Having trouble getting b2sum to compile on OS X

[grempe]

I cannot get b2sum to compile on OS X (10.11.5 El Capitan). If I use the OS X command line compile tools installed with Xcode I see:

$ make
cc b2sum.c ../sse/blake2b.c ../sse/blake2s.c ../sse/blake2bp.c ../sse/blake2sp.c  -O3 -march=native -static -Werror=declaration-after-statement -std=c99 -I../sse -fopenmp  -o b2sum
clang: error: unsupported option '-fopenmp'
clang: error: unsupported option '-fopenmp'
clang: error: unsupported option '-fopenmp'
clang: error: unsupported option '-fopenmp'
clang: error: unsupported option '-fopenmp'
clang: error: unsupported option '-fopenmp'
make: *** [all] Error 1

If I try to use homebrew installed gcc I get:

$ export CC=/usr/local/bin/gcc-6
$ make
/usr/local/bin/gcc-6 b2sum.c ../sse/blake2b.c ../sse/blake2s.c ../sse/blake2bp.c ../sse/blake2sp.c  -O3 -march=native -static -Werror=declaration-after-statement -std=c99 -I../sse -fopenmp  -o b2sum
ld: library not found for -lcrt0.o
collect2: error: ld returned 1 exit status
make: *** [all] Error 1

Is this a bug, or am I doing it wrong?

[noloader]

Is this a bug, or am I doing it wrong?

This may be helpful: Creating static Mac OS X C build. Apparently, GCC does not support the configuration.

The trick to searching for this is to quote the library: "os x" brew ld: library not found for "-lcrt0.o". Otherwise, engines like Google think "all problems without the word lcrt0.o".

(My apologies for jumping in. The Mac port tools, like Macports and Brew, have caused me a fair amount of non-standard trouble over the years).

[sneves]

Removing the -fopenmp for Clang or the -static for GCC should work. With no -fopenmp you lose threading on `blake2xp``, but otherwise it should work fine.

[grempe]

Tried:

1. CLANG : removing the -fopenmp and just running make FAILED

$ make
cc b2sum.c ../sse/blake2b.c ../sse/blake2s.c ../sse/blake2bp.c ../sse/blake2sp.c  -O3 -march=native -static -Werror=declaration-after-statement -std=c99 -I../sse  -o b2sum
ld: library not found for -lcrt0.o
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [all] Error 1

2. GCC Removing the -static in line 5 WORKED!

$ export CC=/usr/local/bin/gcc-6

$ make
/usr/local/bin/gcc-6 b2sum.c ../sse/blake2b.c ../sse/blake2s.c ../sse/blake2bp.c ../sse/blake2sp.c  -O3 -march=native -Werror=declaration-after-statement -std=c99 -I../sse -fopenmp  -o b2sum

$ ./b2sum b2sum
04ec985c5d05d773db9c40e32e280e922772d0170dae94eaa97d4f257ebabffdb817a195ef610b35fd68096d322f91a4d4f1320d8841e8b8ae88bd57ff075e80  b2sum

3. CLANG : removing BOTH -static and -fopenmp and running make WORKED!

$ make
cc b2sum.c ../sse/blake2b.c ../sse/blake2s.c ../sse/blake2bp.c ../sse/blake2sp.c  -O3 -march=native -Werror=declaration-after-statement -std=c99 -I../sse  -o b2sum

$ ./b2sum b2sum
00551e8de9a471c267300315df1193077f5f943a111a8b0890ed5a5870507655d63a5828ff0862765526b4f792db0bd3540ee9f320ed9e840c750261196d6fd0  b2sum

$ git diff
diff --git a/b2sum/makefile b/b2sum/makefile
index 8558b2b..52e047c 100644
--- a/b2sum/makefile
+++ b/b2sum/makefile
@@ -2,8 +2,8 @@ PROG=b2sum
 PREFIX?=/usr/local
 MANDIR?=$(PREFIX)/man
 CC?=gcc
-CFLAGS?=-O3 -march=native -static -Werror=declaration-after-statement
-CFLAGS+=-std=c99 -I../sse -fopenmp
+CFLAGS?=-O3 -march=native -Werror=declaration-after-statement
+CFLAGS+=-std=c99 -I../sse
 LIBS=
 #FILES=b2sum.c ../ref/blake2b-ref.c ../ref/blake2s-ref.c ../ref/blake2bp-ref.c ../ref/blake2sp-ref.c
 FILES=b2sum.c ../sse/blake2b.c ../sse/blake2s.c ../sse/blake2bp.c ../sse/blake2sp.c

It would be great if the project would keep this issue open and modify the makefile so that it will remove those options when run on OS X if there are no major negatives to doing so.

Something along the lines of what is shown in this post might do the trick.

https://discussions.apple.com/thread/1945589?tstart=0

Thanks for the help.

[noloader]

Something along the lines of what is shown in this post might do the trick.
https://discussions.apple.com/thread/1945589?tstart=0

The tricks shown in the makefile require a portable make, like GNUmake or Dmake. I believe BLAKE2 uses Posix's make, which is anemic. Folks use often GNUmake or Dmake because Posix make is so anemic.

[grempe]

cc: @Scarletts

a559fae

[sneves]

5f2f566 disables -static, which wasn't really necessary, and makes -fopenmp optional with the NO_OPENMP flag. Use make NO_OPENMP=1 to build without it.

[grempe]

Thanks, make NO_OPENMP=1 works for me locally.

Perhaps this could be documented in a README.md in the b2sum dir for others? Unless you are very familiar with the nuances of the makefile most won't figure this out on their own...

[sneves]

cb0506c adds a small README that explains the available build options.

[grempe]

Thanks @sneves I think that tidies up this issue pretty well. Thanks for the help. Closing.