Copy uninit.c$,$ look at the code. Compile with gcc$,$ run it a few times. Do the same with tcc$,$

Q$1$ What did you observe? What did you expect?

The code for uninit.c is below:

uninit $-$ check to see which compilers do what with

$+$unitialised variables

OCT $2020$

$*/$

#include $x\%\frac{f}{?}$

$ix\%\frac{f}{?}$

$,$quad $i,x$

Compile sphere.c with gcc:

$ gcc sphere.c $-$o sphere

Now compile sphere$-$pow.c with gcc:

$ gcc sphere$-$pow.c $-$o sphere

$/$tmp$/$ccj$8$YBDC$.$o: In function 'main':

sphere$-$pow.c:$(.$text$+0$x$9$e$)$: undefined reference to 'pow'

collect$2$: error: ld returned $1$ exit status

This is a linker error, not a compiler error.

Doesn't refer to a line #

Mentions an object $(.$o$)$ file $($this is a temporary one$)$

o It tells you so: $"$ld $[$the linker$]$ returned..."

$ gcc sphere$-$pow.c $-$o sphere $-1$m

To be faster, tcc doesn't call ld; it does the linking itself. tcc won't find atan without help:

$ tcc sphere$-$pow.c $-$o sphere $-1$m

Copy uninit.c$,$ look at the code. Compile with gcc$,$ run it a few times. Do the same with tcc$,$

Q$1$ What did you observe? What did you expect?

In short, do not rely on default values. Initialise your variables.you expect?