https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90804
Bug ID: 90804
Summary: function declaration cannot have variably modified
type
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: zhonghao at pku dot org.cn
Target Milestone: ---
My gcc is 10.0.0, and the code is:
int a(int b) {int (*c(void))[b];**c() = 2;}
gcc accepts the code, but clang, icc, and msvc all reject it:
clang:
source>:1:21: error: function declaration cannot have variably modified type
int a(int b) {int (*c(void))[b];**c() = 2;}
^
1 error generated.
Compiler returned: 1
icc:
<source>(1): error: an entity with linkage cannot have a type involving a
variable length array
int a(int b) {int (*c(void))[b];**c() = 2;}
^
compilation aborted for <source> (code 2)
Compiler returned: 2
msvc:
example.cpp
<source>(1): error C2131: expression did not evaluate to a constant
<source>(1): note: failure was caused by a read of a variable outside its
lifetime
<source>(1): note: see usage of 'b'
Compiler returned: 2
