Build failure with clang about openlibm

[vtjnash]

It should be OK to just delete those lines. (by which I mean I don't know what they really do)
it is caused by this: __weak_reference(__isinff, isinff);
from the definition of weak reference in: https://github.com/JuliaLang/openlibm/blob/master/include/cdefs-compat.h

[Keno]

IIRC those are debug directives, so it should be fine to delete them (or comment them out) for now. If we run into any problems while debugging we can always take a second look.

[vtjnash]

I though it was a linker command that controls the symbol's scope and allows it to finish compiling when there would otherwise be conflicts with certain built-in functions. But my research may very well be completely faulty.

[ViralBShah]

That does sound like a likely explanation.

-viral

On 02-Jul-2012, at 8:54 PM, Jameson Nash wrote:

I though it was a linker command that controls the symbol's scope and allows it to finish compiling when there would otherwise be conflicts with certain built-in functions. But my research may very well be completely faulty.

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Reply to this email directly or view it on GitHub:
#9 (comment)

[ViralBShah]

If that is indeed the reason, then we may not be able to simply delete, right?

-viral

On 02-Jul-2012, at 8:54 PM, Jameson Nash wrote:

I though it was a linker command that controls the symbol's scope and allows it to finish compiling when there would otherwise be conflicts with certain built-in functions. But my research may very well be completely faulty.

---

Reply to this email directly or view it on GitHub:
#9 (comment)

[Keno]

It seems that we need to find the correct weak reference directives for the Mach-O binary format. I'm digging through the apple developer manual and it seems that there are the proper directives to do that, but their usage is a little different. I'll see if I can get it to work.

[Keno]

Ok, found it. This works, but I don't have git set up atm and I need to leave (be back in 30min), so feel free to apply in the meantime:

diff --git a/include/cdefs-compat.h b/include/cdefs-compat.h
index be310a1..81b1a62 100644
--- a/include/cdefs-compat.h
+++ b/include/cdefs-compat.h
@@ -49,6 +49,10 @@
        __asm__(".asciz \"msg\"");      \
        __asm__(".previous")
 #endif /* __STDC__ */
+#elif defined(__clang__)  /* !__ELF__ */
+#define __weak_reference(sym,alias)    \
+       __asm__(".weak_reference alias");\
+       __asm__(".set alias, sym")
 #else  /* !__ELF__ */
 #ifdef __STDC__
 #define __weak_reference(sym,alias)    \

[ViralBShah]

Actually, I get a link time failure

    LINK libopenlibm.dylib
<inline asm>:5:13: error: invalid reassignment of non-absolute variable 'alias'
.set alias, sym
            ^
LLVM ERROR: Error parsing inline asm

clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [libopenlibm.dylib] Error 1

[Keno]

Ah, yes. Inline assembly, not assembly by itself. Should be fixed.

[staticfloat]

I'm running into this again when trying to use gcc-5 on OSX to compile libopenlibm. This is killing my GCC-based OSX build that I'm trying to do.

$ make
/Applications/Xcode.app/Contents/Developer/usr/bin/make -C build/openlibm-3ee2a6e6a9fc68cbf2ab00f830b9059215e40b06/ ARCH="x86_64" CC="gcc-5" FC="gfortran -m64" AR="ar" OS="Darwin" USECLANG=0 USEGCC=1 DESTDIR="" prefix=/Users/sabae/src/julia/usr bindir=/Users/sabae/src/julia/usr/bin libdir=/Users/sabae/src/julia/usr/lib libexecdir=/Users/sabae/src/julia/usr/libexec datarootdir=/Users/sabae/src/julia/usr/share includedir=/Users/sabae/src/julia/usr/include sysconfdir=/Users/sabae/src/julia/usr/etc O=
gcc-5  -fno-gnu89-inline -std=c99 -Wall -O3 -I/Users/sabae/src/julia/deps/build/openlibm-3ee2a6e6a9fc68cbf2ab00f830b9059215e40b06 -I/Users/sabae/src/julia/deps/build/openlibm-3ee2a6e6a9fc68cbf2ab00f830b9059215e40b06/include -I/Users/sabae/src/julia/deps/build/openlibm-3ee2a6e6a9fc68cbf2ab00f830b9059215e40b06/ld80 -I/Users/sabae/src/julia/deps/build/openlibm-3ee2a6e6a9fc68cbf2ab00f830b9059215e40b06/amd64 -I/Users/sabae/src/julia/deps/build/openlibm-3ee2a6e6a9fc68cbf2ab00f830b9059215e40b06/src -DASSEMBLER -D__BSD_VISIBLE -Wno-implicit-function-declaration -fPIC -I/Users/sabae/local/include -I/usr/local/include -c src/s_isinf.c -o src/s_isinf.c.o
/var/folders/zk/nh41l40158l2hr22v7mhzf4c0000gn/T//ccpiR1KV.s:1:9: error: unsupported directive '.stabs'
        .stabs "_isinff",11,0,0,0
               ^
/var/folders/zk/nh41l40158l2hr22v7mhzf4c0000gn/T//ccpiR1KV.s:2:9: error: unsupported directive '.stabs'
        .stabs "___isinff",1,0,0,0
               ^
make[2]: *** [src/s_isinf.c.o] Error 1
make[1]: *** [build/openlibm-3ee2a6e6a9fc68cbf2ab00f830b9059215e40b06/libopenlibm.dylib] Error 2
make: *** [julia-deps] Error 2