generate-objects

#!/usr/bin/env bash
set -eu

# CLI args.

# Each of those files contains n_ints_per_file ints.
n_int_files="${1:-10}"
n_ints_per_file="${2:-10}"

# Each function adds all ints from all files.
# This leads to n_int_files x n_ints_per_file x n_funcs relocations.
n_funcs="${3:-10}"

# Do a debug build, since it is for debug builds that link time matters the most,
# as the user will be recompiling often.
cflags='-ggdb3 -O0 -std=c99 -Wall -Wextra -pedantic'

# Cleanup previous generated files objects.
./clean-build

echo "Generate i_*.c, ints.h and int_sum.h"
rm -f ints.h
echo 'return' > int_sum.h
int_file_i=0
while [ "$int_file_i" -lt "$n_int_files" ]; do
  int_i=0
  int_file="${int_file_i}.c"
  rm -f "$int_file"
  while [ "$int_i" -lt "$n_ints_per_file" ]; do
    int_sym="i_${int_file_i}_${int_i}"
    echo "unsigned int ${int_sym} = ${int_file_i};" >> "$int_file"
    echo "extern unsigned int ${int_sym};" >> ints.h
    echo "${int_sym} +" >> int_sum.h
    int_i=$((int_i + 1))
  done
  int_file_i=$((int_file_i + 1))
done
echo '1;' >> int_sum.h

echo "Generate funcs.h and main.c."
rm -f funcs.h
cat <<EOF >main.c
#include "funcs.h"

int main(void) {
return
EOF
i=0
while [ "$i" -lt "$n_funcs" ]; do
  func_sym="f_${i}"
  echo "${func_sym}() +" >> main.c
  echo "int ${func_sym}(void);" >> funcs.h
  cat <<EOF >"${func_sym}.c"
#include "ints.h"

int ${func_sym}(void) {
#include "int_sum.h"
}
EOF
  i=$((i + 1))
done
cat <<EOF >>main.c
1;
}
EOF

echo "Generate *.o"
ls | grep -E '\.c$' | parallel --halt now,fail=1 --will-cite "gcc $cflags -c -o '{.}.o' '{}'"