Simplified SConstruct tools and solved compilation issue

1. Using the `LINKFLAGS=''` instead of the `parse_flags` argument helped with a
`-lgcc_s not found` error that prevented linking.

2. The simplification was to only use the necessary tools (not the default toolset).
This should hopefully be clearer than the previous iterations.

All the executables compile correctly in the container.

TODO: check that compilation works on Windows.

SConstruct

@@ -10,12 +10,10 @@ To run the compilation for all implementations in one language, e.g. C, run the
 from pathlib import Path
 import os
 
-env = Environment(ENV={'PATH': os.environ['PATH']})
+env = Environment(ENV={'PATH': os.environ['PATH']},
+		  tools=['gcc', 'gnulink', 'g++'])
 
-env['CC'] = 'gcc'
 env['AS'] = 'as'
-for tool in ['gcc','gnulink']:
-   env.Tool(tool)
 env['CCFLAGS'] = ''
 env['CXXFLAGS'] = '-std=c++17'
 

contents/cooley_tukey/code/asm-x64/SConscript

@@ -3,4 +3,4 @@ from pathlib import Path
 
 dirname = Path.cwd().parents[1].stem
 
-env.X64(f'#/build/asm-x64/{dirname}', Glob('*.s'), LIBS=['m'], parse_flags="-Wl,-no-pie")
+env.X64(f'#/build/asm-x64/{dirname}', Glob('*.s'), LIBS=['m'], LINKFLAGS='-no-pie')

contents/forward_euler_method/code/asm-x64/SConscript

@@ -3,4 +3,4 @@ from pathlib import Path
 
 dirname = Path.cwd().parents[1].stem
 
-env.X64(f'#/build/asm-x64/{dirname}', Glob('*.s'), LIBS='m', parse_flags="-Wl,-no-pie")
+env.X64(f'#/build/asm-x64/{dirname}', Glob('*.s'), LIBS='m', LINKFLAGS='-no-pie')

sconscripts/asm-x64_SConscript

@@ -3,4 +3,4 @@ from pathlib import Path
 
 for file in files_to_compile:
     chapter_name = file.parent.parent.parent.stem
-    env.X64(f'#/build/{language}/{chapter_name}', str(file), parse_flags="-Wl,-no-pie")
+    env.X64(f'#/build/{language}/{chapter_name}', str(file), LINKFLAGS='-no-pie')