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gcc: optimize cross-compiled libraries

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`libstdc++` and a few other libraries are comiled with the options
set in `EXTRA_TARGET_FLAGS`. Normally, this is filled form
`EXTRA_FLAGS` inside of `builder.sh`, from which it inherits its
optimization option. For cross compilers `EXTRA_TARGET_FLAGS` is
set by a dedicated function that does not specify any optimization,
leading to sub-par runtime performance of many C++ programs.
This commit is contained in:
Tobias Mayer 2020-05-27 00:11:11 +02:00
parent 72066757c8
commit 2be2b5328c
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GPG Key ID: F8657E90819A1298
1 changed files with 4 additions and 1 deletions
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5
pkgs/development/compilers/gcc/common/extra-target-flags.nix
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@ -5,9 +5,12 @@ let
in
{
# For non-cross builds these flags are currently assigned in builder.sh.
# It would be good to consolidate the generation of makeFlags
# ({C,CXX,LD}FLAGS_FOR_{BUILD,TARGET}, etc...) at some point.
EXTRA_TARGET_FLAGS = let
mkFlags = dep: langD: lib.optionals (targetPlatform != hostPlatform && dep != null && !langD) ([
"-idirafter ${lib.getDev dep}${dep.incdir or "/include"}"
"-O2 -idirafter ${lib.getDev dep}${dep.incdir or "/include"}"
] ++ stdenv.lib.optionals (! crossStageStatic) [
"-B${lib.getLib dep}${dep.libdir or "/lib"}"
]);