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Estimated hours taken: 0.25 README.FreeBSD: Mention that you need to configure with `--disable-extern-debug'.
69 lines
2.7 KiB
Plaintext
69 lines
2.7 KiB
Plaintext
We've had a report from Marko Schuetz <marko@ki.informatik.uni-frankfurt.de>
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that on FreeBSD you need to pass the `--disable-extern-debug' to configure:
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> From: Marko Schuetz <marko@ki.informatik.uni-frankfurt.de>
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> Date: 13 Oct 1999
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...
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> I grabbed mercury-compiler-1999-10-12. It compiles and
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> installs when configured with --disable-extern-debug.
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> Without --disable-extern-debug the compile fails in
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> trace/mercury_trace_external.c in the include files
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> <arpa/inet.h> and <netdb.h> (??!?!?)
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For FreeBSD, the Boehm conservative garbage collector does not yet support
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shared libraries. So Mercury does not yet support shared libraries on FreeBSD,
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except in the (not very useful) case where you compile with GC disabled,
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e.g. using the option `--gc none'.
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The rest of this file contains some hints for eager FreeBSD hackers
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about what would need to be done to make the Boehm collector support
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shared libraries on FreeBSD.
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--------------------
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The basic problem is that on FreeBSD the conservative collector does not
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scan the memory regions that contain global variables from dynamically linked
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shared object files.
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First, check the `recent_changes' file at
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<http://reality.sgi.com/boehm/gc_source/> to see if someone else
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has already solved the problem.
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In order to support dynamic linking, I think you need to implement the
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GC_register_dynamic_libraries() function in boehm_gc/dyn_load.c.
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This function needs to call
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GC_add_root(low_address, high_plus_one_address, TRUE)
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for every memory region in dynamically loaded code that needs to be
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scanned by the collector, so that the collector can scan global
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variables defined in shared libraries.
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If FreeBSD uses ELF and supports ELF in exactly the same way that Linux
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does, then you could try the following patch, which just enables the Linux
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code in the FreeBSD case. But most likely there are some differences
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between FreeBSD and Linux in this respect, so this will probably not work
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as is -- you should consider this just a starting point.
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Read the comments at the top of dyn_load.c for more details.
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--- dyn_load.c Mon Aug 31 15:05:05 1998
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+++ dyn_load.c.new Wed Jun 16 22:58:48 1999
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@@ -260,7 +260,7 @@
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# endif /* !USE_PROC ... */
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# endif /* SUNOS */
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-#if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF)
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+#if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || defined(FREEBSD)
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/* Dynamic loading code for Linux running ELF. Somewhat tested on
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* Linux/x86, untested but hopefully should work on Linux/Alpha.
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--- config.h Wed Oct 28 10:16:49 1998
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+++ config.h.new Wed Jun 16 23:08:56 1999
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@@ -699,6 +699,7 @@
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# ifdef FREEBSD
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# define OS_TYPE "FREEBSD"
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# define MPROTECT_VDB
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+# define DYNAMIC_LOADING
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# endif
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# ifdef NETBSD
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# define OS_TYPE "NETBSD"
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