scons variables

Author: cirosantilli

c/interactive/subnormal.c

@@ -70,5 +70,9 @@ int main(void) {
     assert(0.0f < smallest_subnormal);
     assert(!isnormal(smallest_subnormal));
 
+    /* Check that we can add two submormals. */
+    float smallest_subnormal_2x = smallest_subnormal + smallest_subnormal;
+    assert(lkmc_float32_equal(smallest_subnormal_2x, 0, 0, 2));
+
     return EXIT_SUCCESS;
 }

scons/README.md

@@ -24,7 +24,7 @@ Tested on SCons v2.3.0.
 1.  [Install](install/)
 1.  Compiler parameters
     1.  [Define](define/)
-    1.  [CFLAGS](cflags/)
+    1.  [CCFLAGS](ccflags/)
 1.  Infrastructure
     1.  [test](test)
     1.  [clean](clean)

scons/cflags/README.md scons/ccflags/README.md

@@ -1,5 +1,5 @@
 env = Environment()
 std = ARGUMENTS.get('std', 'c99')
-env.Append(CCFLAGS=('-std=' + std))
 env.Append(CCFLAGS='-Werror')
+env.Append(CCFLAGS=('-std=' + std))
 env.Program(target='main.out', source=['main.c'])

scons/cflags/SConstruct scons/ccflags/SConstruct

@@ -0,0 +1,8 @@
+# Variables
+
+How to use `Variables` for setting command line variables and `Help`.
+
+Try out help with:
+
+    scons -h
+    scons -H

scons/cflags/main.c scons/ccflags/main.c

@@ -0,0 +1,13 @@
+variables = Variables(None, ARGUMENTS)
+variables.Add('X', 'Value of X', 1)
+variables.Add('Y', 'Value of Y', 2)
+env = Environment(variables=variables)
+env.Append(CPPDEFINES={
+    'X': '${X}',
+    'Y': '${Y}',
+})
+env.Program(
+    source=['main.c'],
+    target='main.out',
+)
+Help(variables.GenerateHelpText(env))

scons/cflags/test scons/ccflags/test

@@ -0,0 +1,3 @@
+int main(void) {
+    return X + Y;
+}

scons/variables/README.md

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+set -eu
+scons --clean
+scons
+./main.out
+[ $? = 3 ]
+scons --clean
+scons X=3 Y=4
+./main.out
+[ $? = 7 ]