For debugging reasons I have installed fpc 2.6.4 on Debian so I can compile some old SVN revisions, number 32959 for example.

I want to use the fp editor to run the test, but it seems as the "systemic" 2.6.4 is being used for compiling instead of the SVN version. The bug doesn't show up in 2.6.4, only in some 2.7.1 revisions and later. How can I make sure the SVN version is used and not the systems 2.6.4?

The following paths was added to fp editor in Options->Units:

/home/roger/fpc/fpc_svn/lib/fpc/2.7.1/unitsx86_64-linux /home/roger/fpc/fpc_svn/lib/fpc/2.7.1/unitsx86_64-linux/* /home/roger/fpc/fpc_svn/lib/fpc/2.7.1/unitsx86_64-linux/rtl

Also, both the directories of fpc and ppcx64 was added to the path from commandline:

PATH=home/roger/fpc/fpc_svn/bin:/home/roger/fpc/fpc_svn/compiler:/usr/local/bin:/usr/bin:/bin export
PATH=home/roger/fpc/fpc_svn/bin:/home/roger/fpc/fpc_svn/compiler:/usr/local/bin:/usr/bin:/bin

Despite the path, if I run "which fpc" from commandline I get "usr/bin/fpc" anyway. How is that possible when that fpc is not in the path?

I meant to say that system fpc is put AFTER the SVN fpc in the path.

In our previous episode, kapibara via fpc-pascal said:

I want to use the fp editor to run the test, but it seems as the "systemic" 2.6.4 is being used for compiling instead of the SVN version.

Then you use a 2.6.4 FP. FP does not call the compiler, it has an own version of it internally.

kapibara wrote

I meant to say that system fpc is put AFTER the SVN fpc in the path.

Due to the missing slash at the beginning of the PATH value? ;-) Obviously, that only answers the reason of the 'which fpc' command, whereas the compiler version used when compiling from the IDE has already been answered by Marco

Tomas

Ah, so FP has no versions other than the official releases then? (2.6.0, 2.6.2, 2.6.4 and so on)

Why doesn't FP use the same compiler revision as the SVN sources it comes with? Because the fp executable is compiled at the same time as fpc?

Alright then, I'll try instead:

fpc test.pas

Btw, why have fpc and also ppcx64? Does fpc call ppcx64?

It uses the sources from which it has been compiled (the same way fpc does too). Fp is a separate make target. It may be part of a snapshot, and it may be compiled from SVN sources by you as well (it has some additional prerequisites if you want to have the debugger integrated, and it requires some additional FPC packages compiled first, but nothing special apart from that).

Yes - or another compiler binary if (cross-)compiling for a different CPU/platform (e.g. ppc386, ppcarm, ppcjvm, etc.).

Tomas

You're right, now I fixed that and "which fpc" reports the SVN version!

The old SVN version is now in play, so far so good! But then "Can't find unit system" happened:

fpc fptest.pas
Free Pascal Compiler version 3.1.1 [2017/08/16] for x86_64 Copyright (c) 1993-2015 by Florian Klaempfl and others Target OS: Linux for x86-64
Compiling fptest.pas
Fatal: Can't find unit system used by fptest
Fatal: Compilation aborted
Error: /home/roger/fpc/fpc_svn/compiler/ppcx64 returned an error exitcode

Before that I had changed the path:

PATH=/home/roger/fpc/fpc_svn/bin:/home/roger/fpc/fpc_svn/compiler:/usr/local/bin:/usr/bin:/bin export
PATH=/home/roger/fpc/fpc_svn/bin:/home/roger/fpc/fpc_svn/compiler:/usr/local/bin:/usr/bin:/bin

which fpc
/home/roger/fpc/fpc_svn/bin/fpc

kapibara wrote

The old SVN version is now in play, so far so good! But then "Can't find unit system" happened:

You need RTL (and other required units, e.g. from packages) compiled with that compiler version and provide path to it either using fpc.cfg, or -Fu command line parameter(s). Parameter -vt shows the path used by the compiler when trying to find the appropriate version of a compiled unit.

Tomas

To be sure fpc.cfg is found I started the compilation from fpc's bin directory where the fpc.cfg is located.

bin$ ./fpc /home/roger/fpc/fptest_working/fptest.pas Free Pascal Compiler version 3.1.1 [2017/08/16] for x86_64 Copyright (c) 1993-2015 by Florian Klaempfl and others Target OS: Linux for x86-64
Compiling /home/roger/fpc/fptest_working/fptest.pas Fatal: Can't find unit system used by fptest
Fatal: Compilation aborted
Error: /home/roger/fpc/fpc_svn/compiler/ppcx64 returned an error exitcode

Here is the fpc.cfg

#
# Config file generated by fpcmkcfg on 16-8-17 - 21:46:51 # Example fpc.cfg for Free Pascal Compiler
#

# ----------------------
# Defines (preprocessor)
# ----------------------

#
# nested #IFNDEF, #IFDEF, #ENDIF, #ELSE, #DEFINE, #UNDEF are allowed #
# -d is the same as #DEFINE
# -u is the same as #UNDEF
#

#
# Some examples (for switches see below, and the -? helppages) #
# Try compiling with the -dRELEASE or -dDEBUG on the commandline #

# For a release compile with optimizes and strip debuginfo #IFDEF RELEASE
-O2
-Xs
#WRITE Compiling Release Version
#ENDIF

# For a debug version compile with debuginfo and all codegeneration checks on
#IFDEF DEBUG
-gl
-Crtoi
#WRITE Compiling Debug Version
#ENDIF

# assembling
#ifdef darwin
# use pipes instead of temporary files for assembling -ap
# path to Xcode 4.3+ utilities (no problem if it doesn't exist) -FD/Applications/Xcode.app/
Contents/Developer/usr/bin
#endif

# ----------------
# Parsing switches
# ----------------

# Pascal language mode
# -Mfpc free pascal dialect (default)
# -Mobjfpc switch some Delphi 2 extensions on # -Mdelphi tries to be Delphi compatible
# -Mtp tries to be TP/BP 7.0 compatible # -Mgpc tries to be gpc compatible
# -Mmacpas tries to be compatible to the macintosh pascal dialects #
# Turn on Object Pascal extensions by default
#-Mobjfpc

# Assembler reader mode
# -Rdefault use default assembler
# -Ratt read AT&T style assembler
# -Rintel read Intel style assembler
#
# All assembler blocks are AT&T styled by default
#-Ratt

# Semantic checking
# -S2 same as -Mobjfpc
# -Sc supports operators like C (*=,+=,/= and -=) # -Sa include assertion code.
# -Sd same as -Mdelphi
# -Se<x> error options. <x> is a combination of the following: # <n> : compiler stops after <n> errors (default is 1) # w : compiler stops also after warnings # n : compiler stops also after notes
# h : compiler stops also after hints
# -Sg allow LABEL and GOTO
# -Sh Use ansistrings
# -Si support C++ styled INLINE
# -Sk load fpcylix unit
# -SI<x> set interface style to <x>
# -SIcom COM compatible interface (default) # -SIcorba CORBA compatible interface
# -Sm support macros like C (global)
# -So same as -Mtp
# -Sp same as -Mgpc
# -Ss constructor name must be init (destructor must be done) # -Sx enable exception keywords (default in Delphi/ObjFPC modes) #
# Allow goto, inline, C-operators, C-vars
-Sgic

# ---------------
# Code generation
# ---------------

# Uncomment the next line if you always want static/dynamic units by default # (can be overruled with -CD, -CS at the commandline) #-CS
#-CD

# Set the default heapsize to 8Mb
#-Ch8000000

# Set default codegeneration checks (iocheck, overflow, range, stack) #-Ci
#-Co
#-Cr
#-Ct

# Optimizer switches
# -Os generate smaller code
# -Oa=N set alignment to N
# -O1 level 1 optimizations (quick optimizations, debuggable) # -O2 level 2 optimizations (-O1 + optimizations which make debugging more difficult)
# -O3 level 3 optimizations (-O2 + optimizations which also may make the program slower rather than faster)
# -Oo<x> switch on optimalization x. See fpc -i for possible values # -OoNO<x> switch off optimalization x. See fpc -i for possible values # -Op<x> set target cpu for optimizing, see fpc -i for possible values

#ifdef darwin
#ifdef cpui386
-Cppentiumm
-Oppentiumm
#endif
#endif

# -----------------------
# Set Filenames and Paths
# -----------------------

# Both slashes and backslashes are allowed in paths

# path to the messagefile, not necessary anymore but can be used to override # the default language
#-Fr/home/roger/fpc/fpc_svn/msg/errore.msg
#-Fr/home/roger/fpc/fpc_svn/msg/errorn.msg
#-Fr/home/roger/fpc/fpc_svn/msg/errores.msg
#-Fr/home/roger/fpc/fpc_svn/msg/errord.msg
#-Fr/home/roger/fpc/fpc_svn/msg/errorr.msg

# searchpath for units and other system dependent things -Fu/home/roger/fpc/fpc_svn/units/$fpctarget
-Fu/home/roger/fpc/fpc_svn/units/$fpctarget/*
-Fu/home/roger/fpc/fpc_svn/units/$fpctarget/rtl
-Fu/home/roger/fpc/pascalscript/Source

#IFDEF FPCAPACHE_1_3
-Fu/home/roger/fpc/fpc_svn/units/$fpctarget/httpd13/ #ELSE
#IFDEF FPCAPACHE_2_0
-Fu/home/roger/fpc/fpc_svn/units/$fpctarget/httpd20 #ELSE
-Fu/home/roger/fpc/fpc_svn/units/$fpctarget/httpd22 #ENDIF
#ENDIF

# searchpath for fppkg user-specific packages
-Fu~/.fppkg/lib/fpc/$fpcversion/units/$FPCTARGET/*

# path to the gcclib
#ifdef cpui386
-Fl/usr/lib/gcc/x86_64-linux-gnu/6
#endif
#ifdef cpux86_64
-Fl/usr/lib/gcc/x86_64-linux-gnu/6
#endif

# searchpath for libraries
#-Fl/home/roger/fpc/fpc_svn/lib
#-Fl/lib;/usr/lib
-Fl/home/roger/fpc/fpc_svn/lib/$FPCTARGET

# searchpath for tools
-FD/home/roger/fpc/fpc_svn/bin/$FPCTARGET

#IFNDEF CPUI386
#IFNDEF CPUAMD64
#DEFINE NEEDCROSSBINUTILS
#ENDIF
#ENDIF

#IFNDEF Linux
#DEFINE NEEDCROSSBINUTILS
#ENDIF

# binutils prefix for cross compiling
#IFDEF FPC_CROSSCOMPILING
#IFDEF NEEDCROSSBINUTILS
-XP$FPCTARGET-
#ENDIF
#ENDIF

# -------------
# Linking
# -------------

# generate always debugging information for GDB (slows down the compiling # process)
# -gc generate checks for pointers
# -gd use dbx
# -gg use gsym
# -gh use heap trace unit (for memory leak debugging) # -gl use line info unit to show more info for backtraces # -gv generates programs tracable with valgrind # -gw generate dwarf debugging info
#
# Enable debuginfo and use the line info unit by default #-gl

# always pass an option to the linker
#-k-s

# Always strip debuginfo from the executable
-Xs

# -------------
# Miscellaneous
# -------------

# Write always a nice FPC logo ;)
-l

# Verbosity
# e : Show errors (default) d : Show debug info # w : Show warnings u : Show unit info # n : Show notes t : Show tried/used files # h : Show hints s : Show time stamps # i : Show general info q : Show message numbers # l : Show linenumbers c : Show conditionals # a : Show everything 0 : Show nothing (except errors) # b : Write file names messages r : Rhide/GCC compatibility mode # with full path x : Executable info (Win32 only) # v : write fpcdebug.txt with p : Write tree.log with parse tree # lots of debugging info
#
# Display Info, Warnings and Notes
-viwn
# If you don't want so much verbosity use
#-vw

Alright, its compiling! It was wrong path in fpc.cfg. The DEB installation creates a directory structure under the fpc directory that matches this:

/lib/fpc/3.1.1/units/$fpctarget

Thanks again!

The working fpc.cfg

# Config file generated by fpcmkcfg on 16-8-17 - 23:52:00 # Example fpc.cfg for Free Pascal Compiler
#

# ----------------------
# Defines (preprocessor)
# ----------------------

#
# nested #IFNDEF, #IFDEF, #ENDIF, #ELSE, #DEFINE, #UNDEF are allowed #
# -d is the same as #DEFINE
# -u is the same as #UNDEF
#

#
# Some examples (for switches see below, and the -? helppages) #
# Try compiling with the -dRELEASE or -dDEBUG on the commandline #

# For a release compile with optimizes and strip debuginfo #IFDEF RELEASE
-O2
-Xs
#WRITE Compiling Release Version
#ENDIF

# For a debug version compile with debuginfo and all codegeneration checks on
#IFDEF DEBUG
-gl
-Crtoi
#WRITE Compiling Debug Version
#ENDIF

# assembling
#ifdef darwin
# use pipes instead of temporary files for assembling -ap
# path to Xcode 4.3+ utilities (no problem if it doesn't exist) -FD/Applications/Xcode.app/

Contents/Developer/usr/bin
#endif

# ----------------
# Parsing switches
# ----------------

# Pascal language mode
# -Mfpc free pascal dialect (default)
# -Mobjfpc switch some Delphi 2 extensions on # -Mdelphi tries to be Delphi compatible
# -Mtp tries to be TP/BP 7.0 compatible # -Mgpc tries to be gpc compatible
# -Mmacpas tries to be compatible to the macintosh pascal dialects #
# Turn on Object Pascal extensions by default
#-Mobjfpc

# Assembler reader mode
# -Rdefault use default assembler
# -Ratt read AT&T style assembler
# -Rintel read Intel style assembler
#
# All assembler blocks are AT&T styled by default
#-Ratt

# Semantic checking
# -S2 same as -Mobjfpc
# -Sc supports operators like C (*=,+=,/= and -=) # -Sa include assertion code.
# -Sd same as -Mdelphi
# -Se<x> error options. <x> is a combination of the following: # <n> : compiler stops after <n> errors (default is 1) # w : compiler stops also after warnings # n : compiler stops also after notes
# h : compiler stops also after hints
# -Sg allow LABEL and GOTO
# -Sh Use ansistrings
# -Si support C++ styled INLINE
# -Sk load fpcylix unit
# -SI<x> set interface style to <x>
# -SIcom COM compatible interface (default) # -SIcorba CORBA compatible interface
# -Sm support macros like C (global)
# -So same as -Mtp
# -Sp same as -Mgpc
# -Ss constructor name must be init (destructor must be done) # -Sx enable exception keywords (default in Delphi/ObjFPC modes) #
# Allow goto, inline, C-operators, C-vars
-Sgic

# ---------------
# Code generation
# ---------------

# Uncomment the next line if you always want static/dynamic units by default # (can be overruled with -CD, -CS at the commandline) #-CS
#-CD

# Set the default heapsize to 8Mb
#-Ch8000000

# Set default codegeneration checks (iocheck, overflow, range, stack) #-Ci
#-Co
#-Cr
#-Ct

# Optimizer switches
# -Os generate smaller code
# -Oa=N set alignment to N
# -O1 level 1 optimizations (quick optimizations, debuggable) # -O2 level 2 optimizations (-O1 + optimizations which make debugging more difficult)
# -O3 level 3 optimizations (-O2 + optimizations which also may make the program slower rather than faster)
# -Oo<x> switch on optimalization x. See fpc -i for possible values # -OoNO<x> switch off optimalization x. See fpc -i for possible values # -Op<x> set target cpu for optimizing, see fpc -i for possible values

#ifdef darwin
#ifdef cpui386
-Cppentiumm
-Oppentiumm
#endif
#endif

# -----------------------
# Set Filenames and Paths
# -----------------------

# Both slashes and backslashes are allowed in paths

# path to the messagefile, not necessary anymore but can be used to override # the default language
#-Fr/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/msg/errore.msg #-Fr/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/msg/errorn.msg #-Fr/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/msg/errores.msg #-Fr/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/msg/errord.msg #-Fr/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/msg/errorr.msg

# searchpath for units and other system dependent things -Fu/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/units/$fpctarget -Fu/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/units/$fpctarget/* -Fu/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/units/$fpctarget/rtl -Fu/home/roger/fpc/pascalscript/Source

#IFDEF FPCAPACHE_1_3
-Fu/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/units/$fpctarget/httpd13/ #ELSE
#IFDEF FPCAPACHE_2_0
-Fu/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/units/$fpctarget/httpd20 #ELSE
-Fu/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/units/$fpctarget/httpd22 #ENDIF
#ENDIF

# searchpath for fppkg user-specific packages
-Fu~/.fppkg/lib/fpc/$fpcversion/units/$FPCTARGET/*

# path to the gcclib
#ifdef cpui386
-Fl/usr/lib/gcc/x86_64-linux-gnu/6
#endif
#ifdef cpux86_64
-Fl/usr/lib/gcc/x86_64-linux-gnu/6
#endif

# searchpath for libraries
#-Fl/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/lib
#-Fl/lib;/usr/lib
-Fl/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/lib/$FPCTARGET

# searchpath for tools
-FD/home/roger/fpc/fpc_svn/lib/fpc/3.1.1/bin/$FPCTARGET

#IFNDEF CPUI386
#IFNDEF CPUAMD64
#DEFINE NEEDCROSSBINUTILS
#ENDIF
#ENDIF

#IFNDEF Linux
#DEFINE NEEDCROSSBINUTILS
#ENDIF

# binutils prefix for cross compiling
#IFDEF FPC_CROSSCOMPILING
#IFDEF NEEDCROSSBINUTILS
-XP$FPCTARGET-
#ENDIF
#ENDIF

# -------------
# Linking
# -------------

# generate always debugging information for GDB (slows down the compiling # process)
# -gc generate checks for pointers
# -gd use dbx
# -gg use gsym
# -gh use heap trace unit (for memory leak debugging) # -gl use line info unit to show more info for backtraces # -gv generates programs tracable with valgrind # -gw generate dwarf debugging info
#
# Enable debuginfo and use the line info unit by default #-gl

# always pass an option to the linker
#-k-s

# Always strip debuginfo from the executable
-Xs

# -------------
# Miscellaneous
# -------------

# Write always a nice FPC logo ;)
-l

# Verbosity
# e : Show errors (default) d : Show debug info # w : Show warnings u : Show unit info # n : Show notes t : Show tried/used files # h : Show hints s : Show time stamps # i : Show general info q : Show message numbers # l : Show linenumbers c : Show conditionals # a : Show everything 0 : Show nothing (except errors) # b : Write file names messages r : Rhide/GCC compatibility mode # with full path x : Executable info (Win32 only) # v : write fpcdebug.txt with p : Write tree.log with parse tree # lots of debugging info
#
# Display Info, Warnings and Notes
-viwn
# If you don't want so much verbosity use
#-vw