FWIW, I get the same result if using GCC.
On 28 Mar 2022, at 16:43, Ron Olson wrote:
Hey all-
I’m unable to build Swift on Fedora 36 and Rawhide while it does
build on F35. I’ve been able to condense the entire issue down to
the following sample code that demonstrates the problem:
nothing.S:
#define ASM_TYPE_FUNCTION(symbol) .type symbol, %function
#define ASM_SIZE(symbol) .size symbol, .-symbol
#define ASM_SYMBOL(symbol) symbol
#define ASM_WRAPPER_NAME(symbol) __interceptor_##symbol
.comm _ZN14__interception10real_vforkE,8,8
.globl ASM_WRAPPER_NAME(vfork)
ASM_TYPE_FUNCTION(ASM_WRAPPER_NAME(vfork))
ASM_WRAPPER_NAME(vfork):
// Commenting out the line below makes it work
call *_ZN14__interception10real_vforkE(%rip)
ASM_SIZE(vfork)
And compiling this code with:
clang++ -fPIC -shared ./nothing.S
Results in the error:
/usr/bin/ld: /tmp/fun-1b3a0d.o: warning: relocation against
`_ZN14__interception10real_vforkE' in read-only section `.text'
/usr/bin/ld: /tmp/fun-1b3a0d.o: relocation R_X86_64_PC32 against
symbol `_ZN14__interception10real_vforkE' can not be used when making
a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: bad value
The issue is that I’m explicitly passing -fPIC but it seems to
either be ignored or overridden somehow. I’m not well versed on
assembly to make any kind of educated guess about what might be the
problem/solution so I’m hoping someone more familiar might be able
to shed some light on the issue.
Thanks!
Ron
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