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annotate m4/warnings.m4 @ 17474:88b6cb053cd7

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warnings: minor optimization Paul Eggert suggested that expr is more efficient than echo|sed. * m4/warnings.m4 (gl_COMPILER_OPTION_IF): Use fewer processes. Signed-off-by: Eric Blake <eblake@redhat.com>
author Eric Blake <eblake@redhat.com>
date Thu, 15 Aug 2013 13:45:55 -0600
parents 1175d52f956a
children
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1 # warnings.m4 serial 10
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2 dnl Copyright (C) 2008-2013 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 dnl From Simon Josefsson
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8
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9 # gl_AS_VAR_APPEND(VAR, VALUE)
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10 # ----------------------------
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11 # Provide the functionality of AS_VAR_APPEND if Autoconf does not have it.
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12 m4_ifdef([AS_VAR_APPEND],
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13 [m4_copy([AS_VAR_APPEND], [gl_AS_VAR_APPEND])],
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14 [m4_define([gl_AS_VAR_APPEND],
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15 [AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])])
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16
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17
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18 # gl_COMPILER_OPTION_IF(OPTION, [IF-SUPPORTED], [IF-NOT-SUPPORTED],
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19 # [PROGRAM = AC_LANG_PROGRAM()])
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20 # -----------------------------------------------------------------
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21 # Check if the compiler supports OPTION when compiling PROGRAM.
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22 #
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23 # FIXME: gl_Warn must be used unquoted until we can assume Autoconf
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24 # 2.64 or newer.
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25 AC_DEFUN([gl_COMPILER_OPTION_IF],
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26 [AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl
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27 AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl
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28 AS_LITERAL_IF([$1],
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29 [m4_pushdef([gl_Positive], m4_bpatsubst([$1], [^-Wno-], [-W]))],
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30 [gl_positive="$1"
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31 case $gl_positive in
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32 -Wno-*) gl_positive=-W`expr "X$gl_positive" : 'X-Wno-\(.*\)'` ;;
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33 esac
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34 m4_pushdef([gl_Positive], [$gl_positive])])dnl
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35 AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [
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36 gl_save_compiler_FLAGS="$gl_Flags"
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37 gl_AS_VAR_APPEND(m4_defn([gl_Flags]),
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38 [" $gl_unknown_warnings_are_errors ]m4_defn([gl_Positive])["])
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39 AC_COMPILE_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])],
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40 [AS_VAR_SET(gl_Warn, [yes])],
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41 [AS_VAR_SET(gl_Warn, [no])])
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42 gl_Flags="$gl_save_compiler_FLAGS"
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43 ])
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44 AS_VAR_IF(gl_Warn, [yes], [$2], [$3])
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45 m4_popdef([gl_Positive])dnl
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46 AS_VAR_POPDEF([gl_Flags])dnl
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47 AS_VAR_POPDEF([gl_Warn])dnl
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48 ])
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49
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50 # gl_UNKNOWN_WARNINGS_ARE_ERRORS
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51 # ------------------------------
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52 # Clang doesn't complain about unknown warning options unless one also
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53 # specifies -Wunknown-warning-option -Werror. Detect this.
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54 AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS],
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55 [gl_COMPILER_OPTION_IF([-Werror -Wunknown-warning-option],
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56 [gl_unknown_warnings_are_errors='-Wunknown-warning-option -Werror'],
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57 [gl_unknown_warnings_are_errors=])])
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58
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59 # gl_WARN_ADD(OPTION, [VARIABLE = WARN_CFLAGS],
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60 # [PROGRAM = AC_LANG_PROGRAM()])
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61 # ---------------------------------------------
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62 # Adds parameter to WARN_CFLAGS if the compiler supports it when
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63 # compiling PROGRAM. For example, gl_WARN_ADD([-Wparentheses]).
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64 #
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65 # If VARIABLE is a variable name, AC_SUBST it.
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66 AC_DEFUN([gl_WARN_ADD],
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67 [AC_REQUIRE([gl_UNKNOWN_WARNINGS_ARE_ERRORS])
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68 gl_COMPILER_OPTION_IF([$1],
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69 [gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])],
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70 [],
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71 [$3])
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72 m4_ifval([$2],
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73 [AS_LITERAL_IF([$2], [AC_SUBST([$2])])],
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74 [AC_SUBST([WARN_CFLAGS])])dnl
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75 ])
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76
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77 # Local Variables:
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78 # mode: autoconf
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79 # End: