[PATCH] configure.ac: add --with-bdw-gc option

[Mohammad-Reza Nabipoor]

This is useful in systems (like FreeBSD) which offer different
variants of Boehm-GC: bdw-gc and bdw-gc-threaded.

To compile on FreeBSD, we have to use the threaded variant:
  --with-bdw-gc=bdw-gc-threaded

2024-02-27  Mohammad-Reza Nabipoor  <mnabipoor@gnu.org>

        * configure.ac (BDW_GC): Add --with-bdw-gc to be able to specify
        a different pkg-config filename.
---
 ChangeLog    | 5 +++++
 configure.ac | 8 +++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 5c038cda..0bf1149e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2024-02-27  Mohammad-Reza Nabipoor  <mnabipoor@gnu.org>
+
+       * configure.ac (BDW_GC): Add --with-bdw-gc to be able to specify
+       a different pkg-config filename.
+
 2024-02-25  Mohammad-Reza Nabipoor  <mnabipoor@gnu.org>
 
        * libpoke/pkl.c (pkl_resolve_module): Handle failure of `asprintf'.
diff --git a/configure.ac b/configure.ac
index f0357c03..4f7b0c2d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -184,8 +184,14 @@ AC_SUBST([RAS_AWK])
 
 dnl The Boehm-Weiser garbage collector
 
+AC_ARG_WITH([bdw_gc],
+ [AS_HELP_STRING([--with-bdw-gc],
+   [name of BDW-GC pkg-config file (default is bdw-gc)])],
+ [bdw_gc="$withval"],
+ [bdw_gc=bdw-gc])
+
 PKG_PROG_PKG_CONFIG
-PKG_CHECK_MODULES(BDW_GC,[bdw-gc],[have_gc=yes],[have_gc=no])
+PKG_CHECK_MODULES(BDW_GC,[$bdw_gc],[have_gc=yes],[have_gc=no])
 
 dnl Jitter
 
-- 
2.43.2