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Added -lpthread to makefile example in BuildSystem.md.

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Details:
- Added missing pthreads library linking to example makefile in
  docs/BuildSystem.md, as well as similar language to build requirements
  at the beginning of the document. Thanks to Stefanos Mavros for
  bringing this to our attention.
- Updated CREDITS file.
This commit is contained in:
Field G. Van Zee
2018-07-11 12:24:18 -05:00
parent bf10d8624e
commit 038442add3
2 changed files with 6 additions and 3 deletions
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8
docs/BuildSystem.md
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@@ -24,7 +24,9 @@ The BLIS build system was designed for use with GNU/Linux (or some other sane UN
* GNU `make`
* a working C compiler
We also require various other shell utilities that are so ubiquitous that they are not worth mentioning (such as `mv`, `mkdir`, `find`, and so forth). If you are missing these utilities, then you have much bigger problems than not being able to build BLIS.
BLIS also requires a POSIX threads library at link-time (`-lpthread` or `libpthread.so`). This requirement holds even when configuring BLIS with multithreading disabled (the default) or with multithreading via OpenMP (`--enable-multithreading=openmp`).
Finally, we also require various other shell utilities that are so ubiquitous that they are not worth mentioning (such as `mv`, `mkdir`, `find`, and so forth). If you are missing these utilities, then you have much bigger problems than not being able to build BLIS.
## Obtaining BLIS
@@ -337,13 +339,13 @@ Running the `distclean` target is like saying, "Remove anything ever created by
## Linking against BLIS
Once you have instantiated (configured, compiled, and installed) a BLIS library, you can link to it in your application's makefile as you would any other library. The following is an abbreviated makefile for a small hypothetical application that has just two external dependencies: BLIS and the standard C math library.
Once you have instantiated (configured and compiled, and perhaps installed) a BLIS library, you can link to it in your application's makefile as you would any other library. The following is an abbreviated makefile for a small hypothetical application that has just two external dependencies: BLIS and the standard C math library. We also link against libpthread since that library has been a runtime dependency of BLIS since 70640a3 (December 2017).
```make
BLIS_PREFIX = $(HOME)/blis
BLIS_INC = $(BLIS_PREFIX)/include/blis
BLIS_LIB = $(BLIS_PREFIX)/lib/libblis.a
OTHER_LIBS = -L/usr/lib -lm
OTHER_LIBS = -L/usr/lib -lm -lpthread
CC = gcc
CFLAGS = -O2 -g -I$(BLIS_INC)