tcc: add "-Wl,-rpath=path" option (library search path)

Makefile

@@ -215,12 +215,12 @@ ifneq ($(BCHECK_O),)
 	$(INSTALL) -m644 $(BCHECK_O) "$(tccdir)"
 endif
 	$(INSTALL) -m644 $(addprefix include/,$(TCC_INCLUDES)) "$(tccdir)/include"
-	mkdir -p "$(docdir)"
-	$(INSTALL) -m644 tcc-doc.html "$(docdir)"
 	mkdir -p "$(libdir)"
 	$(INSTALL) -m644 libtcc.a "$(libdir)"
 	mkdir -p "$(includedir)"
 	$(INSTALL) -m644 libtcc.h "$(includedir)"
+	mkdir -p "$(docdir)"
+	-$(INSTALL) -m644 tcc-doc.html "$(docdir)"
 
 uninstall:
 	rm -fv $(foreach P,$(PROGS),"$(bindir)/$P")

tcc-doc.texi

@@ -284,6 +284,9 @@ libxxx.a. The library is searched in the paths specified by the
 Generate a shared library instead of an executable (@option{-o} option
 must also be given).
 
+@item -soname name
+set name for shared library to be used at runtime
+
 @item -static
 Generate a statically linked executable (default is a shared linked
 executable) (@option{-o} option must also be given).
@@ -310,6 +313,9 @@ Binary image (only for executable output)
 COFF output format (only for executable output for TMS320C67xx target)
 @end table
 
+@item -Wl,-rpath=path
+Set custom library search path
+
 @end table
 
 Debugger options:

tcc.c

@@ -442,6 +442,8 @@ int parse_args(TCCState *s, int argc, char **argv)
                         {
                             error("target %s not found", p);
                         }
+                    } else if (strstart(optarg, "-rpath=", &p)) {
+                        s->rpath = p;
                     } else {
                         error("unsupported linker option '%s'", optarg);
                     }

tcc.h

@@ -434,6 +434,8 @@ struct TCCState {
 
     /* soname as specified on the command line (-soname) */
     const char *soname;
+    /* rpath as specified on the command line (-Wl,-rpath=) */
+    const char *rpath;
 
     /* if true, all symbols are exported */
     int rdynamic;

tccelf.c

@@ -1563,6 +1563,10 @@ int elf_output_file(TCCState *s1, const char *filename)
                 if (dllref->level == 0)
                     put_dt(dynamic, DT_NEEDED, put_elf_str(dynstr, dllref->name));
             }
+
+            if (s1->rpath)
+                put_dt(dynamic, DT_RPATH, put_elf_str(dynstr, s1->rpath));
+
             /* XXX: currently, since we do not handle PIC code, we
                must relocate the readonly segments */
             if (file_type == TCC_OUTPUT_DLL) {
@@ -1570,7 +1574,6 @@ int elf_output_file(TCCState *s1, const char *filename)
                     put_dt(dynamic, DT_SONAME, put_elf_str(dynstr, s1->soname));
                 put_dt(dynamic, DT_TEXTREL, 0);
             }
-
             /* add necessary space for other entries */
             saved_dynamic_data_offset = dynamic->data_offset;
             dynamic->data_offset += sizeof(ElfW(Dyn)) * EXTRA_RELITEMS;