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INSTALL.md: suggest -Wl,-dead_strip for Apple targets

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For reducing binary size. Also to remove (or greatly mitigate)
the side-effect of using "unity" builds. Similar to `-Wl,--gc-sections`
on non-Apple platforms.

For example with curl-for-win builds, macOS arm+intel:

curl (unity):                      7.7MB -> 6.8MB
libcurl.dylib (unity):             7.2MB -> 6.4MB
trurl /w static libcurl (!unity):  535KB -> 251KB (same size with unity)

Ref: c4008d658a

Closes #20346
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Viktor Szakats 2026-01-18 18:06:33 +01:00
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@ -563,7 +563,7 @@ may be relevant in some environments: `-march=X`, `-mthumb`, `-m32`,
`-mdynamic-no-pic`, `-flto`, `-fdata-sections`, `-ffunction-sections`,
`-fno-unwind-tables`, `-fno-asynchronous-unwind-tables`,
`-fno-record-gcc-switches`, `-fsection-anchors`, `-fno-plt`,
`-Wl,--gc-sections`, `-Wl,-Bsymbolic`, `-Wl,-s`,
`-Wl,--gc-sections`, `-Wl,-dead_strip` (Apple), `-Wl,-Bsymbolic`, `-Wl,-s`
For example, this is how to combine a few of these options: