On 29/05/2007, at 4:36 PM, Peter O'Gorman wrote:
Adding '-fnested-functions' to the CFLAGS stops the compiler
barfing. However as per Apple Tech note http://
developer.apple.com/technotes/tn2006/tn2161.html it is also
necessary to add -fnested-functions or an equivalent ld flag to
the compiler link command. Without this flag, the linker defaults
to disable_stack_execute on i386 and the library crashes at runtime.
Adding -fnested-functions to libfoo_la_LDFLAGS does not work
because libtool strips it out before invoking gcc.
Is there a way around this or an actual fix?
LDFLAGS=-Wl,-allow_stack_execute does not work?
I just sent the message below to the Apple xcode-users list:
TN2161 says that -fnested-functions can be passed to the compiler
driver in a link command to send the "-allow_stack_execute" flag to
the linker.
However, libtool seems to choke on it thus:
gcc -B ../../tools -dynamiclib -fnested-functions -o .libs/
libswarm.0.0.0.dylib .libs/SwarmEnvironment.o .libs/
classList.o .libs/libswarm.lax/libspace.a/Ca2d.o
*** lots of objects removed ****
.libs/libswarm.lax/libswarmobjc.a/thr.o -L/Library/Frameworks/
Swarm.framework/Versions/Current/Resources/lib -L/Library/
Frameworks/Tk.framework/Versions/8.4-X11/lib -L/usr/X11R6/lib -
lpthread /Library/Frameworks/Swarm.framework/Versions/Current/
Resources/lib/libffi.dylib -lBLT24 -lXpm /Library/Frameworks/
Swarm.framework/Versions/Current/Resources/lib/libpng12.dylib /
Library/Frameworks/Swarm.framework/Versions/Current/Resources/lib/
libhdf5.dylib -lz -lX11 -lm -ldl -Wl,-search_paths_first -
framework CoreFoundation -framework CoreFoundation -framework Tk -
framework Tcl -install_name /Library/Frameworks/Swarm.framework/
Versions/2.2/lib/libswarm.0.dylib -Wl,-compatibility_version -Wl,1 -
Wl,-current_version -Wl,1.0
/usr/bin/libtool: unknown option character `l' in: -
allow_stack_execute
Usage: /usr/bin/libtool -static [-] file [...] [-filelist listfile
[,dirname]] [-arch_only arch] [-sacLT]
Usage: /usr/bin/libtool -dynamic [-] file [...] [-filelist listfile
[,dirname]] [-arch_only arch] [-o output] [-install_name name] [-
compatibility_version #] [-current_version #] [-seg1addr 0x#] [-
segs_read_only_addr 0x#] [-segs_read_write_addr 0x#] [-
seg_addr_table <filename>] [-seg_addr_table_filename
<file_system_path>] [-all_load] [-noall_load]
make[4]: *** [libswarm.la] Error 1
Ho hum
This was done bodging -fnested-functions option into the configured
libtool script.
I will try the -Wl option but libtool seems to strip all flags that
it does not recognise.
Have to dash now
Bill
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