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static runtime

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git-svn-id: svn+q:///qpdf/trunk@790 71b93d88-0707-0410-a8cf-f5a4172ac649
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Jay Berkenbilt 2009-10-11 13:24:08 +00:00
parent 35cf9ebabe
commit d6b5e4efe3
1 changed files with 18 additions and 9 deletions
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README.windows
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@ -35,10 +35,8 @@ directory. You can find the path to it by running
type -P libgcc_s_dw2-1.dll
replacing libgcc_s_dw2-1.dll with whatever gcc DLL is shown, if
different. For an unknown reason, building with -static-libgcc
results in executables that fail their test suites. I'm guessing this
has to do with static data being duplicated between the DLL and the
executable, but I don't really know.
different. Redistribution of this DLL is unavoidable as of this
writing; see "Static Runtime" below for details.
From your cygwin prompt, add the absolute path to the libqpdf/build
directory to your PATH. Make sure you can run the qpdf command by
@ -93,8 +91,19 @@ within visual C++, and then click Retry in qpdf.
A release version of qpdf is built by default. You will probably have
to edit msvc.mk to change /MD to /MDd to build a debugging version.
It has also been attempted to build qpdf with /MT, but it does not
pass its test suite in this configuration. I have not investigated.
Perhaps this is the same issue as with -static-libgcc with mingw. In
both cases, statically linking the runtime results in non-working
executables/DLL.
Note that you must redistribute the Microsoft runtime DLLs. Linking
with static runtime won't work; see "Static Runtime" below for
details.
Static Runtime
==============
Building the DLL and executables with static runtime does not work
with either Visual C++ .NET 2008 (a.k.a. vc9) using /MT or with mingw
(at least as of 4.4.0) using -static-libgcc. The reason is that, in
both cases, there is static data involved with exception handling, and
when the runtime is linked in statically, exceptions cannot be thrown
across the DLL to EXE boundary. Since qpdf uses exception handling
extensively for error handling, we have no choice but to redistribute
the C++ runtime DLLs. Maybe this will be addressed in a future
version of the compilers.