| 1 | # Autoconf include file defining macros related to compile-time warnings. |
| 2 | |
| 3 | # Copyright 2004, 2005, 2007, 2009 Free Software Foundation, Inc. |
| 4 | |
| 5 | #This file is part of GCC. |
| 6 | |
| 7 | #GCC is free software; you can redistribute it and/or modify it under |
| 8 | #the terms of the GNU General Public License as published by the Free |
| 9 | #Software Foundation; either version 3, or (at your option) any later |
| 10 | #version. |
| 11 | |
| 12 | #GCC is distributed in the hope that it will be useful, but WITHOUT |
| 13 | #ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 14 | #FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 15 | #for more details. |
| 16 | |
| 17 | #You should have received a copy of the GNU General Public License |
| 18 | #along with GCC; see the file COPYING3. If not see |
| 19 | #<http://www.gnu.org/licenses/>. |
| 20 | |
| 21 | # ACX_PROG_CC_WARNING_OPTS(WARNINGS, [VARIABLE = WARN_CFLAGS) |
| 22 | # Sets @VARIABLE@ to the subset of the given options which the |
| 23 | # compiler accepts. |
| 24 | AC_DEFUN([ACX_PROG_CC_WARNING_OPTS], |
| 25 | [AC_REQUIRE([AC_PROG_CC])dnl |
| 26 | m4_pushdef([acx_Var], [m4_default([$2], [WARN_CFLAGS])])dnl |
| 27 | AC_SUBST(acx_Var)dnl |
| 28 | m4_expand_once([acx_Var= |
| 29 | ],m4_quote(acx_Var=))dnl |
| 30 | save_CFLAGS="$CFLAGS" |
| 31 | for option in $1; do |
| 32 | AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option]) |
| 33 | AC_CACHE_CHECK([whether $CC supports $option], acx_Woption, |
| 34 | [CFLAGS="$option" |
| 35 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], |
| 36 | [AS_VAR_SET(acx_Woption, yes)], |
| 37 | [AS_VAR_SET(acx_Woption, no)]) |
| 38 | ]) |
| 39 | AS_IF([test AS_VAR_GET(acx_Woption) = yes], |
| 40 | [acx_Var="$acx_Var${acx_Var:+ }$option"]) |
| 41 | AS_VAR_POPDEF([acx_Woption])dnl |
| 42 | done |
| 43 | CFLAGS="$save_CFLAGS" |
| 44 | m4_popdef([acx_Var])dnl |
| 45 | ])# ACX_PROG_CC_WARNING_OPTS |
| 46 | |
| 47 | # ACX_PROG_CC_WARNING_ALMOST_PEDANTIC(WARNINGS, [VARIABLE = WARN_PEDANTIC) |
| 48 | # Append to VARIABLE "-pedantic" + the argument, if the compiler is GCC |
| 49 | # and accepts all of those options simultaneously, otherwise to nothing. |
| 50 | AC_DEFUN([ACX_PROG_CC_WARNING_ALMOST_PEDANTIC], |
| 51 | [AC_REQUIRE([AC_PROG_CC])dnl |
| 52 | m4_pushdef([acx_Var], [m4_default([$2], [WARN_PEDANTIC])])dnl |
| 53 | AC_SUBST(acx_Var)dnl |
| 54 | m4_expand_once([acx_Var= |
| 55 | ],m4_quote(acx_Var=))dnl |
| 56 | AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_$1])dnl |
| 57 | AS_IF([test "$GCC" = yes], |
| 58 | [AC_CACHE_CHECK([whether $CC supports -pedantic $1], acx_Pedantic, |
| 59 | [save_CFLAGS="$CFLAGS" |
| 60 | CFLAGS="-pedantic $1" |
| 61 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], |
| 62 | [AS_VAR_SET(acx_Pedantic, yes)], |
| 63 | [AS_VAR_SET(acx_Pedantic, no)]) |
| 64 | CFLAGS="$save_CFLAGS"]) |
| 65 | AS_IF([test AS_VAR_GET(acx_Pedantic) = yes], |
| 66 | [acx_Var="$acx_Var${acx_Var:+ }-pedantic $1"]) |
| 67 | ]) |
| 68 | AS_VAR_POPDEF([acx_Pedantic])dnl |
| 69 | m4_popdef([acx_Var])dnl |
| 70 | ])# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC |
| 71 | |
| 72 | # ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z], [VARIABLE = WERROR]) |
| 73 | # sets @VARIABLE@ to "-Werror" if the compiler is GCC >=x.y.z, or if |
| 74 | # --enable-werror-always was given on the command line, otherwise |
| 75 | # to nothing. |
| 76 | # If the argument is the word "manual" instead of a version number, |
| 77 | # then @VARIABLE@ will be set to -Werror only if --enable-werror-always |
| 78 | # appeared on the configure command line. |
| 79 | AC_DEFUN([ACX_PROG_CC_WARNINGS_ARE_ERRORS], |
| 80 | [AC_REQUIRE([AC_PROG_CC])dnl |
| 81 | m4_pushdef([acx_Var], [m4_default([$2], [WERROR])])dnl |
| 82 | AC_SUBST(acx_Var)dnl |
| 83 | m4_expand_once([acx_Var= |
| 84 | ],m4_quote(acx_Var=))dnl |
| 85 | AC_ARG_ENABLE(werror-always, |
| 86 | AS_HELP_STRING([--enable-werror-always], |
| 87 | [enable -Werror despite compiler version]), |
| 88 | [], [enable_werror_always=no]) |
| 89 | AS_IF([test $enable_werror_always = yes], |
| 90 | [acx_Var="$acx_Var${acx_Var:+ }-Werror"]) |
| 91 | m4_if($1, [manual],, |
| 92 | [AS_VAR_PUSHDEF([acx_GCCvers], [acx_cv_prog_cc_gcc_$1_or_newer])dnl |
| 93 | AC_CACHE_CHECK([whether $CC is GCC >=$1], acx_GCCvers, |
| 94 | [set fnord `echo $1 | tr '.' ' '` |
| 95 | shift |
| 96 | AC_PREPROC_IFELSE( |
| 97 | [#if __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ \ |
| 98 | < [$]1 * 10000 + [$]2 * 100 + [$]3 |
| 99 | #error insufficient |
| 100 | #endif], |
| 101 | [AS_VAR_SET(acx_GCCvers, yes)], |
| 102 | [AS_VAR_SET(acx_GCCvers, no)])]) |
| 103 | AS_IF([test AS_VAR_GET(acx_GCCvers) = yes], |
| 104 | [acx_Var="$acx_Var${acx_Var:+ }-Werror"]) |
| 105 | AS_VAR_POPDEF([acx_GCCvers])]) |
| 106 | m4_popdef([acx_Var])dnl |
| 107 | ])# ACX_PROG_CC_WARNINGS_ARE_ERRORS |