From 699ed0a112df7470e554f23561af1d78c784dc4f Mon Sep 17 00:00:00 2001
From: Michael Forney <mforney@mforney.org>
Date: Sun, 14 Feb 2021 03:34:09 -0800
Subject: file: Use tool built for host to generate magic.mgc

It turns out file has an undocumented define COMPILE_ONLY that
enables building a tool to just generate the magic database with a
minimal set of sources. Use that to build a tool for the host system
to avoid version incompatibilities.

Fixes #24.
---
 pkg/file/.gitignore |  1 +
 pkg/file/gen.lua    | 17 ++++++++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 pkg/file/.gitignore

(limited to 'pkg')

diff --git a/pkg/file/.gitignore b/pkg/file/.gitignore
new file mode 100644
index 00000000..b38f5394
--- /dev/null
+++ b/pkg/file/.gitignore
@@ -0,0 +1 @@
+/host.ninja
diff --git a/pkg/file/gen.lua b/pkg/file/gen.lua
index 626b044d..b1cc4a28 100644
--- a/pkg/file/gen.lua
+++ b/pkg/file/gen.lua
@@ -38,8 +38,23 @@ exe('file', {'src/file.c', 'src/seccomp.c', 'libmagic.a', '$builddir/pkg/zlib/li
 file('bin/file', '755', '$outdir/file')
 man{'$outdir/file.1'}
 
-rule('magic', 'cd $outdir && file -C -m magic')
+sub('host.ninja', function()
+	toolchain(config.host)
+	cflags{
+		'-I $outdir/include',
+		'-D HAVE_STDINT_H',
+		'-D HAVE_INTTYPES_H',
+		'-D HAVE_UNISTD_H',
+		'-D COMPILE_ONLY',
+		([[-D 'VERSION="%s"']]):format(version),
+	}
+	set('outdir', '$outdir/host')
+	exe('magic', 'src/(magic.c apprentice.c encoding.c print.c funcs.c cdf_time.c)')
+end)
+
+rule('magic', 'cd $outdir && ./host/magic magic')
 build('magic', '$outdir/magic.mgc', {'|',
+	'$outdir/host/magic',
 	copy('$outdir/magic', '$srcdir/magic/Magdir', lines('magic.txt')),
 	copy('$outdir/magic', '$srcdir/magic', {'Header', 'Localstuff'}),
 })
-- 
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