https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121031
Bug ID: 121031
Summary: if condition misparsed as declaration in Objective C
method
Product: gcc
Version: 15.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: objc
Assignee: unassigned at gcc dot gnu.org
Reporter: ats-gccbugs at offog dot org
CC: iains at gcc dot gnu.org
Target Milestone: ---
Created attachment 61836
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61836&action=edit
Minimised example
The attached example is minimised from Oolite's OOPriorityQueue.m. There are a
couple of cases in Oolite where GCC 15.1.0 is apparently misparsing a
straightforward if condition as a pointer declaration
(https://github.com/OoliteProject/oolite/pull/520) - adding brackets around the
LHS makes it happy.
Compiling with GCC 15.1.0 fails like this:
$ gcc -v -c ifparse.m
Using built-in specs.
COLLECT_GCC=gcc
Target: x86_64-pc-linux-gnu
Configured with: /src/devel/gcc/work/gcc-15.1.0/configure --prefix=/gar
--sysconfdir=/etc --localstatedir=/var --sharedstatedir=/var/com
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --enable-__cxa_atexit
--enable-threads=posix --enable-shared
--enable-languages=ada,c,c++,fortran,lto,objc,obj-c++ --with-local-prefix=/gar
--disable-multilib --with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.1.0 (GCC)
COLLECT_GCC_OPTIONS='-v' '-c' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
/gar/packages/gcc-15.1.0/bin/../libexec/gcc/x86_64-pc-linux-gnu/15.1.0/cc1obj
-quiet -v -iprefix
/gar/packages/gcc-15.1.0/bin/../lib/gcc/x86_64-pc-linux-gnu/15.1.0/ ifparse.m
-quiet -dumpbase ifparse.m -dumpbase-ext .m -mtune=generic -march=x86-64
-version -o /tmp/cccqBcCZ.s
GNU Objective-C (GCC) version 15.1.0 (x86_64-pc-linux-gnu)
compiled by GNU C version 15.1.0, GMP version 6.3.0, MPFR version
4.2.2, MPC version 1.3.1, isl version isl-0.18-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory
"/gar/packages/gcc-15.1.0/bin/../lib/gcc/x86_64-pc-linux-gnu/15.1.0/../../../../x86_64-pc-linux-gnu/include"
ignoring duplicate directory
"/gar/packages/gcc-15.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-pc-linux-gnu/15.1.0/include"
ignoring duplicate directory
"/gar/packages/gcc-15.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-pc-linux-gnu/15.1.0/include-fixed"
ignoring nonexistent directory
"/gar/packages/gcc-15.1.0/bin/../lib/gcc/../../lib/gcc/x86_64-pc-linux-gnu/15.1.0/../../../../x86_64-pc-linux-gnu/include"
ignoring duplicate directory "/usr/include"
#include "..." search starts here:
#include <...> search starts here:
/gar/packages/gcc-15.1.0/bin/../lib/gcc/x86_64-pc-linux-gnu/15.1.0/include
/gar/packages/gcc-15.1.0/bin/../lib/gcc/x86_64-pc-linux-gnu/15.1.0/include-fixed
/gar/include
End of search list.
Compiler executable checksum: 7eea9bb219287c09feb0e71d34f602c8
ifparse.m:13:1: warning: class ‘OOPriorityQueue’ defined without specifying a
base class [-Wobjc-root-class]
13 | - (void)removeObjectAtIndex:(int)i
| ^
ifparse.m: In function ‘-[OOPriorityQueue removeObjectAtIndex:]’:
ifparse.m:15:13: error: unknown type name ‘_count’
15 | if (_count * 2 < _count)
| ^~~~~~
ifparse.m:15:22: error: expected identifier or ‘(’ before numeric constant
15 | if (_count * 2 < _count)
| ^
ifparse.m:15:13: error: declaration in the controlling expression must have an
initializer
15 | if (_count * 2 < _count)
| ^~~~~~
Here's this example on Compiler Explorer: https://godbolt.org/z/5sfvxTbWe
It fails there with trunk and 15.1.0, and works with 14.3 and older versions.
