappers
 * ioctl, fcntl, fcntl-h: any usage of these is conditionally
   compiled and excludes Windows
 * ttyname_r: this exists in all supported platforms that
   we require now
 * environ: the tests explicitly declare this global variable
 * intprops: the code has been converted / simplified
 * nonblocking: we have a custom impl now to work with our
   own sockets wrappers
 * openpty: custom checks in configure.ac cope with portability
 * accept, bind, connect, getpeername, getsockname, listen,
   setsockopt, socket: code needing Windows portability uses
   our wrapper functions
 * close: avoids abort when passed invalid FD on Windows.
   Our VIR_FORCE_CLOSE wrapper avoids calling close(-1)
   and it is reasonable to abort in other scenarios in
   the RPC client
 * physmem: the gnulib code has been partially imported
 * warnings, manywarnings: copy the files directly into
   our local m4 dir
 * verify: replaced by G_STATIC_ASSERT
 * pthread_sigmask: none of the fixed portability problems
   affect libvirt's usage on current supported platforms
 * termios: the header is now conditionally included only
   when needed
 * time_r: replaced with GDateTime APIs

Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2020-01-08 11:19:48 +00:00
parent 3caa28dc50
commit 9bb3571f10
3 changed files with 454 additions and 52 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
bootstrap.conf
View File

@ -24,44 +24,18 @@
# turning it into a FD, since closing an FD also closes # turning it into a FD, since closing an FD also closes
# the original HANDLE. # the original HANDLE.
# -> GSocket
gnulib_modules="$gnulib_modules accept"
# -> GSocket
gnulib_modules="$gnulib_modules bind"
# -> conditional build to avoid Win32 # -> conditional build to avoid Win32
gnulib_modules="$gnulib_modules chown" gnulib_modules="$gnulib_modules chown"
# -> GSocket
gnulib_modules="$gnulib_modules close"
# -> GSocket
gnulib_modules="$gnulib_modules connect"
# -> Meson # -> Meson
gnulib_modules="$gnulib_modules configmake" gnulib_modules="$gnulib_modules configmake"
# -> eliminate usage in some manner
gnulib_modules="$gnulib_modules environ"
# -> GSocket
gnulib_modules="$gnulib_modules fcntl"
# -> conditional build avoid win32
gnulib_modules="$gnulib_modules fcntl-h"
# -> GSocket # -> GSocket
gnulib_modules="$gnulib_modules getaddrinfo" gnulib_modules="$gnulib_modules getaddrinfo"
# -> copy gnuliub win32 impl # -> copy gnuliub win32 impl
gnulib_modules="$gnulib_modules getpass" gnulib_modules="$gnulib_modules getpass"
# -> GSocket
gnulib_modules="$gnulib_modules getpeername"
# -> GSocket
gnulib_modules="$gnulib_modules getsockname"
# -> copy gnulib STRBUFLEN macro
gnulib_modules="$gnulib_modules intprops"
# -> GSocket
gnulib_modules="$gnulib_modules ioctl"
# -> Meson # -> Meson
gnulib_modules="$gnulib_modules largefile" gnulib_modules="$gnulib_modules largefile"
# -> GSocket
gnulib_modules="$gnulib_modules listen"
# -> custom configure check # -> custom configure check
gnulib_modules="$gnulib_modules localeconv" gnulib_modules="$gnulib_modules localeconv"
# -> Meson
gnulib_modules="$gnulib_modules manywarnings"
# -> painful copy gnulib # -> painful copy gnulib
gnulib_modules="$gnulib_modules mgetgroups" gnulib_modules="$gnulib_modules mgetgroups"
# -> GSocket # -> GSocket
@ -69,13 +43,7 @@ gnulib_modules="$gnulib_modules net_if"
# -> GSocket # -> GSocket
gnulib_modules="$gnulib_modules netdb" gnulib_modules="$gnulib_modules netdb"
# -> GSocket # -> GSocket
gnulib_modules="$gnulib_modules nonblocking"
# -> Just add -lutil to cli
gnulib_modules="$gnulib_modules openpty"
# -> GSocket
gnulib_modules="$gnulib_modules passfd" gnulib_modules="$gnulib_modules passfd"
# -> open code / copy gnulib code
gnulib_modules="$gnulib_modules physmem"
# -> open code / conditional comp # -> open code / conditional comp
gnulib_modules="$gnulib_modules pipe-posix" gnulib_modules="$gnulib_modules pipe-posix"
# -> open code / conditional comp # -> open code / conditional comp
@ -85,19 +53,9 @@ gnulib_modules="$gnulib_modules poll"
# -> Meson # -> Meson
gnulib_modules="$gnulib_modules posix-shell" gnulib_modules="$gnulib_modules posix-shell"
# -> open code conditional logic # -> open code conditional logic
gnulib_modules="$gnulib_modules pthread_sigmask"
# -> GSocket
gnulib_modules="$gnulib_modules recv"
# -> GSocket
gnulib_modules="$gnulib_modules send"
# -> GSocket
gnulib_modules="$gnulib_modules setsockopt"
# -> open code conditional logic
gnulib_modules="$gnulib_modules sigaction" gnulib_modules="$gnulib_modules sigaction"
# -> open code conditional logic # -> open code conditional logic
gnulib_modules="$gnulib_modules sigpipe" gnulib_modules="$gnulib_modules sigpipe"
# -> GSocket
gnulib_modules="$gnulib_modules socket"
# -> open code conditional or use GIO GFileInfo # -> open code conditional or use GIO GFileInfo
gnulib_modules="$gnulib_modules stat-time" gnulib_modules="$gnulib_modules stat-time"
# -> remove use or open-code it. possibly add to glib # -> remove use or open-code it. possibly add to glib
@ -108,20 +66,10 @@ gnulib_modules="$gnulib_modules strtok_r"
gnulib_modules="$gnulib_modules sys_stat" gnulib_modules="$gnulib_modules sys_stat"
# -> remove sys/wait.h include from any win32 code paths # -> remove sys/wait.h include from any win32 code paths
gnulib_modules="$gnulib_modules sys_wait" gnulib_modules="$gnulib_modules sys_wait"
# -> remove from any win32 code paths
gnulib_modules="$gnulib_modules termios"
# -> GDateTime ?
gnulib_modules="$gnulib_modules time_r"
# -> obsolete - exists on Linux, MacOS >= ?? & FreeBSD >= 6
gnulib_modules="$gnulib_modules ttyname_r"
# -> g_get_os_info in GLib 2.64 but can't use that yet # -> g_get_os_info in GLib 2.64 but can't use that yet
gnulib_modules="$gnulib_modules uname" gnulib_modules="$gnulib_modules uname"
# -> G_STATIC_ASSERT
gnulib_modules="$gnulib_modules verify"
# -> remove from Win32 code paths # -> remove from Win32 code paths
gnulib_modules="$gnulib_modules waitpid" gnulib_modules="$gnulib_modules waitpid"
# -> Meson
gnulib_modules="$gnulib_modules warnings"
# -> open code impl # -> open code impl
gnulib_modules="$gnulib_modules wcwidth" gnulib_modules="$gnulib_modules wcwidth"

339
m4/virt-manywarnings.m4 Normal file
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@ -0,0 +1,339 @@
# manywarnings.m4 serial 18
dnl Copyright (C) 2008-2020 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_MANYWARN_COMPLEMENT(OUTVAR, LISTVAR, REMOVEVAR)
# --------------------------------------------------
# Copy LISTVAR to OUTVAR except for the entries in REMOVEVAR.
# Elements separated by whitespace. In set logic terms, the function
# does OUTVAR = LISTVAR \ REMOVEVAR.
AC_DEFUN([gl_MANYWARN_COMPLEMENT],
[
gl_warn_set=
set x $2; shift
for gl_warn_item
do
case " $3 " in
*" $gl_warn_item "*)
;;
*)
gl_warn_set="$gl_warn_set $gl_warn_item"
;;
esac
done
$1=$gl_warn_set
])
# gl_MANYWARN_ALL_GCC(VARIABLE)
# -----------------------------
# Add all documented GCC warning parameters to variable VARIABLE.
# Note that you need to test them using gl_WARN_ADD if you want to
# make sure your gcc understands it.
#
# The effects of this macro depend on the current language (_AC_LANG).
AC_DEFUN([gl_MANYWARN_ALL_GCC],
[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
# Specialization for _AC_LANG = C.
# Use of m4_defun rather than AC_DEFUN works around a bug in autoconf < 2.63b.
m4_defun([gl_MANYWARN_ALL_GCC(C)],
[
AC_LANG_PUSH([C])
dnl First, check for some issues that only occur when combining multiple
dnl gcc warning categories.
AC_REQUIRE([AC_PROG_CC])
if test -n "$GCC"; then
dnl Check if -W -Werror -Wno-missing-field-initializers is supported
dnl with the current $CC $CFLAGS $CPPFLAGS.
AC_CACHE_CHECK([whether -Wno-missing-field-initializers is supported],
[gl_cv_cc_nomfi_supported],
[gl_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -W -Werror -Wno-missing-field-initializers"
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[]], [[]])],
[gl_cv_cc_nomfi_supported=yes],
[gl_cv_cc_nomfi_supported=no])
CFLAGS="$gl_save_CFLAGS"
])
if test "$gl_cv_cc_nomfi_supported" = yes; then
dnl Now check whether -Wno-missing-field-initializers is needed
dnl for the { 0, } construct.
AC_CACHE_CHECK([whether -Wno-missing-field-initializers is needed],
[gl_cv_cc_nomfi_needed],
[gl_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -W -Werror"
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[int f (void)
{
typedef struct { int a; int b; } s_t;
s_t s1 = { 0, };
return s1.b;
}
]],
[[]])],
[gl_cv_cc_nomfi_needed=no],
[gl_cv_cc_nomfi_needed=yes])
CFLAGS="$gl_save_CFLAGS"
])
fi
dnl Next, check if -Werror -Wuninitialized is useful with the
dnl user's choice of $CFLAGS; some versions of gcc warn that it
dnl has no effect if -O is not also used
AC_CACHE_CHECK([whether -Wuninitialized is supported],
[gl_cv_cc_uninitialized_supported],
[gl_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror -Wuninitialized"
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[]], [[]])],
[gl_cv_cc_uninitialized_supported=yes],
[gl_cv_cc_uninitialized_supported=no])
CFLAGS="$gl_save_CFLAGS"
])
fi
# List all gcc warning categories.
# To compare this list to your installed GCC's, run this Bash command:
#
# comm -3 \
# <((sed -n 's/^ *\(-[^ 0-9][^ ]*\) .*/\1/p' manywarnings.m4; \
# awk '/^[^#]/ {print $1}' ../build-aux/gcc-warning.spec) | sort) \
# <(LC_ALL=C gcc --help=warnings | sed -n 's/^ \(-[^ ]*\) .*/\1/p' | sort)
gl_manywarn_set=
for gl_manywarn_item in -fno-common \
-W \
-Wabsolute-value \
-Waddress \
-Waddress-of-packed-member \
-Waggressive-loop-optimizations \
-Wall \
-Wattribute-warning \
-Wattributes \
-Wbad-function-cast \
-Wbool-compare \
-Wbool-operation \
-Wbuiltin-declaration-mismatch \
-Wbuiltin-macro-redefined \
-Wcannot-profile \
-Wcast-align \
-Wcast-align=strict \
-Wcast-function-type \
-Wchar-subscripts \
-Wclobbered \
-Wcomment \
-Wcomments \
-Wcoverage-mismatch \
-Wcpp \
-Wdangling-else \
-Wdate-time \
-Wdeprecated \
-Wdeprecated-declarations \
-Wdesignated-init \
-Wdisabled-optimization \
-Wdiscarded-array-qualifiers \
-Wdiscarded-qualifiers \
-Wdiv-by-zero \
-Wdouble-promotion \
-Wduplicated-branches \
-Wduplicated-cond \
-Wduplicate-decl-specifier \
-Wempty-body \
-Wendif-labels \
-Wenum-compare \
-Wexpansion-to-defined \
-Wextra \
-Wformat-contains-nul \
-Wformat-extra-args \
-Wformat-nonliteral \
-Wformat-security \
-Wformat-signedness \
-Wformat-y2k \
-Wformat-zero-length \
-Wframe-address \
-Wfree-nonheap-object \
-Whsa \
-Wif-not-aligned \
-Wignored-attributes \
-Wignored-qualifiers \
-Wimplicit \
-Wimplicit-function-declaration \
-Wimplicit-int \
-Wincompatible-pointer-types \
-Winit-self \
-Winline \
-Wint-conversion \
-Wint-in-bool-context \
-Wint-to-pointer-cast \
-Winvalid-memory-model \
-Winvalid-pch \
-Wlogical-not-parentheses \
-Wlogical-op \
-Wmain \
-Wmaybe-uninitialized \
-Wmemset-elt-size \
-Wmemset-transposed-args \
-Wmisleading-indentation \
-Wmissing-attributes \
-Wmissing-braces \
-Wmissing-declarations \
-Wmissing-field-initializers \
-Wmissing-include-dirs \
-Wmissing-parameter-type \
-Wmissing-profile \
-Wmissing-prototypes \
-Wmultichar \
-Wmultistatement-macros \
-Wnarrowing \
-Wnested-externs \
-Wnonnull \
-Wnonnull-compare \
-Wnull-dereference \
-Wodr \
-Wold-style-declaration \
-Wold-style-definition \
-Wopenmp-simd \
-Woverflow \
-Woverlength-strings \
-Woverride-init \
-Wpacked \
-Wpacked-bitfield-compat \
-Wpacked-not-aligned \
-Wparentheses \
-Wpointer-arith \
-Wpointer-compare \
-Wpointer-sign \
-Wpointer-to-int-cast \
-Wpragmas \
-Wpsabi \
-Wrestrict \
-Wreturn-local-addr \
-Wreturn-type \
-Wscalar-storage-order \
-Wsequence-point \
-Wshadow \
-Wshift-count-negative \
-Wshift-count-overflow \
-Wshift-negative-value \
-Wsizeof-array-argument \
-Wsizeof-pointer-div \
-Wsizeof-pointer-memaccess \
-Wstack-protector \
-Wstrict-aliasing \
-Wstrict-overflow \
-Wstrict-prototypes \
-Wstringop-truncation \
-Wsuggest-attribute=cold \
-Wsuggest-attribute=const \
-Wsuggest-attribute=format \
-Wsuggest-attribute=malloc \
-Wsuggest-attribute=noreturn \
-Wsuggest-attribute=pure \
-Wsuggest-final-methods \
-Wsuggest-final-types \
-Wswitch \
-Wswitch-bool \
-Wswitch-unreachable \
-Wsync-nand \
-Wsystem-headers \
-Wtautological-compare \
-Wtrampolines \
-Wtrigraphs \
-Wtype-limits \
-Wuninitialized \
-Wunknown-pragmas \
-Wunsafe-loop-optimizations \
-Wunused \
-Wunused-but-set-parameter \
-Wunused-but-set-variable \
-Wunused-function \
-Wunused-label \
-Wunused-local-typedefs \
-Wunused-macros \
-Wunused-parameter \
-Wunused-result \
-Wunused-value \
-Wunused-variable \
-Wvarargs \
-Wvariadic-macros \
-Wvector-operation-performance \
-Wvla \
-Wvolatile-register-var \
-Wwrite-strings \
\
; do
gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
done
# gcc --help=warnings outputs an unusual form for these options; list
# them here so that the above 'comm' command doesn't report a false match.
# Would prefer "min (PTRDIFF_MAX, SIZE_MAX)", but it must be a literal.
# Also, AC_COMPUTE_INT requires it to fit in a long; it is 2**63 on
# the only platforms where it does not fit in a long, so make that
# a special case.
AC_MSG_CHECKING([max safe object size])
AC_COMPUTE_INT([gl_alloc_max],
[LONG_MAX < (PTRDIFF_MAX < (size_t) -1 ? PTRDIFF_MAX : (size_t) -1)
? -1
: PTRDIFF_MAX < (size_t) -1 ? (long) PTRDIFF_MAX : (long) (size_t) -1],
[[#include <limits.h>
#include <stddef.h>
#include <stdint.h>
]],
[gl_alloc_max=2147483647])
case $gl_alloc_max in
-1) gl_alloc_max=9223372036854775807;;
esac
AC_MSG_RESULT([$gl_alloc_max])
gl_manywarn_set="$gl_manywarn_set -Walloc-size-larger-than=$gl_alloc_max"
gl_manywarn_set="$gl_manywarn_set -Warray-bounds=2"
gl_manywarn_set="$gl_manywarn_set -Wattribute-alias=2"
gl_manywarn_set="$gl_manywarn_set -Wformat-overflow=2"
gl_manywarn_set="$gl_manywarn_set -Wformat-truncation=2"
gl_manywarn_set="$gl_manywarn_set -Wimplicit-fallthrough=5"
gl_manywarn_set="$gl_manywarn_set -Wnormalized=nfc"
gl_manywarn_set="$gl_manywarn_set -Wshift-overflow=2"
gl_manywarn_set="$gl_manywarn_set -Wstringop-overflow=2"
gl_manywarn_set="$gl_manywarn_set -Wunused-const-variable=2"
gl_manywarn_set="$gl_manywarn_set -Wvla-larger-than=4031"
# These are needed for older GCC versions.
if test -n "$GCC"; then
case `($CC --version) 2>/dev/null` in
'gcc (GCC) '[[0-3]].* | \
'gcc (GCC) '4.[[0-7]].*)
gl_manywarn_set="$gl_manywarn_set -fdiagnostics-show-option"
gl_manywarn_set="$gl_manywarn_set -funit-at-a-time"
;;
esac
fi
# Disable specific options as needed.
if test "$gl_cv_cc_nomfi_needed" = yes; then
gl_manywarn_set="$gl_manywarn_set -Wno-missing-field-initializers"
fi
if test "$gl_cv_cc_uninitialized_supported" = no; then
gl_manywarn_set="$gl_manywarn_set -Wno-uninitialized"
fi
$1=$gl_manywarn_set
AC_LANG_POP([C])
])
# Specialization for _AC_LANG = C++.
# Use of m4_defun rather than AC_DEFUN works around a bug in autoconf < 2.63b.
m4_defun([gl_MANYWARN_ALL_GCC(C++)],
[
gl_MANYWARN_ALL_GCC_CXX_IMPL([$1])
])

115
m4/virt-warnings.m4 Normal file
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@ -0,0 +1,115 @@
# warnings.m4 serial 14
dnl Copyright (C) 2008-2020 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++])
])
# Specialization for _AC_LANG = Objective 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(Objective C)],
[
AC_LANG_PUSH([Objective C])
gl_UNKNOWN_WARNINGS_ARE_ERRORS_IMPL
AC_LANG_POP([Objective 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: