38 lines
1.4 KiB
Diff
38 lines
1.4 KiB
Diff
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Don't build object files twice
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When passed --enable-static and --enable-shared, icu will generate
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both a shared and a static version of its libraries.
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However, in order to do so, it builds each and every object file
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twice: once with -fPIC (for the shared library), and once without
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-fPIC (for the static library). While admittedly building -fPIC for a
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static library generates a slightly suboptimal code, this is what all
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the autotools-based project are doing. They build each object file
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once, and they use it for both the static and shared libraries.
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icu builds the object files for the shared library as .o files, and
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the object files for static library as .ao files. By simply changing
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the suffix of object files used for static libraries to ".o", we tell
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icu to use the ones built for the shared library (i.e, with -fPIC),
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and avoid the double build of icu.
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On a fast build server, this brings the target icu build from
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3m41.302s down to 1m43.926s (approximate numbers: some other builds
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are running on the system at the same time).
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Index: b/source/config/mh-linux
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===================================================================
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--- a/source/config/mh-linux
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+++ b/source/config/mh-linux
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@@ -35,7 +35,7 @@
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## Shared object suffix
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SO = so
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## Non-shared intermediate object suffix
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-STATIC_O = ao
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+STATIC_O = o
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## Compilation rules
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%.$(STATIC_O): $(srcdir)/%.c
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