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make check//unix/-fPIE/-pie RUNTESTFLAGS=solib-display.exp
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gcc -fpic -c  -fPIE -pie -o x.o x.c
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/usr/lib/gcc/x86_64-redhat-linux/4.6.1/../../../../lib64/Scrt1.o: In function `_start':
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(.text+0x20): undefined reference to `main'
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=> Change the order for overrides.
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One has to also use -fPIC rather than -fPIE, -fPIC is stronger.
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The correct way would be:
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make check//unix RUNTESTFLAGS='CC_FOR_TARGET=gcc\ -fPIC\ -pie CXX_FOR_TARGET=g++\ -fPIC\ -pie solib-display.exp'
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But there is a problem with testsuite.unix non-unique subdir name and also
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a problem with make -j parallelization of the testsuite.
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--- gdb-7.3.50.20110722/gdb/testsuite/lib/future.exp	2011-10-11 16:44:05.000000000 +0200
e6cdbfd
+++ gdb-7.3.50.20110722/gdb/testsuite/lib/future.exp	2011-10-11 16:44:10.000000000 +0200
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@@ -77,6 +77,10 @@ proc gdb_default_target_compile {source
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     set ldflags ""
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     set dest [target_info name]
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+    if {[board_info $dest exists multilib_flags]} {
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+	append add_flags " [board_info $dest multilib_flags]"
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+    }
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+
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     if {[info exists CFLAGS_FOR_TARGET]} {
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 	append add_flags " $CFLAGS_FOR_TARGET"
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     }
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@@ -333,10 +337,6 @@ proc gdb_default_target_compile {source
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 	}
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     }
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-    if {[board_info $dest exists multilib_flags]} {
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-	append add_flags " [board_info $dest multilib_flags]"
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-    }
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-
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     verbose "doing compile"
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     set sources ""