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83 lines
2.9 KiB
83 lines
2.9 KiB
# warnings.m4 serial 11 |
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# modified for strace project |
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dnl Copyright (C) 2008-2013 Free Software Foundation, Inc. |
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dnl This file is free software; the Free Software Foundation |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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dnl From Simon Josefsson |
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# gl_AS_VAR_APPEND(VAR, VALUE) |
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# ---------------------------- |
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# Provide the functionality of AS_VAR_APPEND if Autoconf does not have it. |
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m4_ifdef([AS_VAR_APPEND], |
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[m4_copy([AS_VAR_APPEND], [gl_AS_VAR_APPEND])], |
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[m4_define([gl_AS_VAR_APPEND], |
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[AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])]) |
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# gl_COMPILER_OPTION_IF(OPTION, [IF-SUPPORTED], [IF-NOT-SUPPORTED], |
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# [PROGRAM = AC_LANG_PROGRAM()]) |
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# ----------------------------------------------------------------- |
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# Check if the compiler supports OPTION when compiling PROGRAM. |
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# |
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# FIXME: gl_Warn must be used unquoted until we can assume Autoconf |
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# 2.64 or newer. |
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AC_DEFUN([gl_COMPILER_OPTION_IF], |
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[AS_VAR_PUSHDEF([gl_Flags], _AC_LANG_PREFIX[]FLAGS)dnl |
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AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]gl_Flags[]_$1])dnl |
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AS_LITERAL_IF([$1], |
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[m4_pushdef([gl_Positive], m4_bpatsubst([$1], [^-Wno-], [-W]))], |
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[gl_positive="$1" |
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case $gl_positive in |
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-Wno-*) gl_positive=-W`expr "X$gl_positive" : 'X-Wno-\(.*\)'` ;; |
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esac |
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m4_pushdef([gl_Positive], [$gl_positive])])dnl |
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AC_CACHE_CHECK([whether $[]_AC_CC[] handles $1], m4_defn([gl_Warn]), [ |
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gl_save_compiler_FLAGS="$gl_Flags" |
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gl_AS_VAR_APPEND(m4_defn([gl_Flags]), |
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[" $gl_unknown_warnings_are_errors ]m4_defn([gl_Positive])["]) |
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AC_LINK_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])], |
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[AS_VAR_SET(gl_Warn, [yes])], |
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[AS_VAR_SET(gl_Warn, [no])]) |
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gl_Flags="$gl_save_compiler_FLAGS" |
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]) |
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AS_VAR_IF(gl_Warn, [yes], [$2], [$3]) |
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m4_popdef([gl_Positive])dnl |
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AS_VAR_POPDEF([gl_Flags])dnl |
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AS_VAR_POPDEF([gl_Warn])dnl |
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]) |
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# gl_UNKNOWN_WARNINGS_ARE_ERRORS |
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# ------------------------------ |
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# Clang doesn't complain about unknown warning options unless one also |
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# specifies -Wunknown-warning-option -Werror. Detect this. |
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AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS], |
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[AS_IF([test x${gl_unknown_warnings_are_errors+set} = x], |
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[gl_COMPILER_OPTION_IF([-Werror -Wunknown-warning-option], |
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[gl_unknown_warnings_are_errors='-Wunknown-warning-option -Werror'], |
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[gl_unknown_warnings_are_errors=]) |
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]) |
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]) |
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# gl_WARN_ADD(OPTION, [VARIABLE = WARN_CFLAGS], |
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# [PROGRAM = AC_LANG_PROGRAM()]) |
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# --------------------------------------------- |
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# Adds parameter to WARN_CFLAGS if the compiler supports it when |
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# compiling PROGRAM. For example, gl_WARN_ADD([-Wparentheses]). |
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# |
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# If VARIABLE is a variable name, AC_SUBST it. |
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AC_DEFUN([gl_WARN_ADD], |
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[gl_UNKNOWN_WARNINGS_ARE_ERRORS |
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gl_COMPILER_OPTION_IF([$1], |
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[gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])], |
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[], |
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[$3]) |
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m4_ifval([$2], |
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[AS_LITERAL_IF([$2], [AC_SUBST([$2])])], |
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[AC_SUBST([WARN_CFLAGS])])dnl |
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]) |
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# Local Variables: |
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# mode: autoconf |
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# End:
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