On 07/21/2012 08:20 AM, Knut Petersen wrote: > Hi everybody! > > While debugging a xorg modules loading failure I found that the test > for -fPIC > support wrongly judges that the compiler does not support PIC code > generation > whenever CFLAGS contains "-v" or "--verbose", see xorg bug 41208. > <https://bugs.freedesktop.org/show_bug.cgi?id=41208> > > The reason is obvious - the autoconf "-fPIC" test assumes that any > additional > output during the test compilation is caused by a compiler warning, > but in > verbose mode that output it is caused by the compile process. > > The inclusion of "-v" into CFLAGS for an xorg build causes compilation > without -fPIC, hence no position independent code is generated, hence > lazy symbol resolution does not work, hence dlopen() calls used to > load xorg modules fail. > > btw: Some other standard tests share the same broken mechanism. > > I think this needs to be fixed as probably almost nobody knows or > suspects > that enabling verbose compiler output has the side effect of disabling > generation of position independent code. Maybe the easiest way would > be to strip "-v" and "--verbose" from CFLAGS for those tests. > > autoconf version used: 2.68 (this problems seems to be old, I found > related discussions dating back to at least 2007)
I have noticed the same or similar problem with Solaris Studio on Linux, see email "FYI: Solaris Studio compiler on Linux and PIC support in C++". -- VZ
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