Hi all,
I'm having trouble with getting correct section sizes under MinGW.
The example below demonstrates the issue:
test.c:
#include <stdio.h>
#include <stdint.h>
typedef struct
{
uint16_t a;
uint16_t b[16];
uint8_t c[2];
} test_struct_t;
__attribute__((section("test_section")))
test_struct_t test_struct;
int main(int argc, char** argv) {
printf("size:%x, sizeof(test_struct_t));
}
After compiling under MinGW [gcc.exe (Rev2, Built by MSYS2 project) 7.1.0] the
size reported by the program are 0x24 which is correct, however
objdump reports the section size to be 0x40 (which is a problem for my linker
script)
I did compile the same program under both Clang/Win32 and GCC/Linux and the
section has correct size of 0x24 in both cases.
Adding align(1) attribute to the data definition is a workaround, that fixes
the problem, but due to external factors I want to avoid adding it, if possible.
This behavior looks as a bug to me, but I can't say for sure.
Anyhow - is there some other (than the align(1) attribute) approach that this
behavior can be changed? Compiler option maybe?
Pozdrawiam / Kind Regards
Piotr Madaliński
Software Engineer
ZF TRW
Active & Passive Safety Technology
TRW Polska, Czestochowa Engineering Center
ul. Rolnicza 33, 42-200 Czestochowa / Poland
Phone +48 34 343 4864
piotr.madalin...@zf.com<mailto:piotr.madalin...@zf.com>
TRW Polska Sp. z o.o., ul. Rolnicza 33, 42-200 Czestochowa,
Sad Rejonowy w Czestochowie, KRS nr 0000077409
NIP nr 573-010-52-34, kapital zakladowy: 79.581.975 PLN
TRW Polska Sp. z o.o. Rolnicza 33 Str., 42-200 Czestochowa, Poland
District Court for Czestochowa, KRS no. 0000077409,
tax identification no. NIP 573-010-52-34, share capital: 79.581.975 PLN
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