On 06/15/2012 04:55 PM, Vincent Torri wrote:
>
> thank you for all the tips ! Just for information, I use
>
> EFL_CHECK_COMPILER_FLAGS([-Wno-foo -Wbar])
Don't you mean:
EFL_CHECK_COMPILER_FLAGS([efl], [-Wno-foo -Wbar])
>
> with the code below (i've taken into account your remarks)
>
> i'm not sure that the m4_foreach below is properly quoted
>
> AC_DEFUN([EFL_CHECK_COMPILER_FLAG],
> [
> m4_pushdef([UPEFL], m4_translit([[$1]], [-a-z], [_A-Z]))
> m4_pushdef([UP], m4_translit([[$2]], [-a-z], [_A-Z]))
>
> m4_if(m4_index([$2], [-Wno-]), [0], [m4_pushdef([flagm4],
> [m4_bpatsubst([[$2]], [no-])])], [m4_pushdef([flagm4], [$2])])
This can be shortened:
m4_pushdef([flagm4], m4_bpatsubst([[$2]], [no-]))
since m4_bpatsubst is a no-op if the pattern 'no-' doesn't appear.
>
> option=flagm4
And since this is the only use of flagm4, and I have now shortened the
computation, you could inline the computation instead of using a temp m4
variable:
option=m4_bpatsubst([[$2]], [no-])
> CFLAGS_save="${CFLAGS}"
Personally, I'd write this as:
CFLAGS_save=$CFLAGS
as "" are unnecessary in a single-word assignment, and {} is unnecessary
when there is nothing after the variable name. I might not be terse in
my comments, but I try to be terse in my code :) But what you have is
correct, and I won't fault you if that is your personal shell coding style.
> CFLAGS="${CFLAGS} ${option}"
Here, the "" are necessary, but again the ${} is extra typing.
>
> UPEFL[_CFLAGS]="${UPEFL[_CFLAGS]} [$2]"
> AC_ARG_VAR(UPEFL[_CFLAGS], [preprocessor flags for $2])
> AC_SUBST(UPFEL[_CFLAGS])
Hope that typo was unintentional (EFL vs. FEL).
>
> AM_CONDITIONAL([EFL_HAVE]UP, [test "x${have_flag}" = "xyes"])
>
> m4_popdef([UP])
> m4_popdef([UPEFL])
missing m4_popdef([flagm4]) if you keep the temp m4 variable.
> ])
>
> dnl Macro that iterates over a sequence of white separated flags
> dnl and that call EFL_CHECK_COMPILER_FLAG() for each of these flags
> dnl
> dnl EFL_CHECK_COMPILER_FLAGS(EFL, FLAGS)
>
> AC_DEFUN([EFL_CHECK_COMPILER_FLAGS],
> [
> m4_foreach_w([flag], [$2], [EFL_CHECK_COMPILER_FLAG($1, m4_defn([flag]))])
Almost.
m4_foreach_w([flag], [$2],
[EFL_CHECK_COMPILER_FLAG([$1], m4_defn([flag]))])
--
Eric Blake eblake@xxxxxxxxxx +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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