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Describe mingw-w64 workaround

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The latest automated mingw-w64 build's libstdc++-6.dll crashes with
qpdf 4.1.0, but libstdc++-6.dll can be replaced with one from a newer
build.
This commit is contained in:
Jay Berkenbilt 2013-03-16 21:58:01 -04:00
parent 49c7681c58
commit 238996667c
1 changed files with 13 additions and 0 deletions
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README-windows.txt
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@ -33,6 +33,19 @@ mingw-w64-bin_i686-mingw_yyyymmdd.zip. The compiler binaries are
C:\MinGW-w64, and add C:\MinGW-w64\bin and C:\MinGW-w64\lib\mingw to
the path.
Starting in version 4.1.0, qpdf uses std::setprecision and std::fixed
to format floating point numbers, and using one or both of those
causes a crash with the version of libstdc++-6 that is included with
mingw-w64-bin_i686-mingw_20111220.zip, which appears to be the latest
mingw-hosted version of mingw that targets w64 that includes the full
toolchain including all the DLL creation tools. To work around this,
for my personal build, I have grabbed
x86_64-w64-mingw32-gcc-4.7.2-release-win64_rubenvb.7z from the
personal builds and just extracted libstdc++-6.dll from there and used
that to replace the one in the 20111220 version, which is based on
4.7.0. That particular workaround results in a Windows-hosted 64-bit
targetted mingw that can build a qpdf that passes its test suite.
As of this writing, the image comparison tests confuse ghostscript in
cygwin, but there's a chance they might work at some point. If you
want to run them, you need ghostscript and tiff utils as well, and you