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AX_CFLAGS_STRICT_PROTOTYPES [(shellvar)]
1.1 (2003/01/06) guidod @ ac-archive-0.5.39
Guido Draheim <guidod@gmx.de>
Try to find a compiler option that requires strict prototypes.
The sanity check is done by looking at sys/signal.h which has a set of macro-definitions SIG_DFL and SIG_IGN that are cast to the local signal-handler type. If that signal-handler type is not fully qualified then the system headers are not seen as strictly prototype clean.
For the GNU CC compiler it will be -fstrict-prototypes -Wstrict-prototypes The result is added to the shellvar being CFLAGS by default.
AC_DEFUN([AX_CFLAGS_STRICT_PROTOTYPES], [AC_MSG_CHECKING(m4_ifval($1,$1,CFLAGS) for strict prototypes) AC_CACHE_VAL(ac_cv_cflags_strict_prototypes, [ac_cv_cflags_strict_prototypes="no, unknown" AC_LANG_SAVE AC_LANG_C ac_save_CFLAGS="$CFLAGS" for ac_arg dnl in "-Wall % -fstrict-prototypes -Wstrict-prototypes" dnl GCC "-Wall % -Wstrict-prototypes" dnl try to warn atleast # do CFLAGS="$ac_save_CFLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` AC_TRY_COMPILE([],[return 0;], [ac_cv_cflags_strict_prototypes=`echo $ac_arg | sed -e 's,.*% *,,'` break]) done case "$ac_cv_cflags_strict_prototypes" in no,*) ;; *) AC_TRY_COMPILE( [#include <sys/signal.h>],[ if (signal (SIGINT, SIG_IGN) == SIG_DFL) return 1;],[], [ac_cv_cflags_strict_prototypes="no, suppressed, sys/signal.h" cp conftest.c testtest.c ]) ;; esac CFLAGS="$ac_save_CFLAGS" AC_LANG_RESTORE ]) case ".$ac_cv_cflags_strict_prototypes" in .|.no,*) AC_MSG_RESULT($ac_cv_cflags_strict_prototypes) ;; *) m4_ifval($1,$1,CFLAGS)="$m4_ifval($1,$1,CFLAGS) dnl $ac_cv_cflags_strict_prototypes" AC_MSG_RESULT($ac_cv_cflags_strict_prototypes) ;; esac]) dnl the only difference - the LANG selection... and the default FLAGS AC_DEFUN([AX_CXXFLAGS_STRICT_PROTOTYPES], [AC_MSG_CHECKING(m4_ifval($1,$1,CXXFLAGS) for strict prototypes) AC_CACHE_VAL(ac_cv_cxxflags_strict_prototypes, [ac_cv_cxxflags_strict_prototypes="no, unknown" AC_LANG_SAVE AC_LANG_CXX ac_save_CXXFLAGS="$CXXFLAGS" for ac_arg dnl in "-Wall % -fstrict-prototypes -Wstrict-prototypes" dnl GCC "-Wall % -Wstrict-prototypes" dnl try to warn atleast # do CXXFLAGS="$ac_save_CXXFLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'` AC_TRY_COMPILE([],[return 0;], [ac_cv_cxxflags_strict_prototypes=`echo $ac_arg | sed -e 's,.*% *,,'` break]) done case "$ac_cv_cxxflags_strict_prototypes" in no,*) ;; *) AC_TRY_COMPILE( [#include <sys/signal.h>],[ if (signal (SIGINT, SIG_IGN) == SIG_DFL) return 1;],[], [ac_cv_cxxflags_strict_prototypes="no, suppressed, sys/signal.h" cp conftest.c testtest.c ]) ;; esac CXXFLAGS="$ac_save_CXXFLAGS" AC_LANG_RESTORE ]) case ".$ac_cv_cxxflags_strict_prototypes" in .|.no,*) AC_MSG_RESULT($ac_cv_cxxflags_strict_prototypes) ;; *) m4_ifval($1,$1,CXXFLAGS)="$m4_ifval($1,$1,CXXFLAGS) dnl $ac_cv_cxxflags_strict_prototypes" AC_MSG_RESULT($ac_cv_cxxflags_strict_prototypes) ;; esac])