https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118147
Bug ID: 118147
Summary: #pragma GCC diagnostic push causes errors when used in
IILE in struct member initializer
Product: gcc
Version: 4.7.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: llvm at rifkin dot dev
Target Milestone: ---
This errors:
struct F {
int f = [] {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wparentheses"
return 1;
#pragma GCC diagnostic pop
} ();
};
<source>:3:36: error: file ends in default argument
3 | #pragma GCC diagnostic push
| ^
<source>:3:32: error: expected ';' at end of member declaration
3 | #pragma GCC diagnostic push
| ^~~~
| ;
<source>:3:36: error: expected '}' before end of line
3 | #pragma GCC diagnostic push
| ^
<source>:1:10: note: to match this '{'
1 | struct F {
| ^
<source>:3:36: error: expected unqualified-id before end of line
3 | #pragma GCC diagnostic push
| ^
<source>:5:9: error: expected unqualified-id before 'return'
5 | return 1;
| ^~~~~~
<source>:7:5: error: expected declaration before '}' token
7 | } ();
| ^
<source>:7:8: error: expected unqualified-id before ')' token
7 | } ();
| ^
<source>:8:1: error: expected declaration before '}' token
8 | };
| ^
Compiler returned: 1
Naturally, this does not:
int f() {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wparentheses"
return 1;
#pragma GCC diagnostic pop
}
This seems to date back to the dawn of C++11 support in gcc, 4.7.1:
https://godbolt.org/z/cEqjzsddM.
This is causing a problem with a library I maintain, libassert, where a user
has run into this bug with the following code
struct F{
int f = [&]{
int b = 3;
ASSERT(b != b);
return b;
}();
};
due to ASSERT's expansion including _Pragma("GCC diagnostic push").
