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709640a5 RK |
1 | # warnings.m4 serial 11 |
2 | dnl Copyright (C) 2008-2015 Free Software Foundation, Inc. | |
d6e5e940 AT |
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 | ||
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 | ||
18 | # gl_COMPILER_OPTION_IF(OPTION, [IF-SUPPORTED], [IF-NOT-SUPPORTED], | |
19 | # [PROGRAM = AC_LANG_PROGRAM()]) | |
20 | # ----------------------------------------------------------------- | |
21 | # Check if the compiler supports OPTION when compiling PROGRAM. | |
22 | # | |
23 | # FIXME: gl_Warn must be used unquoted until we can assume Autoconf | |
24 | # 2.64 or newer. | |
25 | AC_DEFUN([gl_COMPILER_OPTION_IF], | |
26 | [AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl | |
27 | AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl | |
709640a5 RK |
28 | AS_LITERAL_IF([$1], |
29 | [m4_pushdef([gl_Positive], m4_bpatsubst([$1], [^-Wno-], [-W]))], | |
30 | [gl_positive="$1" | |
31 | case $gl_positive in | |
32 | -Wno-*) gl_positive=-W`expr "X$gl_positive" : 'X-Wno-\(.*\)'` ;; | |
33 | esac | |
34 | m4_pushdef([gl_Positive], [$gl_positive])])dnl | |
d6e5e940 AT |
35 | AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [ |
36 | gl_save_compiler_FLAGS="$gl_Flags" | |
709640a5 RK |
37 | gl_AS_VAR_APPEND(m4_defn([gl_Flags]), |
38 | [" $gl_unknown_warnings_are_errors ]m4_defn([gl_Positive])["]) | |
39 | AC_LINK_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])], | |
40 | [AS_VAR_SET(gl_Warn, [yes])], | |
41 | [AS_VAR_SET(gl_Warn, [no])]) | |
d6e5e940 AT |
42 | gl_Flags="$gl_save_compiler_FLAGS" |
43 | ]) | |
44 | AS_VAR_IF(gl_Warn, [yes], [$2], [$3]) | |
709640a5 | 45 | m4_popdef([gl_Positive])dnl |
d6e5e940 AT |
46 | AS_VAR_POPDEF([gl_Flags])dnl |
47 | AS_VAR_POPDEF([gl_Warn])dnl | |
48 | ]) | |
49 | ||
50 | # gl_UNKNOWN_WARNINGS_ARE_ERRORS | |
51 | # ------------------------------ | |
52 | # Clang doesn't complain about unknown warning options unless one also | |
53 | # specifies -Wunknown-warning-option -Werror. Detect this. | |
54 | AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS], | |
55 | [gl_COMPILER_OPTION_IF([-Werror -Wunknown-warning-option], | |
56 | [gl_unknown_warnings_are_errors='-Wunknown-warning-option -Werror'], | |
57 | [gl_unknown_warnings_are_errors=])]) | |
58 | ||
59 | # gl_WARN_ADD(OPTION, [VARIABLE = WARN_CFLAGS], | |
60 | # [PROGRAM = AC_LANG_PROGRAM()]) | |
61 | # --------------------------------------------- | |
62 | # Adds parameter to WARN_CFLAGS if the compiler supports it when | |
63 | # compiling PROGRAM. For example, gl_WARN_ADD([-Wparentheses]). | |
64 | # | |
65 | # If VARIABLE is a variable name, AC_SUBST it. | |
66 | AC_DEFUN([gl_WARN_ADD], | |
67 | [AC_REQUIRE([gl_UNKNOWN_WARNINGS_ARE_ERRORS]) | |
68 | gl_COMPILER_OPTION_IF([$1], | |
69 | [gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])], | |
70 | [], | |
71 | [$3]) | |
72 | m4_ifval([$2], | |
73 | [AS_LITERAL_IF([$2], [AC_SUBST([$2])])], | |
74 | [AC_SUBST([WARN_CFLAGS])])dnl | |
75 | ]) | |
76 | ||
77 | # Local Variables: | |
78 | # mode: autoconf | |
79 | # End: |