# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_cflags_force_c89.html # =========================================================================== # # SYNOPSIS # # AX_CFLAGS_FORCE_C89 [(shellvar [,default, [A/NA]])] # # DESCRIPTION # # Try to find a compiler option that enables strict C89 mode. # # For the GNU CC compiler it will be -ansi -pedantic. The result is added # to the shellvar being CFLAGS by default. # # Currently this macro knows about GCC, Solaris C compiler, Digital Unix C # compiler, C for AIX Compiler, HP-UX C compiler, IRIX C compiler, NEC # SX-5 (Super-UX 10) C compiler, and Cray J90 (Unicos 10.0.0.8) C # compiler. # # - $1 shell-variable-to-add-to : CFLAGS # - $2 add-value-if-not-found : nothing # - $3 action-if-found : add value to shellvariable # - $4 action-if-not-found : nothing # # NOTE: These macros depend on AX_APPEND_FLAG. # # LICENSE # # Copyright (c) 2009 Guido U. Draheim # # Copying and distribution of this file, with or without modification, are # permitted in any medium without royalty provided the copyright notice # and this notice are preserved. This file is offered as-is, without any # warranty. #serial 12 AC_DEFUN([AX_CFLAGS_FORCE_C89],[dnl AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_force_c89])dnl AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for C89 mode], VAR,[VAR="no, unknown" AC_LANG_PUSH([C]) ac_save_[]FLAGS="$[]FLAGS" for ac_arg dnl in "-pedantic % -ansi -pedantic" dnl GCC "-xstrconst % -v -Xc" dnl Solaris C "-std1 % -std1" dnl Digital Unix " % -qlanglvl=ansi" dnl AIX " % -ansi -ansiE" dnl IRIX "+ESlit % -Aa" dnl HP-UX C "-Xc % -Xc" dnl NEC SX-5 (Super-UX 10) "-h conform % -h conform" dnl Cray C (Unicos) # do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[return 0;]])], [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break],[]) done FLAGS="$ac_save_[]FLAGS" AC_LANG_POP([C]) ]) AS_VAR_POPDEF([FLAGS])dnl AX_REQUIRE_DEFINED([AX_APPEND_FLAG]) case ".$VAR" in .ok|.ok,*) m4_ifvaln($3,$3) ;; .|.no|.no,*) m4_default($4,[m4_ifval($2,[AX_APPEND_FLAG([$2], [$1])])]) ;; *) m4_default($3,[AX_APPEND_FLAG([$VAR], [$1])]) ;; esac AS_VAR_POPDEF([VAR])dnl ])