When selecting an ARM target on Debian unstable, we get:
Compiling C++ object libcommon.fa.p/disas_libvixl_vixl_utils.cc.o
FAILED: libcommon.fa.p/disas_libvixl_vixl_utils.cc.o
c++ -Ilibcommon.fa.p -I. -I.. [...] -o libcommon.fa.p/disas_libvixl_vixl_utils.cc.o -c ../disas/libvixl/vixl/utils.cc
In file included from /home/philmd/qemu/disas/libvixl/vixl/utils.h:30,
from ../disas/libvixl/vixl/utils.cc:27:
/usr/include/string.h:36:43: error: missing binary operator before token "("
36 | #if defined __cplusplus && (__GNUC_PREREQ (4, 4) \
| ^
/usr/include/string.h:53:62: error: missing binary operator before token "("
53 | #if defined __USE_MISC || defined __USE_XOPEN || __GLIBC_USE (ISOC2X)
| ^
/usr/include/string.h:165:21: error: missing binary operator before token "("
165 | || __GLIBC_USE (LIB_EXT2) || __GLIBC_USE (ISOC2X))
| ^
/usr/include/string.h:174:43: error: missing binary operator before token "("
174 | #if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2) || __GLIBC_USE (ISOC2X)
| ^
/usr/include/string.h:492:19: error: missing binary operator before token "("
492 | #if __GNUC_PREREQ (3,4)
| ^
Relevant information from the host:
$ lsb_release -d
Description: Debian GNU/Linux 11 (bullseye)
$ gcc --version
gcc (Debian 10.2.1-6) 10.2.1 20210110
$ dpkg -S /usr/include/string.h
libc6-dev: /usr/include/string.h
$ apt-cache show libc6-dev
Package: libc6-dev
Version: 2.31-11
Partially cherry-pick vixl commit 78973f258039f6e96 [*]:
Refactor VIXL to use `extern` block when including C header
that do not have a C++ counterpart.
which is similar to commit 875df03b221 ('osdep: protect qemu/osdep.h
with extern "C"').
[*] https://git.linaro.org/arm/vixl.git/commit/?id=78973f258039f6e96
Buglink: https://bugs.launchpad.net/qemu/+bug/1914870
Suggested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 20210516171023.510778-1-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2fed21d25b