MantisBT - CMake
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IDProjectCategoryView StatusDate SubmittedLast Update
0014792CMake(No Category)public2014-03-07 03:282016-06-10 14:31
ReporterMathieu Malaterre 
Assigned ToKitware Robot 
PrioritynormalSeverityfeatureReproducibilityhave not tried
StatusclosedResolutionmoved 
PlatformOSOS Version
Product VersionCMake 2.8.11.1 
Target VersionFixed in Version 
Summary0014792: Teach CMakeDetermineCompilerABI to handle TinyCC
DescriptionSteps:

$ cat ../CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
project(tcc C)
find_package(ZLIB REQUIRED)
$ export CC=/usr/bin/tcc
$ cmake ..
-- The C compiler identification is TinyCC
-- Check for working C compiler: /usr/bin/tcc
-- Check for working C compiler: /usr/bin/tcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:108 (message):
  Could NOT find ZLIB (missing: ZLIB_LIBRARY) (found version "1.2.7")
Call Stack (most recent call first):
  /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:315 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/cmake-2.8/Modules/FindZLIB.cmake:85 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:3 (find_package)


-- Configuring incomplete, errors occurred!


However:
$ rm -rf *
$ unset CC
$ cmake ..
-- The C compiler identification is GNU 4.7.2
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.7")
-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/dd/bin
Steps To Reproduce
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Issue History
Date ModifiedUsernameFieldChange
2014-03-07 03:28Mathieu MalaterreNew Issue
2014-03-07 03:37Mathieu MalaterreNote Added: 0035334
2014-03-07 05:54Rolf Eike BeerNote Added: 0035335
2014-03-07 06:01Mathieu MalaterreNote Added: 0035336
2014-03-07 07:09Philipp MöllerNote Added: 0035337
2014-03-07 07:35Philipp MöllerNote Deleted: 0035337
2014-03-10 05:39Mathieu MalaterreSummaryfind_package behavior affected by tcc => find_package + tcc is not multi-arch capable (cannot search in usr/lib/*/*.so)
2014-03-10 10:26Brad KingNote Added: 0035354
2014-03-10 10:29Mathieu MalaterreNote Added: 0035355
2014-03-10 10:58Brad KingNote Added: 0035359
2014-03-10 11:06Mathieu MalaterreNote Added: 0035362
2014-03-10 11:16Brad KingNote Added: 0035363
2014-03-10 11:20Mathieu MalaterreNote Added: 0035364
2014-03-10 11:26Brad KingNote Added: 0035366
2014-03-10 11:26Brad KingSeverityminor => feature
2014-03-10 11:26Brad KingStatusnew => backlog
2014-03-10 11:26Brad KingSummaryfind_package + tcc is not multi-arch capable (cannot search in usr/lib/*/*.so) => Teach CMakeDetermineCompilerABI to handle TinyCC
2014-03-10 11:27Brad KingNote Added: 0035367
2014-03-10 12:08Mathieu MalaterreNote Added: 0035373
2014-03-11 09:17Mathieu MalaterreNote Added: 0035383
2016-06-10 14:29Kitware RobotNote Added: 0042502
2016-06-10 14:29Kitware RobotStatusbacklog => resolved
2016-06-10 14:29Kitware RobotResolutionopen => moved
2016-06-10 14:29Kitware RobotAssigned To => Kitware Robot
2016-06-10 14:31Kitware RobotStatusresolved => closed

Notes
(0035334)
Mathieu Malaterre   
2014-03-07 03:37   
Reduced test case:

$ cat CMakeLists.txt
project(foobar C)
find_library(ZLIB_LIBRARY z)

So my guess is that:
- project(... C) with TinyCC set, never loads the GNU*.cmake stuff
- if GNU stuff is not loaded, multi-arch paths are not appended to the search paths

Comments ?
(0035335)
Rolf Eike Beer   
2014-03-07 05:54   
Wild guess: tcc is a 32 bit compiler, gcc picks up the 64 bit lib, so you maybe don't have a 32 bit zlib around.
(0035336)
Mathieu Malaterre   
2014-03-07 06:01   
$ cat a.c
int main() { return 0; }
$ tcc -o a a.c
$ file a
a: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), not stripped
(0035354)
Brad King   
2014-03-10 10:26   
CMake learns the library architecture triplet from the compiler. If tcc does not know it then CMake will not learn it from that compiler.
(0035355)
Mathieu Malaterre   
2014-03-10 10:29   
Could you please give a little more details on what you mean by "If tcc does not know it".

Steps:

$ tcc -o a a.c -lz
$ ldd a
    linux-vdso.so.1 => (0x00007fff1cf2e000)
    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f7a42a71000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f7a426e7000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f7a42cb0000)
$ cat a.c
int main() { return 0; }


thanks
(0035359)
Brad King   
2014-03-10 10:58   
CMake detects the list of directories implicitly passed by the compiler front-end to the linker. From that it looks for one that matches the library architecture triplet:

 http://cmake.org/gitweb?p=cmake.git;a=blob;f=Modules/CMakeDetermineCompilerABI.cmake;hb=v3.0.0-rc1#l118 [^]

Look at CMakeFiles/CMakeOutput.log to see information about how CMake extracts this information from the compiler output. Compare behavior with gcc and tcc.
(0035362)
Mathieu Malaterre   
2014-03-10 11:06   
For some reason cmake knows how to use '-v' for gcc to find those. For tcc, one need to use '-vv':

$ tcc -o a -vv a.c
tcc version 0.9.26 (x86-64 Linux)
-> /usr/lib/x86_64-linux-gnu/crt1.o
-> /usr/lib/x86_64-linux-gnu/crti.o
-> a.c
-> /usr/lib/x86_64-linux-gnu/libc.so
-> /lib/x86_64-linux-gnu/libc.so.6
-> /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
-> /usr/lib/x86_64-linux-gnu/libc_nonshared.a
-> /lib/x86_64-linux-gnu/libc.so.6
-> /usr/lib/x86_64-linux-gnu/libc_nonshared.a
-> /usr/lib/x86_64-linux-gnu/../tcc/libtcc1.a
-> /usr/lib/x86_64-linux-gnu/crtn.o
<- a
$ cat a.c
int main() { return 0; }
(0035363)
Brad King   
2014-03-10 11:16   
Cool. Try this patch:

diff --git a/Modules/Compiler/TinyCC-C.cmake b/Modules/Compiler/TinyCC-C.cmake
index f7937ac..b79268a 100644
--- a/Modules/Compiler/TinyCC-C.cmake
+++ b/Modules/Compiler/TinyCC-C.cmake
@@ -1,3 +1,4 @@
+set(CMAKE_C_VERBOSE_FLAG "-vv")
 set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-shared")
 
 # no optimization in tcc:
(0035364)
Mathieu Malaterre   
2014-03-10 11:20   
The way it is written, cmake expect to find in the output either ld or collect2 (and or the explicit linker name). In the case of tcc, the so-called verbose output is rather crude:

$ tcc -vv
tcc version 0.9.26 (x86-64 Linux)
install: /usr/lib/x86_64-linux-gnu/../tcc/
crt:
  /usr/lib/x86_64-linux-gnu
libraries:
  /usr/lib/x86_64-linux-gnu
  /lib/x86_64-linux-gnu
  /usr/local/lib/x86_64-linux-gnu
include:
  /usr/local/include
  /usr/local/include/x86_64-linux-gnu
  /usr/include
  /usr/include/x86_64-linux-gnu
  /usr/lib/x86_64-linux-gnu/../tcc/include
elfinterp:
  /lib64/ld-linux-x86-64.so.2
(0035366)
Brad King   
2014-03-10 11:26   
In that case the implicit library search path detection logic will need to be taught to handle TinyCC output.
(0035367)
Brad King   
2014-03-10 11:27   
So TinyCC has no option to print out the command-lines it invokes internally?
(0035373)
Mathieu Malaterre   
2014-03-10 12:08   
Well, I could not find any. I'll update the bug tracker once upstream confirms:
http://lists.nongnu.org/archive/html/tinycc-devel/2014-03/msg00024.html [^]
(0035383)
Mathieu Malaterre   
2014-03-11 09:17   
As explained here:

http://lists.nongnu.org/archive/html/tinycc-devel/2014-03/msg00025.html [^]

tcc is a compiler *and* a linker.
(0042502)
Kitware Robot   
2016-06-10 14:29   
Resolving issue as `moved`.

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