autoconf: Restore _GNU_SOURCE for all Linux systems
This catches the linux-uclibc case and any others that were being set
prior to 98fcdf3f
. Fixes bug 20345.
Signed-off-by: Dan Nicholson <dbn.lists@gmail.com>
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@ -87,7 +87,7 @@ dnl Compiler macros
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DEFINES=""
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AC_SUBST([DEFINES])
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case "$host_os" in
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*-gnu*)
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linux*|*-gnu*)
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DEFINES="$DEFINES -D_GNU_SOURCE -DPTHREADS"
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;;
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solaris*)
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