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53 lines
1.4 KiB
53 lines
1.4 KiB
RUN: lld-link -lldmingw %S/Inputs/gnu-weak.o %S/Inputs/gnu-weak2.o -out:%t.exe
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GNU ld can handle several definitions of the same weak symbol, and
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unless there is a strong definition of it, it just picks the first
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weak definition encountered.
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For each of the weak definitions, GNU tools produce a regular symbol
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named .weak.<weaksymbol>.<othersymbol>, where the other symbol name is
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another symbol defined close by.
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This can't be reproduced by assembling with llvm-mc, as llvm-mc always
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produces similar regular symbols named .weak.<weaksymbol>.default.
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The bundled object files can be produced from test code that looks like
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this:
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$ cat gnu-weak.c
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void weakfunc(void) __attribute__((weak));
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void otherfunc(void);
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__attribute__((weak)) void weakfunc() {
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}
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int main(int argc, char* argv[]) {
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otherfunc();
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weakfunc();
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return 0;
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}
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void mainCRTStartup(void) {
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main(0, (char**)0);
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}
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void __main(void) {
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}
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$ cat gnu-weak2.c
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void weakfunc(void) __attribute__((weak));
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__attribute__((weak)) void weakfunc() {
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}
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void otherfunc(void) {
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}
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$ x86_64-w64-mingw32-gcc -c -O2 gnu-weak.c
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$ x86_64-w64-mingw32-gcc -c -O2 gnu-weak2.c
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$ x86_64-w64-mingw32-nm gnu-weak.o | grep weakfunc
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0000000000000000 T .weak.weakfunc.main
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w weakfunc
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$ x86_64-w64-mingw32-nm gnu-weak2.o | grep weakfunc
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0000000000000000 T .weak.weakfunc.otherfunc
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w weakfunc
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