configure: Introduce macro ae_in_git_repo

[babeltrace.git] / m4 / ae_in_git_repo.m4

diff --git a/m4/ae_in_git_repo.m4 b/m4/ae_in_git_repo.m4
new file mode 100644 (file)
index 0000000..2e370fb
--- /dev/null
+++ b/m4/ae_in_git_repo.m4
@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: MIT
+#
+# Copyright (C) 2021 Michael Jeanson <mjeanson@efficios.com>
+#
+# ae_in_git_repo.m4 -- Check if we are building from the git repo
+#
+# The cache variable for this test is `ae_cv_in_git_repo`.
+#
+# AE_IF_IN_GIT_REPO(ACTION-IF-TRUE, [ACTION-IF-FALSE])
+# ---------------------------------------------------------------------------
+AC_DEFUN([AE_IF_IN_GIT_REPO], [
+  AC_CACHE_VAL([ae_cv_in_git_repo], [
+
+      dnl We're in the Git repository; the `bootstrap` file
+      dnl is not distributed in tarballs
+      AS_IF([test -f "$srcdir/bootstrap"],
+        [ae_cv_in_git_repo=yes],
+        [ae_cv_in_git_repo=no])
+  ])
+
+  AS_IF([test "x$ae_cv_in_git_repo" = "xyes"], [dnl
+    $1
+  ], [: dnl
+    $2
+  ])
+])