[PATCH/libgpg-error] syscfg: Add Emscript arch.

[NIIBE Yutaka]

Hello,

Thank you for your challenge.

Clément Péron wrote:
> * src/syscfg/lock-obj-pub.lock-obj-pub.wasm32-unknown-emscripten.h: New.
> * src/Makefile.am (lock_obj_pub): Add it.

Great.  I think that your intention is building gpg-error for the host
of wasm32-unknown-emscripten.

The files are src/syscfg/* are old ones by old method.  We moved to the
new method generating the header at build time, if possible.  We use
src/gen-lock-obj.sh for cross compiling.

With the patch (to relax a constraint of section .bss):
==========================
diff --git a/src/gen-lock-obj.sh b/src/gen-lock-obj.sh
index 6e78c5f..a8d9352 100755
--- a/src/gen-lock-obj.sh
+++ b/src/gen-lock-obj.sh
@@ -73,7 +73,7 @@ pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
 EOF
 
 if $CC -c conftest.$ac_ext; then :
-  ac_mtx_size=$($OBJDUMP -j .bss -t conftest.$ac_objext \
+  ac_mtx_size=$($OBJDUMP -t conftest.$ac_objext \
          | $AWK $AWK_OPTION '
 /mtx$/ { mtx_size = int("0x" $5) }
 END { print mtx_size }')
==========================

The command line:

    LOCK_ABI_VERSION=1 host=wasm32-unknown-emscripten \
    host_alias=wasm32_unknown-emscripten \
    CC=emcc OBJDUMP=llvm-objdump ac_ext=c ac_objext=o 
    AWK=gawk ./gen-lock-obj.sh

works well for me.  (I learned that wasm-objdump is not compatible to
GNU objdump, so, I use llvm-objdump here.)

So, I'm considering this patch to configure.ac:
==========================
diff --git a/configure.ac b/configure.ac
index d83e7e5..a339dba 100644
--- a/configure.ac
+++ b/configure.ac
@@ -632,7 +632,7 @@ if test x"$gl_use_threads" = xno; then
   AC_MSG_NOTICE([generated src/lock-obj-pub.native.h for $host])
 elif test x$cross_compiling = xyes; then
   case $host in
-    *-*-gnu* | *-*-linux-gnu* | *-*-linux-musl*)
+    *-*-gnu* | *-*-linux-gnu* | *-*-linux-musl* | wasm*)
     AC_CHECK_TOOL(OBJDUMP, [objdump])
     if test -n "$OBJDUMP"; then
       lock_obj_h_generated=yes
==========================

With those patches, by supplying CC=emcc OBJDUMP=llvm-objdump to
configure, we will be able to build for the host of
wasm32_unknown-emscripten.
--