thanks; got it going,
Franz.

Maybe the following Readme would help other (Ubuntu-)users:

# install this:
sudo apt-get install libtool
sudo apt-get install libjpeg-dev
sudo apt-get install libfltk1.3-dev
# copy files into home:
cd ~
gunzip Downloads/solvespace-fltk-port-.....tar.gz
tar -xvf Downloads/solvespace-fltk-port-.....tar
cd ~/solvespace-fltk-port
# build
./autogen.sh
./configure
make
# start
cd
./solvespace-fltk-port/src/solvespace

I don't think the GTK version of SolveSpace is ready for use. It may not even be in development anymore, seeing as the last commit was back in October.

Glad to see you were able to get the FLTK port built!

Hi,
have the same problem: segfault with extrude.
Here is the debug-session;
a and b in srf/boolean.cpp:875 are invalid;
cannot solve the problem (c++ is tooo tricky);
Franz


Program received signal SIGSEGV, Segmentation fault at:
875 double dea = ScaledSignedDistanceToLine(ea, a, b, srf),
#0 SBspUv::InsertEdge (this=0x7600000076b10000, ea=..., eb=...,
srf=srf@entry=0x2abea70) at srf/boolean.cpp:875
#1 0x000000000047f77e in SBspUv::InsertEdge (this=this@entry=0x2a87150,
ea=..., eb=..., srf=srf@entry=0x2abea70) at srf/boolean.cpp:900
#2 0x000000000047fcd5 in SBspUv::From (el=el@entry=0x7ffffffe62b0,
srf=srf@entry=0x2abea70) at srf/boolean.cpp:824
#3 0x000000000047fd78 in SSurface::MakeClassifyingBsp (
this=this@entry=0x2abea70, shell=shell@entry=0x7ffff0822760,
useCurvesFrom=useCurvesFrom@entry=0x0) at srf/boolean.cpp:789
#4 0x000000000047fe08 in SShell::MakeClassifyingBsps (
this=this@entry=0x7ffff0822760, useCurvesFrom=useCurvesFrom@entry=0x0)
at srf/boolean.cpp:780
#5 0x0000000000482b03 in SShell::MakeFromBoolean (this=0x7ffff0822788,
a=0x7ffff080d488, b=0x7ffff0822760, type=10) at srf/boolean.cpp:727
#6 0x0000000000455601 in GenerateForBoolean<SShell> (how=0,
outs=0x7ffff0822788, thiss=0x7ffff0822760, prevs=0x7ffff080d488,
this=<optimized out>) at groupmesh.cpp:174
#7 Group::GenerateShellAndMesh (this=0x7ffff0822610) at groupmesh.cpp:323
#8 0x00000000004499ac in SolveSpace::GenerateAll (this=0x77d4e0 <SS>,
first=2, last=2, andFindFree=false) at generate.cpp:266


------- srf/boolean.cpp:875 double dea = ScaledSignedDistanceToLine(ea, a, b, srf),
(gdb) p ea
$1 = {x = 0.85355339059327406, y = 0.14644660940602666}
(gdb) p a
Cannot access memory at address 0x7600000076b10000
(gdb) p b
Cannot access memory at address 0x7600000076b10010
(gdb) p srf
$2 = (SSurface *) 0x2abea70

------- srf/boolean.cpp:900 pos = pos->InsertEdge(ea, eb, srf);
(gdb) p ea
$3 = {x = 0.85355339059327406, y = 0.14644660940602666}
(gdb) p eb
$4 = {x = 0.68404735478093626, y = 0.035105849468616959}
(gdb) p srf
$5 = (SSurface *) 0x2abea70

Hi,

I tried to compile install the fltk-port branch under Debian an got some errors.

First I could not build with my version of autotools, I had t modify the configure.ac file to include the subdir-objects option.

Second I had segmentation faults in the 2d binary space partitioning code while creating the mesh for rendering solid. this is certainly the same error that Juan-Carlos FUREST and Franz Reiter had when extruding.

Basically it is due te the use of uninitialized variables (SBspUv.pos, SBspUv.neg and SBspUv.more in this case) but after correcting it i get other similar errors. All errors are due to code using uninitialized pointer assuming they are NULL. So to avoid hours of debugging a lots of small corrections all over the place, I just modified the Linux heap allocator code to set memory to 0 when allocating it. This is not the most clean and optimum way to fix the bug in my opinion but it is the easiest.

The patch follows, please be free to include it upstream.


diff --git a/configure.ac b/configure.ac
index 0813f79..ccfdca3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,7 +7,7 @@ AC_CONFIG_SRCDIR([src/solvespace.cpp])
AC_CONFIG_AUX_DIR([ac-aux])
AC_CONFIG_MACRO_DIR([ac-aux])

-AM_INIT_AUTOMAKE([1.9.6 foreign tar-ustar])
+AM_INIT_AUTOMAKE([1.9.6 foreign tar-ustar subdir-objects])
AM_MAINTAINER_MODE

AC_PROG_CC
diff --git a/src/fltk/fltkutil.cpp b/src/fltk/fltkutil.cpp
index b35a251..337c37b 100644
--- a/src/fltk/fltkutil.cpp
+++ b/src/fltk/fltkutil.cpp
@@ -55,8 +55,13 @@ static AllocTempHeader *Head = NULL;

void *AllocTemporary(size_t n)
{
- AllocTempHeader *h =
- (AllocTempHeader *)malloc(n + sizeof(AllocTempHeader));
+ size_t totsize = n + sizeof(AllocTempHeader);
+
+ AllocTempHeader *h = (AllocTempHeader *)malloc(totsize);
+
+ // Lot of the code assume the memory is set to 0
+ memset(h, 0, totsize);
+
h->prev = NULL;
h->next = Head;
Head = h;