[m-dev.] for review: work-around for lcc bug

[Fergus Henderson]

On 10-Jan-2001, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> This looks a bit like a bug in this version of lcc and/or glibc, since
> libc.a includes references to libgcc.a, but lcc isn't linking in libgcc.a.

I've confirmed that this is indeed a bug in this version of lcc:
`lcc -static' reports the same spurious link error even for the
following strictly conforming ANSI/ISO C program:

	#include <stdlib.h>
	double pi() {
		return strtod("3.14", NULL);
	}
	int main() {
		return 0;
	}

I've posted a bug report to comp.compilers.lcc (which is apparently
the official channel for such things).

Here's a proposed work-around.  Does this look OK?

----------

Estimated hours taken: 1

Link with the shared version of the C standard library,
rather than linking the C library in statically.
This works around an lcc bug with static linking.

compiler/Mmakefile:
profiler/Mmakefile:
	Add `--shared' to `MLFLAGS'.
	The overrides the default `--static' on Linux.
	(Since we name all the Mercury libraries that we link with
	explicitly, this only affects the way we link with the C
	library, not with the Mercury runtime or standard library.)

Workspace: /home/pgrad/fjh/fs/roy2/mercury
Index: compiler/Mmakefile
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/Mmakefile,v
retrieving revision 1.35
diff -u -d -r1.35 Mmakefile
--- compiler/Mmakefile	2000/12/11 05:38:45	1.35
+++ compiler/Mmakefile	2001/01/11 09:07:53
@@ -42,7 +42,7 @@
 		MERCURY_TRACE_LIB_MODS="$(BROWSER_DIR)/$(BROWSER_LIB_NAME).init" \
 		MERCURY_MKINIT=$(UTIL_DIR)/mkinit $(SCRIPTS_DIR)/c2init
 ML	=	MERCURY_C_LIB_DIR=. $(SCRIPTS_DIR)/ml
-MLFLAGS =	--mercury-libs none
+MLFLAGS =	--shared --mercury-libs none
 MLLIBS  =	$(TRACE_DIR)/lib$(TRACE_LIB_NAME).$A \
 		$(BROWSER_DIR)/lib$(BROWSER_LIB_NAME).$A \
 		$(LIBRARY_DIR)/lib$(STD_LIB_NAME).$A \
Index: profiler/Mmakefile
===================================================================
RCS file: /home/mercury1/repository/mercury/profiler/Mmakefile,v
retrieving revision 1.18
diff -u -d -r1.18 Mmakefile
--- profiler/Mmakefile	2000/10/31 07:54:04	1.18
+++ profiler/Mmakefile	2001/01/11 09:10:23
@@ -40,7 +40,7 @@
 		MERCURY_TRACE_LIB_MODS="$(BROWSER_DIR)/$(BROWSER_LIB_NAME).init" \
                 MERCURY_MKINIT=$(UTIL_DIR)/mkinit $(SCRIPTS_DIR)/c2init
 ML	=	MERCURY_C_LIB_DIR=. $(SCRIPTS_DIR)/ml
-MLFLAGS =	--mercury-libs none
+MLFLAGS =	--shared --mercury-libs none
 MLLIBS  =	$(TRACE_DIR)/lib$(TRACE_LIB_NAME).$A \
 		$(BROWSER_DIR)/lib$(BROWSER_LIB_NAME).$A \
 		$(LIBRARY_DIR)/lib$(STD_LIB_NAME).$A \
-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
                                    |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.
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