Re: [RFA] testsuite/gdb.arch/i386-prologue.c: Fix compiling on Cygwin

[Corinna Vinschen <vinschen@redhat.com>]

On Jun 28 13:55, Michael Elizabeth Chastain wrote:
> > the gdb.arch/i386-prologue.c testcase doesn't compile on Cygwin since
> > on Cygwin the assenmbler labels need leading underscores to match the
> > same names in C.  The below patch fixes that.
> 
> I acknowledge the problem, but I don't like to see #ifdef __CYGWIN__
> in the middle of i386-prologue.c.  So I am declining this patch.
> 
> Can you add a layer to this?  Use a new symbol such as SYMBOL_PREFIX so
> that i386-prologue.exp can tell i386-prologue.c whether to add a leading
> underscore or not.

I've created a simpler patch using the SYMBOL(sym) suggestion you
mentioned in your other response.  Is the below patch ok?

	* gdb.arch/i386-prologue.c: Use preprocessor directives to
	conditionalize symbol prefixing.
	* gdb.arch/i386-prologue.exp: Allow symbol prefixing by adding
	additional_flags handling.  Add underscore prefix for Cygwin.

Corinna

Index: gdb.arch/i386-prologue.c
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.arch/i386-prologue.c,v
retrieving revision 1.3
diff -u -p -r1.3 i386-prologue.c
--- gdb.arch/i386-prologue.c	29 Apr 2004 18:05:31 -0000	1.3
+++ gdb.arch/i386-prologue.c	29 Jun 2004 08:04:34 -0000
@@ -1,3 +1,9 @@
+#ifdef SYMBOL_PREFIX
+#define SYMBOL(str)	SYMBOL_PREFIX #str
+#else
+#define SYMBOL(str)	#str
+#endif
+
 void gdb1253 (void);
 void gdb1338 (void);
 void jump_at_beginning (void);
@@ -15,7 +21,7 @@ main (void)
 
 asm(".text\n"
     "    .align 8\n"
-    "gdb1253:\n"
+    SYMBOL (gdb1253) ":\n"
     "    pushl %ebp\n"
     "    xorl  %ecx, %ecx\n"
     "    movl  %esp, %ebp\n"
@@ -28,7 +34,7 @@ asm(".text\n"
 
 asm(".text\n"
     "    .align 8\n"
-    "gdb1338:\n"
+    SYMBOL (gdb1338) ":\n"
     "    pushl %edi\n"
     "    pushl %esi\n"
     "    pushl %ebx\n"
@@ -44,7 +50,7 @@ asm(".text\n"
 
 asm(".text\n"
     "    .align 8\n"
-    "jump_at_beginning:\n"
+    SYMBOL (jump_at_beginning) ":\n"
     "    pushl %ebp\n"
     "    movl  %esp,%ebp\n"
     "    jmp   .gdbjump\n"
Index: gdb.arch/i386-prologue.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.arch/i386-prologue.exp,v
retrieving revision 1.4
diff -u -p -r1.4 i386-prologue.exp
--- gdb.arch/i386-prologue.exp	29 Apr 2004 18:05:31 -0000	1.4
+++ gdb.arch/i386-prologue.exp	29 Jun 2004 08:04:34 -0000
@@ -36,7 +36,15 @@ if ![istarget "i?86-*-*"] then {
 set testfile "i386-prologue"
 set srcfile ${testfile}.c
 set binfile ${objdir}/${subdir}/${testfile}
-if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
+
+# some targets have leading underscores on assembly symbols.
+# TODO: detect this automatically
+set additional_flags ""
+if [istarget "i?86-*-cygwin*"] then {
+  set additional_flags "additional_flags=-DSYMBOL_PREFIX=\"_\""
+}   
+
+if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug $additional_flags]] != "" } {
     gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
 }
 

-- 
Corinna Vinschen
Cygwin Co-Project Leader
Red Hat, Inc.