configure: add asmjs-unknown-emscripten target

.github/workflows/main.yml

@@ -49,7 +49,7 @@ jobs:
       - name: Build
         run: |
           source ./emsdk/emsdk_env.sh
-          emconfigure ./configure --without-cairo --without-opengl --without-x --disable-readline
+          emconfigure ./configure --without-cairo --without-opengl --without-x --disable-readline --target=asmjs-unknown-emscripten
           emmake make
       - name: archive wasm bundle
         uses: actions/upload-artifact@v3

configure

@@ -9,4 +9,4 @@
 # script itself.  It also sets up CFLAGS without the default optimizer
 # flag (-O2).
 
-( CFLAGS="-g -Wno-int-conversion -Wno-implicit-int"; export CFLAGS; cd scripts ; ./configure "$@" )
+( CFLAGS="-g"; export CFLAGS; cd scripts ; ./configure "$@" )

scripts/configure

@@ -7773,12 +7773,12 @@ fi
 case $target in
   *-linux*)
     $as_echo "#define linux 1" >>confdefs.h
-
+    $as_echo "#define SYSV 1" >>confdefs.h
         $as_echo "#define ISC 1" >>confdefs.h
 
         case $target in
 	*x86_64*)
-	    CFLAGS="${CFLAGS} -fPIC -Werror=implicit-function-declaration"
+	    CFLAGS="${CFLAGS} -m64 -fPIC -Werror=implicit-function-declaration"
 	    ;;
     esac
     if test $usingOGL ; then
@@ -7790,6 +7790,10 @@ case $target in
       gr_libs="$gr_libs -lbsd"
     fi
     ;;
+  *-emscripten*)
+    $as_echo "#define linux 1" >>confdefs.h
+    CFLAGS="${CFLAGS} -fPIC -Werror=implicit-function-declaration -Wno-int-conversion -Wno-implicit-int"
+    ;;
   *solaris*)
     $as_echo "#define SYSV 1" >>confdefs.h
 

scripts/configure.in

@@ -1353,6 +1353,7 @@ dnl ----------------------------------------------------------------
 case $target in
   *-linux*)
     AC_DEFINE(linux)
+    AC_DEFINE(SYSV)
     dnl Defining "ISC" prevents compiler failure on redefinition of "wchar_t"
     AC_DEFINE(ISC)
     dnl 64-bit support for AMD Opteron
@@ -1370,6 +1371,10 @@ case $target in
       gr_libs="$gr_libs -lbsd"
     fi
     ;; 
+  *-emscripten*)
+    AC_DEFINE(linux)
+    CFLAGS="${CFLAGS} -fPIC -Werror=implicit-function-declaration -Wno-int-conversion -Wno-implicit-int"
+    ;;
   *solaris*)
     AC_DEFINE(SYSV)
     ;;

utils/signals.c

@@ -54,7 +54,7 @@ static char rcsid[] __attribute__ ((unused)) = "$Header: /usr/cvsroot/magic-8.0/
 #define SIGIOT SIGABRT	/* io-trap signal redefined */
 #endif
 
-#ifdef	linux
+#if defined(linux) || defined(EMSCRIPTEN)
 #if SIGBUS == SIGUNUSED
 #undef SIGBUS
 #define SIGBUS SIGUSR1
@@ -547,7 +547,7 @@ sigCrash(signum)
     char *msg;
     extern bool AbortFatal;
 
-#ifndef	linux
+#if !defined(linux) && !defined(EMSCRIPTEN)
     if (magicNumber == 1239987) {
 	/* Things aren't screwed up that badly, try to reset the terminal */
 	magicNumber = 0;