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https://github.com/NixOS/nixpkgs.git
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da4fb573a7
were no longer in use. * A patch for compiling the ATerm library with GCC 4.3. Without it, the code for resizing ATerm tables gets stuck in an infinite loop (http://bugzilla.sen.cwi.nl:8080/show_bug.cgi?id=841). The problem is in this bit of code in hash.c, which tries to dynamically figure out the maximum signed integer: long try_long_max; long long_max; long delta; try_long_max = 1; do { long_max = try_long_max; try_long_max = long_max * 2; } while (try_long_max > 0); At -O2, GCC 4.3 determines that 1 * 2 * 2 * ... can never be <= 0, and so it optimises this into a 1-instruction infinite loop: 0x0805a782 <keyPut+1282>: jmp 0x805a782 <keyPut+1282> Quite beautiful really. ;-) The fix is to use the LONG_MAX macro instead. svn path=/nixpkgs/branches/stdenv-updates/; revision=13888
78 lines
1.7 KiB
Diff
78 lines
1.7 KiB
Diff
diff -rc aterm-2.8-orig/aterm/hash.c aterm-2.8/aterm/hash.c
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*** aterm-2.8-orig/aterm/hash.c 2008-11-10 13:54:22.000000000 +0100
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--- aterm-2.8/aterm/hash.c 2009-01-27 18:14:14.000000000 +0100
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***************
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*** 93,146 ****
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}
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/*}}} */
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- /*{{{ static long calc_long_max() */
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- static long calc_long_max()
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- {
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- long try_long_max;
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- long long_max;
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- long delta;
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-
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- try_long_max = 1;
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- do {
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- long_max = try_long_max;
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- try_long_max = long_max * 2;
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- } while (try_long_max > 0);
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-
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- delta = long_max;
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- while (delta > 1) {
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- while (long_max + delta < 0) {
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- delta /= 2;
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- }
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- long_max += delta;
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- }
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-
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- return long_max;
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-
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- }
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- /*}}} */
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/*{{{ static long calculateNewSize(sizeMinus1, nrdel, nrentries) */
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static long calculateNewSize
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(long sizeMinus1, long nr_deletions, long nr_entries)
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{
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-
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- /* Hack: LONG_MAX (limits.h) is often unreliable, we need to find
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- * out the maximum possible value of a signed long dynamically.
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- */
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- static long st_long_max = 0;
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-
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- /* the resulting length has the form 2^k-1 */
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-
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if (nr_deletions >= nr_entries/2) {
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return sizeMinus1;
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}
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! if (st_long_max == 0) {
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! st_long_max = calc_long_max();
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! }
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!
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! if (sizeMinus1 > st_long_max / 2) {
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! return st_long_max-1;
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}
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return (2*sizeMinus1)+1;
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--- 93,109 ----
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}
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/*}}} */
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/*{{{ static long calculateNewSize(sizeMinus1, nrdel, nrentries) */
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static long calculateNewSize
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(long sizeMinus1, long nr_deletions, long nr_entries)
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{
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if (nr_deletions >= nr_entries/2) {
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return sizeMinus1;
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}
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! if (sizeMinus1 > LONG_MAX / 2) {
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! return LONG_MAX-1;
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}
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return (2*sizeMinus1)+1;
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