with – • --no-allow-shlib-undefined (on the exe) • Operates recursively on ld, not on gold/lld. • -z defs (on the shlib) • --no-undefined (on the shlib) 19 bar foo exe lib1 lib2 lib3 lib4 Mach-O and PE/COFF have many problems but this may be a place where they got right.” Fangrui Song, LLD maintainer https://maskray.me/blog/2021-06-13-dependency-related-linker-options 21Position Independent x86-64 instructions is not covered by the Standard? Of course not. It just means that that’s a low-level concern (relative to the semantics of C++), and it's up to the platform to make a conforming C++

158 wr) ==131579== LLd misses: 3,336,167 ( 2,266,653 rd + 1,069,514 wr) ==131579== D1 miss rate: 7.9% ( 9.6% + 0.7% ) ==131579== LLd miss rate: 158 wr) ==131579== LLd misses: 3,336,167 ( 2,266,653 rd + 1,069,514 wr) ==131579== D1 miss rate: 7.9% ( 9.6% + 0.7% ) ==131579== LLd miss rate: ==131579== LLd misses: 3,336,167 ( 2,266,653 rd + 1,069,514 wr) 12 ==131579== D1 miss rate: 7.9% ( 9.6% + 0.7% ) 13 ==131579== LLd miss rate:

Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1102 48.4 Low-level synchronization using schedule and wait . . . . . . . . . . . . . . . . . . 1108 49 Multi-Threading ccall using a libuv threadpool (Experimental) . . . . . . . . . . . . . . . . . . . . . 1127 49.3 Low-level synchronization primitives . . . . . . . . . . . . . . . . . . . . . . . . . . 1127 50 Scoped Values Standard functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1442 79.6 Low-level matrix operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1553 79.7 BLAS functions

Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1102 48.4 Low-level synchronization using schedule and wait . . . . . . . . . . . . . . . . . . 1108 49 Multi-Threading ccall using a libuv threadpool (Experimental) . . . . . . . . . . . . . . . . . . . . . 1127 49.3 Low-level synchronization primitives . . . . . . . . . . . . . . . . . . . . . . . . . . 1127 50 Scoped Values Standard functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1442 79.6 Low-level matrix operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1553 79.7 BLAS functions

Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1102 48.4 Low-level synchronization using schedule and wait . . . . . . . . . . . . . . . . . . 1108 49 Multi-Threading ccall using a libuv threadpool (Experimental) . . . . . . . . . . . . . . . . . . . . . 1127 49.3 Low-level synchronization primitives . . . . . . . . . . . . . . . . . . . . . . . . . . 1127 50 Scoped Values Standard functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1442 79.6 Low-level matrix operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1553 79.7 BLAS functions

Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1145 49.4 Low-level synchronization using schedule and wait . . . . . . . . . . . . . . . . . . 1152 50 Multi-Threading ccall using a libuv threadpool (Experimental) . . . . . . . . . . . . . . . . . . . . . 1174 50.3 Low-level synchronization primitives . . . . . . . . . . . . . . . . . . . . . . . . . . 1174 50.4 Task metrics Standard functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1503 81.6 Low-level matrix operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1614 81.7 BLAS functions

Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1143 49.4 Low-level synchronization using schedule and wait . . . . . . . . . . . . . . . . . . 1150 50 Multi-Threading ccall using a libuv threadpool (Experimental) . . . . . . . . . . . . . . . . . . . . . 1172 50.3 Low-level synchronization primitives . . . . . . . . . . . . . . . . . . . . . . . . . . 1172 50.4 Task metrics Standard functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1501 81.6 Low-level matrix operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1613 81.7 BLAS functions

Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1142 49.4 Low-level synchronization using schedule and wait . . . . . . . . . . . . . . . . . . 1149 50 Multi-Threading ccall using a libuv threadpool (Experimental) . . . . . . . . . . . . . . . . . . . . . 1171 50.3 Low-level synchronization primitives . . . . . . . . . . . . . . . . . . . . . . . . . . 1171 50.4 Task metrics Standard functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1500 81.6 Low-level matrix operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1612 81.7 BLAS functions

Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1142 49.4 Low-level synchronization using schedule and wait . . . . . . . . . . . . . . . . . . 1149 50 Multi-Threading ccall using a libuv threadpool (Experimental) . . . . . . . . . . . . . . . . . . . . . 1171 50.3 Low-level synchronization primitives . . . . . . . . . . . . . . . . . . . . . . . . . . 1171 50.4 Task metrics Standard functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1500 81.6 Low-level matrix operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1612 81.7 BLAS functions

Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1134 48.4 Low-level synchronization using schedule and wait . . . . . . . . . . . . . . . . . . 1141 49 Multi-Threading ccall using a libuv threadpool (Experimental) . . . . . . . . . . . . . . . . . . . . . 1163 49.3 Low-level synchronization primitives . . . . . . . . . . . . . . . . . . . . . . . . . . 1163 49.4 Task metrics Standard functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1492 80.6 Low-level matrix operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1603 80.7 BLAS functions