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WASM add a note about memory required for linking

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Signed-off-by: Michael Stahl <michael.stahl@allotropia.de>
Change-Id: Ic7f2cffdeb4408a9f726ad70a8ceb8db372787d9
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Michael Stahl 2022-11-23 10:43:20 +01:00 committed by Tor Lillqvist
parent 9f8c4f6741
commit a4b31d4966
1 changed files with 6 additions and 0 deletions
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wasm/README
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@ -8,6 +8,12 @@ Note that there are wrapper tools like "emconfigure", "emmake", "emcmake" that
tend to set up environment variables like CC properly, although some project's
build system unfortunately override that.
Linking WASM executable uses a lot of memory; without optimisations or with -O1
in LDFLAGS, /usr/bin/time prints "1660068maxresident" which should work
anywhere, but with -O2 in LDFLAGS (which is the default) some LTO happens that
uses about 8x as much RAM, "12261016maxresident" or ~12 GiB... so append
CXXFLAGS='-g -O1' or similar to the configure invocation if out of memory.
For convenience it's recommended to build with a docker container that has the
required build tools.