[PD] Espeak external compilation/loading errors on Linux

[IOhannes m zmölnig]

On 3/13/21 10:45 PM, Christof Ressi wrote:
>>
> So the actual problem is that Pd can't find the 'espeak' library at 
> runtime. You obviously have it installed, at least gcc can find the 
> header files during compilation.

the *actual* problem is, that one (or more) symbol(s) that are supposed 
to be provided by the libespeak library cannot be resolved.
there's no error indicating that any library cannot be found at runtime.

i just checked the project and after a successfull compilation, it seems 
that the espeak.pd_linux is not linked at all against the libespeak library.

this basically indicates a broken build system.
whenever you happen to meet the author of the makefile, please deliver a 
good slapping from my side.


what is going wrong here, is that modern linkers try aggressively to 
remove unneeded dependencies. and because libespeak is added to the 
linker when nothing yet uses any of its symbols, it is discarded.

putting the linker-flags to pull in the libraries after the object-files 
that require these libraries, fixes the problem:


```
$ git diff Makefile
diff --git a/Makefile b/Makefile
index b3528b2..cd5b0ce 100644
--- a/Makefile
+++ b/Makefile
@@ -63,7 +63,7 @@ TARGETS=$(SOURCES:.c=.$(EXTENSION))
  pd_linux: $(TARGETS)

  LINUXCFLAGS = -DPD -O2 -funroll-loops -fomit-frame-pointer -fPIC \
-    -Wall -W -Wshadow -Wstrict-prototypes -Werror \
+    -Wall -W -Wshadow -Wstrict-prototypes  \
      -Wno-unused -Wno-parentheses -Wno-switch

  LINUXLDFLAGS =  -export-dynamic -shared  -lc -lm -lespeak
@@ -71,7 +71,7 @@ LINUXLDFLAGS =  -export-dynamic -shared  -lc -lm -lespeak
  LINUXINCLUDE =  -I$(PDSRCDIR)

  %.pd_linux: %.c
-       $(CC) $(LINUXLDFLAGS) $(LINUXCFLAGS) $(LINUXINCLUDE) -o 
$*.pd_linux $*.c
+       $(CC) $(LINUXCFLAGS) $(LINUXINCLUDE) -o $*.pd_linux $*.c 
$(LINUXLDFLAGS)
         strip --strip-unneeded $*.pd_linux


```

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