Date: Sun, 20 Dec 2015 00:33:15 -0800 From: Mark Millard <markmi@dsl-only.net> To: Andreas Tobler <andreast-list@fgznet.ch>, Konstantin Belousov <kostikbel@gmail.com> Cc: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: bug 205453: another buildworld failure that shows up for powerpc64 lib32 contexts Message-ID: <4E5F2AD9-180D-4800-98D7-774F40808FB6@dsl-only.net> In-Reply-To: <5671D5DD.9090808@fgznet.ch> References: <894D2513-6DE7-4E31-87A5-0529ECDF336C@dsl-only.net> <20151215123640.GG3625@kib.kiev.ua> <5671D5DD.9090808@fgznet.ch>
next in thread | previous in thread | raw e-mail | index | archive | help
I have submitted bug 205453: another buildworld failure that shows up =
for powerpc64 lib32 contexts.
But in this case I submitted against the Base System for sys/cdefs.h =
and/or libcxxrt/guard.cc problems in using/handling C11's =
_Static_assert.
You may want to look and see if you expect it should instead be =
attributed to the various g++ compilers (g++49, g++5, =
powerpc64-portbld-freebsd11.0-g++, . . .). A simple 6 line program =
source shows the g++ syntax error issue with a direct use of =
_Static_assert. (See the bug.) As I understand C++ the rejections are =
valid/allowed.
gcc49, gcc5, powerpc64-portbld-freebsd11.0-gcc, . . . accept the same =
C11 _Static_assert notation fine when compiling the same source file =
content as C code. clang++ (3.7) accepts the C11 _Static_assert syntax =
in C++ compiles.
But:
# clang++ -Wall -pedantic main.cc
main.cc:2:1: warning: _Static_assert is a C11-specific feature =
[-Wc11-extensions]
_Static_assert(1,"Test");
^
1 warning generated.
In the buildworld case the reason for lib32's -m32 compiles being =
involved is #if/#elif/. . . structure for =
non-__arm__/non-_LP64/non-__LITTLE_ENDIAN__ contexts being the only ones =
to attempt to use C11's _Static_assert in libcxxrt/guard.cc's C++ source =
code:
#ifdef __arm__
. . .
#elif defined(_LP64)
. . .
#else
typedef uint32_t guard_lock_t;
# if defined(__LITTLE_ENDIAN__)
. . .
# else
typedef struct {
uint32_t init_half;
uint32_t lock_half;
} guard_t;
_Static_assert(sizeof(guard_t) =3D=3D sizeof(uint64_t), "");
. . .
# endif
. . .
#endif
=3D=3D=3D
Mark Millard
markmi at dsl-only.net
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4E5F2AD9-180D-4800-98D7-774F40808FB6>