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<title>GNU Compiler Collection (GCC) Internals: Filesystem</title>
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<a name="Filesystem"></a>
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<p>
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Next: <a href="Host-Misc.html#Host-Misc" accesskey="n" rel="next">Host Misc</a>, Previous: <a href="Host-Common.html#Host-Common" accesskey="p" rel="prev">Host Common</a>, Up: <a href="Host-Config.html#Host-Config" accesskey="u" rel="up">Host Config</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Host-Filesystem"></a>
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<h3 class="section">18.2 Host Filesystem</h3>
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<a name="index-configuration-file"></a>
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<a name="index-xm_002dmachine_002eh"></a>
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<p>GCC needs to know a number of things about the semantics of the host
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machine’s filesystem. Filesystems with Unix and MS-DOS semantics are
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automatically detected. For other systems, you can define the
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following macros in <samp>xm-<var>machine</var>.h</samp>.
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</p>
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<dl compact="compact">
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<dt><code>HAVE_DOS_BASED_FILE_SYSTEM</code>
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<a name="index-HAVE_005fDOS_005fBASED_005fFILE_005fSYSTEM"></a>
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</dt>
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<dd><p>This macro is automatically defined by <samp>system.h</samp> if the host
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file system obeys the semantics defined by MS-DOS instead of Unix.
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DOS file systems are case insensitive, file specifications may begin
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with a drive letter, and both forward slash and backslash (‘<samp>/</samp>’
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and ‘<samp>\</samp>’) are directory separators.
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</p>
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</dd>
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<dt><code>DIR_SEPARATOR</code>
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<a name="index-DIR_005fSEPARATOR"></a>
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</dt>
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<dt><code>DIR_SEPARATOR_2</code>
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<a name="index-DIR_005fSEPARATOR_005f2"></a>
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</dt>
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<dd><p>If defined, these macros expand to character constants specifying
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separators for directory names within a file specification.
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<samp>system.h</samp> will automatically give them appropriate values on
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Unix and MS-DOS file systems. If your file system is neither of
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these, define one or both appropriately in <samp>xm-<var>machine</var>.h</samp>.
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</p>
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<p>However, operating systems like VMS, where constructing a pathname is
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more complicated than just stringing together directory names
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separated by a special character, should not define either of these
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macros.
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</p>
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</dd>
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<dt><code>PATH_SEPARATOR</code>
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<a name="index-PATH_005fSEPARATOR"></a>
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</dt>
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<dd><p>If defined, this macro should expand to a character constant
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specifying the separator for elements of search paths. The default
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value is a colon (‘<samp>:</samp>’). DOS-based systems usually, but not
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always, use semicolon (‘<samp>;</samp>’).
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</p>
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</dd>
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<dt><code>VMS</code>
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<a name="index-VMS"></a>
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</dt>
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<dd><p>Define this macro if the host system is VMS.
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</p>
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</dd>
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<dt><code>HOST_OBJECT_SUFFIX</code>
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<a name="index-HOST_005fOBJECT_005fSUFFIX"></a>
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</dt>
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<dd><p>Define this macro to be a C string representing the suffix for object
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files on your host machine. If you do not define this macro, GCC will
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use ‘<samp>.o</samp>’ as the suffix for object files.
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</p>
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</dd>
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<dt><code>HOST_EXECUTABLE_SUFFIX</code>
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<a name="index-HOST_005fEXECUTABLE_005fSUFFIX"></a>
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</dt>
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<dd><p>Define this macro to be a C string representing the suffix for
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executable files on your host machine. If you do not define this macro,
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GCC will use the null string as the suffix for executable files.
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</p>
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</dd>
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<dt><code>HOST_BIT_BUCKET</code>
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<a name="index-HOST_005fBIT_005fBUCKET"></a>
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</dt>
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<dd><p>A pathname defined by the host operating system, which can be opened as
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a file and written to, but all the information written is discarded.
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This is commonly known as a <em>bit bucket</em> or <em>null device</em>. If
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you do not define this macro, GCC will use ‘<samp>/dev/null</samp>’ as the bit
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bucket. If the host does not support a bit bucket, define this macro to
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an invalid filename.
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</p>
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</dd>
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<dt><code>UPDATE_PATH_HOST_CANONICALIZE (<var>path</var>)</code>
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<a name="index-UPDATE_005fPATH_005fHOST_005fCANONICALIZE-_0028path_0029"></a>
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</dt>
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<dd><p>If defined, a C statement (sans semicolon) that performs host-dependent
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canonicalization when a path used in a compilation driver or
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preprocessor is canonicalized. <var>path</var> is a malloc-ed path to be
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canonicalized. If the C statement does canonicalize <var>path</var> into a
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different buffer, the old path should be freed and the new buffer should
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have been allocated with malloc.
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</p>
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</dd>
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<dt><code>DUMPFILE_FORMAT</code>
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<a name="index-DUMPFILE_005fFORMAT"></a>
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</dt>
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<dd><p>Define this macro to be a C string representing the format to use for
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constructing the index part of debugging dump file names. The resultant
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string must fit in fifteen bytes. The full filename will be the
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concatenation of: the prefix of the assembler file name, the string
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resulting from applying this format to an index number, and a string
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unique to each dump file kind, e.g. ‘<samp>rtl</samp>’.
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</p>
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<p>If you do not define this macro, GCC will use ‘<samp>.%02d.</samp>’. You should
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define this macro if using the default will create an invalid file name.
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</p>
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</dd>
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<dt><code>DELETE_IF_ORDINARY</code>
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<a name="index-DELETE_005fIF_005fORDINARY"></a>
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</dt>
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<dd><p>Define this macro to be a C statement (sans semicolon) that performs
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host-dependent removal of ordinary temp files in the compilation driver.
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</p>
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<p>If you do not define this macro, GCC will use the default version. You
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should define this macro if the default version does not reliably remove
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the temp file as, for example, on VMS which allows multiple versions
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of a file.
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</p>
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</dd>
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<dt><code>HOST_LACKS_INODE_NUMBERS</code>
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<a name="index-HOST_005fLACKS_005fINODE_005fNUMBERS"></a>
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</dt>
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<dd><p>Define this macro if the host filesystem does not report meaningful inode
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numbers in struct stat.
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</p></dd>
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</dl>
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<div class="header">
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<p>
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Next: <a href="Host-Misc.html#Host-Misc" accesskey="n" rel="next">Host Misc</a>, Previous: <a href="Host-Common.html#Host-Common" accesskey="p" rel="prev">Host Common</a>, Up: <a href="Host-Config.html#Host-Config" accesskey="u" rel="up">Host Config</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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