1 # warnings.m4 serial 7 2 dnl Copyright (C) 2008-2012 Free Software Foundation, Inc. 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 28 AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [ 29 gl_save_compiler_FLAGS="$gl_Flags" 30 gl_AS_VAR_APPEND(m4_defn([gl_Flags]), [" $1"]) 31 AC_COMPILE_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])], 32 [AS_VAR_SET(gl_Warn, [yes])], 33 [AS_VAR_SET(gl_Warn, [no])]) 34 gl_Flags="$gl_save_compiler_FLAGS" 35 ]) 36 AS_VAR_IF(gl_Warn, [yes], [$2], [$3]) 37 AS_VAR_POPDEF([gl_Flags])dnl 38 AS_VAR_POPDEF([gl_Warn])dnl 39 ]) 40 41 42 # gl_WARN_ADD(OPTION, [VARIABLE = WARN_CFLAGS], 43 # [PROGRAM = AC_LANG_PROGRAM()]) 44 # --------------------------------------------- 45 # Adds parameter to WARN_CFLAGS if the compiler supports it when 46 # compiling PROGRAM. For example, gl_WARN_ADD([-Wparentheses]). 47 # 48 # If VARIABLE is a variable name, AC_SUBST it. 49 AC_DEFUN([gl_WARN_ADD], 50 [gl_COMPILER_OPTION_IF([$1], 51 [gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])], 52 [], 53 [$3]) 54 m4_ifval([$2], 55 [AS_LITERAL_IF([$2], [AC_SUBST([$2])])], 56 [AC_SUBST([WARN_CFLAGS])])dnl 57 ]) 58 59 # Local Variables: 60 # mode: autoconf 61 # End: 62
