Package: cmake
Version: 3.31.6-2
Severity: normal
Dear Maintainer,
Let us consider a simple program that use the Subversion libraries. Here is its
CMakeLists.txt, reduced for this bug report:
----
cmake_minimum_required(VERSION 3.28..3.31)
project(svn-umilo VERSION 1.1.3 LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED True)
include(GNUInstallDirs)
find_package(PkgConfig REQUIRED)
# ce pkg_check_modules ressemble beaucoup à la macro des autotools
pkg_check_modules(SVNUMILO REQUIRED libsvn_ra libsvn_repos libsvn_client
libsvn_subr libarchive liblog4cxx)
find_package(Doxygen)
if (${DOXYGEN_FOUND})
find_package(LATEX REQUIRED COMPONENTS PDFLATEX)
configure_file(dox_svn-umilo.conf.cmake-in dox_svn-umilo.conf @ONLY)
endif()
add_executable(svn-umilo svn-umilo.cpp)
target_include_directories(svn-umilo AFTER PRIVATE ${SVNUMILO_INCLUDE_DIRS})
target_link_libraries(svn-umilo ${SVNUMILO_LINK_LIBRARIES})
target_link_directories(svn-umilo PRIVATE ${SVNUMILO_LIBRARY_DIRS})
# ... Other documentation targets cut for this report ...
# Autre documentation :
if (${DOXYGEN_FOUND})
# !!? This command make the application object file disappear in the linker
command line, leaving only the libraries. So the linker rightly protests about
a missing main() symbol.
# add_custom_command(
# OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/dox_svn-umilo.pdf"
# COMMAND doxygen ${CMAKE_CURRENT_BINARY_DIR}/dox_svn-umilo.conf
# COMMAND sh -c 'cd dox_svn-umilo/latex && ${PDFLATEX_COMPILER}
refman.tex'
# COMMAND mv ${CMAKE_CURRENT_BINARY_DIR}/dox_svn-umilo/latex/refman.pdf
${CMAKE_CURRENT_BINARY_DIR}/dox_svn-umilo.pdf
# MAIN_DEPENDENCY ${CMAKE_CURRENT_SOURCE_DIR}/svn-umilo.cpp
# DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/dox_svn-umilo.conf
# WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
# COMMENT "Génération de la documentation Doxygen au format HTML et
LaTeX, et composition du LaTeX en PDF"
# )
add_custom_target(dox_svn-umilo.pdf DEPENDS
${CMAKE_CURRENT_BINARY_DIR}/dox_svn-umilo.pdf)
endif()
----
Let us configure and build this:
cmake -S . -B tmp
make -C tmp VERBOSE=1 svn-umilo
At this point all is fine. Now enable the commented-out add_custom_command()
for Doxygen and rebuild:
make -C tmp VERBOSE=1 svn-umilo
Now the linker fails: "undefined reference to main".
Indeed, wdiff applied to the 2 command lines shows that the application object
file "CMakeFiles/svn-umilo.dir/svn-umilo.cpp.o" is missing in the 2nd run. So
something that processes the add_custom_command() command modifies the build
information of the unrelated target defined by add_program().
This bus also applies to cmake 3.28 as found in Ubuntu 24.04 LTS (Noble).
-- System Information:
Debian Release: 13.4
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 6.12.85+deb13-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages cmake depends on:
ii cmake-data 3.31.6-2
ii libarchive13t64 3.7.4-4
ii libc6 2.41-12+deb13u2
ii libcurl4t64 8.14.1-2+deb13u2
ii libexpat1 2.7.1-2
ii libgcc-s1 14.2.0-19
ii libjsoncpp26 1.9.6-3
ii librhash1 1.4.5-1
ii libstdc++6 14.2.0-19
ii libuv1t64 1.50.0-2
ii procps 2:4.0.4-9
ii zlib1g 1:1.3.dfsg+really1.3.1-1+b1
Versions of packages cmake recommends:
ii gcc 4:14.2.0-1
ii make 4.4.1-2
Versions of packages cmake suggests:
ii cmake-doc 3.31.6-2
pn cmake-format <none>
ii elpa-cmake-mode 4.0.1+ds-1
ii ninja-build 1.12.1-1
-- no debconf information
