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Re: ICE in 4.8.2 with compound literal


On 25/11/2014 10:27, Marek Polacek wrote:
On Tue, Nov 25, 2014 at 10:19:21AM +0100, Mason wrote:
Aaah, you want me to post the bug report to BZ, not here...

Yep - the snippet + command-line options you posted was enough to reproduce
the bug.  The GCC mailing list is not for reporting bugs.

Gotcha.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64067

When you have a minute, can you take a look at my other message?
"Using Compound Literal + type-punning to initialize static const array"

You committed a patch that seems relevant just a few days ago. But the
documentation lead me to believe that the feature I was looking for had
been supported for a very long time (gcc 3.x at least)

I haven't read that in detail yet, but my patch just allowed the
initializing even for gnu99/gnu11 (formerly, it was only allowed in the
gnu89 mode).

Hmmm, then my test case incorrectly used gnu99.

Here's a simpler test case, using gnu89, producing the same error:

union foob { int val; struct { int X; } bits; };
static const int u = ((union foob) {.bits = { .X=42 }}).val;

$ gcc -std=gnu89 test.c
test.c:2:30: error: initializer element is not constant
 static const int u = ((union foob) {.bits = { .X=42 }}).val;


Isn't this supposed to work? Or did I misunderstand the extension?
(Tell me if I should file a bug report.)


$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.2-19ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-3
2
=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)

Regards.


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