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emacs: enable second-stage "compilation" (i.e. dumping) via qemu

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cuts startup time of emacs down to a few seconds
This commit is contained in:
David Kühling
2011-06-26 10:46:33 +02:00
parent 1d560afdcb
commit ed5db4233c
2 changed files with 64 additions and 15 deletions
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15
emacs/patches/030-workaround-qemu-ftruncate.patch Normal file
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@@ -0,0 +1,15 @@
Index: emacs-23.2/src/unexelf.c
===================================================================
--- emacs-23.2.orig/src/unexelf.c 2011-06-26 09:58:31.000000000 +0200
+++ emacs-23.2/src/unexelf.c 2011-06-26 10:00:40.000000000 +0200
@@ -827,7 +827,9 @@
new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_incr;
- if (ftruncate (new_file, new_file_size))
+ /* this gives an error code when run via Qemu userspace emulation,
+ just ignoring the result code seems to fix the problem. */
+ if (ftruncate (new_file, new_file_size) && 0)
fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
new_base = mmap (NULL, new_file_size, PROT_READ | PROT_WRITE,