dnl * gcc specific options

AC_DEFUN([DOVECOT_CFLAGS],[

if test "x$ac_cv_c_compiler_gnu" = "xyes"; then

# -Wcast-qual -Wcast-align -Wconversion -Wunreachable-code # too many warnings

# -Wstrict-prototypes -Wredundant-decls # may give warnings in some systems

# -Wmissing-format-attribute -Wmissing-noreturn -Wwrite-strings # a couple of warnings

CFLAGS="$CFLAGS -Wall -W -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith -Wchar-subscripts -Wformat=2 -Wbad-function-cast"

if test "$have_clang" = "yes"; then

AC_TRY_COMPILE([

#if __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 3)

# error new clang

#endif

],,,[

# clang 3.3+ unfortunately this gives warnings with hash.h

CFLAGS="$CFLAGS -Wno-duplicate-decl-specifier"

])

else

# This is simply to avoid warning when building strftime() wrappers..

CFLAGS="$CFLAGS -fno-builtin-strftime"

fi

AC_TRY_COMPILE([

#if __GNUC__ < 4

# error old gcc

#endif

],,[

# gcc4

CFLAGS="$CFLAGS -Wstrict-aliasing=2"

])

# Use std=gnu99 if we have new enough gcc

old_cflags=$CFLAGS

CFLAGS="-std=gnu99"

AC_TRY_COMPILE([

],, [

CFLAGS="$CFLAGS $old_cflags"

], [

CFLAGS="$old_cflags"

])

fi

if test "$have_clang" = "yes"; then

# clang specific options

if test "$want_devel_checks" = "yes"; then

# FIXME: enable once md[45], sha[12] can be compiled without

#CFLAGS="$CFLAGS -fsanitize=integer,undefined -ftrapv"

:

fi

fi

])