[gjs: 1/2] build: SpiderMonkey sanity check

[Cosimo Cecchi <cosimoc src gnome org>]

commit a964366bfcd296d276223b2bd63dae0fa7fa4a1e
Author: Philip Chimento <philip chimento gmail com>
Date:   Sat Mar 17 22:53:22 2018 -0700

    build: SpiderMonkey sanity check
    
    This attempts to detect the situation where the one remaining patch
    that's required for SpiderMonkey 52 isn't applied. This can happen when
    someone is compiling their own SpiderMonkey from the Firefox sources and
    doesn't realize that it's broken.
    
    Closes #128.

 configure.ac | 59 ++++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 42 insertions(+), 17 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 3a003e2..c7b7dcb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -78,6 +78,48 @@ PKG_CHECK_MODULES([GJS_GDBUS], [$gjs_base_packages])
 PKG_CHECK_MODULES([GJS_CONSOLE], [$gjs_base_packages])
 PKG_CHECK_MODULES([GJSTESTS], [$gjstests_packages])
 
+CPPFLAGS_save="$CPPFLAGS"
+CPPFLAGS="$GJS_CFLAGS"
+LIBS_save="$LIBS"
+LIBS="$GJS_LIBS"
+
+dnl If SpiderMonkey was compiled with --enable-debug, then we need to define
+dnl -DDEBUG before including js-config.h.
+AC_MSG_CHECKING([whether SpiderMonkey was configured with --enable-debug])
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <js-config.h>
+#ifdef JS_DEBUG
+#error debug yes, if we didn't already error out due to DEBUG not being defined
+#endif
+]])], [
+  AC_MSG_RESULT([no])
+  GJS_DEBUG_DEF=
+], [
+  AC_DEFINE([HAVE_DEBUG_SPIDERMONKEY], [1],
+    [Define to 1 if SpiderMonkey was compiled with --enable-debug])
+  GJS_DEBUG_DEF='#define DEBUG 1'
+  AC_MSG_RESULT([yes])
+])
+
+# Sanity check for SpiderMonkey
+AC_MSG_CHECKING([if a minimal SpiderMonkey program compiles and runs])
+AC_RUN_IFELSE([AC_LANG_PROGRAM([
+$GJS_DEBUG_DEF
+#include <js/Initialization.h>
+  ], [
+if (!JS_Init()) exit(1);
+JS_ShutDown();
+  ])],
+  [AC_MSG_RESULT([yes])],
+  [AC_MSG_RESULT([no])
+    AC_MSG_ERROR([Check if you are using the recommended configuration for
+SpiderMonkey. See the file org.gnome.Sdk.json.in in
+https://gitlab.gnome.org/GNOME/gnome-sdk-images])],
+  [AC_MSG_RESULT([cross-compiling, unable to determine])])
+
+LIBS="$LIBS_save"
+CPPFLAGS="$CPPFLAGS_save"
+
 # Optional cairo dep (enabled by default)
 AC_ARG_WITH(cairo,
   [AS_HELP_STRING([--without-cairo], [Don't build cairo module])])
@@ -205,23 +247,6 @@ AC_ARG_ENABLE([Bsymbolic],
 AS_IF([test "x$enable_Bsymbolic" != "xno"],
   [AX_APPEND_LINK_FLAGS([-Bsymbolic-functions])])
 
-dnl If SpiderMonkey was compiled with --enable-debug, then we need to define
-dnl -DDEBUG before including js-config.h.
-AC_MSG_CHECKING([whether SpiderMonkey was configured with --enable-debug])
-CPPFLAGS_save="$CPPFLAGS"
-CPPFLAGS="$GJS_CFLAGS"
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
-#include <js-config.h>
-#ifdef JS_DEBUG
-#error debug yes, if we didn't already error out due to DEBUG not being defined
-#endif
-]])], [AC_MSG_RESULT([no])], [
-  AC_DEFINE([HAVE_DEBUG_SPIDERMONKEY], [1],
-    [Define to 1 if SpiderMonkey was compiled with --enable-debug])
-  AC_MSG_RESULT([yes])
-])
-CPPFLAGS="$CPPFLAGS_save"
-
 dnl
 dnl Check for -fsanitize=address and -fsanitize=undefined support
 dnl