2 # YES, THIS NEEDS BASH, NOT /bin/sh (e.g. for <<<).
4 # -f for files with weird names
5 # -u for coding mistakes (or against, to be precise)
6 # -e and -o pipefail so that we don't have to spam the code with error handling
7 set -f -u -e -o pipefail
9 # flags for the build - adjust for your needs
10 # delete all the generated stuff afterwards (with `rm -r gen`)
12 CFLAGS='-g -O0 -Wall -Werror -fPIC -std=c99'
14 # create build environment if it doesn't exist yet
15 mkdir -p gen # contains all generated files
16 mkdir -p gen/realc # source files, with our preprocessing applied
17 mkdir -p gen/realc_preprocessed # source files, preprocessed by the C compiler
18 mkdir -p gen/chash # hashes of the preprocessed C files used to generate files in gen/obj
19 mkdir -p gen/obj # object files
21 echo "welcome. your friendly compiler will be \"$CC\" today." >&2
22 echo "going ahead with CFLAGS=\"$CFLAGS\"..." >&2
25 for source_file in $(ls|grep '\.c$'); do
26 echo "extracting header data from $source_file..." >&2
27 source_name="$(sed 's|\.c$||' <<< "$source_file")"
28 echo "/* ----======== $source_name ========---- */"
31 sed 's|^PUBLIC_FN \(.*\){|KEEPLINE \1;|g' |
32 sed 's|^PUBLIC_CONST |KEEPLINE #define |g' |
33 sed 's|^HEADER |KEEPLINE |g' |
41 # preprocess all source files
42 for source_file in $(ls|grep '\.c$'); do
43 echo "handling source file $source_file..." >&2
44 source_name="$(sed 's|\.c$||' <<< "$source_file")"
46 # do our own preprocessing
47 echo '#include "../libjh.h"' > "gen/realc/$source_name.c"
50 grep -v '^PUBLIC_CONST ' |
51 sed 's|^PUBLIC_FN ||g' |
53 cat >> "gen/realc/$source_name.c"
54 if [ $? -ne 0 ]; then exit 1; fi
56 # do the normal C preprocessing
57 echo 'preprocessing...' >&2
58 $CC -E "gen/realc/$source_name.c" > "gen/realc_preprocessed/$source_name.i"
60 # compile if there have been changes since the last time
61 echo -n 'checking sha checksum... ' >&2
62 file_hash="$(shasum "gen/realc_preprocessed/$source_name.i" | cut -d' ' -f1)"
63 # drop errors: that file might well be missing
65 last_file_hash="$(cat "gen/chash/$source_name" 2>/dev/null)"
67 if [ "$file_hash" = "$last_file_hash" ]; then
68 echo 'unchanged, will not compile again' >&2
70 echo 'changed – recompiling.' >&2
71 $CC $CFLAGS -c -o "gen/obj/$source_name.o" "gen/realc_preprocessed/$source_name.i"
72 echo "$file_hash" > "gen/chash/$source_name"
78 $CC -shared -Wl,-soname,libjh.so -o ../libjh.so $(ls)