Re: [Buildroot] [PATCH 1/1] package/mpd fix build failure with fmt 12.2.0

Re: [Buildroot] [PATCH 1/1] package/mpd fix build failure with fmt 12.2.0

[Andreas Ziegler]

Hi Bernd,

On 2026-07-09 14:55, Bernd Kuhls wrote:
> [This mail was also posted to gmane.comp.lib.uclibc.buildroot.]
> 
> Am Thu,  9 Jul 2026 16:01:42 +0200 schrieb Andreas Ziegler:
> 
>> Building mpd with fmt 12.2.0 fails with:
>> 
>> ../src/net/ToString.cxx: In function 'std::string
>> ToString(SocketAddress)': ../src/net/ToString.cxx:80:37: error: 
>> 'format'
>> is not a member of 'fmt'
>>    80 |                         return fmt::format("[{}]:{}", host,
>>    serv);
>>       |                                     ^~~~~~
>> ../src/net/ToString.cxx:84:29: error: 'format' is not a member of 
>> 'fmt'
>>    84 |                 return fmt::format("{}:{}", host, serv);
>>       |                             ^~~~~~
>> 
> 
> Hi Andreas,
> 
> what about backporting
> https://github.com/MusicPlayerDaemon/MPD/commit/
> 88d5b5248d71862815da336cfd1c6f66626bb4d4
> 
> The patch applies cleanly to mpd-0.24.12.

Thank you for pointing this out, I will use this instead.

> Regards, Bernd

Kind regards,
Andreas
_______________________________________________
buildroot mailing list
buildroot@buildroot.org
https://lists.buildroot.org/mailman/listinfo/buildroot

[Buildroot] [PATCH 1/1] package/mpd fix build failure with fmt 12.2.0

[Andreas Ziegler]

Building mpd with fmt 12.2.0 fails with:

../src/net/ToString.cxx: In function 'std::string ToString(SocketAddress)':
../src/net/ToString.cxx:80:37: error: 'format' is not a member of 'fmt'
   80 |                         return fmt::format("[{}]:{}", host, serv);
      |                                     ^~~~~~
../src/net/ToString.cxx:84:29: error: 'format' is not a member of 'fmt'
   84 |                 return fmt::format("{}:{}", host, serv);
      |                             ^~~~~~

Root cause is an API change in fmt:

Made the <fmt/core.h> header equivalent to <fmt/base.h> by default. Code
that relied on <fmt/core.h> pulling in <fmt/format.h> must now either
include <fmt/format.h> directly or define FMT_DEPRECATED_HEAVY_CORE to
opt back in. (https://github.com/fmtlib/fmt/releases#release-12.2.0)

Implement the mentioned workaround until mpd adopts the new architecture.

Signed-off-by: Andreas Ziegler <br025@umbiko.net>
---
 package/mpd/mpd.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/package/mpd/mpd.mk b/package/mpd/mpd.mk
index 2014488520..feaf3d4e84 100644
--- a/package/mpd/mpd.mk
+++ b/package/mpd/mpd.mk
@@ -27,6 +27,9 @@ MPD_CONF_OPTS = \
 	-Dsidplay=disabled \
 	-Dsnapcast=false
 
+# remove this once mpd has moved the minimum fmt version to 12.2.0
+MPD_CXXFLAGS = $(TARGET_CFLAGS) -DFMT_DEPRECATED_HEAVY_CORE=1
+
 ifeq ($(BR2_PACKAGE_EXPAT),y)
 MPD_DEPENDENCIES += expat
 MPD_CONF_OPTS += -Dexpat=enabled
-- 
2.53.0

_______________________________________________
buildroot mailing list
buildroot@buildroot.org
https://lists.buildroot.org/mailman/listinfo/buildroot