[Bug 1787723] Re: CMake fails to apply compiler flags during compiler testing

[Launchpad Bug Tracker]

[Expired for cmake (Ubuntu) because there has been no activity for 60
days.]

** Changed in: cmake (Ubuntu)
       Status: Incomplete => Expired

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Title:
  CMake fails to apply compiler flags during compiler testing

Status in cmake package in Ubuntu:
  Expired

Bug description:
  When cross-compiling for a STM32 I've found that no compiler flags are passed during compiler testing on several releases of Ubuntu but I have no issues on Fedora. In both cases build flags are 
  shown in the log but on Ubuntu they are not used... Since it errors out on Ubuntu I have both CMakeOutput.log and CmakeError.log:

  CmakeOutput.log:

  The target system is: Generic - 1 - arm
  The host system is: Linux - 4.15.0-32-generic - x86_64
  Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded.
  Compiler: /usr/bin/arm-none-eabi-gcc
  Build flags: ;-Wall;-std=gnu11;-mlittle-endian;-mthumb;-mthumb-interwork;-nostartfiles;-mcpu=cortex-m4;-fsingle-precision-constant;-Wdouble-promotion;-mfpu=fpv4-sp-d16;-mfloat-abi=hard;-D__FPU_PRESENT=1;-D__FPU_USED=1;--specs=nosys.specs
  Id flags:

  The output was:
  0
  /usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/bin/ld: warning: cannot find entry symbol _start; defaulting to 0000000000008000

  
  Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "a.out"

  The C compiler identification is GNU, found in
  "/home/richard/build/stm32/CMakeFiles/3.10.2/CompilerIdC/a.out"

  
  CmakeError.log:

  Determining if the C compiler works failed with the following output:
  Change Dir: /home/richard/build/stm32/CMakeFiles/CMakeTmp

  Run Build Command:"/usr/bin/make" "cmTC_e5a38/fast"
  /usr/bin/make -f CMakeFiles/cmTC_e5a38.dir/build.make CMakeFiles/cmTC_e5a38.dir/build
  make[1]: Entering directory '/home/richard/build/stm32/CMakeFiles/CMakeTmp'
  Building C object CMakeFiles/cmTC_e5a38.dir/testCCompiler.c.obj
  /usr/bin/arm-none-eabi-gcc    -o CMakeFiles/cmTC_e5a38.dir/testCCompiler.c.obj   -c /home/richard/build/stm32/CMakeFiles/CMakeTmp/testCCompiler.c
  Linking C executable cmTC_e5a38
  /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_e5a38.dir/link.txt --verbose=1
  /usr/bin/arm-none-eabi-gcc      CMakeFiles/cmTC_e5a38.dir/testCCompiler.c.obj  -o cmTC_e5a38
  /usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/lib/libc.a(lib_a-exit.o): In function `exit':
  /build/newlib-8gJlYR/newlib-2.4.0.20160527/build/arm-none-eabi/newlib/libc/stdlib/../../../../../newlib/libc/stdlib/exit.c:70: undefined reference to `_exit'
  collect2: error: ld returned 1 exit status
  CMakeFiles/cmTC_e5a38.dir/build.make:97: recipe for target 'cmTC_e5a38' failed
  make[1]: *** [cmTC_e5a38] Error 1
  make[1]: Leaving directory '/home/richard/build/stm32/CMakeFiles/CMakeTmp'
  Makefile:126: recipe for target 'cmTC_e5a38/fast' failed
  make: *** [cmTC_e5a38/fast] Error 2

  
  On Fedora the build flags are passed to the compiler during compiler testing:

  The target system is: Generic -  - arm
  The host system is: Linux - 4.17.12-200.fc28.x86_64 - x86_64
  Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded.
  Compiler: /usr/lib64/ccache/arm-none-eabi-gcc
  Build flags: ;-Wall;-std=gnu11;-mlittle-endian;-mthumb;-mthumb-interwork;-nostartfiles;-mcpu=cortex-m4;-fsingle-precision-constant;-Wdouble-promotion;-mfpu=fpv4-sp-d16;-mfloat-abi=hard;-D__FPU_PRESENT=1;-D__FPU_USED=1;--specs=nosys.specs
  Id flags:

  The output was:
  0
  /usr/lib/gcc/arm-none-eabi/7.1.0/../../../../arm-none-eabi/bin/ld: warning: cannot find entry symbol _start; defaulting to 0000000000008000

  
  Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "a.out"

  The C compiler identification is GNU, found in
  "/home/build/build/stm32/CMakeFiles/3.11.2/CompilerIdC/a.out"

  Determining if the C compiler works passed with the following output:
  Change Dir: /home/build/build/stm32/CMakeFiles/CMakeTmp

  Run Build Command:"/usr/bin/gmake" "cmTC_e050e/fast"
  /usr/bin/gmake -f CMakeFiles/cmTC_e050e.dir/build.make CMakeFiles/cmTC_e050e.dir/build
  gmake[1]: Entering directory '/home/build/build/stm32/CMakeFiles/CMakeTmp'
  Building C object CMakeFiles/cmTC_e050e.dir/testCCompiler.c.obj
  /usr/lib64/ccache/arm-none-eabi-gcc   -Wall -std=gnu11 -mlittle-endian -mthumb -mthumb-interwork -nostartfiles -mcpu=cortex-m4 -fsingle-precision-constant -Wdouble-promotion -mfpu=fpv4-sp-d16 -mfloat-abi=hard -D__FPU_PRESENT=1 -D__FPU_USED=1 --specs=nosys.specs    -o CMakeFiles/cmTC_e050e.dir/testCCompiler.c.obj   -c /home/build/build/stm32/CMakeFiles/CMakeTmp/testCCompiler.c
  Linking C executable cmTC_e050e
  /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_e050e.dir/link.txt --verbose=1
  /usr/lib64/ccache/arm-none-eabi-gcc  -Wall -std=gnu11 -mlittle-endian -mthumb -mthumb-interwork -nostartfiles -mcpu=cortex-m4 -fsingle-precision-constant -Wdouble-promotion -mfpu=fpv4-sp-d16 -mfloat-abi=hard -D__FPU_PRESENT=1 -D__FPU_USED=1 --specs=nosys.specs     CMakeFiles/cmTC_e050e.dir/testCCompiler.c.obj  -o cmTC_e050e
  /usr/lib/gcc/arm-none-eabi/7.1.0/../../../../arm-none-eabi/bin/ld: warning: cannot find entry symbol _start; defaulting to 0000000000008000
  gmake[1]: Leaving directory '/home/build/build/stm32/CMakeFiles/CMakeTmp'

  
  I have reproduced this on Ubuntu 18 but have reports from other developers on version 14 and 17.

  Cmake version on Ubuntu Bionic: 3.10.2
  on Fedora 28: 3.11.2

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