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35428fb6 | 1 | # warnings.m4 serial 5 |
f0007cad | 2 | dnl Copyright (C) 2008-2012 Free Software Foundation, Inc. |
f29ded4b LC |
3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
7 | dnl From Simon Josefsson | |
8 | ||
f29ded4b LC |
9 | # gl_AS_VAR_APPEND(VAR, VALUE) |
10 | # ---------------------------- | |
11 | # Provide the functionality of AS_VAR_APPEND if Autoconf does not have it. | |
12 | m4_ifdef([AS_VAR_APPEND], | |
13 | [m4_copy([AS_VAR_APPEND], [gl_AS_VAR_APPEND])], | |
14 | [m4_define([gl_AS_VAR_APPEND], | |
15 | [AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])]) | |
16 | ||
17 | # gl_WARN_ADD(PARAMETER, [VARIABLE = WARN_CFLAGS]) | |
18 | # ------------------------------------------------ | |
19 | # Adds parameter to WARN_CFLAGS if the compiler supports it. For example, | |
20 | # gl_WARN_ADD([-Wparentheses]). | |
21 | AC_DEFUN([gl_WARN_ADD], | |
35428fb6 LC |
22 | dnl FIXME: gl_Warn must be used unquoted until we can assume |
23 | dnl autoconf 2.64 or newer. | |
f29ded4b | 24 | [AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_$1])dnl |
35428fb6 | 25 | AC_CACHE_CHECK([whether compiler handles $1], m4_defn([gl_Warn]), [ |
3d458a81 | 26 | gl_save_CPPFLAGS="$CPPFLAGS" |
f29ded4b LC |
27 | CPPFLAGS="${CPPFLAGS} $1" |
28 | AC_PREPROC_IFELSE([AC_LANG_PROGRAM([])], | |
35428fb6 LC |
29 | [AS_VAR_SET(gl_Warn, [yes])], |
30 | [AS_VAR_SET(gl_Warn, [no])]) | |
3d458a81 | 31 | CPPFLAGS="$gl_save_CPPFLAGS" |
f29ded4b | 32 | ]) |
35428fb6 LC |
33 | AS_VAR_IF(gl_Warn, [yes], |
34 | [gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])]) | |
f29ded4b LC |
35 | AS_VAR_POPDEF([gl_Warn])dnl |
36 | m4_ifval([$2], [AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])])dnl | |
37 | ]) |