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Reject C++ pointer casts to integer types that are too small [EDGcpfe/28892] #454

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13 changes: 13 additions & 0 deletions src/pending_changes/edg-28892-pointer-integer-cast.txt
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@@ -0,0 +1,13 @@
[GH #454]
GNU C++ mode: casts of pointers to integer types that are too small

In GNU C++ mode (including Clang mode), a cast of a pointer to an integer type
too small to hold all of its bits was accepted with a warning. GCC 4.0 and
later, and Clang, reject such casts, and the standard requires a diagnostic.
They are now errors, except when emulating GCC versions before 4.0, which
accepted them with a warning. For example, with --g++ on a target with 64-bit
pointers:

unsigned char narrow(void *p) {
return reinterpret_cast<unsigned char>(p); // Now an error.
}
6 changes: 4 additions & 2 deletions src/types.c
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Expand Up @@ -14037,14 +14037,16 @@ well as C++ mode.
) ||
(is_nullptr(source_type) && !source_type->incomplete)) &&
is_integral(dest_type) &&
(C_mode() || ms_extensions || gpp_mode ||
(C_mode() || ms_extensions || gpp_version_is(<40000) ||
dest_of_ptr_cast_big_enough(source_type, dest_type))) {

@daveedvdv-nvidia daveedvdv-nvidia Nov 2, 2026

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I tracked down why that gpp_mode is there. It's for this test case:

int main()
{
        int *ptr;
        int x;

        x = (int)ptr;
        x = (short)ptr;  // warning in gcc 3.4.6

        return 0;
}

Prior to GCC 4, this was accepted with a warning (https://godbolt.org/z/fG4YcKKr9).
Note that your test case was not accepted even then.
Rather than emulating this 100% accurately, I'd just replace the gpp_mode by gpp_version_is(<40000). That way any pre-GCC-4 code out there that relies on the leniency will continue to work (which should not be a whole lot), and modern code will track GCC 4+.

@71iq 71iq Nov 8, 2026

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Thanks for tracking that down. I replaced gpp_mode with gpp_version_is(<40000), so Clang mode and GNU C++ 4.0 and later now give the error. regressions/edg-28892-legacy is your example with --gnu_version=30406: (int)ptr and (short)ptr are accepted with a warning.

/* Pointer or std::nullptr_t (but not the managed nullptr type,
identified by being incomplete) --> integral is okay
-- In C mode, always (size of destination is not an issue; see
6.3.4 in the ISO C89 standard)
-- In C++ mode, if (a) the integer is big enough or (b) it's
not big enough but we're compiling in Microsoft or GNU mode. */
not big enough but we're compiling in Microsoft mode or
emulating a GNU C++ version before 4.0 (which accepted such
casts with a warning). */
okay = TRUE;
if (!dest_of_ptr_cast_big_enough(source_type, dest_type)) {
/* The destination is not large enough to hold all of the bits
Expand Down
1 change: 1 addition & 0 deletions tests/expectations/edg_x86_32/imported.log
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Expand Up @@ -918,6 +918,7 @@ gnu/cpp/other/pr49133.sft.cpp:rp:-DTEST_NUMBER=1:FAIL(COMPILE):
gnu/cpp/other/profile1.sft.cpp:rp:-DTEST_NUMBER=1:CATASTROPHE(COMPILE):
gnu/cpp/other/ucnid-1-utf8.sft.cpp:rp:-DTEST_NUMBER=1:FAIL(COMPILE):
gnu/cpp/other/ucnid-1.sft.cpp:rp:-DTEST_NUMBER=1:FAIL(COMPILE):
gnu/cpp/parse/cast1.sft.cpp:fp:-DTEST_NUMBER=1 -w:PASS:
gnu/cpp/parse/lookup1.sft.cpp:fp:-DTEST_NUMBER=1:FAIL:
gnu/cpp/parse/offsetof2.sft.cpp:fp:-DTEST_NUMBER=1:FAIL:
gnu/cpp/parse/offsetof3.sft.cpp:fp:-DTEST_NUMBER=1:FAIL:
Expand Down
1 change: 1 addition & 0 deletions tests/expectations/edg_x86_32_cp/imported.log
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Expand Up @@ -1129,6 +1129,7 @@ gnu/cpp/other/ucnid-1-utf8.sft.cpp:rp:-DTEST_NUMBER=1:FAIL(COMPILE):
gnu/cpp/other/ucnid-1.sft.cpp:rp:-DTEST_NUMBER=1:FAIL(COMPILE):
gnu/cpp/overload/defarg5.sft.cpp:fn:-DTEST_NUMBER=1:ABORT:
gnu/cpp/overload/volatile2.sft.cpp:fp:-DTEST_NUMBER=1 --c++11:FAIL:
gnu/cpp/parse/cast1.sft.cpp:fp:-DTEST_NUMBER=1 -w:PASS:
gnu/cpp/parse/crash30.sft.cpp:fn:-DTEST_NUMBER=1:PASS:
gnu/cpp/parse/crash75.sft.cpp:fn:-DTEST_NUMBER=1:PASS:
gnu/cpp/parse/defarg5.sft.cpp:fp:-DTEST_NUMBER=1:FAIL:
Expand Down
2 changes: 1 addition & 1 deletion tests/expectations/edg_x86_64/imported.log
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Expand Up @@ -8658,6 +8658,7 @@ gnu/cpp/parse/ambig14.sft.cpp:fp:-DTEST_NUMBER=1 --c++11:FAIL:
gnu/cpp/parse/array-size2.sft.cpp:fn:-DTEST_NUMBER=1:FAIL:
gnu/cpp/parse/attr3.sft.cpp:fn:-DTEST_NUMBER=1 --c++23 --c++20:FAIL:
gnu/cpp/parse/bitfield5.sft.cpp:fp:-DTEST_NUMBER=1:FAIL:
gnu/cpp/parse/cast1.sft.cpp:fp:-DTEST_NUMBER=1 -w:FAIL:
gnu/cpp/parse/concat1.sft.cpp:fn:-DTEST_NUMBER=1:FAIL:
gnu/cpp/parse/constructor2.sft.cpp:fn:-DTEST_NUMBER=1 --c++20:FAIL:
gnu/cpp/parse/constructor3.sft.cpp:fn:-DTEST_NUMBER=1:FAIL:
Expand Down Expand Up @@ -8885,7 +8886,6 @@ gnu/cpp/template/redecl2.sft.cpp:fn:-DTEST_NUMBER=1:FAIL:
gnu/cpp/template/repo3.sft.cpp:fp:-DTEST_NUMBER=1:FAIL:
gnu/cpp/template/sfinae-dr657.sft.cpp:fn:-DTEST_NUMBER=1:FAIL:
gnu/cpp/template/sfinae11.sft.cpp:fp:-DTEST_NUMBER=1:FAIL:
gnu/cpp/template/sfinae13.sft.cpp:fp:-DTEST_NUMBER=1:FAIL:
gnu/cpp/template/sfinae3.sft.cpp:fn:-DTEST_NUMBER=1:FAIL:
gnu/cpp/template/shadow2.sft.cpp:fn:-DTEST_NUMBER=1:FAIL:
gnu/cpp/template/sizeof11.sft.cpp:fn:-DTEST_NUMBER=1:FAIL:
Expand Down
6 changes: 3 additions & 3 deletions tests/tests/imported/clang/cpp/CXX/temp/temp.res/.p4.rto/default.1.1.txt
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Expand Up @@ -59,15 +59,15 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
enum E : T::type {}; // expected-error{{missing 'typename'}}
^

"Test_name.c", line 184: warning: conversion from pointer to smaller integer
"Test_name.c", line 184: error: invalid type conversion
friend X::X(T::type = (int)(void(*)(typename T::type))(nullptr)); // expected-error {{friend declaration specifying a default argument must be a definition}}
^

"Test_name.c", line 185: error: nontype "T::type" is not a type name
friend X::X(T::type = (int)(void(*)(T::type))(nullptr)); // expected-error {{friend declaration specifying a default argument must be a definition}} \
^

"Test_name.c", line 185: warning: conversion from pointer to smaller integer
"Test_name.c", line 185: error: invalid type conversion
friend X::X(T::type = (int)(void(*)(T::type))(nullptr)); // expected-error {{friend declaration specifying a default argument must be a definition}} \
^

Expand Down Expand Up @@ -105,4 +105,4 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
const auto *ConstCast = const_cast<const T::type *>(Ptr);
^

20 errors detected in the compilation of "Test_name.c".
22 errors detected in the compilation of "Test_name.c".
6 changes: 3 additions & 3 deletions tests/tests/imported/clang/cpp/CXX/temp/temp.res/.p4.rto/edg_x86_64_cp.1.1.txt
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Expand Up @@ -71,15 +71,15 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
enum E : T::type {}; // expected-error{{missing 'typename'}}
^

"Test_name.c", line 184: warning: conversion from pointer to smaller integer
"Test_name.c", line 184: error: invalid type conversion
friend X::X(T::type = (int)(void(*)(typename T::type))(nullptr)); // expected-error {{friend declaration specifying a default argument must be a definition}}
^

"Test_name.c", line 185: error: nontype "T::type" is not a type name
friend X::X(T::type = (int)(void(*)(T::type))(nullptr)); // expected-error {{friend declaration specifying a default argument must be a definition}} \
^

"Test_name.c", line 185: warning: conversion from pointer to smaller integer
"Test_name.c", line 185: error: invalid type conversion
friend X::X(T::type = (int)(void(*)(T::type))(nullptr)); // expected-error {{friend declaration specifying a default argument must be a definition}} \
^

Expand All @@ -105,4 +105,4 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
^
detected during instantiation of class "GH113324::S2<T> [with T=void]" at line 207

20 errors detected in the compilation of "Test_name.c".
22 errors detected in the compilation of "Test_name.c".
8 changes: 4 additions & 4 deletions tests/tests/imported/clang/cpp/SemaCXX/.cstyle-cast.rto/default.1.1.txt
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Expand Up @@ -51,15 +51,15 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
(void)(int A::*)((int F::*)0); // expected-error {{conversion from pointer to member of class 'F' to pointer to member of class 'A' via virtual base 'B' is not allowed}}
^

"Test_name.c", line 181: warning: conversion from pointer to smaller integer
"Test_name.c", line 181: error: invalid type conversion
(void)(char)(fnp); // expected-error {{cast from pointer to smaller type 'char' loses information}}
^

"Test_name.c", line 186: warning: conversion from pointer to smaller integer
"Test_name.c", line 186: error: invalid type conversion
(void)(char)((void*)0); // expected-error {{cast from pointer to smaller type 'char' loses information}}
^

"Test_name.c", line 187: warning: conversion from pointer to smaller integer
"Test_name.c", line 187: error: invalid type conversion
(void)(char)((int*)0); // expected-error {{cast from pointer to smaller type 'char' loses information}}
^

Expand All @@ -75,4 +75,4 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
(void)(int structure::*)(psf); // expected-error-re {{C-style cast from 'void (structure::*)(){{( __attribute__\(\(thiscall\)\))?}}' to 'int structure::*' is not allowed}}
^

12 errors detected in the compilation of "Test_name.c".
15 errors detected in the compilation of "Test_name.c".
4 changes: 2 additions & 2 deletions tests/tests/imported/clang/cpp/SemaCXX/.functional-cast.rto/default.1.1.txt
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Expand Up @@ -90,7 +90,7 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
(void)Amp((int F::*)0); // expected-error {{conversion from pointer to member of class 'F' to pointer to member of class 'A' via virtual base 'B' is not allowed}}
^

"Test_name.c", line 245: warning: conversion from pointer to smaller integer
"Test_name.c", line 245: error: invalid type conversion
(void)char(fnp); // expected-error {{cast from pointer to smaller type 'char' loses information}}
^

Expand All @@ -114,4 +114,4 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
(void)int_ref(); // expected-error {{reference to type 'int' requires an initializer}}
^

19 errors detected in the compilation of "Test_name.c".
20 errors detected in the compilation of "Test_name.c".
4 changes: 2 additions & 2 deletions tests/tests/imported/clang/cpp/SemaCXX/.nullptr.rto/default.1.1.txt
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Expand Up @@ -38,7 +38,7 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
(void)&nullptr;
^

"SemaCXX/nullptr.cpp", line 68: warning: conversion from pointer to smaller integer
"SemaCXX/nullptr.cpp", line 68: error: invalid type conversion
(void)reinterpret_cast<char>(nullptr);
^

Expand Down Expand Up @@ -78,4 +78,4 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
void *q = null();
^

11 errors detected in the compilation of "Test_name.c".
12 errors detected in the compilation of "Test_name.c".
4 changes: 2 additions & 2 deletions tests/tests/imported/clang/cpp/SemaCXX/.reinterpret-cast.rto/default.1.1.txt
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Expand Up @@ -19,7 +19,7 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
const int ci = 0;
^

"SemaCXX/reinterpret-cast.cpp", line 45: warning: conversion from pointer to smaller integer
"SemaCXX/reinterpret-cast.cpp", line 45: error: invalid type conversion
(void)reinterpret_cast<char>(fnp);
^

Expand Down Expand Up @@ -123,4 +123,4 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
(void)*reinterpret_cast<const TARGETTYPE*>(data);
^

15 errors detected in the compilation of "Test_name.c".
16 errors detected in the compilation of "Test_name.c".
4 changes: 2 additions & 2 deletions tests/tests/imported/clang/cpp/SemaCXX/.reinterpret-cast.rto/edg_x86_32_cp.1.1.txt
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Expand Up @@ -19,7 +19,7 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
const int ci = 0;
^

"SemaCXX/reinterpret-cast.cpp", line 45: warning: conversion from pointer to smaller integer
"SemaCXX/reinterpret-cast.cpp", line 45: error: invalid type conversion
(void)reinterpret_cast<char>(fnp);
^

Expand Down Expand Up @@ -147,4 +147,4 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
const int data[size];
^

15 errors detected in the compilation of "Test_name.c".
16 errors detected in the compilation of "Test_name.c".
4 changes: 2 additions & 2 deletions tests/tests/imported/clang/cpp/SemaCXX/.reinterpret-cast.rto/edg_x86_64_cp.1.1.txt
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Expand Up @@ -19,7 +19,7 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
const int ci = 0;
^

"SemaCXX/reinterpret-cast.cpp", line 45: warning: conversion from pointer to smaller integer
"SemaCXX/reinterpret-cast.cpp", line 45: error: invalid type conversion
(void)reinterpret_cast<char>(fnp);
^

Expand Down Expand Up @@ -147,4 +147,4 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
const int data[size];
^

15 errors detected in the compilation of "Test_name.c".
16 errors detected in the compilation of "Test_name.c".
4 changes: 2 additions & 2 deletions tests/tests/imported/clang/cpp/SemaCXX/.unknown-anytype.rto/default.1.1.txt
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Expand Up @@ -35,7 +35,7 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
extern __unknown_anytype test1(...);
^

"Test_name.c", line 46: warning: conversion from pointer to smaller integer
"Test_name.c", line 46: error: invalid type conversion
int x = (int) test1; // expected-error {{function 'test1' with unknown type must be given a function type}}
^

Expand All @@ -55,4 +55,4 @@ fe_only -DTEST_NUMBER=1 --clang -tused -e 200 --no_wrap_diagnostics --clang_vers
extern __unknown_anytype var;
^

13 errors detected in the compilation of "Test_name.c".
14 errors detected in the compilation of "Test_name.c".
6 changes: 3 additions & 3 deletions tests/tests/imported/gnu/cpp/cpp0x/.nullptr04.rto/default.1.1.txt
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Expand Up @@ -7,7 +7,7 @@ fe_only -DTEST_NUMBER=1 --gnu_version=999999 -tused -e 200 --no_wrap --no_wrap_d
const int n4 = static_cast<const int>(nullptr); // { dg-error "16:invalid 'static_cast' " }
^

"Test_name.c", line 10: warning: conversion from pointer to smaller integer
"Test_name.c", line 10: error: invalid type conversion
const short int n5 = reinterpret_cast<short int>(nullptr); // { dg-error "22:cast from .std::nullptr_t. to .short int. loses precision" "" { target { ! ptr_eq_short } } }
^

Expand All @@ -19,7 +19,7 @@ fe_only -DTEST_NUMBER=1 --gnu_version=999999 -tused -e 200 --no_wrap --no_wrap_d
const int n8 = static_cast<const int>(mynull); // { dg-error "16:invalid 'static_cast' " }
^

"Test_name.c", line 16: warning: conversion from pointer to smaller integer
"Test_name.c", line 16: error: invalid type conversion
const short int n9 = reinterpret_cast<short int>(mynull); // { dg-error "22:cast from .std::nullptr_t. to .short int. loses precision" "" { target { ! ptr_eq_short } } }
^

Expand Down Expand Up @@ -55,4 +55,4 @@ fe_only -DTEST_NUMBER=1 --gnu_version=999999 -tused -e 200 --no_wrap --no_wrap_d
const intptr_t n11 = (intptr_t)mynull;
^

2 errors detected in the compilation of "Test_name.c".
4 errors detected in the compilation of "Test_name.c".
13 changes: 13 additions & 0 deletions tests/tests/imported/gnu/cpp/parse/.cast1.rto/default.1.1.txt
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@@ -1 +1,14 @@
fe_only -DTEST_NUMBER=1 --gnu_version=999999 -tused -e 200 --no_wrap --no_wrap_diagnostics -w Test_name.c
"./parse/cast1.C", line 8: error: invalid type conversion
(int((char*)0));
^

"./parse/cast1.C", line 9: error: invalid type conversion
sizeof ((int((char*)0)));
^

"./parse/cast1.C", line 10: error: invalid type conversion
typeid ((int((char*)0)));
^

3 errors detected in the compilation of "Test_name.c".
1 change: 1 addition & 0 deletions tests/tests/imported/gnu/cpp/parse/.cast1.rto/edg_x86_32.1.1.txt
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@@ -0,0 +1 @@
fe_only -DTEST_NUMBER=1 --gnu_version=999999 -tused -e 200 --no_wrap --no_wrap_diagnostics -w Test_name.c
1 change: 1 addition & 0 deletions tests/tests/imported/gnu/cpp/parse/.cast1.rto/edg_x86_32_cp.1.1.txt
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@@ -0,0 +1 @@
fe_only -DTEST_NUMBER=1 --gnu_version=999999 -tused -e 200 --no_wrap --no_wrap_diagnostics -w Test_name.c
23 changes: 0 additions & 23 deletions tests/tests/imported/gnu/cpp/template/.sfinae13.rto/default.1.1.txt
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@@ -1,24 +1 @@
fe_only -DTEST_NUMBER=1 --gnu_version=999999 -tused -e 200 --no_wrap --no_wrap_diagnostics Test_name.c
"Test_name.c", line 59: warning: conversion from pointer to smaller integer
CHECK_CAST(reinterpret);
^
detected during:
instantiation of "check_reinterpret_cast" based on template arguments <void *, char> at line 59
instantiation of class "has_reinterpret_cast<T, U> [with T=void *, U=char]" at line 83

"Test_name.c", line 83: error: static assertion failed with "!(has_reinterpret_cast<void*, char>::value)"
STATIC_ASSERT(!(has_reinterpret_cast<void*, char>::value));
^

"Test_name.c", line 38: warning: conversion from pointer to smaller integer
typename enable_if<(sizeof(((U)create_a<T>()), 0) > 0), yes_type>::type
^
detected during:
instantiation of "check_c_cast" based on template arguments <void *, char> at line 47
instantiation of class "has_c_cast<T, U> [with T=void *, U=char]" at line 88

"Test_name.c", line 88: error: static assertion failed with "!(has_c_cast<void*, char>::value)"
STATIC_ASSERT(!(has_c_cast<void*, char>::value));
^

2 errors detected in the compilation of "Test_name.c".
24 changes: 0 additions & 24 deletions tests/tests/imported/gnu/cpp/template/.sfinae13.rto/edg_x86_32.1.1.txt
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This file was deleted.

24 changes: 0 additions & 24 deletions tests/tests/imported/gnu/cpp/template/.sfinae13.rto/edg_x86_32_cp.1.1.txt
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This file was deleted.

9 changes: 9 additions & 0 deletions tests/tests/regressions/.edg-28892-legacy.rto/default.1.1.txt
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@@ -0,0 +1,9 @@
fe_only -DTEST_NUMBER=1 --g++ --gnu_version=30406 Test_name.c
"Test_name.c", line 11: warning: conversion from pointer to smaller integer
x = (int)ptr;
^

"Test_name.c", line 12: warning: conversion from pointer to smaller integer
x = (short)ptr;
^

5 changes: 5 additions & 0 deletions tests/tests/regressions/.edg-28892-legacy.rto/edg_x86_32.1.1.txt
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@@ -0,0 +1,5 @@
fe_only -DTEST_NUMBER=1 --g++ --gnu_version=30406 Test_name.c
"Test_name.c", line 12: warning: conversion from pointer to smaller integer
x = (short)ptr;
^

5 changes: 5 additions & 0 deletions tests/tests/regressions/.edg-28892-legacy.rto/edg_x86_32_cp.1.1.txt
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@@ -0,0 +1,5 @@
fe_only -DTEST_NUMBER=1 --g++ --gnu_version=30406 Test_name.c
"Test_name.c", line 12: warning: conversion from pointer to smaller integer
x = (short)ptr;
^

1 change: 1 addition & 0 deletions tests/tests/regressions/.edg-28892-positive.rto/default.1.1.txt
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@@ -0,0 +1 @@
fe_only -DTEST_NUMBER=1 --c++20 --g++ --gnu_version=130300 Test_name.c
1 change: 1 addition & 0 deletions tests/tests/regressions/.edg-28892-positive.rto/default.2.1.txt
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@@ -0,0 +1 @@
fe_only -DTEST_NUMBER=2 --c++20 --strict Test_name.c
10 changes: 10 additions & 0 deletions tests/tests/regressions/.edg-28892.rto/default.1.1.txt
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@@ -0,0 +1,10 @@
fe_only -DTEST_NUMBER=1 --c++20 --g++ --gnu_version=130300 Test_name.c
"Test_name.c", line 7: error: invalid type conversion
return reinterpret_cast<unsigned char>(p); // Must be an error in GNU mode.
^

"Test_name.c", line 10: error: invalid type conversion
return reinterpret_cast<unsigned char>(p); // Must also be an error.
^

2 errors detected in the compilation of "Test_name.c".
10 changes: 10 additions & 0 deletions tests/tests/regressions/.edg-28892.rto/default.2.1.txt
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fe_only -DTEST_NUMBER=2 --c++20 --g++ --gnu_version=150200 Test_name.c
"Test_name.c", line 7: error: invalid type conversion
return reinterpret_cast<unsigned char>(p); // Must be an error in GNU mode.
^

"Test_name.c", line 10: error: invalid type conversion
return reinterpret_cast<unsigned char>(p); // Must also be an error.
^

2 errors detected in the compilation of "Test_name.c".
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