Add an Android.bp to build flex

Test: prebuilts/build-tools/build-prebuilts.sh (on linux and mac)
Test: build flex with old and new binaries, outputs identical
Change-Id: I57407874f40bd08e828d9a5c03a1093d2640ae62

1 files changed, 70 insertions, 0 deletions

diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..5c3a879
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,70 @@
+cc_binary_host {
+    name: "flex",
+
+    stl: "none",
+    srcs: [
+        "ccl.c",
+        "dfa.c",
+        "ecs.c",
+        "scanflags.c",
+        "gen.c",
+        "main.c",
+        "misc.c",
+        "nfa.c",
+        "parse.y",
+        "scan.l",
+        "sym.c",
+        "tblcmp.c",
+        "yylex.c",
+        "options.c",
+        "scanopt.c",
+        "buf.c",
+        "tables.c",
+        "tables_shared.c",
+        "filter.c",
+        "regex.c",
+
+        ":flex_skel.c",
+    ],
+
+    cflags: [
+        "-DHAVE_ALLOCA=1",
+        "-DHAVE_LIMITS_H=1",
+        "-DHAVE_UNISTD_H=1",
+        "-DHAVE_NETINET_IN_H=1",
+        "-DHAVE_SYS_WAIT_H=1",
+        "-DHAVE_STDBOOL_H=1",
+        "-DHAVE_REGEX_H=1",
+        "-DSTDC_HEADERS=1",
+        "-DVERSION=\"2.5.39\"",
+
+        // TODO: This should use a hermetic m4 -- this is a default that can be overwritten
+        // overwritten with the M4 environment variable, which may be simpler within the build.
+        "-DM4=\"m4\"",
+
+        "-Wno-unused-parameter",
+        "-Wno-unused-variable",
+        "-Wno-unused-label",
+
+        "-Wno-error=dangling-else",
+        "-Wno-error=incompatible-pointer-types-discards-qualifiers",
+        "-Wno-error=int-conversion",
+    ],
+}
+
+genrule {
+    name: "flex_skel.c",
+    // This is lightly modified from Makefile.am
+    cmd: "sed 's/m4_/m4postproc_/g; s/m4preproc_/m4_/g' $(in) | m4 -P -I $$(dirname $(in)) -DFLEX_MAJOR_VERSION=2 -DFLEX_MINOR_VERSION=5 -DFLEX_SUBMINOR_VERSION=39 | sed 's/m4postproc_/m4_/g' | /bin/bash $(location mkskel.sh) >$(out)",
+    tool_files: [
+        "mkskel.sh",
+        "flexint.h",
+        "tables_shared.h",
+    ],
+    srcs: [
+        "flex.skl",
+    ],
+    out: [
+        "skel.c",
+    ],
+}