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The thing that was baffling me was that a nearly identical piece of code was generated correctly in the same file. I fianlly tracked it down to the multiple different ways glibc declares weak references:
/* used by __pthread_initialize in glibc - works fine */ extern void __weak_one(void) __attribute__ ((weak));
/* works with gcc-3.4.1 IF used... */ extern void __weak_two (void); #pragma weak __weak_two
/* used by __pthread_mutex_init in glibc (for mips at least) BAD in gcc-3.4.1 ! */ extern void __weak_three (void); asm(".weak " "__weak_three");
I'm assuming the problem is a 'trivial' dead code removal optimization - since gcc doesn't know anything about the contect of the "asm()" statement, if assumes that the "__weak_three" symbol is non-zero, and optimized out a check like "if (__weak_three != NULL)"
I noticed that glibc-2.3.2 has a more complicated system for declaring weak references - I will test this with it when I get the chance...
Will also put together a patch for glibc-2.2.5 to use #pragma instead of asm() (since I've been using 2.2.5 previously, and am not sure I want to upgrade yet...)
If you find a fix for glibc-2.2.5, I'd be happy to include it (especially if it's a simple backport from glibc-2.3.2...) - Dan
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