-dnl TEMPORARY probe on buildbot
-uname -a
-find /opt -name cc
-
-AC_CACHE_CHECK([whether compiler supports -Wextra], [nmh_cv_has_wextra],
-[nmh_saved_cflags="$CFLAGS"
- CFLAGS="$CFLAGS -Wextra -Werror"
- AC_TRY_COMPILE([],[],nmh_cv_has_wextra=yes,nmh_cv_has_wextra=no)
- CFLAGS="$nmh_saved_cflags"])
-
-dnl Can't use -ansi with gcc 4.5.3 on Cygwin, at least through setup
-dnl setup version 2.763, because it disables some features in the
-dnl system system header files and warns about them with -Wall. Try
-dnl to test for that generally, though still with gcc.
-if test "$GCC" = yes; then
- AC_CACHE_CHECK([whether we can use -ansi with gcc], [nmh_cv_has_dash_ansi],
- [nmh_saved_cppflags="$CPPFLAGS"
- nmh_saved_cflags="$CFLAGS"
- CPPFLAGS="-D_GNU_SOURCE"
- CFLAGS="-ansi -Wall -Werror"
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <time.h>],[tzset();])],
- [nmh_cv_has_dash_ansi=yes],
- [nmh_cv_has_dash_ansi=no])
- CPPFLAGS="$nmh_saved_cppflags"
- CFLAGS="$nmh_saved_cflags"])
-
- dnl Disable clang complaint about unused -ansi when linking.
- AC_CACHE_CHECK([whether linker supports -Qunused-arguments],
- [nmh_cv_has_q_unused_arguments],
- [nmh_saved_ldflags="$LDFLAGS"
- LDFLAGS="$LDFLAGS -Qunused-arguments"
- AC_TRY_LINK([],[],nmh_cv_has_q_unused_arguments=yes,
- nmh_cv_has_q_unused_arguments=no)
- LDFLAGS="$nmh_saved_ldflags"])
-
- if test "$nmh_cv_has_q_unused_arguments" = "yes"; then
- test -z "$LDFLAGS" && LDFLAGS=-Qunused-arguments \
- || LDFLAGS="$LDFLAGS -Qunused-arguments"
- fi
-else
- nmh_cv_has_dash_ansi=no
-fi
-
-dnl if the user hasn't specified CFLAGS, then
-dnl if compiler is gcc, then
-dnl use -O2 and some warning flags
-dnl else use -O
-dnl We use -Wall and -Wextra if supported. If the compiler supports it we
-dnl also use -Wno-pointer-sign, because gcc 4 now produces a lot of new
-dnl warnings which are probably mostly spurious and which in any case we
-dnl don't want to deal with now.
-if test "$nmh_cv_has_dash_ansi" = "yes"; then
- nmh_gcc_warnflags="-ansi -pedantic -Wall"
-else
- nmh_gcc_warnflags="-Wall"
-fi
-if test "$nmh_cv_has_wextra" = "yes"; then
- nmh_gcc_warnflags="${nmh_gcc_warnflags} -Wextra"
-fi