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Avoid changing the C++ ABI with ssize_t.

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Bug: 8253769
Change-Id: Ia325003ed6e59da553e2bdde7c43515bc191b8ba
This commit is contained in:
Elliott Hughes 2013-02-28 10:51:14 -08:00
parent f5f906c184
commit e255642dc1
2 changed files with 17 additions and 1 deletions
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9
libc/include/sys/types.h
View file

@ -85,8 +85,17 @@ typedef .... pthread_t;
#ifndef _SSIZE_T_DEFINED_
#define _SSIZE_T_DEFINED_
/* Traditionally, bionic's ssize_t was "long int". This causes GCC to emit warnings when you
* pass a ssize_t to a printf-style function. The correct type is __kernel_ssize_t, which is
* "int", which isn't an ABI change for C code (because they're the same size) but is an ABI
* change for C++ because "int" and "long int" mangle to "i" and "l" respectively. So until
* we can fix the ABI, this is the best we can do. http://b/8253769. */
#if defined(__cplusplus)
typedef long int ssize_t;
#else
typedef __kernel_ssize_t ssize_t;
#endif
#endif
typedef __kernel_suseconds_t suseconds_t;
typedef __kernel_time_t time_t;

9
tests/stdio_test.cpp
View file

@ -171,10 +171,17 @@ TEST(stdio, getline_invalid) {
}
TEST(stdio, printf_ssize_t) {
// We used to have a ssize_t definition that confused GCC into saying:
#if __BIONIC__
// http://b/8253769
ASSERT_EQ(sizeof(__kernel_ssize_t), sizeof(long int));
ASSERT_EQ(sizeof(ssize_t), sizeof(long int));
#else
// TODO: add a .c file so we can test this for bionic --- our C ssize_t is fine.
// For our 32-bit C++ ABI, we have a ssize_t definition that confuses GCC into saying:
// error: format '%zd' expects argument of type 'signed size_t',
// but argument 4 has type 'ssize_t {aka long int}' [-Werror=format]
ssize_t v = 1;
char buf[32];
snprintf(buf, sizeof(buf), "%zd", v);
#endif
}