cmake: always built with cmake build-style

Less cursed template (changed build-style for cross-compiling).

srcpkgs/cmake/patches/no-run-cmake-bootstrap.patch

@@ -0,0 +1,13 @@
+We will run cmake ourselves with our flags
+Index: cmake-3.20.3/bootstrap
+===================================================================
+--- cmake-3.20.3.orig/bootstrap
++++ cmake-3.20.3/bootstrap
+@@ -1968,6 +1968,7 @@ export CFLAGS
+ export CXXFLAGS
+ export LDFLAGS
+ 
++exit 0
+ # Run bootstrap CMake to configure real CMake
+ cmake_options="-DCMAKE_BOOTSTRAP=1"
+ if test -n "${cmake_verbose}"; then

srcpkgs/cmake/template

@@ -1,11 +1,11 @@
 # Template file for 'cmake'
+# FIXME: cmake is being rebuilt on do_install
 pkgname=cmake
 version=3.20.3
 revision=1
-build_style=configure
+build_style=cmake
-configure_args="--prefix=/usr --mandir=/share/man --docdir=/share/doc/cmake
+configure_args="-DCMAKE_DOC_DIR=/share/doc/cmake
- --system-libs ${XBPS_MAKEJOBS:+--parallel=$XBPS_MAKEJOBS}"
+ -DCMAKE_USE_SYSTEM_LIBRARIES=ON -DKWSYS_LFS_WORKS=1"
-make_check_target=test
 hostmakedepends="gcc-fortran"
 makedepends="expat-devel libarchive-devel libcurl-devel libuv-devel
  ncurses-devel rhash-devel jsoncpp-devel"
@@ -18,13 +18,32 @@ distfiles="https://www.cmake.org/files/v${version%.*}/${pkgname}-${version}.tar.
 checksum=4d008ac3461e271fcfac26a05936f77fc7ab64402156fb371d41284851a651b8
 replaces="cmake-bootstrap>=0"
 
+# XXX: cmake is broken if cmake was built with -GNinja
+# https://bugs.gentoo.org/596460
+export CMAKE_GENERATOR="Unix Makefiles"
+make_cmd=make
+
 if [ "$CROSS_BUILD" ]; then
-	build_style=cmake
 	hostmakedepends+=" cmake"
-	configure_args="-DCMAKE_DOC_DIR=/share/doc/cmake
-	 -DCMAKE_USE_SYSTEM_LIBRARIES=ON -DKWSYS_LFS_WORKS=1"
 fi
 
+pre_configure() {
+	local f
+	[ ! "$CROSS_BUILD" ] || return 0
+	mkdir -p build
+	cd build
+	../bootstrap --no-system-libs \
+		${XBPS_MAKEJOBS:+--parallel=$XBPS_MAKEJOBS}
+	# Make sure build directory is clean
+	for f in *; do
+		if [ "$f" != Bootstrap.cmk ]; then
+			return 1
+		fi
+	done
+	cd ${wrksrc}
+	PATH="${wrksrc}/build/Bootstrap.cmk:$PATH"
+}
+
 post_install() {
 	rm -rf ${DESTDIR}/usr/share/doc/cmake
 	sed -n -e '/Copyright/,/authorization[.]/p' \