Port ctags+etags build to Sun C 5.12.

* .bzrignore: Remove lib-src/ctags.c.
* lib-src/Makefile.in (etags_args): Remove, replacing with ...
(etags_cflags, etags_libs): New macros.  All uses changed.
(ctags${EXEEXT}): Don't compile etags.c, as compiling etags.c in
parallel (once for ctags, once for etags) breaks parallel makes
with compilers that use the source file name to name temporaries,
such as Sun C 5.12.  Instead, compile ctags.c.
* lib-src/ctags.c: New file.

4 files changed, 24 insertions, 8 deletions

diff --git a/ChangeLog b/ChangeLog
index 1e6f9cdabd8..53ac1d96fde 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2014-05-18  Paul Eggert  <eggert@cs.ucla.edu>
 
+        Port ctags+etags build to Sun C 5.12.
+        * .bzrignore: Remove lib-src/ctags.c.
+
         Port recent libpng changes to hosts with missing png.h.
         * configure.ac (HAVE_PNG): Port to platforms where libpng-config
         succeeds but png.h is absent, by testing libpng-config's output
diff --git a/lib-src/ChangeLog b/lib-src/ChangeLog
index f571b401584..3fac70b3f73 100644
--- a/lib-src/ChangeLog
+++ b/lib-src/ChangeLog
@@ -1,3 +1,14 @@
+2014-05-18  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Port ctags+etags build to Sun C 5.12.
+        * Makefile.in (etags_args): Remove, replacing with ...
+        (etags_cflags, etags_libs): New macros.  All uses changed.
+        (ctags${EXEEXT}): Don't compile etags.c, as compiling etags.c in
+        parallel (once for ctags, once for etags) breaks parallel makes
+        with compilers that use the source file name to name temporaries,
+        such as Sun C 5.12.  Instead, compile ctags.c.
+        * ctags.c: New file.
+
 2014-05-04  Paul Eggert  <eggert@cs.ucla.edu>
 
         Handle systems without WCONTINUED consistently.  (Bug#15110, 17339)
diff --git a/lib-src/Makefile.in b/lib-src/Makefile.in
index 6f25d75db76..3009ff26745 100644
--- a/lib-src/Makefile.in
+++ b/lib-src/Makefile.in
@@ -311,18 +311,18 @@ regex.o: $(srcdir)/../src/regex.c $(srcdir)/../src/regex.h $(config_h)
 
 
 etags_deps = ${srcdir}/etags.c regex.o $(NTLIB) $(config_h)
-etags_args = -DEMACS_NAME="\"GNU Emacs\"" -DVERSION="\"${version}\"" \
-        ${srcdir}/etags.c regex.o $(LOADLIBES) $(NTLIB) -o $@
+etags_cflags = -DEMACS_NAME="\"GNU Emacs\"" -DVERSION="\"${version}\"" -o $@
+etags_libs = regex.o $(LOADLIBES) $(NTLIB)
 
 etags${EXEEXT}: ${etags_deps}
-        $(CC) ${ALL_CFLAGS} ${etags_args}
+        $(CC) ${ALL_CFLAGS} $(etags_cflags) $(srcdir)/etags.c $(etags_libs)
 
+## ctags.c is distinct from etags.c so that parallel makes do not write two
+## etags.o files on top of each other.
 ## FIXME?
-## Can't we use a symlink ctags -> etags, and make etags check for argv[0]?
-## Or a wrapper script that calls etags --ctags?
-ctags${EXEEXT}: ${etags_deps}
-        $(CC) ${ALL_CFLAGS} -DCTAGS ${etags_args}
-
+## Can't we use a wrapper that calls 'etags --ctags'?
+ctags${EXEEXT}: ctags.c ${etags_deps}
+        $(CC) ${ALL_CFLAGS} $(etags_cflags) $(srcdir)/ctags.c $(etags_libs)
 
 ebrowse${EXEEXT}: ${srcdir}/ebrowse.c ${srcdir}/../lib/min-max.h $(NTLIB) \
                    $(config_h)
diff --git a/lib-src/ctags.c b/lib-src/ctags.c
new file mode 100644
index 00000000000..0a6838a9dbb
--- /dev/null
+++ b/lib-src/ctags.c
@@ -0,0 +1,2 @@
+#define CTAGS 1
+#include "etags.c"