diff options
Diffstat (limited to 'm4/warnings.m4')
| -rw-r--r-- | m4/warnings.m4 | 32 |
1 files changed, 25 insertions, 7 deletions
diff --git a/m4/warnings.m4 b/m4/warnings.m4 index 4b2ac3850..43156f450 100644 --- a/m4/warnings.m4 +++ b/m4/warnings.m4 @@ -1,5 +1,5 @@ -# warnings.m4 serial 7 -dnl Copyright (C) 2008-2013 Free Software Foundation, Inc. +# warnings.m4 serial 11 +dnl Copyright (C) 2008-2014 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. @@ -25,19 +25,36 @@ m4_ifdef([AS_VAR_APPEND], AC_DEFUN([gl_COMPILER_OPTION_IF], [AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl +AS_LITERAL_IF([$1], + [m4_pushdef([gl_Positive], m4_bpatsubst([$1], [^-Wno-], [-W]))], + [gl_positive="$1" +case $gl_positive in + -Wno-*) gl_positive=-W`expr "X$gl_positive" : 'X-Wno-\(.*\)'` ;; +esac +m4_pushdef([gl_Positive], [$gl_positive])])dnl AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [ gl_save_compiler_FLAGS="$gl_Flags" - gl_AS_VAR_APPEND(m4_defn([gl_Flags]), [" $1"]) - AC_COMPILE_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])], - [AS_VAR_SET(gl_Warn, [yes])], - [AS_VAR_SET(gl_Warn, [no])]) + gl_AS_VAR_APPEND(m4_defn([gl_Flags]), + [" $gl_unknown_warnings_are_errors ]m4_defn([gl_Positive])["]) + AC_LINK_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])], + [AS_VAR_SET(gl_Warn, [yes])], + [AS_VAR_SET(gl_Warn, [no])]) gl_Flags="$gl_save_compiler_FLAGS" ]) AS_VAR_IF(gl_Warn, [yes], [$2], [$3]) +m4_popdef([gl_Positive])dnl AS_VAR_POPDEF([gl_Flags])dnl AS_VAR_POPDEF([gl_Warn])dnl ]) +# gl_UNKNOWN_WARNINGS_ARE_ERRORS +# ------------------------------ +# Clang doesn't complain about unknown warning options unless one also +# specifies -Wunknown-warning-option -Werror. Detect this. +AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS], +[gl_COMPILER_OPTION_IF([-Werror -Wunknown-warning-option], + [gl_unknown_warnings_are_errors='-Wunknown-warning-option -Werror'], + [gl_unknown_warnings_are_errors=])]) # gl_WARN_ADD(OPTION, [VARIABLE = WARN_CFLAGS], # [PROGRAM = AC_LANG_PROGRAM()]) @@ -47,7 +64,8 @@ AS_VAR_POPDEF([gl_Warn])dnl # # If VARIABLE is a variable name, AC_SUBST it. AC_DEFUN([gl_WARN_ADD], -[gl_COMPILER_OPTION_IF([$1], +[AC_REQUIRE([gl_UNKNOWN_WARNINGS_ARE_ERRORS]) +gl_COMPILER_OPTION_IF([$1], [gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])], [], [$3]) |