----- Bob Friesenhahn <[email protected]> wrote:
> On Fri, 15 May 2015, Matthias Schmitt wrote:
> Using a different libpng than the system natively provides can be a
> bit of work.
The simplest workaround that I've found is to build my own libpng
with a prefix, so it can coexist with a system libpng. For example,
I have libpng12 as the "system" library that was installed by Ubuntu,
but want to use libpng16 (compiled withASAN) in an ASAN build of
GraphicsMagick.
So I configure libpng with
CC=gcc \
CPPFLAGS="-I/home/asan/bin/include" \
CFLAGS="-g -fsanitize=address -fno-omit-frame-pointer" \
LDFLAGS="-fsanitize=address -L/home/glennrp/asan/lib \
-Wl,-rpath,/home/glennrp/asan/lib" \
./configure --prefix=/home/glennrp/asan \
--with-libpng-prefix=LIBPNG_ASAN_ \
and GraphicsMagick with
CC=gcc \
CFLAGS="-g -I/home/glennrp/asan/include \
-fsanitize=address -fno-omit-frame-pointer" \
CPPFLAGS="-I/home/glennrp/asan/include" \
LDFLAGS="-fsanitize=address -L/home/glennrp/asan/lib \
-Wl,-rpath,/home/glennrp/asan/lib"
This way, freetype looks for functions named "png_set_something"
and finds them in the system libpng12, while GraphicsMagick looks
for things like "LIBPNG_ASAN_png_set_something" and finds them in
my asan/lib/libpng16.
Glenn
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