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| author | Daniel Colascione <dancol@dancol.org> | 2012-12-11 19:26:52 -0800 |
|---|---|---|
| committer | Daniel Colascione <dancol@dancol.org> | 2012-12-11 19:26:52 -0800 |
| commit | cc98b6842663b6fe30e0b7c7a628604959d5dc69 (patch) | |
| tree | 8fae8652e7ab59422f3b8c782e654f8679c6bc38 /src/unexcw.c | |
| parent | 69e1c203e96afb6e95fdda422d00c07b0bcbf76c (diff) | |
| download | emacs-cc98b6842663b6fe30e0b7c7a628604959d5dc69.tar.gz | |
2012-12-12 Daniel Colascione <dancol@dancol.org>
* unexcw.c (fixup_executable): use posix_fallocate to ensure that
the dumped Emacs is not a sparse file, greatly improving Cygwin
"make bootstrap" performance.
Diffstat (limited to 'src/unexcw.c')
| -rw-r--r-- | src/unexcw.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/unexcw.c b/src/unexcw.c index 8c5d574530d..7d1a72e0009 100644 --- a/src/unexcw.c +++ b/src/unexcw.c @@ -183,6 +183,19 @@ fixup_executable (int fd) exe_header->file_optional_header.FileAlignment * exe_header->file_optional_header.FileAlignment; + /* Make sure the generated bootstrap binary isn't + * sparse. NT doesn't use a file cache for sparse + * executables, so if we bootstrap Emacs using a sparse + * bootstrap-emacs.exe, bootstrap takes about twenty + * times longer than it would otherwise. */ + + ret = posix_fallocate (fd, + ( exe_header->section_header[i].s_scnptr + + exe_header->section_header[i].s_size ), + 1); + + assert (ret != -1); + ret = lseek (fd, (long) (exe_header->section_header[i].s_scnptr + |