diff options
Diffstat (limited to 'Build/source/libs/zziplib/zziplib-0.13.62/m4/ax_cflags_no_writable_strings.m4')
-rw-r--r-- | Build/source/libs/zziplib/zziplib-0.13.62/m4/ax_cflags_no_writable_strings.m4 | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/Build/source/libs/zziplib/zziplib-0.13.62/m4/ax_cflags_no_writable_strings.m4 b/Build/source/libs/zziplib/zziplib-0.13.62/m4/ax_cflags_no_writable_strings.m4 new file mode 100644 index 00000000000..db9997ea6fd --- /dev/null +++ b/Build/source/libs/zziplib/zziplib-0.13.62/m4/ax_cflags_no_writable_strings.m4 @@ -0,0 +1,145 @@ +dnl /usr/share/aclocal/guidod-cvs/ax_cflags_no_writable_strings.m4 +dnl @synopsis AX_CFLAGS_NO_WRITABLE_STRINGS [(shellvar [,default, [A/NA]])] +dnl +dnl Try to find a compiler option that makes all stringliteral +dnl readonly. +dnl +dnl The sanity check is done by looking at string.h which has a set of +dnl strcpy definitions that should be defined with const-modifiers to +dnl not emit a warning in all so many places. +dnl +dnl For the GNU CC compiler it will be -fno-writable-strings +dnl -Wwrite-strings The result is added to the shellvar being CFLAGS by +dnl default. +dnl +dnl DEFAULTS: +dnl +dnl - $1 shell-variable-to-add-to : CFLAGS +dnl - $2 add-value-if-not-found : nothing +dnl - $3 action-if-found : add value to shellvariable +dnl - $4 action-if-not-found : nothing +dnl +dnl @category C +dnl @author Guido U. Draheim <guidod@gmx.de> +dnl @version 2006-12-12 +dnl @license GPLWithACException + +AC_DEFUN([AX_CFLAGS_NO_WRITABLE_STRINGS],[dnl +AS_VAR_PUSHDEF([FLAGS],[CFLAGS])dnl +AS_VAR_PUSHDEF([VAR],[ac_cv_cflags_no_writable_strings])dnl +AC_CACHE_CHECK([m4_ifval([$1],[$1],FLAGS) making strings readonly], +VAR,[VAR="no, unknown" + AC_LANG_SAVE + AC_LANG_C + ac_save_[]FLAGS="$[]FLAGS" +# IRIX C compiler: +# -use_readonly_const is the default for IRIX C, +# puts them into .rodata, but they are copied later. +# need to be "-G0 -rdatashared" for strictmode but +# I am not sure what effect that has really. - guidod +for ac_arg dnl +in "-pedantic % -fno-writable-strings -Wwrite-strings" dnl GCC + "-pedantic % -fconst-strings -Wwrite-strings" dnl newer GCC + "-v -Xc % -xstrconst" dnl Solaris C - strings go into readonly segment + "+w1 -Aa % +ESlit" dnl HP-UX C - strings go into readonly segment + "-w0 -std1 % -readonly_strings" dnl Digital Unix - again readonly segment + "-fullwarn -use_readonly_const %% ok, its the default" dnl IRIX C + # +do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` + AC_TRY_COMPILE([],[return 0;], + [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break]) +done +case ".$VAR" in + .|.no|.no,*) ;; + *) # sanity check - testing strcpy() from string.h + cp config.log config.tmp + AC_TRY_COMPILE([#include <string.h>],[ + char test[16]; + if (strcpy (test, "test")) return 1;], + dnl the original did use test -n `$CC testprogram.c` + [if test `diff config.log config.tmp | grep -i warning | wc -l` != 0 + then VAR="no, suppressed, string.h," ; fi], + [VAR="no, suppressed, string.h"]) + rm config.tmp + ;; +esac + FLAGS="$ac_save_[]FLAGS" + AC_LANG_RESTORE +]) +case ".$VAR" in + .ok|.ok,*) m4_ifvaln($3,$3) ;; + .|.no|.no,*) m4_ifvaln($4,$4,[m4_ifval($2,[ + AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"]) + m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])]) ;; + *) m4_ifvaln($3,$3,[ + if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null + then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR]) + else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"]) + m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR" + fi ]) ;; +esac +AS_VAR_POPDEF([VAR])dnl +AS_VAR_POPDEF([FLAGS])dnl +]) + +dnl the only difference - the LANG selection... and the default FLAGS + +AC_DEFUN([AX_CXXFLAGS_NO_WRITABLE_STRINGS],[dnl +AS_VAR_PUSHDEF([FLAGS],[CXXFLAGS])dnl +AS_VAR_PUSHDEF([VAR],[ac_cv_cxxflags_no_writable_strings])dnl +AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) making strings readonly], +VAR,[VAR="no, unknown" + AC_LANG_SAVE + AC_LANG_CPLUSPLUS + ac_save_[]FLAGS="$[]FLAGS" +# IRIX C compiler: +# -use_readonly_const is the default for IRIX C, +# puts them into .rodata, but they are copied later. +# need to be "-G0 -rdatashared" for strictmode but +# I am not sure what effect that has really. - guidod +for ac_arg dnl +in "-pedantic -Werror % -fno-writable-strings -Wwrite-strings" dnl GCC + "-pedantic -Werror % -fconst-strings -Wwrite-strings" dnl newer GCC + "-pedantic % -fconst-strings %% no, const-strings is default" dnl newer GCC + "-v -Xc % -xstrconst" dnl Solaris C - strings go into readonly segment + "+w1 -Aa % +ESlit" dnl HP-UX C - strings go into readonly segment + "-w0 -std1 % -readonly_strings" dnl Digital Unix - again readonly segment + "-fullwarn -use_readonly_const %% ok, its the default" dnl IRIX C + # +do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` + AC_TRY_COMPILE([],[return 0;], + [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break]) +done +case ".$VAR" in + .|.no|.no,*) ;; + *) # sanity check - testing strcpy() from string.h + cp config.log config.tmp + AC_TRY_COMPILE([#include <string.h>],[ + char test[16]; + if (strcpy (test, "test")) return 1;], + dnl the original did use test -n `$CC testprogram.c` + [if test `diff config.log config.tmp | grep -i warning | wc -l` != 0 + then VAR="no, suppressed, string.h," ; fi], + [VAR="no, suppressed, string.h"]) + rm config.tmp + ;; +esac + FLAGS="$ac_save_[]FLAGS" + AC_LANG_RESTORE +]) +case ".$VAR" in + .ok|.ok,*) m4_ifvaln($3,$3) ;; + .|.no|.no,*) m4_ifvaln($4,$4,[m4_ifval($2,[ + AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"]) + m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $2"])]) ;; + *) m4_ifvaln($3,$3,[ + if echo " $[]m4_ifval($1,$1,FLAGS) " | grep " $VAR " 2>&1 >/dev/null + then AC_RUN_LOG([: m4_ifval($1,$1,FLAGS) does contain $VAR]) + else AC_RUN_LOG([: m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR"]) + m4_ifval($1,$1,FLAGS)="$m4_ifval($1,$1,FLAGS) $VAR" + fi ]) ;; +esac +AS_VAR_POPDEF([VAR])dnl +AS_VAR_POPDEF([FLAGS])dnl +]) + |