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