[Bug c/49653] New: Undefined reference to inlined function with -O0,-std=c99
gary at intrepid dot com
gcc-bugzilla@gcc.gnu.org
Tue Jul 5 22:13:00 GMT 2011
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49653
Summary: Undefined reference to inlined function with
-O0,-std=c99
Product: gcc
Version: 4.5.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: gary@intrepid.com
Given,
$ cat -n inline_trouble.c
1 inline long trouble(long a, long b)
2 {
3 return a + b;
4 }
5
6 long two = 2;
7
8 int main()
9 {
10 long result = trouble(two, two);
11 return (int)result;
12 }
$ gcc --version
gcc (GCC) 4.5.1 20100924 (Red Hat 4.5.1-4)
This test compiles and links cleanly at -O2,-std=c99:
$ gcc -std=c99 -O2 inline_trouble.c
At -O0 -std=c99, it fails to link.
$ gcc -std=c99 -O0 inline_trouble.c
/tmp/ccXya7LE.o: In function `main':
inline_trouble.c:(.text+0x1d): undefined reference to `trouble'
collect2: ld returned 1 exit status
Note that gnu90 doesn't have this issue.
$ gcc -std=gnu90 -O0 inline_trouble.c
(Although GCC 4.5.1 is used in the test above, it is likely that this problem
can be reproduced with GCC built from the trunk.)
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