[PATCH v5 10/20] linux-user: Add build-vdso.sh tool

[Richard Henderson <richard.henderson@linaro.org>]

A shell script to build the vdso using the cross-compiler
makefile fragment.  If none detected, fall back to copying
the pre-build vdso from the source directory.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/build-vdso.sh | 31 +++++++++++++++++++++++++++++++
 linux-user/meson.build   |  1 +
 2 files changed, 32 insertions(+)
 create mode 100755 linux-user/build-vdso.sh

diff --git a/linux-user/build-vdso.sh b/linux-user/build-vdso.sh
new file mode 100755
index 0000000000..489088737f
--- /dev/null
+++ b/linux-user/build-vdso.sh
@@ -0,0 +1,31 @@
+#!/bin/sh
+# Build vdso using cross tools
+
+build_dir=error
+source_dir=error
+target_dir=error
+output=error
+
+while test $# -gt 0; do
+  opt="$1"
+  shift
+  case "$opt" in
+    -B) build_dir=$1; shift;;
+    -C) source_dir=$1; shift;;
+    -T) target_dir=$1; shift;;
+    -o) output=$1; shift;;
+    --) break;;
+  esac
+done
+
+frag="${build_dir}/tests/tcg/${target_dir}/config-target.mak"
+if ! test -f "$frag"; then
+  # No cross-compiler available
+  # Copy pre-build image into build tree
+  cp "${source_dir}/$(basename ${output})" "${output}"
+  exit $?
+fi
+
+# Extract cross-compiler from the makefile fragment, and build.
+CC=$(grep CC= "$frag" | sed s/CC=//)
+exec $CC -o "$output" $@
diff --git a/linux-user/meson.build b/linux-user/meson.build
index e4cb70ed2d..099e5c4fe0 100644
--- a/linux-user/meson.build
+++ b/linux-user/meson.build
@@ -30,6 +30,7 @@ linux_user_ss.add(when: 'CONFIG_ARM_COMPATIBLE_SEMIHOSTING', if_true: files('sem
 
 syscall_nr_generators = {}
 
+build_vdso_cmd = find_program('build-vdso.sh')
 gen_vdso_exe = executable('gen-vdso', 'gen-vdso.c',
                           native: true, build_by_default: false)
 gen_vdso = generator(gen_vdso_exe, output: '@BASENAME@.c.inc',
-- 
2.34.1