add an openmp version of hello world ;)

.gitignore

@@ -30,3 +30,4 @@ av-variance
 undefined-behaviour
 multibrot-openmp
 multibrot-openmp.png
+hello-openmp

Makefile

@@ -5,7 +5,7 @@ CFLAGS=-std=c99 -Wextra -pedantic -g -O0
 CC_OPENMP=gcc # no OpenMP in our clang
 CFLAGS_OPENMP=$(CFLAGS) -fopenmp
 
-TARGETS=approximate-pi linked-list mandelbrot threads circular-buffer structs ncurses-pong bit-fuckery bit-fuckery2 checkcheck multibrot bloom wo-lernen lua-foo binsearch test-inline-assembly uiowa-threads-example mtrace-test av-variance undefined-behaviour multibrot-openmp
+TARGETS=approximate-pi linked-list mandelbrot threads circular-buffer structs ncurses-pong bit-fuckery bit-fuckery2 checkcheck multibrot bloom wo-lernen lua-foo binsearch test-inline-assembly uiowa-threads-example mtrace-test av-variance undefined-behaviour multibrot-openmp hello-openmp
 EXTRAS=mandelbrot.bmp multibrot.png test-inline-assembly.s tags mtrace-test.trace mtrace-test.txt
 
 .PHONY: all
@@ -67,5 +67,8 @@ uiowa-threads-example: uiowa-threads.o uiowa-threads-example.c
 av-variance: av-variance.c
 	$(CC) $(CFLAGS) -o $@ $< -lm
 
+hello-openmp: hello-openmp.c
+	$(CC_OPENMP) $(CFLAGS_OPENMP) -o $@ $<
+
 multibrot-openmp: multibrot-openmp.c
 	$(CC_OPENMP) $(CFLAGS_OPENMP) -o $@ $< -lm -lpng

hello-openmp.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main(void) {
+  #pragma omp parallel
+    printf("Hello, world.\n");
+  return 0;
+}