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Re: [PATCH 4/4] configure: ignore preexisting QEMU_*FLAGS envvars
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [PATCH 4/4] configure: ignore preexisting QEMU_*FLAGS envvars |
Date: |
Mon, 8 Nov 2021 10:17:45 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 |
On 11/8/21 09:43, Paolo Bonzini wrote:
> User flags should be passed via CFLAGS/CXXFLAGS/LDFLAGS,
> or --extra-cflags/extra-cxxflags/--extra-ldflags on the
> command line.
>
> QEMU_CFLAGS, QEMU_CXXFLAGS and QEMU_LDFLAGS are reserved
> for flags detected by configure, so do not add to them
> and clear them at the beginning of the script.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> configure | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/configure b/configure
> index 1ea26c67e5..2048a52b20 100755
> --- a/configure
> +++ b/configure
> @@ -158,7 +158,7 @@ update_cxxflags() {
> # Set QEMU_CXXFLAGS from QEMU_CFLAGS by filtering out those
> # options which some versions of GCC's C++ compiler complain about
> # because they only make sense for C programs.
> - QEMU_CXXFLAGS="$QEMU_CXXFLAGS -D__STDC_LIMIT_MACROS
> -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS"
> + QEMU_CXXFLAGS="-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS
> -D__STDC_FORMAT_MACROS"
> CONFIGURE_CXXFLAGS=$(echo "$CONFIGURE_CFLAGS" | sed
> s/-std=gnu11/-std=gnu++11/)
> for arg in $QEMU_CFLAGS; do
> case $arg in
update_cxxflags() should keep previous QEMU_CXXFLAGS. But since
we call it only once, we don't use it to update. IMHO we should
inline this code where it is called, then overwriting QEMU_CXXFLAGS
makes sense.