c/1982: gcc treating "extern __inline__ asmfn (...) {...}" in <asm/bitops.h> as undefined

[prasad at watson dot ibm dot com]

>Number:         1982
>Category:       c
>Synopsis:       gcc treating "extern __inline__ asmfn (...) {...}" in <asm/bitops.h> as undefined
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Feb 14 09:36:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     V Guruprasad (prasad)
>Release:        gcc version 2.96 20000731 (rh7.0); also gcc version 2.97 20010212 (experimental) (on your webpage)
>Organization:
>Environment:
Redhat 7.0 on IBM Mpro Intellistation (Pentium II)
>Description:
Should have compiled and linked without fuss.
------
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.0)
 /usr/lib/gcc-lib/i386-redhat-linux/2.96/cpp0 -lang-c -v -D__GNUC__=2 -D__GNUC_MINOR__=96 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem(posix) -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -D__tune_i386__ foo.c foo.i
GNU CPP version 2.96 20000731 (Red Hat Linux 7.0) (cpplib)
 (i386 Linux/ELF)
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/usr/i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc-lib/i386-redhat-linux/2.96/include
 /usr/include
End of search list.
 /usr/lib/gcc-lib/i386-redhat-linux/2.96/cc1 foo.i -quiet -dumpbase foo.c -version -o foo.s
GNU C version 2.96 20000731 (Red Hat Linux 7.0) (i386-redhat-linux) compiled by GNU C version 2.96 20000731 (Red Hat Linux 7.0).
 as -V -Qy -o foo.o foo.s
GNU assembler version 2.10.90 (i386-redhat-linux) using BFD version 2.10.0.18
 /usr/lib/gcc-lib/i386-redhat-linux/2.96/collect2 -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crt1.o /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crti.o /usr/lib/gcc-lib/i386-redhat-linux/2.96/crtbegin.o -L/usr/lib/gcc-lib/i386-redhat-linux/2.96 -L/usr/lib/gcc-lib/i386-redhat-linux/2.96/../../.. foo.o -lgcc -lc -lgcc /usr/lib/gcc-lib/i386-redhat-linux/2.96/crtend.o /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crtn.o
foo.o: In function `main':
foo.o(.text+0x11): undefined reference to `test_and_set_bit'
collect2: ld returned 1 exit status
>How-To-Repeat:
Here is the source code:
------------------------
// #define extern 	/* uncomment for workaround!*/
#include <asm/bitops.h>

typedef volatile int    lockw_t;
lockw_t mylock;

main () {
        printf ("%d\n", (test_and_set_bit (0, &mylock) != 0));
        return 0;
        }
>Fix:
Compiles fine on uncommenting "#define extern" line.
This bug didn't exist on my Redhat 6.2 and aix4.3
 (gcc 2.95), so this must be something new. Suspect
code generation optimisation of inlines.
>Release-Note:
>Audit-Trail:
>Unformatted: