2 # YES, THIS NEEDS BASH, NOT /bin/sh (e.g. for <<<).
4 # Copyright (2013) Jann Horn <jann@thejh.net>
6 # -f for files with weird names
7 # -u for coding mistakes (or against, to be precise)
8 # -e and -o pipefail so that we don't have to spam the code with error handling
9 set -f -u -e -o pipefail
11 # flags for the build - adjust for your needs
12 # delete all the generated stuff afterwards (with `rm -r gen`)
14 CFLAGS='-O3 -Wall -Werror -fPIC -std=c99 -march=native'
16 # create build environment if it doesn't exist yet
17 mkdir -p gen # contains all generated files
18 mkdir -p gen/realc # source files, with our preprocessing applied
19 mkdir -p gen/realc_preprocessed # source files, preprocessed by the C compiler
20 mkdir -p gen/chash # hashes of the preprocessed C files used to generate files in gen/obj
21 mkdir -p gen/obj # object files
23 echo "welcome. your friendly compiler will be \"$CC\" today." >&2
24 echo "going ahead with CFLAGS=\"$CFLAGS\"..." >&2
27 cat header.h > gen/jh.h
28 for source_file in $(ls|grep '\.c$'); do
29 echo "extracting header data from $source_file..." >&2
30 source_name="$(sed 's|\.c$||' <<< "$source_file")"
31 echo "/* ----======== $source_name ========---- */"
34 sed 's|^PUBLIC_FN \(.*\){|KEEPLINE \1;|g' |
35 sed 's|^PUBLIC_CONST |KEEPLINE #define |g' |
36 sed 's|^HEADER |KEEPLINE |g' |
37 (set +e +o pipefail; grep '^KEEPLINE'; exit 0) |
44 # preprocess all source files
45 for source_file in $(ls|grep '\.c$'); do
46 echo "handling source file $source_file..." >&2
47 source_name="$(sed 's|\.c$||' <<< "$source_file")"
49 # do our own preprocessing
50 echo '#include "../jh.h"' > "gen/realc/$source_name.c"
53 (set +e +o pipefail; grep -v '^PUBLIC_CONST '; exit 0) |
54 sed 's|^PUBLIC_FN ||g' |
55 (set +e +o pipefail; grep -v '^HEADER '; exit 0) |
56 sed 's| *JH_ATTR_[A-Z_]*||g' |
57 cat >> "gen/realc/$source_name.c"
58 if [ $? -ne 0 ]; then exit 1; fi
60 # do the normal C preprocessing
61 echo 'preprocessing...' >&2
62 $CC -E "gen/realc/$source_name.c" > "gen/realc_preprocessed/$source_name.i"
64 # compile if there have been changes since the last time
65 echo -n 'checking sha checksum... ' >&2
66 file_hash="$(shasum "gen/realc_preprocessed/$source_name.i" | cut -d' ' -f1)"
67 # drop errors: that file might well be missing
69 last_file_hash="$(cat "gen/chash/$source_name" 2>/dev/null)"
71 if [ "$file_hash" = "$last_file_hash" ]; then
72 echo 'unchanged, will not compile again' >&2
74 echo 'changed – recompiling.' >&2
75 $CC $CFLAGS -c -o "gen/obj/$source_name.o" "gen/realc_preprocessed/$source_name.i"
76 echo "$file_hash" > "gen/chash/$source_name"
82 $CC -shared -Wl,-soname,libjh.so -o ../libjh.so $(ls)