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-rw-r--r--build/header.mk69
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diff --git a/build/header.mk b/build/header.mk
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+++ b/build/header.mk
@@ -0,0 +1,69 @@
+# Copyright © Tavian Barnes <tavianator@tavianator.com>
+# SPDX-License-Identifier: 0BSD
+
+# Makefile that generates gen/config.h
+
+include build/prelude.mk
+include gen/config.mk
+include build/exports.mk
+
+# All header fragments we generate
+HEADERS := \
+ gen/has/acl-get-entry.h \
+ gen/has/acl-get-file.h \
+ gen/has/acl-get-tag-type.h \
+ gen/has/acl-is-trivial-np.h \
+ gen/has/acl-trivial.h \
+ gen/has/aligned-alloc.h \
+ gen/has/confstr.h \
+ gen/has/extattr-get-file.h \
+ gen/has/extattr-get-link.h \
+ gen/has/extattr-list-file.h \
+ gen/has/extattr-list-link.h \
+ gen/has/fdclosedir.h \
+ gen/has/getdents.h \
+ gen/has/getdents64.h \
+ gen/has/getdents64-syscall.h \
+ gen/has/getprogname.h \
+ gen/has/getprogname-gnu.h \
+ gen/has/max-align-t.h \
+ gen/has/pipe2.h \
+ gen/has/posix-spawn-addfchdir.h \
+ gen/has/posix-spawn-addfchdir-np.h \
+ gen/has/st-acmtim.h \
+ gen/has/st-acmtimespec.h \
+ gen/has/st-birthtim.h \
+ gen/has/st-birthtimespec.h \
+ gen/has/st-flags.h \
+ gen/has/statx.h \
+ gen/has/statx-syscall.h \
+ gen/has/strerror-l.h \
+ gen/has/strerror-r-gnu.h \
+ gen/has/strerror-r-posix.h \
+ gen/has/tm-gmtoff.h \
+ gen/has/uselocale.h
+
+# Previously generated by pkgs.mk
+PKG_HEADERS := ${ALL_PKGS:%=gen/use/%.h}
+
+gen/config.h: ${PKG_HEADERS} ${HEADERS}
+ ${MSG} "[ GEN] $@"
+ printf '// %s\n' "$@" >$@
+ printf '#ifndef BFS_CONFIG_H\n' >>$@
+ printf '#define BFS_CONFIG_H\n' >>$@
+ cat ${.ALLSRC} >>$@
+ printf '#endif // BFS_CONFIG_H\n' >>$@
+ cat ${.ALLSRC:%=%.log} >$@.log
+ ${VCAT} $@
+.PHONY: gen/config.h
+
+# The short name of the config test
+SLUG = ${@:gen/%.h=%}
+
+${HEADERS}::
+ ${MKDIR} ${@D}
+ if build/define-if.sh ${SLUG} build/cc.sh build/${SLUG}.c >$@ 2>$@.log; then \
+ test "${IS_V}" || printf '[ CC ] %-${MSG_WIDTH}s ✔\n' ${SLUG}.c; \
+ else \
+ test "${IS_V}" || printf '[ CC ] %-${MSG_WIDTH}s ✘\n' ${SLUG}.c; \
+ fi