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Add a note about a problem that can arise when bootstrapping a 64-bit

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Branches: main, 10.04

README.MacOS:
	Add a note about a problem that can arise when bootstrapping a 64-bit
	Mercury compiler using a 32-bit one and vice versa.
This commit is contained in:
Julien Fischer
2010-06-09 04:38:28 +00:00
parent 455f87ba38
commit ef02c69336
1 changed files with 15 additions and 0 deletions
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README.MacOS
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@@ -25,6 +25,21 @@ By default, 32-bit versions of the executables and libraries are installed on
Mac OS X 10.5. To build and install 64-bit Mercury on that system you must
pass the "-m64" option to gcc.
Note that if you are building Mercury from scratch using an existing installed
Mercury compiler, i.e. you are not installing using the pre-generated C files in
the source distribution, and you are using a 32-bit Mercury compiler to
bootstrap a 64-bit installation (or vice versa) then you must compile with
--cross-compiling enabled. Not enabling it will result in library installation
aborting with an error message like the following:
Uncaught Mercury exception:
Software Error: pred_table.m: Unexpected: can't locate compare/3
You can enable cross-compilation by putting the following line in a file named
Mmake.params at the top-level of the source tree:
MCFLAGS = --cross-compiling
Mercury can currently only be compiled by gcc on Mac OS X. It cannot currently
be compiled with llvm-gcc or clang.